Nuclear Byron Nuclear Generating Station Byron, IL 61010

Docket No: 5-454 5-455 BYRON NUCLER GENERTING STTION UNITS and nnual Radiological Environmental Operating Report January Through 3 December 9 Prepared By Teledyne Brown Engineering Environmental Services Nuclear Byron Nuclear Generating Station Byron, IL 6 May of 7

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Table Of Contents I. Sum m ary and Conclusions... 5 II. Introduction... 7. O bjectives of the REM P... 7 B. Im plem entation of the O bjectives... 7 Ill. Program Description... 7. Sam ple Collection... 7 B. Sam ple nalysis... C. Data Interpretation... D. Program Exceptions... E. Program Changes... 3 IV. Results and Discussion... 3. quatic Environm ent... 3. Surface W ater... 3. G round W ater... 4 3. Fish... 5 4. Sedim ent... 5 B. tm ospheric Environm ent... 5. irborne... 5 a. ir Particulates... 5 b. irborne Iodine... 6. Terrestrial... 6 a. M ilk... 6 b. Vegetation... 7 C. m bient Gam m a Radiation... 7 D. Land Use Survey... 7 E. Errata Data... 8 F. Summary of Results - Inter-laboratory Comparison Program... 9 3 of 7

ppendices ppendix Tables Table - Radiological Environmental Monitoring Report Summary Radiological Environmental Monitoring Program Summary for Byron Nuclear Generating Station, 9 ppendix B Tables Table B-i: Table B-: Figures Figure B-: Figure B-: Figure B-3: Figure B-4: Location Designation, Distance & Direction, and Sample Collection & nalytical Methods Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 9 Radiological Environmental Monitoring Program - Summary of Sample Collection and nalytical Methods, Byron Nuclear Generating Station, 9 Inner and Outer Ring TLD Locations of the Byron Nuclear Generating Station, 9 Onsite ir Sampling Locations of the Byron Nuclear Generating Station, 9 Offsite ir Sampling Locations of the Byron Nuclear Generating Station, 9 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 9 ppendix C Tables Table C-. Table C-. Table C-.3 Data Tables and Figures - Primary Laboratory Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. -- 4 of 7

Table C-II. Table C-II. Table C-. Table C-IV. Table C-V. Table C-V. Table C-V.3 Table C-VI. Table C-VII. Table C-VII. Table C-VIII. Table C-IX. Table C-IX. Table C-IX.3 Figures Figure C-i Figure - Figure C-3 Figure C-4 Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Gross Beta in ir Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Monthly and Yearly Mean Values of Gross Beta Concentrations in ir Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Gamma Emitters in ir Particulate Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of -3 in ir Iodine Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of -.3 in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Gamma Emitters in Vegetation Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Quarterly TLD Results for Byron Nuclear Generating Station, 9. Mean Quarterly TLD Results for the Inner Ring, Outer Ring, Other and Control Locations for Byron Nuclear Generating Station, 9. Summary of the mbient Dosimetry Program for Byron Nuclear Generating Station, 9. Surface Water - Gross Beta - Stations BY- and BY-9 (C) Collected in the Vicinity of BNGS, - 9. Surface Water - Tritium - Stations BY- and BY-9 (C) Collected in the Vicinity of BNGS, - 9. Ground Water - Tritium - Stations BY-4- and BY-8 Collected in the Vicinity of BNGS, - 9. Ground Water - Tritium - Station BY-3 Collected in the Vicinity of BNGS, - 9. -3-5 of 7

Figure C-5 Figure C-6 Figure C-7 Figure C-8 Figure C-9 Figure C- Figure C-i ppendix D Tables Table D- Table D- Table D-3 Ground Water - Tritium - Station BY-35 and BY-36 Collected in the Vicinity of BNGS, 6-9. Ground Water - Tritium - Station BY-37 Collected in the Vicinity of BNGS, 6-9. ir Particulate - Gross Beta - Stations BY-8 (C) and BY- Collected in the Vicinity of BNGS, - 9. ir Particulate - Gross Beta - Stations BY- and BY-3 Collected in the Vicinity of BNGS, - 9. ir Particulate - Gross Beta - Station BY-4 Collected in the Vicinity of BNGS, - 9. ir Particulate - Gross Beta - Station BY- and BY-4 Collected in the Vicinity of BNGS, 5-9. ir Particulate - Gross Beta - Station BY-6 Collected in the Vicinity of BNGS, 5-9. Inter-Laboratory Comparison Program nalytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 9 ER Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 9 DOE's Mixed nalyte Performance Evaluation Program (MPEP) Teledyne Brown Engineering, 9 ppendix E Effluent Report ppendix E- Data Tables and Figures ppendix F Meteorological Data ppendix G nnual Radiological Groundwater Protection Program Report (RGPPR) -4-6 of 7

. Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the Byron Nuclear Generating Station (BNGS) by Exelon covers the period January 9 through 3 December 9. During that time period,,465 analyses were performed on,3 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of BNGS had no adverse radiological impact on the environment. Surface water samples were analyzed for concentrations of gross beta, tritium and gamma emitting nuclides. Ground water samples were analyzed for concentrations of tritium and gamma emitting nuclides. Gross beta activities detected were consistent with those detected in previous years. Fish (commercially and/or recreationally important species) and sediment samples were analyzed for concentrations of gamma emitting nuclides. Nonplant produced Cesium- 37 activity was found at both sediment locations and was consistent with data from previous years. No plant produced fission or activation products were found in fish or sediment. ir particulate samples were analyzed for concentrations of gross beta and gamma emitting nuclides. No fission or activation products were detected. High sensitivity -3 analyses were performed on weekly air samples. ll results were less than the minimum detectable activity. Cow milk samples were analyzed for concentrations of -3 and gamma emitting nuclides. ll -3 results were below the minimum detectable activity. No fission or activation products were found. Food Product samples were analyzed for concentrations of gamma emitting nuclides. No fission or activation products were detected. Environmental gamma radiation measurements were performed quarterly using thermoluminescent dosimeters. Levels detected were consistent with those observed in previous years. -5-7 of 7

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II. Introduction Byron Station, a two-unit PWR station, is located about two miles east-of the Rock River and approximately three miles southwest of Byron in Ogle County, Illinois. The reactors are designed to have capacities of 8 and 54 MW gross, respectively. Unit One loaded fuel in November 984 and went on line February, 985. Unit Two went on line January 9, 987. The station has been designed to keep releases to the environment at levels below those specified in the codes of federal regulations. This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Global Dosimetry on samples collected during the period January 9 through 3 December 9.. Objective of the REMP The objectives of the REMP are to:. Provide data on measurable levels of radiation and radioactive materials in the site environs.. Evaluate the relationship between quantities of radioactive material released from the plant and resultant radiation doses to individuals from principal pathways of exposure. B. Implementation of the Objectives The implementation of the objectives is accomplished by:. Identifying significant exposure pathways.. Establishing baseline radiological data of media within those pathways. 3. Continuously monitoring those media before and during Station operation to assess Station radiological effects (if any) on man and the environment. Ill. Program Description. Sample Collection Samples for the BNGS, REMP were collected for Exelon Nuclear by Environmental Inc. (Midwest Labs). This section describes the general -7-9 of 7

collection methods used by Environmental Inc. to obtain environmental samples for the BNGS REMP in 9. Sample locations and descriptions can be found in Table B- and Figures B- through B-4, ppendix B. quatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, well water, fish, and sediment. Two gallon water samples were collected weekly from two surface water locations (BY- and BY-9 [Control location]) and quarterly from six well water locations (BY-4-, BY-8, BY-3, BY-35, BY-36 and BY-37). ll samples were collected in new unused plastic bottles, which were rinsed with source water prior to collection. Fish samples comprising the flesh of freshwater drum, river carpsucker, shorthead redhorse and common carp were collected semiannually at two locations, BY-9 (control) and BY-3. Sediment samples composed of recently deposited substrate were collected at two locations semiannually, BY- and BY-34. tmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, airborne iodine, and milk. irborne iodine and particulate samples were collected and analyzed weekly at eight locations (BY-, BY-4, BY-6, BY-8, BY-, BY-, BY-3, and BY-4). The control location was BY-8. irborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The air filters and air iodine samples were replaced weekly and sent to the laboratory for analysis. Milk samples were collected biweekly at three locations (BY--, BY-6- and BY-3-) from May through October, and monthly from November through pril. The control location was BY-6-. ll samples were collected in new unused two gallon plastic bottles from the bulk tank at each location, preserved with sodium bisulfite, and shipped promptly to the laboratory. Food products were collected annually in September at five locations (BY-Control, BY-Quad, BY-Quad, BY-Quad 3, and BY-Quad 4). Various types of samples were collected and placed in new unused plastic bags, and sent to the laboratory for analysis. -8- of 7

mbient Gamma Radiation Direct radiation measurements were made using CaF thermoluminescent dosimeters (TLD). The TLD locations were placed on and around the BNGS site as follows: n inner ring consisting of 6 locations (BY-, BY-, BY-3, BY- 4, BY-5, BY-6, BY-7, BY-8, BY-9, BY-, BY-, BY-, BY-3, BY-4, BY-5, and BY-6) near and within the site perimeter representing fence post doses (i.e., at locations where the doses will be potentially greater than maximum annual off-site doses) from BNGS release. n outer ring consisting of 6 locations (BY-, BY-, BY-3, BY-4, BY-5, BY-6, BY-7, BY-8, BY-9, BY-, BY-, BY-, BY-3, BY-4, BY-5 and BY-6) extending to approximately 5 miles from the site designed to measure possible exposures to close-in population. special interest set consisting of seven locations (BY-3 -, BY-3-, BY-39-, BY-39-, BY39-3, BY-39-4 and BY-34-) to measure possible exposures from on-site storage facilities. n other set consisting of seven locations (BY-, BY-4, BY-6, BY-, BY-, BY-3 and BY-4) at locations where air samplers are present. The balance of one location (BY-8) representing the control area. The specific TLD locations were determined by the following criteria:. The presence of relatively dense population;. Site meteorological data taking into account distance and elevation for each of the sixteen- / degree sectors around the site, where estimated annual dose from BNGS, if any, would be most significant; 3. On hills free from local obstructions and within sight of the vents (where practical); 4. nd near the closest dwelling to the vents in the prevailing downwind direction. Two TLDs - each comprised of two CaF thermoluminescent phosphors enclosed in plastic - were placed at each location located at a minimum of -9- of 7

five feet above ground level. The TLDs were exchanged quarterly and sent to Global Dosimetry for analysis. B. Sample nalysis This section describes the general analytical methodologies used by TBE and Environmental Inc. (Midwest Labs) to analyze the environmental samples for radioactivity for the BNGS REMP in 9. The analytical procedures used by the laboratories are listed in Table B-. In order to achieve the stated objectives, the current program includes the following analyses:. Concentrations of beta emitters in surface water and air particulates.. Concentrations of gamma emitters in ground and surface water, air particulates, milk, fish, sediment and vegetation. 3. Concentrations of tritium in ground and surface water. 4. Concentrations of -3 in air and milk. 5. mbient gamma radiation levels at various site environs. C. Data Interpretation The radiological and direct radiation data collected prior to Byron Nuclear Generating Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Byron Nuclear Generating Station was considered operational at initial criticality. In addition, data were compared to previous years' operational data for consistency and trending. Several factors were important in the interpretation of the data:. Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) was defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 5% probability of falsely concluding that a blank observation represents a "real" signal. The LLD was intended as a before-thefact estimate of a system (including instrumentation, procedure and sample type) and not as an after-the-fact criteria for the presence of activity. ll analyses were designed to achieve the required BNGS -- of 7

detection capabilities for environmental sample analysis. The minimum detectable concentration (MDC) is defined above with the exception that the measurement is an after-the-fact estimate of the presence of activity.. Net ctivity Calculation and Reportinq of Results Net activity for a sample was calculated by subtracting background activity from the sample activity. Since the REMP measures extremely small changes in radioactivity in the environment, background variations may result in sample activity being lower than the background activity effecting a negative number. n MDC was reported in all cases where positive activity was not detected. Gamma spectroscopy results for each type of sample were grouped as follows: For surface water, ground water, milk and vegetation twelve nuclides, Mn-54, Co-58, Fe-59, Co-6, Zn-65, Nb-95, Zr-95, I- 3, Cs-34, Cs-37, Ba-4, and La-4 were reported. For fish, sediment, air particulate and milk eleven nuclides, Mn-54, Co-58, Fe-59, Co-6, Zn-65, Nb-95, Zr-95, Cs-34, Cs-37, Ba-4 and La-4 were reported. Means and standard deviations of the results were calculated. The standard deviations represent the variability of measured results for different samples rather than single analysis uncertainty. D. Program Exceptions For 9 the BNGS REMP had a sample recovery rate in excess of 99%. Sample anomalies and missed samples are listed in the tables below: Table D- LISTING OF SMPLE NOMLIES Sample Location Collection Reason Type Code Date TLD BY-5-3/3/9 The first quarter of 9 TLD result was greater BY--4 than 3 sigma /I BY- 5/5/9 No power to air sampler due to raccoon/transformer damage; power restored on 5/6/9 -i- 3 of 7

Table D- LISTING OF SMPLE NOMLIES (cont'd) Sample Location Collection Reason Type Code Date /I BY- 5//9 Low timer reading due to power outage in previous week ll BY-6 6/6/9 Timer not running; estimated time and replaced TLD BY-5-4 6/9/9 TLD found on the ground near pole; remounted /I BY- 7/4/9 Low timer reading due to power outage for line repair SW BY- 9/9/9 The 3rd quarter surface water composite greater than the LLD likely due to BR6 outage liquid releases. M BY-6- /3/9 False positive -3 result due to interfering nuclide; recount showed increased -3 instead of expected decrease due to decay /I BY-6 /8/9 Timer would not reset; replaced ll BY-4 /9/9 Low timer reading likely due to power outage BY- from snowstorm BY-3 BY-4 Table D- LISTING OF MISSED SMPLES Sample Location Collection Reason Type Code Date SW BY-9 /6/9 No sample; ice on river SW BY- //9 No sample; ice on river BY-9 SW BY- //9 No sample; ice on river BY-9 SW BY- /7/9 No sample; ice on river BY-9 SW BY- /3/9 No sample; ice on river BY-9 TLD BY-- 6/9/9 Pole was moved due to construction in area; new location for TLD replacement -- 4 of 7

Table D- LISTING OF MISSED SMPLES (cont'd) Sample Location Collection Reason Type Code Date SS BY- /7/9 Unable to obtain sediment sample due to high BY-34 river level; sample obtained on //9 SW BY- /5/9 No sample; ice on river BY-9 SW BY- //9 No sample; ice on river BY-9 SW BY- /9/9 No sample; ice on river BY-9 Each program exception was reviewed to understand the causes of the program exception. Sampling and maintenance errors were reviewed with the personnel involved to prevent recurrence. Occasional equipment breakdowns and power outages were unavoidable. The overall sample recovery rate indicates that the appropriate procedures and equipment are in place to assure reliable program implementation. E. Program Changes TLD station BY-39- was added to the sampling program on December 3, 9. TLD station BY-39- was added to the sampling program on December 3, 9. TLD station BY-39-3 was added to the sampling program on December 3, 9. TLD station BY-39-4 was added to the sampling program on December 3, 9. IV. Results and Discussion. quatic Environment. Surface Water Samples were taken weekly and composited monthly at two -3-5 of 7

locations (BY- and BY-9). Of these locations only BY- located downstream, could be affected by Byron Nuclear Generating Station's effluent releases. The following analyses were performed. Gross Beta Samples from both locations were analyzed for concentrations of gross beta (Table C-., ppendix C). The values ranged from 3.4 to 8.8 pci/l. Concentrations detected were consistent with those detected in previous years (Figure C-, ppendix C). Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-., ppendix C). Tritium was detected in one sample at a concentration of 79 pci/l. (Figure C-, ppendix C). Gamma Spectrometry Samples from both locations were analyzed for gamma emitting nuclides (Table C-.3, ppendix C). No nuclides were detected, and all required LLDs were met.. Ground Water Quarterly grab samples were collected at six locations (BY-4-, BY-8, BY-3, BY-35, BY-36 and BY-37). These locations could be affected by Byron Nuclear Generating Station's effluent releases. The following analyses were performed: Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-., ppendix C). No tritium was detected, and the required LLD was met (Figures C-3 through C-6, ppendix C). Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides (Table C-I. ppendix C). No nuclides were detected, and all required LLDs were met. -4-6 of 7

3. Fish Fish samples comprised of common carp, freshwater drum, river carpsucker, shorthead redhorse were collected at two locations (BY-9 and BY-3) semiannually. Location BY-3 could be affected by Byron Nuclear Generating Station's effluent releases. The following analysis was performed: Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma emitting nuclides (Table C-I., ppendix C). No nuclides were detected, and all required LLDs were met. 4. Sediment quatic sediment samples were collected at two locations (BY- and BY-34) semiannually. BY-, located downstream, could be affected by Byron Nuclear Generating Station's effluent releases. The following analysis was performed: Gamma Spectrometry Sediment samples from both locations were analyzed for gamma emitting nuclides (Table C-IV., ppendix C). Cesium-37 was detected in both locations. The values ranged from 3 to 36 pci/kg dry. Concentrations detected were consistent with those detected in previous years and are not a result of plant effluents. No other nuclides were detected, and all required LLDs were met. B. tmospheric Environment. irborne a. ir Particulates Continuous air particulate samples were collected from eight locations on a weekly basis. The eight locations were separated into three groups: Nearsite samplers (BY-, BY-, BY-3 and BY-4), Far Field samplers within 4 km of the site (BY-, BY-4, and BY-6) and the Control sampler between and 3 km from the site (BY-8). The following analyses were performed: -5-7 of 7

Gross Beta Weekly samples were analyzed for concentrations of beta emitters (Table C-V. and C-V., ppendix C). Detectable gross beta activity was observed at all locations. Comparison of results among the three groups aid in determining the effects, if any, resulting from the operation of BNGS. The results from the' Nearsite locations (Group I) ranged from 7 to 4 E-3 pci/m 3 with a mean of E-3 pci/m 3. The results from the Far Field locations (Group II) ranged from 6 to 4 E-3 pci/m 3 with a mean of E-3 pci/m 3. The results from the Control location (Group Ill) ranged from 8 to 46 E-3 pci/m 3 with a mean of E-3 pci/m 3. Comparison of the 9 air particulate data with previous years data indicate no effects from the operation of BNGS. In addition a comparison of the weekly mean values for 9 indicate no notable differences among the three groups (Figures C-7 through C-, ppendix C). Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma emitting nuclides (Table C-V.3, ppendix C). No nuclides were detected, and all required LLDs were met. b. irborne Iodine. Terrestrial a. Milk Continuous air samples were collected from eight locations (BY-, BY-4, BY-6, BY-8, BY-, BY-, BY-3, and BY-4) and analyzed weekly for -3 (Table C-VI., ppendix C). No -3 was detected and the required LLD was met. Samples were collected from three locations (BY--, BY-6-, and BY-3-) biweekly May through October and monthly November through pril. The following analyses were performed: Iodine-3 Milk samples from all locations were analyzed for -6-8 of 7

concentrations of -3 (Table C-VII., ppendix C). No nuclides were detected, and all required LLDs were met. Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma emitting nuclides (Table C-VII., ppendix C). No nuclides were detected, and all required LLDs were met. b. Vegetation Vegetation samples were collected at five locations (BY- Control, BY-Quad, BY-Quad, BY-Quad 3 and BY-Quad 4) when available. Four locations (BY-Quad, BY-Quad, BY-Quad 3 and BY-Quad 4) could be affected by Byron Nuclear Generating Station's effluent releases. The following analysis was performed: Gamma Spectrometry C. mbient Gamma Radiation Samples from all locations were analyzed for gamma emitting nuclides (Table C-VIII., ppendix C). No nuclides were detected, and all required LLDs were met. mbient gamma radiation levels were measured utilizing Panasonic 84 (CaF ) thermoluminescent dosimeters. Ninety-one TLD locations were established around the site. Results of TLD measurements are listed in Tables C-IX. to C-IX.3, ppendix C. Most TLD measurements were below 3 mr/standard quarter, with a range of 7 to 34 mr/standard quarter. comparison of the Inner Ring, Outer Ring, Special Interest, Other and Control Location data indicate that the ambient gamma radiation levels were comparable among the groups. D. Land Use Survey Land Use Survey conducted during ugust 9 around the Byron Nuclear Generating Station (BNGS) was performed by Environmental Inc. (Midwest Labs) for Exelon Nuclear to comply with the Byron Nuclear Generating Station's Offsite Dose Calculation Manual. The purpose of the survey was to document the nearest resident, livestock, and milk producing animals in each of the sixteen / degree sectors and garden -7-9 of 7

of greater than 5 square feet in each of the four 9 degree quadrants around the site. The results of this survey are summarized below. B C D E F G H J K L M N P Q.R Distance in Miles from the BNGS Vent Residence Livestock Miles Miles N. 5. NNE.6.5 NE. 3. ENE.4 4. E. 3.8 ESE.5.3 SE.7 4.3 SSE.7 3. S.6 3.6 SSW.7.3 SW.8.6 WSW.6.6 W.8 3. WNV\.6 NW.8 5.8 3.7 NNW.9.4 Sector Stacks Milk Farm Miles. 4.5 5. E. Errata Data. The 8 vegetation control sample location distance (BY-Control) in Table B- is incorrectly listed as 6.8 miles. The correct distance for the sample location is. miles.. In 9, an effort was undertaken to verify the accuracy of REMP sample locations. ll REMP sample and census locations were measured via GPS as opposed to historical methods such as printed maps. s a result of using this updated technology, the coordinates for the vent stack release point as listed in the ODCM were found to be inaccurate by approximately 44 feet. The inaccuracy of this measurement affected the sector locations of one air sampler, one sediment sample, two environmental TLDs, and several land use census locations. Based on the different vent stack coordinates, some distances to the vent stack release point for REMP sample points, including nearest residents, are different in 9 than they were in 8. In addition, the sector designations for the following nearest residents also changed: Sector : 8 resident is no longer nearest resident in Sector. New resident identified. -8- of 7

* Sector D: 8 resident is no longer in Sector D. New resident identified. " Sector E: Industrial facility identified in 9 that was not previously identified in 8. Sector G: 8 resident is no longer in Sector G. New resident identified. " Sector L: 8 resident is no longer in Sector L. New resident identified. * Sector P: 8 resident is no longer in Sector P. New resident identified. " Sector Q: 8 resident in Sector P is now the nearest resident in Sector Q. ll REMP sample point distances, census location distances, and directions listed in the 9 REOR reflect the newly acquired GPS data. F. Summary of Results - Inter-Laboratory Comparison Program The primary laboratories analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation and water matrices (ppendix D). The PE samples, supplied by nalytics Inc., Environmental Resource ssociates (ER) and DOE's Mixed nalyte Performance Evaluation Program (MPEP), were evaluated against the following preset acceptance criteria:. nalytics Evaluation Criteria nalytics' evaluation report provides a ratio of laboratory results and nalytics' known value. Since flag values are not assigned by nalytics, TBE-ES evaluates the reported ratios based on internal QC requirements, which are based on the DOE MPEP criteria.. ER Evaluation Criteria ER's evaluation report provides an acceptance range for control and warning limits with associated flag values. ER's acceptance limits are established per the USEP, NELC, state specific PT program requirements or ER's SOP for the Generation of Performance cceptance Limits, as applicable. The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document. -9- of 7

3. DOE Evaluation Criteria MPEP's evaluation report provides an acceptance range with associated flag values. The MPEP defines three levels of performance: cceptable (flag = ""), cceptable with Warning (flag = "W"), and Not cceptable (flag = "N"). Performance is considered acceptable when a mean result for the specified analyte is ± % of the reference value. Performance is acceptable with warning when a mean result falls in the range from ±% to ±3% of the reference value (i.e., % < bias < 3%). If the bias is greater than 3%, the results are deemed not acceptable. For the primary laboratory, 7 out of 8 analytes met the specified acceptance criteria. One sample did not meet the specified acceptance criteria for the following reason:. Teledyne Brown Engineering's nalytics June 9 Zn-65 in P result of 37 pci/l was higher than the known value of pci/l, resulting in a found to known ratio of.36. NCR 9-3 was initiated to investigate this failure. The failure appears to be a result of a slightly high bias on Detector 7. recount on Detector 7 resulted in a Zn-65 result of pci/l. The detector has been tagged outof-service until a recalibration can be performed. Detector 7 is not used for client samples. For the secondary laboratory, Environmental, Inc., eleven out of 4 analytes met the specified acceptance criteria.. Environmental Inc.'s ER pril 9 Cs- 37 in water result of 47.7 pci/l exceeded the lower control limit of 5. pci/l. ll gamma emitters showed a low bias. large plastic burr found on the base of the Marinelli kept the beaker from sitting directly on the detector. Recounting in a different beaker gave an acceptable result of 55.33 ± 4.55 pci/l.. Environmental Inc.'s ER pril 9 H-3 in water result of 89 pci/l exceeded the upper control limit of 3 pci/l. recount of the original vials averaged 3,9 pci/l. Reanalysis results were acceptable at 9,7 pci/l. No cause could be found for the failure. 3. Environmental Inc.'s MPEP January 9 Sr-9 in P result of.93 exceeded the upper control limit of.83. Reanalysis results - - of 7

were acceptable at.54 ±. Bq/filter. No cause could be found for the failure.. 4. Environmental Inc.'s MPEP July 9 Sr-9 in soil result of 3.5 Bq/kg exceeded the lower control limit of 39 Bq/kg. Reanalysis results were acceptable at 363.3 Bq/kg. Incomplete separation of strontium from calcium could result in a higher recovery percentage and consequently lower reported activity. The Inter-Laboratory Comparison Program provides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data. - - 3 of 7

PPENDIX RDIOLOGICL ENVIRONMENTL MONITORING REPORT SUMMRY 4 of 7

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TBLE - RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS SURFCE WTER (PCI/LITER) GR-B 3 4 4.8 (/) (3.4/8.8) 5. (7/) (3.5/7.9) 5. (7/) (3.5/7.9) BY-9 CONTROL BYRON - UPSTREM 3. MILES N OF SITE H-3 8 75 (/4) <LLD 75 (/4) BY- INDICTOR I OREGON POOL OF ROCK RIVER - DOWNSTREM 4.5 MILES SSW OF SITE GMM MN-54 3 5 <LLD <LLD CO-58 5 <LLD <LLD FE-59 3 <LLD <LLD CO-6 5 <LLD <LLD 'k) ",... ZN-65 3 <LLD <LLD * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE -i RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS SURFCE WTER (PCI/LITER) NB-95 5 <LLD <LLD ZR-95 3 <LLD <LLD -3 N <LLD <LLD CS-34 5 <LLD <LLD CS-37 8 <LLD <LLD B-4 6 <LLD <LLD "-- L-4 5 <LLD <LLD * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE - RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS GROUND WTER (PCI/LITER) H-3 4 <LLD N GMM MN-54 4 5 <LLD N CO-58 5 <LLD N FE-59 3 <LLD N CO-6 5 <LLD N ZN-65 3 <LLD N,oc K) NB-95 5 <LLD N * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE - RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS GROUND WTER (PCI/LITER) ZR-95 3 <LLD N -3 N <LLD N CS-34 5 <LLD N CS-37 8 <LLD N B-4 6 <LLD N L- 4 5 <LLD N O ' -3 FISH (PCI/KG WET) GMM MN-54 8 3 <LLD <LLD * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE - RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS FISH (PCI/KG WET) CO-58 3 <LLD <LLD FE-59 6 <LLD <LLD CO-6 3 <LLD <LLD ZN-65 6 <LLD <LLD NB-95 N <LLD <LLD ZR-95 N <LLD <LLD CS-34 3 <LLD <LLD '--. * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE - RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS FISH (PCI/KG WET) CS-37 5 <LLD <LLD B-4 N <LLD <LLD L-4 N <LLD <LLD SEDIMENT (PCI/KG DRY) GMM MN-54 N <LLD N CO-58 N <LLD N FE-59 N <LLD N I'-. CO-6 N <LLD N * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE - RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS SEDIMENT (PCI/KG DRY) ZN-65 N <LLD N NB-95 N <LLD N ZR-95 N <LLD N CS-34 5 <LLD N CS-37 8 86 (4/4) (3/36) N 36 (/) (66/36) BY- INDICTOR OREGON POOL OF ROCK RIVER - DOWNSTREM 4.5 MILES SSW OF SITE B- 4 N <LLD N t-j L-4 N <LLD N * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE - RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS IR PRTICULTE (E-3 PCI/CU.METER) GR-B 46 (363/364) (6/4) (5/5) (8/46) (5/5) (9/4) BY- INDICTOR BYRON NERSITE NORTH.3 MILES N OF SITE I GMM MN-54 3 N <LLD <LLD CO-58 N <LLD <LLD FE-59 N <LLD <LLD CO-6 N <LLD <LLD ZN-65 N <LLD <LLD NB-95 N <LLD <LLD * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE -i RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS IR PRTICULTE (E-3 PCI/CU.METER) ZR-95 N <LLD <LLD CS-34 5 <LLD <LLD CS-37 8 <LLD <LLD B-4 N <LLD <LLD L-4 N <LLD <LLD IR IODINE (E-3 PCI/CU.METER) GMM -3 46 7 <LLD <LLD - MILK (PCI/LITER) -3 57 I <LLD <LLD * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE -i RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS MILK (PCI/LITER) GMM MN-54 57 N <LLD <LLD CO-58 N <LLD <LLD FE-59 N <LLD <LLD CO-6 N <LLD <LLD ZN-65 N <LLD <LLD NB-95 N <LLD <LLD w ~ ZR-95 N <LLD <LLD * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE -i RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS MILK (PCI/LITER) CS-34 5 <LLD <LLD CS-37 8 <LLD <LLD B-4 6 <LLD <LLD L-4 5 <LLD <LLD VEGETTION (PCIUKG WET) GMM MN-54 N <LLD <LLD CO-58 N <LLD <LLD - FE-59 N <LLD <LLD * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE -I RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS VEGETTION (PCI/KG WET) CO-6 N <LLD <LLD ZN-65 N <LLD <LLD NB-95 N <LLD <LLD ZR-95 N <LLD <LLD -3 6 <LLD <LLD CS-34 6 <LLD <LLD -- o' CS-37 8 <LLD <LLD * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

TBLE - RDIOLOGICL ENVIRONMENTL MONITORING PROGRM NNUL SUMMRY FOR BYRON NUCLER GENERTION STTION, 9 Name of Facility: BYRON DOCKET NUMBER: 5-454 & 5-455 Location of Facility: BYRON, IL REPORTING PERIOD: 9 INDICTOR CONTROL LOCTION WITH HIGHEST NNUL MEN (M) LOCTIONS LOCTION MEDIUM OR TYPES OF NUMBER OF REQUIRED MEN (M) MEN (M) MEN (M) STTION # NUMBER OF PTHWY SMPLED NLYSIS NLYSIS LOWER LIMIT (F) (F) (F) NME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RNGE RNGE RNGE DISTNCE ND DIRECTION REPORTED MESUREMENT) (LLD) MESUREMENTS VEGETTION (PCI/KG WET) B-4 N <LLD <LLD L-4 N <LLD <LLD DIRECT RDITION (MILLI-ROENTGEN/QTR.) TLD-QURTERLY 363 N 4.9.6 (355/355) (7/34) (8/8) (8/5) 9. (4/4) (3/34) BY--4 INDICTOR 4.7 MILES WSW w ". * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES FRCTION OF DETECTBLE MESUREMENTS T SPECIFIED LOCTIONS IS INDICTED IN PRENTHESES (F)

Intentionally left blank 39 of 7

PPENDIX B LOCTION DESIGNTION, SMPLE COLLECTION DISTNCE & DIRECTION, ND & NLYTICL METHODS 4 of 7

Intentionally left blank 4 of 7

TBLE B-: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 9 Location Location Description Distance & Direction From Site. Surface Water BY- BY-9 Oregon Pool of Rock River, Downstream Byron, Upstream (control) 4.5 miles SSW 3. miles N B. Ground/Well Water BY-4- BY-8 BY-3 BY-35 BY-36 BY-37 C. Milk BY-- BY-6- BY-3-3 North German Church Road McCoy Farmstead Ron Wolford Well Vancko Well Blanchard Well lexander Well Ron Snodgrass Farm Dennis Herbert (control) Ebert Farm. miles SSE.7 miles SW.8 miles W. miles WNW. miles NW.8 miles WNW 4.7 miles WSW.8 miles N 5. miles NNW D. ir Particulates / ir Iodine BY- BY-4 BY-6 BY-8 BY- BY- BY-3 BY-4 E. Fish BY-9 BY-3 F. Sediment BY- BY-34 G. Vegetation Quadrant Quadrant Quadrant 3 Quadrant 4 Control Byron Paynes Point Oregon Leaf River (control) Byron Nearsite North Byron Nearsite East-Southeast Byron Nearsite South Byron Nearsite Southwest Byron, Upstream (control) Byron, Discharge Oregon Pool of Rock River, Downstream Rock River, Downstream 586 N. Cox Road, Stillman Valley 674 Brick Road Deer Path Rd., Byron 7 Town Line Rd., Leaf River 563 Fair Oak Rd., Davis Junction 3. miles N 5. miles SE 4.7 miles SSW 6.8 miles WNW.3 miles N.4 miles SE.6 miles S.6 miles SW 3. miles N. miles WNW 4.5 miles SSW.6 miles WNW 4.9 miles ENE 4.7 miles SE.9 miles SW 4.5 miles NW.6 miles E H. Environmental Dosimetry - TLD Inner Ring BY-- and - BY-- BY- -.3 miles N.9 miles NNE. miles NNE B-I 4 of 7

TBLE B-: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 9 Location Location Description Distance & Direction From Site BY-3- and - BY-3-3 BY-4- and - BY-4-3 BY- 5- and - BY-6- and - BY-7- and - BY-7-3 BY-8- BY-8- BY-9- and - BY-- and - BY--3 BY--4 BY--3 and -4 BY-3- and - BY-4- and- BY-5- and - BY-6- and - BY- 6-3.7 miles NE.43 miles NE.5 miles ENE.36 miles ENE.3 miles E.4 miles ESE.4 miles SE.47 miles SE.7 miles SSE.6 miles SSE.6 miles S.6 miles SSW.7 miles SW.8 miles SW.8 miles WSW.7 miles W.8 miles WNW. miles NW.4 miles NNW.85 miles NNW Outer Ring BY--3 BY--4 BY-- BY-- BY-3- BY-3- BY-4- BY-4- BY-5- and - BY-6- BY-6- BY-7- BY-7- BY-8- BY-8- BY-9- and -4 BY--3 and -4 BY-- and -4 BY-- and -4 BY-3- BY-3-4 BY-4- BY-4-4 BY-5- BY-5-4 BY-6- BY-6-4.5 miles N 4.4 miles N 5. miles NNE 4.8 miles NNE 4.8 miles NE 4.7 miles NE 4. miles ENE 4. miles ENE 3.8 miles E 4. miles ESE 4.4 miles ESE 4. miles SE 3.6 miles SE 4. miles SSE 3.7 miles SSE 3.7 miles S 3.9 miles SSW 4.9 miles SW 4.7 miles WSW 4.7 miles W 4.6 miles W 4.6 miles WNW 4.9 miles WNW 5.3 miles NW 5. miles NW 4.6 miles NNW 4.8 miles NNW B- 43 of 7

TBLE B-: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 9 Location Location Description Distance & Direction From Site Special Interest BY-3- BY-3- BY-39- BY-39- BY-39-3 BY-39-4 BY-34-. miles N. miles NNE.3 miles S.4 miles S.4 miles S.4 miles S. miles WNW Other BY-- and - BY-4- and - BY-6- and - BY-- and - BY-- and - BY-3- and - BY-4- and - 3. miles N 5. miles SE 4.7 miles SSW.3 miles N.4 miles SE.6 miles S.6 miles SW Control BY-8- and - 6.8 miles WNW B-3 44 of 7

TBLE B-: Radiological Environmental Monitoring Program - Summary of Sample Collection and nalytical Methods, Byron Nuclear Generating Station, 9 Sample nalysis Sampling Method nalytical Procedure Number Medium Surface Water Gamma Spectroscopy Monthly composite from TBE, TBE-7 Gamma emitting radioisotope analysis weekly grab samples. Env. Inc., GS- Determination of gamma emitters by gamma spectroscopy Surface Water Gross Beta Monthly composite from TBE, TBE-8 Gross lpha and/or gross beta activity in weekly grab samples. various matrices Env. Inc., W(DS)- Determination of gross alpha and/or gross beta in water (dissolved solids or total residue) Surface Water Tritium Quarterly composite TBE, TBE- Tritium analysis in drinking water by liquid from weekly grab scintillation samples. Env. Inc., T- Determination of tritium in water (direct method) Ground Water Gamma Spectroscopy Quarterly grab samples. TBE, TBE-7 Gamma emitting radioisotope analysis Env. Inc., GS- Determination of gamma emitters by gamma spectroscopy Ground Water Tritium Quarterly grab samples. TBE, TBE- Tritium analysis in drinking water by liquid scintillation Env. Inc., T- Determination of tritium in water (direct method) Fish Gamma Spectroscopy Semi-annual samples TBE-7 Gamma emitting radioisotope analysis collected via electroshocking or other Env. Inc., GS- Determination of gamma emitters by techniques gamma spectroscopy Sediment Gamma Spectroscopy Semi-annual grab TBE, TBE-7 Gamma emitting radioisotope analysis samples Env. Inc., GS- Determination of gamma emitters by gamma spectroscopy ir Particulates Gross Beta One-week composite of TBE, TBE-8 Gross lpha and/or gross beta activity in continuous air sampling through glass fiber filter paper various matrices Env. Inc., P- Determination of gross alpha and/or gross beta in air particulate filters ir Particulates Gamma Spectroscopy Quarterly composite of TBE, TBE-7 Gamma emitting radioisotope analysis each station Env. Inc., GS- Determination of gamma emitters by gamma spectroscopy ir Iodine Gamma Spectroscopy One-week composite of TBE, TBE-7 Gamma emitting radioisotope analysis continuous air sampling through charcoal filter Env. Inc., -3- Determination of -3 in charcoal canisters by gamma spectroscopy (batch method) Milk -3 Bi-weekly grab sample TBE, TBE- Radioiodine in various matrices when cows are on pasture. Monthly all Env. Inc., -3- Determination of -3 in milk by anion other times exchange Milk Gamma Spectroscopy Bi-weekly grab sample TBE, TBE-7 Gamma emitting radioisotope analysis when cows are on pasture. Monthly all Env. Inc., GS- Determination of gamma emitters by other times gamma spectroscopy Vegetation Gamma Spectroscopy nnual grab samples. TBE, TBE-7 Gamma emitting radioisotope analysis Env. Inc., GS- Determination of gamma emitters by gamma spectroscopy TLD Thermoluminescence Quarterly TLDs Global Dosimetry Dosimetry comprised of two Global Dosimetry CaF elements. B-4 45 of 7

*TwD LOGO=D Figure B- Inner and Outer Ring TLD Locations of the Byron Nuclear Generating Station, 9 B-5 46 of 7

I.RET STTMES OUMC OURVEY 37UfLM VLLEY QUDRNW.Z OR, TOPOGRPII. 75 NNUTES SENJE3 IMT :'a o' i ihil IRSMPLI4 L 'TIO N Figure B- Onsite ir Sampling Locations of the Byron Nuclear Generating Station, 9 B-6 47 of 7

BYRDN LEF muvme hrr. MORM ROOK RIVER a a 4 a MILES 4 H I I a I n!!s;-== * irsany ing L ion * B)onStaikon Figure B-3 Offsite ir Sampling Locations of the Byron Nuclear Generating Station, 9 B-7 48 of 7

LEW S MT I 3~ 4 ULM Q a a M"I * WMIII +WTF* Figure B-4 Ingestion and Waterborne Exposure Pathway Sampling Locations of the Byron Nuclear Generating Station, 9 B-8 49 of 7

PPENDIX C DT TBLES ND FIGURES PRIMRY LBORTORY 5 of 7

Intentionally left blank 5 of 7

TBLE C-I. CONCENTRTIONS OF GROSS BET IN SURFCE WTER SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM COLLECTION PERIOD /6/9 - /6/9 /9 - /4/9 3/3/9-3/3/9 4/7/9-4/8/9 5/5/9-5/5/9 6//9-6/3/9 7/7/9-7/8/9 8/4/9-8/5/9 9//9-9/9/9 /5/9 - /7/9 /3/9 - /4/9 //9 - /8/9 BY- 3.7 ±.3 6. ±.9 8.8 ±. 4.5 ±. 3.9 ±. 5. ±.9 < 3.8 3.4 ±. 5. ±..4 4. ±. 3.8 ±. BY-9 () () 5.6 ±.8 7.9 ±. 5. ±. < 3. 4. ±.7 () () < 3.7 3.5 ±. 5.5 ±. < 3.4 *.9 () 3.7 ±. () MEN 4.8 ± 3.3 5. ± 3. TBLE C-I. CONCENTRTIONS OF TRITIUM IN SURFCE WTER SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM COLLECTION PERIOD /6/9 4/7/9 7/7/9 //9 3/3/9 6/3/9 9/9/9 /8/9 BY- < 64 < 88 75 ± 49 () < 73 BY-9 < 63 < < 85 < 73 MEN 75 * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES () SEE PROGRM EXCEPTIONS SECTION FOR EXPLNTION C- 5 of 7

TBLE C-l.3 CONCENTRTIONS OF GMM EMITTERS IN SURFCE WTER SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM STC COLLECTION PERIOD BY- /6/9 - /6/9 //9 - /4/9 3/3/9-3/3/9 4/7/9-4/8/9 5/5/9-5/5/9 6//9-6/3/9 7/7/9-7/8/9 8/4/9-8/5/9 9//9-9/9/9 /5/9 - /7/9 /3/9 - /4/9 //9 - /8/9 Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95-3 Cs-34 Cs-37 Ba-4 La-4 < 3 <8 < 4 < < 4 < 4 < 3 < 5 <9 < 3 < 4 < 4 < 6 < 6 8 < 6 < 5 < < 4 < 3 < 4 < 8 < 7 < 7 <6 <6 <6 MEN BY-9 /6/9 //9 3/3/9 4/7/9 5/5/9 6//9 7/7/9 8/4/9 9//9 /5/9 /3/9 //9 - /6/9 - /4/9-3/3/9-4/8/9-5/5/9-6/3/9-7/8/9-8/5/9-9/9/9 - /7/9 - /4/9 - /8/9 () <8 < < < 5 < 3 * 3 < 4 <9 < 5 < 3 < 5 < 5 * 6 < 5 < 7 < 9 < 5 < < 3 < 8 < 7 < 9 <6 <7 MEN L-J () SEE PROGRM EXCEPTIONS SECTION FOR EXPLNTION

TBLE C-I. CONCENTRTIONS OF TRITIUM IN GROUND WTER SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM COLLECTION PERIOD BY-4- BY-8 BY-3 BY-35 BY-36 BY-37 //9 4/4/9 7/3/9 /3/9 - //9-4/4/9-7/3/9 - /3/9 < 75 < 39 < 8 < 73 < 77 < 35 < 36 < 67 < 76 < 39 < 33 * 7 < 77 < 3 < 95 < 6 < 79 < 78 < 97 < 7 < 77 < 34 < 93 < 73 MEN C-3 54 of 7

TBLE C-II. CONCENTRTIONS OF GMM EMITTERS IN GROUND WTER SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM STC COLLECTION PERIOD BY-4- //9 - // /9 4/4/9-4/4/ /9 7/3/9-7/3/ /9 /3/9 - /3/ /9 Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95-3 Cs-34 Cs-37 Ba-4 La-4 <8 <9 <6 <7 <8 <6 < <9 < 4 <8 < 6 < < 3 < <9 <7 MEN BY-8 //9 4/4/9 7/3/9 /3/9 //9 4/4/9 7/3/9 /3/9 <9 <9 <6 <8 <9 <6 <7 <7 * < < 4 <8 < 9 < 7 < 35 * 3 <9 MEN BY-3 //9 - //9 4/4/9-4/4/9 7/3/9-7/3/9 /3/9 - /3/9 <7 <9 <8 <8 < 4 <8 < < < 4 <8 < 9 < 4 < 9 < <8 MEN BY-35 //9 - //9 4/4/9-4/4/9 7/3/9-7/3/9 /3/9 - /3/9 <6 < <8 <8 <8 <8 3 4 < 5 8 < 6 < 5 <6 <7 <7 MEN BY-36 //9 - //9 4/4/9-4/4/9 7/3/9-7/3/9 /3/9 - /3/9 MEN * < <7 <9 <6 3 8 7 < 3 < < 5 <9 < < 6 < 33 < 3 <6 < <8

TBLE C-. CONCENTRTIONS OF GMM EMITTERS IN GROUND WTER SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 STC COLLECTION PERIOD BY-37 //9 - //9 < 4/4/9-4/4/9 < 7/3/9-7/3/9 < 4 /3/9 - /3/9 < 4 MEN RESULTS IN UNITS OF PCI/LITER ± SIGM Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95-3 Cs-34 Cs-37 Ba-4 La-4 < < 3 < < < < < <9 <8 3 <7 <8 <7 <7 8 <6 4 8 8 <6 ON,-

TBLE C-I. CONCENTRTIONS OF GMM EMITTERS IN FISH SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/KG WET ± SIGM STC COLLECTION PERIOD Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95 Cs-34 Cs-37 Ba-4 La-4 BY-9 Freshwater Drum Shorthead Redhorse Common Carp Shorthead Redhorse 5/4/9 5/4/9 /4/9 /4/9 < 5 < 54 < 59 < 59 < 7 < 84 < 6 < 66 < 5 < 7 < 44 < 77 < 57 < 48 * 5 * 44 < 7 < 4 < 4 < 4 * 95 * 89 * 79 * 75 * 38 * 4 * 77 * 3 < 48 5 < 48 * 5 < 55 < 48 * 48 * 64 * 49 * 44 < 795 * * 5 * 6 * 54 * 85 MEN BY-3 Common Carp Freshwater Drum Common Carp River Carpsucker 5/4/9 5/4/9 /4/9 /4/9 < 44 * 5 * 5 * 55 * 54 < 88 * 6 * 58 * 6 * 33 * 68 * 85 * 36 * 5 < 4 * 6 < * 4 < 98 * 5 * 76 * 9 * 67 * 63 < * 4 * 8 * 7 34 * 5 * 5 * 63 < 34 < 54 < 53 < 58 * 88 * 49 * 94 * 9 * 839 * 3 * 56 < 8 MEN ~

TBLE C-IV. CONCENTRTIONS OF GMM EMITTERS IN SEDIMENT SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/KG DRY ± SIGM STC COLLECTION PERIOD Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95 Cs- 34 Cs-37 Ba-4 La-4 BY- 5/9/9 //9 < 7 < 3 < < < 96 < 7 < 76 < 86 36 ± 5 < 8 < 94 < 3 < 85 < 94 < 6 < 9 < 75 66 ± 88 < 5 < 3 < 94 < 387 MEN - - - 36 ± 98 BY-34 5/9/9 //9 < 9 < 73 < 4 < 8 < 7 < < 74 < 59 < 33 < 8 < < 3 < 9 58 ± 78 < 3 < 57 < 65 3 ± 6 < 7 < 7 < 98 < 37 MEN - - - 36 ± 64 ('- * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES

TBLE C-V. CONCENTRTIONS OF GROSS BET IN IR PRTICULTE SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF E-3 PCI/CU METER ± SIGM COLLECTION PERIOD /3/8 /6/9 //9 //9 /7/9 /3/9 //9 /7/9 /4/9 3/3/9 3//9 3/6/9 3/3/9 3/3/9 4/7/9 4/4/9 4//9 4/8/9 5/5/9 5//9 5/9/9 5/5/9 6//9 6/9/9 6/6/9 6/3/9 6/3/9 7/7/9 7/4/9 7//9 7/8/9 8/4/9 8//9 8/8/9 8/5/9 9//9 9/8/9 9/5/9 9/9 9/9/9 /5/9 /3/9 /9/9 /7/9 /3/9 //9 /7/9 /4/9 //9 /8/9 /5/9 /9 - /6/9 - //9 - //9-7/9 - /3/9 - //9 - /7/9 - /4/9-3/3/9-3//9-3/6/9-3/3/9-3/3/9-4/7/9-4/4/9-4//9-4/8/9-5/5/9-5//9-5/9/9-5/5/9-6//9-6/9/9-6/6/9-6/3/9-6/3/9-7/7/9-7/4/9-7//9-7/8/9-8/4/9-8//9-8/8/9-8/5/9-9//9-9/8/9-9/5/9-9//9-9/9/9 - /5/9 - /3/9 - /9/9 - /7/9 - /3/9 - //9 - /7/9 - /4/9 - //9 - /8/9 - /5/9 - //9 - /99 BY- 6 ± 5 33 ± 6 35 ± 5 3 ± 5 5 ± 5 4 ± 5 5 ± 5 9 ± 5 ± 5 5 ± 4 3 ± 4 3 ± 4 8 ± 4 8 ± 4 9 ± 4 7 ± 4 5 ± 4 4 ±4 5 ±4 7 ±4 3 ±5 5 ±4 4 ±4 ±4 7 ±4 8 ±4 5 ±4 9 5 9±4 5 6 ± 4 6 ± 4 8 ± 5 4 ± 4 4 ± 4 35 ± 5 35 ± 6 ± 5 6 ± 4 9±4 ±4 7 ±4 9 ±4 3 ±4 3 ±5 9 ±5 5 8 ± 5 4 ± 4 3 ± 5 4 ±6 7 ±4 GROUP I BY- BY-3 ± 5 33 ± 6 3 ± 5 35 ± 5 8 ± 5 5 ± 5 ± 4 6 ± 5 4 ± 5 ±.5 3 ± 4 5 ± 5 4 ± 4 7 ± 4 ± 4 5 ± 4 7 ± 4 7±4 ±4 4 ±4 3 ±5 3 ±4 4 ±4 6 ±4 7 ±4 ±4 5 ±4 5 ±4 8±4 5 ± 4 8 ± 5 5 ± 4 8 ± 5 ±4 8 ±4 3 ±4 38 ±6 ±5 ±5 4 ±4 3 ±4 6 ±4 ±4 ±4 9 ±5 7 ± 4 3 ± 5 ± 5 3 ± 4 33 ± 5 36 ± 6 6 ± 4 7 ± 5 9 ± 5 8 ± 5 33 ±5 9 ±5 ±5 5 ±5 7 ±5 3 ±5 3 ±5 7 ± 4 ± 4 ±3 4 ±4 ±4 5 ±4 4 ±4 4 ±4 3 ±4 ±4 ±5 9±3 8±4 3 ±4 7 ±4 4 ±4 8±4 5 ±4 7±4 ±5 4 ±4 6 ±4 6 ±5 9±4 ±4 ±4 3 ±5 5 ±4 9 ±5 ±4 ±4 ±4 ±4 ±4 5 ±4 4 ± 4 6 ± 4 3 ± 5 9 ± 4 35 ± 5 5 ± 5 5 ± 4 BY-4 3 ± 5 9 ± 5 38 ± 5 35 ± 5 9 ± 5 4 ± 5 ± 4 3 ± 5 4 ± 5 9 ± 5 6 ± 4 4 ± 5 4 ± 4 3 ± 4 9 ± 4 5 ± 4 ± 4 8 ± 4 4 ± 4 ± 4 ± 5 ± 4 ± 4 ± 4 6 ± 4 7 ± 4 9±4 34 ±5 ±4 5 ±4 6 ±4 7 ±4 ±5 ±4 5 ±4 4 ±4 35 ±6 4 ±5 ±5 ±4 ±4 6 ±4 5 ±4 ±4 9 ±5 4 ± 4 4 ± 5 6 ± 5 6 ± 4 36 ± 6 39 ± 6 :L 4 BY- 3 ± 5 33 ± 5 36 ± 5 39 ± 6 7 ± 5 7 ± 5 4 ± 5 33 ± 5 ± 5 ± 5 9 ± 4 ± 4 3 ± 4 5 ± 4 4 ± 5 6 ± 4 8 ± 4 8 ± 4 ± 4 7 ± 4 3 ± 5 9±3 9±4 ±4 3 ±5 6 ±4 5 ±4 ±4 5 ±5 8 ± 4 6 ± 4 7 ± 4 8 ± 4 8±4 6 ±4 7 ±4 3 ±5 3 ±5 8 ±5 8±4 ±4 4 ±4 4 ±4 8 ±4 7 ±4 4 ±4 4 ±5 ± 5 ± 4 33 ± 5 4 ± 6 3 ± 4 GROUP BY-4 6 ± 5 3 ± 5 3 ± 5 37 ± 5 5 ± 5 8 ± 5 4 ± 5 3 ± 5 9 ± 5 4 ± 5 6 ± 4 5 ± 5 ±4 4 ±4 8 ±4 6 ±4 ±4 8 ±4 ±4 ±4 5 ±5 ±3 ±4 5 ± 4 8 ± 4 9 ±4 3 ±4 5 ±4 ±4 3 ±5 3 ±4 7 ±4 ±5 6±4 3 ±4 8 ±4 33 ±6 ±5 4 ±5 9±4 9±4 7 ±5 4 ±4 ±4 9 ±5 7 ± 4 3 ± 5 9 ± 5 4 ± 4 35 ± 5 4 ± 6 6 ± 4 BY-6 7 ± 5 3 ± 5 34 ± 5 33 ± 5 8 ± 5 4 ± 5 3 ± 4 3 ± 5 8 ± 4 ± 5 7 ± 4 ± 4 ±4 6 ±4 8 ±4 5 ±4 4 ±4 3 ±4 ±4 ±4 8 ±4 ±4 3 ±4 7 ±4 ±4 9 ±4 ±4 6 ±4 9±4 ±4 5 ±4 8 ±4 3 ± 5 ± 4 4 ± 4 6 ± 4 3 ± 5 ± 5 ± 5 3 ± 4 ±4 ±4 7 ±4 3 ±4 7 ±4 4 ±5 4 ± 5 5 ± 4 3 ± 5 4 ± 6 8 ± 4 IGROUP III BY-8 9 ± 5 34 ± 5 3 ± 5 34 ± 5 8 ± 5 7 ± 5 ± 4 3 ± 5 ± 5 9 ± 4 5 ± 4 3 ± 4 ±4 3 ±4 ±4 5 ±4 5 ±4 4 ±4 ±4 3 ±4 6 ±5 ±4 ±4 6 ±4 8 ±4 8 ±4 9±4 ±4 8±4 8 ±4 4.±4 ±5 ± 5 ± 4 8 ± 4 35 ± 5 46 ± 6 6 ± 5 5 ± 5 4 ± 4 3 ± 4 ± 4 5 ± 4 4 ± 4 8 ± 4 5 ± 4 ± 4 8 ± 4 ± 4 35 ± 5 39 ± 6 4 ± 4 U MEN ±5 ±5 9 ± 4 ±6 ±6 ±6 ± 4 ±7 *THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES C-8 59 of 7

TBLE C-V. MONTHLY ND YERLY MEN VLUES OF GROSS BET CONCENTRTIONS IN IR PRTICULTE SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF E-3 PCI/CU METER ± SIGM GROUP I - NERSITE LOCTIONS GROUP II - FR FIELD LOCTIONS GROUP III - CONTROL LOCTIONS COLLECTION PERIOD /3/8 - /3/9 /3/9-3/3/9 3/3/9-3/3/9 3/3/9-4/8/9 4/8/9-6//9 6//9-6/3/9 6/3/9-7/8/9 7/8/9-9//9 9//9-9/9/9 9/9/9 - /3/9 /3/9 - //9 //9 - /9/9 MIN MX MEN± SD 38 3 8 3 4 5 3 + 3 7 5 7 3 5 + 8 5 ± 6 7 34 5 ± 3 9 8 7 ± 5 38 6 ±4 9 3 5 8 4 3 3 ± 6 4 9 ±4 COLLECTION PERIOD /3/8 /3/9 /3/9 3/3/9 3/3/9 3/3/9 3/3/9 4/8/9 4/8/9 6//9 6//9 6/3/9 6/3/9 7/8/9 7/8/9 9//9 9//9 9/9/9 9/9/9 /3/9 /3/9 //9 //9 /9/9 MIN MX MEN± SD 5 39 3 ± 8 8 33 5 ± 9 9 ± 4 6 ± 6 9 5 5 ± 9 3 6 ± 9 9 3 5 ± 8 6 3 5 ± 9 8 33 5 ± 8 3 ± 8 4 9 3 ± 9 4 3 ± 5 COLLECTION PERIOD /3/8 /3/9 /3/9 3/3/9 3/3/9 3/3/9 3/3/9 4/8/9 4/8/9 6//9 6//9 6/3/9 6/3/9 7/8/9 7/8/9 9//9 9//9 9/9/9 9/9/9 /3/9 /3/9 //9 //9 /9/9 MIN MX MEN± SD 8 34 3 ± 5 3 5 ± 9 5 ± 3 6 ± 7 6 5 ± 8 6 ± 7 8 8 ± 9 7 ± 5 46 33 ± 9 4 5 ± 5 8 ± 39 3 ± 6 /3/8 - /9/9 7 4 ± 5 /3/8 - /9/9 6 4 ± 6 /3/8 - /9/9 8 46 ± 7 -I' * THE MEN ND STNDRD DEVITION VLUES RE CLCULTED USING THE POSITIVE VLUES

TBLE C-V.3 CONCENTRTIONS OF GMM EMITTERS IN IR PRTICULTE SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF E-3 PCI/CU METER + SIGM STC BY- /3/8 3/3/9 6/3/9 9/9/9 COLLECTION PERIOD - 3/3/9-6/3/9-9/9/9 - /9/9 Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95 Cs-34 Cs-37 Ba-4 La-4 <.4 <7 <7 < 4 < < 45 < 55 < 4 < <9 4 <8 < < 6 <6 < 3 < 7 < 4 < < 93 < 977 < 85 < 567 < 55 < 64 < 554 < 79 MEN BY-4 /3/8 3/3/9 6/3/9 9/9/9-3/3/9-6/3/9-9/9/9 - /9/9 <6 <9 <6 < 7 < 8 < 4 < <6 <7 < <8 <9 < <6 <9 < 3 < < 4 < 665 < 83 < 4 < 5 < 34 < 74 < 569 < 7 MEN BY-6 /3/8 3/3/9 6/3/9 9/9/9-3/3/9-6/3/9-9/9/9 - /9/9 <6 <9 < < < 34 < 56 < 7 < < < 4 <6 <7 < < 5 <6 * 4 < 8 < 7 < < < 5 < 976 < 85 < 436 < 56 < 8 < 495 * 7 MEN BY-8 /3/8 3/3/9 6/3/9 9/9/9-3/3/9-6/3/9-9/9/9 - /9/9 <7 < * 8 < 3 < 43 < 9 <6 <8 <9 <9 < < 3 <6 <9 < 8 * < < 89 < 76 < < 46 < 4 < 36 < 49 < 9 MEN BY- /3/8 3/3/9 6/3/9 9/9/9-3/3/9-6/3/9-9/9/9 - /9/9 <9 <8 <7 < 5 < 3 < 38 < 4 <9 <9 <6 <8 <8 < <9 <7 < 4 < 6 < 7 < < 33 < < 89 < 584 < 397 < 466 < 344 < 46... MEN

TBLE C-V.3 CONCENTRTIONS OF GMM EMITTERS IN IR PRTICULTE SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF E-3 PCI/CU METER + SIGM STC COLLECTION PERIOD BY- /3/8-3/3/9 3/3/9-6/3/9 6/3/9-9/9/9 9/9/9 - /9/9 Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95 Cs-34 Cs-37 Ba-4 La-4 <6 < 8 < 3 <8 <6 < <955 < 3 < 5 < 36 < 3 < 6 < 7 < 5 < 3 < 744 < 5 < 5 < 68 < 6 < 4 < 5 < 5 < < 7 < < < 7 < 5 < < 397 < 485 < 33 < 639 < 7 MEN BY-3 /3/8-3/3/9 3/3/9-6/3/9 6/3/9-9/9/9 9/9/9 - /9/9 < <7 < 8 < 4 < 9 < 4 <7 < 4 <9 <8 <7 < <9 < < 3 7 < < 89 < 99 < < 438 < 44 < 378 < 37 < 4 MEN BY-4 /3/8-3/3/9 3/3/9-6/3/9 6/3/9-9/9/9 9/9/9 - /9/9 <7 <6 <6 <. < 36 < 57 < 6 < <9 6 <9 <8 <9 < 8 < 5 < 5 < <6 < 5 < 778 < 3 < 54 < 49 < 3 < 586 < 3 MEN O

TBLE C-VI. CONCENTRTIONS OF -3 IN IR IODINE SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF E-3 PCI/CU METER ± SIGM GROUPI I GROUPI GROUP III COLLECTION PERIOD BY- BY- BY-3 BY-4 BY- BY-4 BY-6 BY-O8 /3/8 -/6/9 < 49 < 48 < 48 < 48 < 65 < 65 < 64 < 67 /6/9 -//9 < 5 < 5 < 5 < 5 < 8 < 5 < 5 < 5 //9 -//9 < 5 < 5 < 5 < 5 < 59. < 6 < 59 < 59 //9 -/7/9 < 59 < 56 < 56 < 56 < 59 < 44 < 58 < 58 /7/9 -/3/9 < 59 < 59 < 6 < 6 < 68 < 66 < 67 < 69 /3/9 -//9 < 56 < 57 < 56 < 56 < 55 < 56 < 3 < 54 //9 -/7/9 < 6 < 6 < 7 < 7 < 5 < 5 < 5 < 6 /7/9 -/4/9 < 5 < 4 < 39 < 39 < 5 < 5 < 5 < 5 /4/9-3/3/9 < 6 < 6 < 6 6 < 7 < 7 < 7 < 8 3/3/9-3//9 < 9 < 8 < 8 < 9 < 8 < 8 < 8 < 7 3//9-3/6/9 < 43 < 43 < 43 < 44 < 6 < 6 < 6 < 6 3/6/9-3/3/9 < 6 < 37 < 6 < 6 < 69 < 69 < 69 < 68 3/3/9-3/3/9 < < < < < 4 < 5 < 4 < 4 3/3/9-4/7/9 < 69 < 68 < 5 < 69 < 59 < 58 < 58 <6 4/7/9-4/4/9 < 47 < 47 < 47 < 47 < 65 < 66 < 66 < 64 4/4/9-4//9 < 65 < 65 < 64 < 5 < 7 < 68 < 69 < 68 4//9-4/8/9 < 63 < 63 < 64 < 64 < 63 < 64 < 63 < 63 4/8/9-5/5/9 < 46 < 6 < 46 < 46 < 5 < 45 < 46 < 47 5/5/9-5//9 < 57 < 66 < 57 < 57 < 66 < 67 < 66 < 64 5//9-5/9/9 < 6 < 6 < 63 < 63 < 64 < 4 < 63 < 65 5/9/9-5/5/9 < 68 < 64 < 64 < 64 < 37 < 68 < 68 < 65 5/5/9-6//9 < 58 < 67 < 67 < 67 < 59 < 58 < 3 < 6 6//9-6/9/9 < 33 < 33 < 33 < 33 < 33 < 3 < 3 < 3 6/9/9-6/6/9 < 4 < 9 < 9 < 9 < 4 < 4 < 4 < 8 6/6/9-6/3/9 < 55 < 55 < 55 < 3 < 57 < 56 < 56 < 53 6/3/9-6/3/9 < 35 < 53 < 53 < 53 < 66 < 65 < 66 < 68 6/3/9-7/7/9 < 43 < 43 < 44 < 9 < 66 < 9 < 67 < 65 7/7/9-7/4/9 < 5 < 65 < 65 < 65 < 67 < 65 < 66 < 69 7/4/9-7//9 < 55 < 55 < 54 < 54 < 34 < 35 < 35 < 34 7//9-7/8/9 < 63 < 63 < 63 < 63 < 65 < 63 < 64 < 66 7/8/9-8/4/9 < 44 < 44 < 44 < 44 < 34 < 35 < 35 < 33 8/4/9-8//9 < 5 < 5 < 49 < 49 < 45 < 44 < 45 < 46 8//9-8/8/9 < 37 < 37 < 37 < 37 < 4 < 43 < 4 < 4 8/8/9-8/5/9 < 6 < 6 < 63 < 63 < 56 < 54 < 54 < 56 8/5/9-9//9 < 58 < 58 < 58 < 58 < 53 < 53 < 53 < 5 9//9-9/8/9 < 63 < 63 < 63 < 64 < 49 < 6 < 48 < 5 9/8/9-9/5/9 < 53 < 53 < 53 < 53 < 48 < 49 < 49 < 47 9/5/9-9//9 < 3 < 3 < 3 < 3 < 5 < 5 < 5 < 53 9//9-9/9/9 < 69 < 69 < 69 < 7 6 < 57 < 57 < 55 9/9/9 -/5/9 < < < < < 67 < 65 < 66 < 68 /5/9 -/3/9 < 68 < 68 < 68 < 67 < 5 < 54 < 53 < 5 /3/9 -/9/9 < < 49 < 49 < 49 < 37 < 38 < 37 < 37 /9/9 -/7/9 < 6 < 6 < 6 < 6 < 5 < 49 < 49 < 48 /7/9 -/3/9 < 5 < < 5 < 5 < 56 < 54 < 56 < 5 /3/9 -//9 < 64 < 64 < 65 < 65 < 53 < 55 < 54 < 5 //9 -/7/9 < 57 < 57 < 56 < 57 < 48 < 49 < 48 < 9 /7/9 -/4/9 < 68 < 68 < 68 < 68 < 59 < 59 < 59 < 58 /4/9 -//9 < 67 < <67 < 66 < 8 < 4 < 67 < 68 < 69 //9 -/8/9 < 49 < 49 < 5 < 5 < 53 < 53 < 53 < 5 /8/9 -/5/9 < 53 < 58 < 59 < 59 < 3 < 53 < 53 < 53 /5/9 -//9 < 69 < 69 < 7 < 7 < 6 < 6 < 6 < 6 //9 -/9/9 < 6 < 64 < 65 < 65 < 47 < 49 < 47 < 46 MEN - - - - - - - - C- C- 63 of 7

TBLE C-VII. CONCENTRTIONS OF -3 IN MILK SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM COLLECTION PERIOD /6/9 /3/9 3/3/9 4/7/9 5/5/9 5/9/9 6//9 6/6/9 6/3/9 7/4/9 7/8/9 8//9 8/5/9 9/8/9 9//9 /5/9 //9 /3/9 //9 CONTROL FRM BY-6- <.6 <.7 <.7 <.9 <.7 <.8 <.5 <.7 <.7 <.9 <.8 <.7 <.8 <.7 <.8 <.7 <.8 3.6 +.6 () <.6 INDICTOR FRM BY-- BY-3- <.6 <.6 <.9 <.8 <.8 <.7 <.9 <.9 <.5 <.4 <.8 <.7 <.5 <.6 <.6 <.7 <.8 <.7 <.8 <.9 <.7 <.8 <.8 <.7 <.8 <.8 <.7 <.7 <.7 <.8 <.9 <.7 <.7 <.7 <.8 <.6 <.9 <.8 MEN () SEE PROGRM EXCEPTIONS SECTION FOR EXPLNTION C-3 64 of 7

TBLE C-VII. CONCENTRTIONS OF GMM EMITTERS IN MILK SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM STC COLLECTION PERIOD BY-- /6/9 /3/9 3/3/9 4/7/9 5/5/9 5/9/9 6//9 6/6/9 6/3/9 7/4/9 7/8/9 8//9 8/5/9 9/8/9 9//9 /5/9 //9 /3/9 //9 Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95 Cs-34 Cs-37 Ba-4, La-4 <7 <6 < 4* <6 <6 <8 <6 <8 <6 <7 < 3 < 3 <8 <7 < 3 < < < 3 < 3 <7 < 5 * 4 < 3 <9 < 8 < <7 < <6 <8 <7 <8 < 4 3 <9 <6 < 4 < < < < 3 <6 < < 4 3 < <9 5 <9 <7 <6 <6 <6 <6 <6 <8 < 3 <8 <8 <9 <9 <9 <9 <9 <9 < 3 < <9 <7 < 3 <8 <6 <6 < 4 <6 <7 <6 <6 <6 < 56 < 34 * 3 < 34 < 4 < < 3 < 43 < 44 < 34 < 45 < 3 < 3 < 45 < 7 * 3 < < 47 < 38 < 4 <7 < < < 3 <7 < < 3 < 4 < < <6 < 4 <8 <8 <7 < MEN - Utl

TBLE C-VII. CONCENTRTIONS OF GMM EMITTERS IN MILK SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM STC COLLECTION PERIODf PERIOD BY-6- /6/9 /3/9 3/3/9 4/7/9 5/5/9 5/9/9 6//9 6/6/9 6/3/9 7/4/9 7/8/9 8//9 8/5/9 9/8/9 9//9 /5/9 //9 /3/9 //9 Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95 Cs-34 Cs-37 Ba-4 La-4 <6 <7 <6 <6 <6 <7 <6 <6 <8 <6 <6 <6 <6 < 7 < 7 < <6 < < 3 <9 < 5 < 4 < 4 < < 5 < 3 < < 3 < 3 < <6 <6. <7 <8 <6 <6 < 6 < 3 < 4 < < <8 < 7 < < 5 < < < 4 <9 < < 3 <9 <7 <6 <9 <6 <7 <6 < 4 < < <8 <9 <9 < <9 < <8 < < <8 < <9 <8 <6 <7 <6 <7 <6 <7 <6 < 5 < 46 < 3 < 3 < 39 < 4 < < 4 < 39 < 49 < 4 < 8 < 3 < 34 < < < 7 < 39 < 34 < 4 < <9 < 8 < <6 <8 < 4 < < < <8 < <8 <6 <7 < < MEN

TBLE C-VII. CONCENTRTIONS OF GMM EMITTERS IN MILK SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM C) STC COLLECTION PERIOD BY-3- /6/9 /3/9 3/3/9 4/7/9 5/5/9 5/9/9 6//9 6/6/9 6/3/9 7/4/9 7/8/9 8//9 8/5/9 9/8/9 9//9 /5/9 //9 /3/9 //9 MEN Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95 Cs-34 Cs- 37 Ba-4 La-4 <6 <7 <7 <7 <6 <6 <6 <6 <6 <6 5 3 <7 <6 4 <8 5 3 4 * 4 3 6 <8 <6 <7 <6 <7 <6 <8 * * * <6 * * 3 * 4 * 4 5 <8 * * <7 <6 <6 <6 <6 <7 <7 <7 <9 <6 <9 <9 <9 <7 <9 <9 <6 <7 <6 <6 <6 <7 <6 < 44 < 43 * 36 * 38 < 44 * 6 * 8 * 9 * 38 * 4 * 8 * 3 < 37 * 8 * * 5 < 33 * 4 3 4 <7 <9 <9 5 5 <6 4 <6 <6 <8. 8 < -.,

TBLE C-VIII. CONCENTRTIONS OF GMM EMITTERS IN VEGETTION SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTING STTION, 9 STC BY-CONTROL Potatoes Swiss Chard COLLECTION PERIOD 9/8/9 9/8/9 MEN RESULTS IN UNITS OF PCI/KG WET ± SIGM Mn-54 Co-58 Fe-59 Co-6 Zn-65 Nb-95 Zr-95-3 Cs-34 Cs-37 Ba-4 La-4 < < < 3 < 36 < 3 < 8 < 4 < 4 < 5 < 9 < < 7 < 4 < 3 < 55 < < 4 < 3 < 3 < 59 < < < < 3 BY-QUD Cabbage Potatoes 9/8/9 9/8/9 < 4 <6 < 4 < < 5 < < 6 < < 33 < < 8 < 4 < 5 < 4 < 5 < 5 < 5 < < 5 < < 3 < 5 < 6 MEN -4 BY-QUD Beet greens Beets 9/8/9 9/8/9 <9 < < 9 < 7 <9 6 <9 < < < 9 < 7 < 57 < < <.96 < 5 < 9 < < 9 < < 9 MEN BY-QUD 3 Kale Turnips 9/8/9 9/8/9 < <7 < 6 < < < < < 9 < 7 < 8 < < 6 < 4 < 55 < 9 < < < 8 < < 6 < 6 < 49 < 4 MEN BY-QUD 4 Beet greens Beets 9/9/9 9/9/9 < <8 < < 4 < 3 < 6 < 4 < 3 <8 <8 < 9 <9 < 6 < 5 < < < < 8 < 36 < 7 < 8 < 7 < MEN --

TBLE C-IX. QURTERLY TLD RESULTS FOR BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF MILLI-ROENTGEN/QURTER ± STNDRD DEVITIONS STTION MEN JN - MR PR - JUN JUL - SEP OCT - DEC CODE ± S.D. BY--.8 ± 6.4 5 9 9 4 BY--.5 ± 7. 4 8 9 5 BY-4-3.8 ± 5.3 6 6 BY-4-4. ± 5.9 6 7 BY-6-.3 ± 6. 6 9 3 BY-6-. ± 7. 4 9 9 6 BY-8-.8 ± 5.3 3 8 4 BY-8-.5 ± 7. 5 8 9 4 BY--.3 ± 3. 3 BY--. ± 3.7 8 9 BY-- 5.8 ± 6.6 9 4 8 BY-- 6. ± 5. 9 3 5 7 BY-3-4.3 ± 5.5 7 3 6 BY-3-4.3 ± 5.3 8 3 4 BY-4-3.8 ± 7.5 7 7 BY-4-5.3 ± 8 3 BY--.8 ± 5.5 4 8 9 BY--. ± 7.3 3 7 9 5 BY-- 6.8 ± 5.7 3 3 7 7 BY- - 7. ± 6.3 8 5 4 3 BY-3-5. ± 5.9 7 3 8 BY- 3-5.5 ± 6. 9 3 3 7 BY-3-3 6. ± 6.3 9 5 8 BY-4-5.5 ± 7. 8 3 9 BY- 4-5.3 ± 6.6 9 3 7 BY-4-3 4. ± 6.3 8 5 BY-5-5.8 ± 7.7 8 3 3 BY- 5-6.5 ± 7.4 8 3 4 3 BY- 6-5.8 ± 7. 7 4 3 BY-6-5.5 ± 7. 8 3 9 BY-7-8.3 ± 7.5 3 5 5 3 BY-7-8.3 ± 6.6 3 5 6 3 BY-7-3.3 ± 5.3 5 4 BY- 8-7.5 ±.6 9 6 8 7 BY-8-4.5 ± 7.4 7 3 8 BY-9-5. ± 4.3 7 5 6 BY-9-4.8 ± 5.5 8 3 6 BY-- 3.3 ± 7.5 8 9 4 BY-- 4.3 ± 8.9 7 9 BY--3 5.3 ± 3.8 8 4 4 5 BY--4 5.5 ± 5.3 7 5 8 BY--3 5.3 ± 3.4 7 3 5 6 BY--4 5.5 ± 6. 7 4 9 BY-3-5.5 ± 4.8 8 3 4 7 BY-3-. ± 4.9 5 3 BY-4-3.5 ± 8.7 9 5 BY- 4-4.5 ± 6. 8 3 6 BY-5-4. ± 6.3 8 5 BY-5-3.5 ± 5.3 5 3 6 C-8 69 of 7

TBLE C-IX. QURTERLY TLD RESULTS FOR BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF MILLI-ROENTGEN/QURTER ± STNDRD DEVITIONS STTION MEN JN - MR PR - JUN JUL - SEP OCT - DEC CODE ± S.D. BY-6-4.5 ± 3.8 6 4 6 BY-6-4.3 ± 7.5 7 8 BY-6-3 4.8 ± 6.4 6 6 7 BY--3 5. ± 9.4 8 3 BY--4 6.3 ± 4.7 8 3 6 8 BY-- 7. ± 3.5 6 () 6 9 BY-- 6.8 ± 5.5 8 5 4 3 BY-3-.3 ± 6.4 4 9 8 4 BY-3-4.3 ± 7.5 7 8 BY-4-4. ± 4.9 4 4 7 BY-4-6.5 ± 4.8 8 4 5 9 BY-5-7.3 ± 9.4 34 4 4 7 BY-5-3.8 ± 5.3 6 6 BY-6-5.8 ± 5.5 9 4 3 7 BY-6-5.8 ± 4.4 8 3 5 7 BY-7-5.3 ± 4. 7 3 4 7 BY-7-6.3 ± 8.7 3 3 3 BY-8-7.5 ± 7.4 9 4 5 3 BY-8-7.5 ± 6.8 6 8 4 3 BY-9-6. ± 7.7 7 3 3 3 BY-9-4 6. ± 4.6 8 4 4 8 BY--3 5.8 ± 8. 7 3 3 BY--4 5.3 ± 6.6 7 3 9 BY-- 5.8 ± 7.7 8 3 3 BY--4 5.8 ± 6.4 8 3 3 9.BY-- 7.3 ± 4.7 9 4 7 9 BY--4 9. ± 9.9 34 3 7 3 BY-3-6.8 ± 5.5 8 5 4 3 BY-3-4 7.3 ± 4.7 9 4 7 9 BY-4-4.8 ± 5. 8 4 5 BY-4-4 5.3 ± 7.5 8 9 BY-5-6. ± 4.9 9 4 4 7 BY-5-4 6.8 ± 4. 9 4 7 7 BY-6-8.3 ± 5.3 3 6 6 3 BY-6-5.3 ± 4.4 8 4 3 6 BY-3-.3 ± 4. 8 9 BY-3-3.8 ± 3. 5 3 5 BY-39-3.5 ±. 3 3 5 BY-39-3.5 ± 4.8 6 3 5 BY-39-3 4.3 ± 7.7 7 8 BY-39-4.8 ± 3. 3 3 BY-34-.5 ± 4.8 5 4 () SEE PROGRM EXCEPTIONS SECTIOIN FOR EXPLNTION C-9 7 of 7

TBLE C-IX. MEN QURTLY TLD RESULTS FOR THE INNER RING, OUTER RING, SPECIL INTEREST, OTHER ND CONTROL LOCTIONS FOR BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF MILLI-ROENTGENS/QURTER ± STNDRD DEVITIONS OF THE STTION DT COLLECTION PERIOD JN-MR PR-JUN JUL-SEP OCT-DEC INNER RING ± S.D. 7.5 ± 3.3. ± 4..9 ± 4.4 7. ± 4.8 OUTER RING SPECIL INTEREST OTHER CONTROL 8. ± 4. 3. ± 3.4 3.8 ± 4. 8.6 ± 4. 3.4 ± 3..3 ± 5.5 3. ± 6.6.4 ± 3.8 5.9 ± 4.7.3 ± 3..3 ± 4. 5.6 ± 4.9 4. ± 3 8. ±..5 ± 4 4. ±. TBLE C-IX.3 SUMMRY OF THE MBIENT DOSIMETRY PROGRM FOR BYRON NUCLER GENERTING STTION, 9 RESULTS IN UNITS OF MILLI-ROENTGEN/QURTER LOCTION INNER RING OUTER RING SPECIL INTEREST OTHER CONTROL SMPLES PERIOD NLYZED MINIMUM 44 7 7 8 8 8 56 8 8 8 PERIOD MXIMUM 3 34 8 3 5 PERIOD MEN ± S.D. 4.9 ± 6.4 6. ± 6.3.8 + 4.8 3.3 ± 6.5.6 ± 5.8 INNER RING STTIONS - BY--, BY--, BY--, BY--, BY-3-, BY-3-, BY-3-3, BY-4-, BY-4-, BY-4-3, BY-5-, BY-5-, BY-6-, BY-6-, BY-7-, BY-7-, BY-7-3, BY-8-, BY-8-, BY-9-, BY-9-, BY--, BY--, BY--3, BY--4, BY--3, BY--4, BY-3-, BY-3-, BY-4-, BY-4-, BY-5-, BY-5-, BY-6-, BY-6-, BY-6-3 OUTER RING STTIONS - BY--3, BY--4, BY--, BY--, BY-3-, BY-3-, BY-4-, BY-4-, BY-5-, BY-5-, BY-6-, BY-6-, BY-7-, BY-7-, BY-8-, BY-8-, BY-9-, BY-9-4, BY--3, BY--4, BY--, BY--4, BY--, BY--4, BY-3-, BY-3-4, BY-4-, BY-4-4, BY-5-, BY-5-4, BY-6-, BY-6- SPECIL INTEREST STTIONS - BY-3-, BY-3-, BY-39-, BY-39-, BY39-3, BY-39-4, BY-34- OTHER STTIONS - BY--, BY--, BY-4- BY-4-, BY-6-, BY-6-, BY--, BY--, BY--, BY--, BY-3-, BY-3-, BY-4-, BY-4- CONTROL STTIONS - BY-8-, BY-8- C- 7 of 7

FIGURE C- Surface Water - Gross Beta - Station BY- and BY-9 (C) Collected in the Vicinity of BNGS, - 4 BY- Oregon Pool of Rock River, Downstream I. 8.D L 4.. i - -) -:+- -' -3- -3-3 -3-a4 BY-9 (C) Byron, Upstream 4, --. + -+ 8a. - 4 G.C + 4.o4 No sarnples; No samples; river f ozen. river frozen. 4 No samples: river frozen. U.V4- I 4-. - -3- -3- -3- -3 j-3,-c.4 7 of 7

FIGURE C- (cont.) Surface Water - Gross Beta - Station BY- and BY-9 (C) Collected in the Vicinity of BNGS, 5-9 BY- Oregon Pool of Rock River, Downstream. 8.,-I C. 6. 4... I --5-4-6-9-6-3-7-6-8 --9 BY-9 (C) Byron, Upstream. T 8.,- C.) 6. + 4. + ~cvk.. I I I I --5-4-6-9-6-3-7-6-8 --9 DUE TO VENDOR CHNGE IN 5, < VLUES RE LLD VLUES JNURY THROUGH JUNE 5 ND MDC VLUES FTER JUNE 5 73 of 7

FIGURE C- Surface Water - Tritium - Stations BY- and BY-9 (C) Collected in the Vicinity of BNGS, - 4 BY- Oregon Pool of Rock River, Downstream -J 3 9 7 - -- -3- -3- t-3 - -3t-3-39--D4. BY-9(C) Byron, Upstream 5* 39-35 3i 7 - -4- D 4-7\ / - --OD -3- -3- -3- -3-3 -3--4 74 of 7

FIGURE C- (cont.) Surface Water - Tritium - Stations BY- and BY-9 (C) Collected in the Vicinity of BNGS, 5-9 BY- Oregon Pool of Rock River, Downstream 35 3 5,J C., 5 5 3-3-5 3-9-6-5-7-4-8 --9 --9 BY-9 (C) Byron, Upstream 5-4 5 + C. 4 5 +! I I I I 3-3-5 3-9-6-5-7-4-8 --9 --9 DUE TO VENDOR CHNGE IN 5, < VLUES RE LLD VLUES JNURY THROUGH JUNE 5 ND MDC VLUES FTER JUNE 5 75 of 7

FIGURE C-3 Ground Water - Tritium - Stations BY-4- and BY-8 Collected in the Vicinity of BNGS, - 4 BY-4-3 N. German Church Road 3wa Mo DO N \V/ I \" - -]L --) -3-M -4-34 -3-3 BY-8 McCoy Farmstead Wall dow - I--, ý, / \ / / - I-- \/,! _- 7N\/ i\,\. I- r-,-dl -3-9.3. -.3. -3o-94 76 of 7

FIGURE C-3 (cont.) Ground Water - Tritium - Stations BY-4- and BY-8 Collected in the Vicinity of BNGS, 5-9 BY-4-3 N. German Church Road 5.- ) 5 5 3-3-5-6-6-4-7 --7-8-8-6-9 BY-8 McCoy Farmstead Well 5 -I c3 5 5 3-3I-5-6-6-4-7 --7-8-8-6-9 DUE TO VENDOR CHNGE IN 5, < VLUES RE LLD VLUES JNURY THROUGH JUNE 5 ND MDC VLUES FTER JUNE 5 77 of 7

FIGURE C-4 Ground Water - Tritium - Station BY-3 Collected in the Vicinity of BNGS, - 4 BY-3 Wofford Well 5-4- 3 + ]o / \ -, \ / / -! I I I - - 3 Q -3-3 -3_O)4-3~-4 78 of 7

FIGURE C-4 (cont.) Ground Water - Tritium - Station BY-3 Collected in the Vicinity of BNGS, 5-9 BY-3 Wolford Well 5 -r -J 5 + 5 + 3 I I I I I 3/3/5 /6/6 /4/7 //7 /8/8 /6/9 DUE TO VENDOR CHNGE IN 5, < VLUES RE LLD VLUES JNURY THROUGH JUNE 5 ND MDC VLUES FTER JUNE 5 79 of 7

FIGURE C-5 Ground Water - Tritium - Stations BY-35 and BY-36 Collected in the Vicinity of BNGS, 6-9 BY-35 5 T 4,- a. 5 + 5-4--6-4-6 9-7-7 5--8 --9-7-9 BY-36 5-5 -J '3. + 5 + - 4--6-4-6 9-7-7 5--8 --9-7-9 NEW STTIONS IN 6 8 of 7

FIGURE C-6 Ground Water - Tritium - Stations BY-37 Collected in the Vicinity of BNGS, 6-9 BY-37 5 T,- U 5 + 5 + I I I I 4--6-4-6 9-7-7 5--8 --9-7-9 NEW STTION IN 6 8 of 7

FIGURE C-7 ir Particulates - Gross Beta - Stations BY-8 (C) and BY- Collected in the Vicinity of BNGS, - 4 BY-8 (C) Leaf River 5 4 "- -3- -3-4 -4- BY- Byron Nea rsite N 6 4 j D4O %- "4-34 -3-3,3DD4 8 of 7

FIGURE C-7 (cont.) ir Particulates - Gross Beta - Stations BY-8 (C) and BY- Collected in the Vicinity of BNGS, 5-9 BY-8 (C) Leaf River 6. 5. E m 4. 3 M9 CL,w 3.... -4-5 -3-6 --7 --8-3-8-9-9 BY- Byron Nearsite N 6. 5. m 3 CLl m 4. 3.... -4-5 -3-6 --7 --8-3-8-9-9 DUE TO VENDOR CHNGE IN 5, THE REPORTED UNITS CHNGED FROM E- PCI/M3 TO E-3 PCI/M3 83 of 7

FIGURE C-8 ir Particulates - Gross Beta - Stations BY- and BY-3 Collected in the Vicinity of BNGS, - 4 BY- Byron Nearsite ESE ID I Ru 4-3m-O -3- -3- -3-3 " -,4 BY-3 Byron NearsiterS. X 4-G -Dl- -34,3, M4, ýl -a 84 of 7

FIGURE C-8 (cont.) ir Particulates - Gross Beta - Stations BY- and BY-3 Collected in the Vicinity of BNGS, 5-9 BY- Byron Nearsite ESE 6. 5. m CL Pi C?. uj 4. 3.... -4-5 -3-6 --7 --8-3-8-9-9 BY-3 Byron Nearsite S 6. 5. E C.). 3 w C) 4. 3.... -4-5 -3-6 --7 --8-3-8-9-9 DUE TO VENDOR CHNGE IN 5, THE REPORTED UNITS CHNGED FROM E- PCI/M3 TO E-3 PCI/M3 85 of 7

FIGURE C-9 ir Particulates - Gross Beta - Station BY-4 Collected in the Vicinity of BNGS, - 4 BY-4 Byrom Nearsite SW 4.].4 86 of 7

FIGURE C-9 (cont.) ir Particulates - Gross Beta - Station BY-4 Collected in the Vicinity of BNGS, 5-9 BY-4 Byron Nearsite SW 6. 5. c 4. E c 3. 9 o... -4-5 -3-6 --7 --8-3-8-9-9 DUE TO VENDOR CHNGE IN 5, THE REPORTED UNITS CHNGED FROM E- PCI/M3 TO E-3 PCl/M3 87 of 7

FIGURE C- ir Particulates - Gross Beta - Stations BY- and BY-4 Collected in the Vicinity of BNGS, 5.- 9 BY- 6. 5. C.) a. 9 uj 5! 4. 3.... 7-5-5 5-9-6 4--7 3-5-8-6-9-3-9 BY-4 6. 5. E a. 4. 3. J o,...5-7-5-5 5-9-6 4--7 3-5-8-6-9-3-9 IR PRTICULTE GROSS BET NLYSES OF FR FIELD LOCTIONS STRTED IN JULY 5 88 of 7

FIGURE C- ir Particulates - Gross Beta - Station BY-6 Collected in the Vicinity of BNGS, 5-9 BY-6 6. 5. CL. ' 4. 3.... 7-5-5 5-9-6 4--7 3-5-8-6-9-3-9 IR PRTICULTE GROSS BET NLYSES OF FR FIELD LOCTIONS STRTED IN JULY 5 89 of 7

PPENDIX D INTER-LBORTORY COMPRISON PROGRM 9 of 7

Intentionally left blank 9 of 7

TBLE D- NLYTICS ENVIRONMENTL RDIOCTIVITY CROSS CHECK PROGRM TELEDYNE BROWN ENGINEERING, 9 (PGE OF 3) Identification Reported Known Ratio (c) Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/nalytics Evaluation (d) March 9 E6533-396 Milk Sr-89 Sr-9 pci/l 97.7 pci/l 4.9 5.6.4.96 E6534-396 Milk -3 Ce-4 Cr-5 Cs-34 Cs-37 Co-58 Mn-54 Fe-59 Zn-65 Co-6 pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l 66.7 87.5 75 8. ill 4 36 6 4 79.3 94.9 35 93.7 ill 9 8 99.9 56 4.84.9.9.88..96.6..3. E6536-396 P Ce-4 Cr-5 Cs- 34 Cs-37 Co-58 Mn-54 Fe-59 Zn-65 Co-6 pci pci pci pci pci pci pci pci pci 385 3 49 53 55 8 95 9 5 37 4 35 45 55 89 73.4.4.99..6..98.3. E6535-396 Charcoal -3 pci 8.8 79.4.4 June 9 E674-396 Milk Sr-89 Sr-9 pci/l 7 pci/l 9. 6.7.96.4 E6743-396 Milk -3 Ce-4 Cr-5 Cs-34 Cs-37 Co-58 Mn-54 Fe-59 Zn-65 Co-6 pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l 98. 6 389 44. 85 86.9 33 6 73 98. 84 4 66 9 9.9 37 75 3.96.9.97.87.96.95.97.3.99.96 E6745-396 P Ce-4 Cr-5 Cs-34 Cs-37 Co-58 Mn-54 Fe-59 Zn-65 Co-6 pci pci pci pci pci pci pci pci pci 86 6 35 6 83. 84 37 63 3 95 ill 53 79 7 8.4.3.6..6.5.9.36. W N () E6744-396 Charcoal -3 pci 9. 95.8.96 D- 9 of 7

TBLE D- NLYTICS ENVIRONMENTL RDIOCTIVITY CROSS CHECK PROGRM TELEDYNE BROWN ENGINEERING, 9 (PGE OF 3) Identification Reported Known Ratio (c) Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/nalytics Evaluation (d) September 9 E6897-396 Milk Sr-89 Sr-9 pci/l 3 7 pci/l 7.4 8.8.6.93 E6898-396 Milk -3 Ce-4 Cr-5 Cs- 34 Cs- 37 Co-58 Mn-54 Fe-59 Zn-65 Co-6 pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l 89. 49 3 4. 7 96.3 54 3 54 98.6 75 3 85 99.4 6 47 4 6.9.9.96.85.93.97.98.5.4.96 E69-396 P Ce-4 Cr-5 Cs-I 34 Cs- 37 Co-58 Mn-54 Fe-59 Zn-65 Co-6 pci pci pci pci pci pci pci pci pci 8 45 7.8 5 6 9 97 98.7 6 3 7 9 58 98 94....99.6.6.7.98.9.5 E6899-396 Charcoal -3 pci 89.5 9.3.97 December 9 E6946-396 Milk Sr-89 Sr-9 pci/l 3 3 pci/l 9.3 7.9..8 E6947-396 Milk -3 Ce-4 Cr-5 Cs-34 Cs- 37 Co-58 Mn-54 Fe-59 Zn-65 Co-6 pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l pci/l 79. 93 5 63 78 76 36 4 87.3 548 53 79 78 78 345 56.9.96.93.88.9.95...99.94.94 E6949-396 P Ce-4 Cr-5 Cs-34 Cs-37 Co-58 Mn-54 Fe-59 Zn-65 Co-6 pci pci pci pci pci pci pci pci pci 3 9 6 93.4 ill 8. 6 55 35 3 8 9 9.5 8 9.8 9.8 76 3..4.9..3.89.7.88.3 D- 93 of 7

TBLE D- NLYTICS ENVIRONMENTL RDIOCTIVITY CROSS CHECK PROGRM TELEDYNE BROWN ENGINEERING, 9 (PGE 3 OF 3) Identification Reported Known Ratio (c) Month/Year Number Matrix Nuclide Units Value (a) Value (b) TBE/nalytics Evaluation (d) December 9 E6948-396 Charcoal -3 pci 93.3 93.9.99 () Detector 7 appears to have a slightly high bias. Detector 7 was removed from service until it can be recalibrated. NCR 9-3 (a) Teledyne Brown Engineering reported result. (b) The nalytics known value is equal to % of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation. (c) Ratio of Teledyne Brown Engineering to nalytics results. (d) nalytics evaluation based on TBE internal QC limits: = cceptable. Reported result falls within ratio limits of.8-.. W-cceptable with warning. Reported result falls within. 7-.8 or.-.3. N = Not cceptable. Reported result falls outside the ratio limits of <. 7 and >.3. D-3 94 of 7

TBLE D- ER ENVIRONMENTL RDIOCTIVITY CROSS CHECK PROGRM TELEDYNE BROWN ENGINEERING, 9 (PGE OF ) Identification Reported Known Month/Year Number Media Nuclide Units Value (a) Value (b) Control Limits Evaluation (c) pril 9 RD 77 Water Sr-89 Sr-9 Ba-33 Cs-34 Cs-37 Co-6 Zn-65 Gr- Gr-B -3 H-3 pci/l 57.4 pci/l 3.6 pci/l 55. pci/l 65.8 pci/l 57 pci/l 86.4 pci/l 85.5 pci/l 47.7 pci/l 45. pci/l 5. pci/l 9733 48.3 3.4 5.7 7.9 68 88.9 84.4 54. 43.5 6. 3 37.8-55.7.9-36.4 43.4-58.3 59.5-8. 5-87 8.- 76.- 8.3-67.7 9. - 5.8.7-3.8 78-3 N () October 9 RD 79 Water Sr-89 Sr-9 Ba- 33 Cs- 34 Cs-37 Co-6 Zn-65 Gr- Gr-B -3 H-3 pci/l 64.75 pci/l 3.3 pci/l 97.9 pci/l 76.8 pci/l 59.9 pci/l pci/l 5 pci/l 9.6 pci/l 8.5 pci/l. pci/l 633 6. 3.7 9.9 79.4 54.6 7 99.5 3. 6.. 64 5.-7..4-35.6 78.3-65. - 87.3 49. -6.9 5-3 89.6-9.6-3. 6. - 33.9 8.4-6.5 43-8 () Calculation did not allow for Y-9 ingrowth on the Sr-89 mount. NCR 9-4 (a) Teledyne Brown Engineering reported result. (b) The ER known value is equal to % of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation. (c) ER evaluation: =acceptable. Reported result falls within the Warning Limits. N=not acceptable. Reported result falls outside of the Control Limits. CE=check for Error. Reported result falls within the Control Limits and outside of the Warning Limit. D-4 95 of 7

TBLE D-3 DOE'S MIXED NLYTE PERFORMNCE EVLUTION PROGRM (MPEP) TELEDYNE BROWN ENGINEERING, 9 (PGE OF ) Identification Reported Known cceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c) March 9 9-MaW Water Cs-34 Cs-37 Co-57 Co-6 H-3 Mn-54 Sr-9 Zn-65 Bq/L 8.8.5 Bq/L.6 Bq/L 7. 8.9 Bq/L 6. 7. Bq/L 33 33.9 Bq/L 3.8 4.7 Bq/L 6.88 7. Bq/L 3. 3.6 8.5-9.3 () 3.-4.6.5 -.37 3.6-43..6-9.6 5.5-9.37 9.5-7.7 9-GrWO Water Gr- Gr-B Bq/L.59.635 Bq/L.87.7 >.-.7.64-.9 9-MaS Soil Cs-34 Cs-37 Co-57 Co-6 Mn-54 K-4 Sr-9 Zn-65 Bq/kg 433 467 Bq/kg 649 65 Bq/kg -. Bq/kg 3.9 4.3 Bq/kg 339 37 Bq/kg 644 57 Bq/kg 45 57 Bq/kg 7 4 37-67 44-787 () () 5-399 399-74 8-334 69-35 9-RdF P Cs-34 Cs- 37 Co-57 Co-6 Mn-54 Sr-9 Zn-65 Bq/sample.77.93 Bq/sample.4.5 Bq/sample.4.3 Bq/sample.33. Bq/sample.4.79 Bq/sample.73.64 Bq/sample.3.36.5-3.8.6-.98.9 -.69.85 -.59.5898 -.95.448 -.83.95 -.77 9-GrF P Gr- Gr-B Bq/sample.88.348 Bq/sample.33.79 >. -.696.4 -.49 March 9 9-RdV Vegetation Cs-34 Cs-37 Co-57 Co-6 Mn-54 K-4 Sr-9 Zn-65 Bq/sample 3.48 3.4 Bq/sample.5.93 Bq/sample 3..36 Bq/sample -.5 Bq/sample.98.3 Bq/sample 64. Bq/sample.9.6 Bq/sample.73.354.38-4.4.65-..65-3.7 ().6 -.99 (4).88 -.638.948 -.76 W N (3) W W September 9 9-MaW Water Cs- 34 Cs- 37 Co-57 Co-6 H-3 Mn-54 Sr-9 Zn-65 Bq/L 6.5 3. Bq/L 37. 4. Bq/L 3. 36.6 Bq/L 4. 5.4 Bq/L 75 634. Bq/L -.5 Bq/L 3.9.99 Bq/L 6. 6.9.5-4.9 8.8-53.6 5.6-47.6.8 -. 443.9-84.3 () 9.9-6.89 8.8-35. 9-GrW Water Gr- Gr-B Bq/L.7.47 Bq/L 9.7 7.53 >. -.94 3.77-.3 D-5 96 of 7

TBLE D-3 DOE'S MIXED NLYTE PERFORMNCE EVLUTION PROGRM (MPEP) TELEDYNE BROWN ENGINEERING, 9 (PGE OF ) Identification Reported Known cceptance Month/Year Number Media Nuclide Units Value (a) Value (b) Range Evaluation (c) September 9 9-MaS Soil m-4 Cs- 34 Cs-37 Co-57 Co-6 Mn-54 K-4 Sr-9 Zn-65 Bq/kg Bq/kg Bq/kg Bq/kg Bq/kg Bq/kg Bq/kg Bq/kg Bq/kg 74.7.554 76 66 35 876 45 55 37 89.8 6.9-6.7 () 669 468-87 586 4-76 37. 9-45 796 557-35 375 63-488 455 39-59 78 85-53 9-RdF P Cs- 34 Cs- 37 Co-57 Co-6 Mn-54 Sr-9 Zn-65 Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample -..4 5.98. 5.6.95 4.39.4 6.48.3 5.49.835 3.93 ().98 -.8 4.54-8.4.7 -.34 3.84-7.4.585 -.86.75-5. 9-GrF P Gr- Gr-B Bq/sample.357.659 >. -.38 Bq/sample.43.3.66 -.98 9-RdV Vegetation Cs- 34 Cs- 37 Co-6 Mn-54 K-4 Sr-9 Zn-65 Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample Bq/sample -.7.36.58 8.36 57.8.73 -.59 ().43.7-3.6.57.8-3.34 7.9 5.5-.3 (4).78.5-.3 () () False positive test. () Sensativity evaluation. (3) Homogeniety problem. MPEP requires using entire sample but due to geometry limitations we can only use part of the sample. NCR 9-3 (4) Not evaluated by MPEP. (a) Teledyne Brown Engineering reported result. (b) The MPEP known value is equal to % of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation. (c) DOE/MPEP evaluation: =acceptable, W=acceptable with warning, N=not acceptable. D-6 97 of 7

PPENDIX E EFFLUENT REPORT 98 of 7

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TBLE OF CONTENTS IN T R O D U C T IO N... S U M M R Y..... EFFLUENTS... 3.. Gaseous Effluents to the tmosphere... 3.. Liquids Released to Rock River... 3.. SOLID RDIOCTIVE WSTE... 3 3.. D O S E TO M N... 4 3.. Gaseous Effluent Pathways... 4 3... N oble G ases... 4 3... Gamma Dose Rates... 4 3... Beta ir and Skin Dose Rate... 4 3... Radioactive Iodine... 5 3... Dose to Thyroid... 5 3.. Liquid Effluent Pathways... 5 3.3. ssessment of Dose to Member of Public... 6 4.. S IT E M ET EO R O LO G Y...... 6 of 7

Table of Contents (cont.) PPENDIX E- DT TBLES ND FIGURES... E-. Station Releases Table.- G aseous Effluents... E-. Table.- Liquid Effluents... E -.3 Table 3.- Maximum Doses Resulting from irborne Releases... E-.4 Table 3.- Maximum Doses Resulting from Liquid Discharges... E-.8 Table 3.4- Maximum Doses Resulting from irborne Releases Based On Concurrent Meteorological Data... E-. ii of 7

INTRODUCTION Liquid effluents from Byron Station are released to the Rock River in controlled batches after radioassay of each batch. Gaseous effluents are released to the atmosphere and are calculated on the basis of analyses of weekly grab samples and grab samples of batch releases prior to the release of noble gases as well as continuously collected composite samples of iodine and particulate radioactivity sampled during the course of the year. The results of effluent analyses are summarized on a monthly basis. irborne concentrations of noble gases, -3, and particulate radioactivity in offsite areas are calculated using isotopic composition of effluents and meteorological data. Environmental monitoring is conducted by sampling at indicator and control (background) locations in the vicinity of Byron Station to measure changes in radiation or radioactivity levels that may be attributable to station operation. If significant changes attributable to Byron Station are measured, these changes are correlated with effluent releases. External gamma radiation exposure from noble gases and internal dose from -3 in milk are the critical pathways at this site; however, an environmental monitoring program is conducted which also includes other pathways. - - of 7

SUMMRY Calculations based on gaseous and liquid effluents, Rock River flow and meteorological data indicate that public dose due to radioactive material attributable to Byron Station during the period does not exceed regulatory or Offsite Dose Calculation Manual (ODCM) limits. The Total Effective Dose Equivalent (TEDE) due to licensed activities at Byron Station calculated for the maximum-exposed individual for the period is 3.9E- mrem. The annual limit on TEDE is mrem. The assessment of radiation doses to the public is performed in accordance with the ODCM. The results of these analyses confirm that the station is operating in compliance with CFR5 ppendix I, CFR and 4CFR9. There were no additional operational controls implemented which affected the areas of radiological effluents in 9. There were no measurements which exceeded the reporting levels, including any which would not have been attributable to station effluents. The results of the current radiological environmental monitoring program are approximately the same as those found during the pre-operational studies conducted at Byron Station. -- 3 of 7

. EFFLUENTS. Gaseous Effluents to the tmosphere Measured concentrations and isotopic composition of noble gases, radioiodine, tritium and particulate radioactivity released to the atmosphere during the year, are listed in Table.-. total of.e+ curies of fission and activation gases were released with a maximum average quarterly release rate of.33e+ pci/sec. total of. E-4 curies of -3 were released during the year with a maximum average quarterly release rate of 6.4 E-6 pci/sec. total of.5 E-5 curies were released as airborne particulate matter with a maximum average quarterly release rate of.e-6 pci/sec. lpha-emitting radionuclides were below detectable limits. total of.ooe+ curies of other radioisotopes were released with a maximum average quarterly release rate of.ooe+ pci/sec. total of.5e+ curies of tritium were released with a maximum average quarterly release rate of.6e+ pci/sec.. Liquids Released to Rock River total of.76e+ liters of radioactive liquid wastes (prior to dilution) containing.e- curies (excluding tritium, noble gases and alpha) were discharged from the station. These wastes were released at a maximum quarterly average concentration of. E-9 pci/ml. total of.8 E+3 curies of tritium were released. Quarterly release totals of principal radionuclides in liquid effluents are given in Table.-.. SOLID RDIOCTIVE WSTE Solid radioactive wastes were shipped by truck. For detail, refer to Byron Station 9 Effluent Report. -3-4 of 7

3. DOSE TO MN 3. Gaseous Effluent Pathways Table 3.- summarizes the doses resulting from releases of airborne radioactivity via the different exposure pathways. 3.. Noble Gases 3... Gamma Dose Rates Offsite Gamma air and whole body dose rates are shown in Table 3.- and were calculated based on measured release rates, isotopic composition of the noble gases, and average meteorological data for the period. Dose rates based on concurrent meteorological data are shown in Table 3.4-. Based on measured effluents and average meteorological data, the maximum total body dose to an individual would be.73e- mrem for the year (Table 3.-), with an occupancy or shielding factor of.7 included. The maximum total body dose based on measured effluents and concurrent meteorological data would be 9.7E-6 mrem (Table 3.4-). The maximum gamma air dose was.64e-4 mrad (Table 3.-) based on measured effluents and average meteorological data, and.93e-5 mrad based on concurrent meteorological data (Table 3.4-). 3... Beta ir and Skin Dose Rates The range of beta particles in air is relatively small (on the order of a few meters or less); consequently, plumes of gaseous effluents may be considered "semi-infinite" for purpose of calculating the dose from beta radiation incident on the skin. However, the actual dose to sensitive skin tissues is difficult to calculate due to the effect of the beta particle energies, thickness of inert skin and clothing covering sensitive tissues. For purposes of this report the skin is taken to have a thickness of 7. mg/cm and an occupancy factor -4-5 of 7

3.. Radioactive Iodine of. is used. The skin dose based on concurrent meteorological data for the year was.5e-4 mrem (Table 3.4-) The maximum offsite beta air dose for the year, based on measured effluents and average meteorological data, was 6.36E-4 mrad (Table 3.-). The beta air dose based on concurrent meteorological data was 4.5E-4 mrad (Table 3.4-). The human thyroid exhibits a significant capacity to concentrate ingested or inhaled iodine. The minimal levels of radioiodine, -3, released during routine operation of the station, may be made available to man resulting in a dose to the thyroid. The principal pathway of interest for this radionuclide is ingestion of radioiodine in milk. Calculations made for 9 and previous years indicate that contributions to doses from inhalation of -3 and -33 and ingestion of -33 in milk are negligible. 3... Dose to Thyroid The hypothetical thyroid dose to the maximum exposed individual living near the station via ingestion of milk was calculated. The radionuclide considered was -3 and the source of milk was taken to be the nearest dairy farm with the cows pastured from May through October. The maximum thyroid dose was 7.OE- mrem during the year (Table 3.- [infant]). 3. Liquid Effluent Pathways The three principal pathways through the aquatic environment for potential doses to man from liquid waste are ingestion of potable water, eating aquatic foods, and exposure while on the shoreline. Not all of these pathways are significant or applicable at a given time or station but a reasonable approximation of the dose can be made by adjusting the dose formula for season of the year or type and degree of use of the aquatic environment. NRC developed equations* were used to calculate the doses to the whole body, lower GI tracts, thyroid, bone and skin; specific parameters for use in the equations are given in the Exelon Offsite Dose Calculation -5-6 of 7

Manual. The maximum whole body dose for the year was.9e- mrem (adult) and no organ dose exceeded 3.6E- mrem (Table 3.- [adult]). 3.3 ssessment of Dose to Member of Public During the period January to December 9, Byron Station did not exceed the limits below as shown in Table 3.- and Table 3.- (based on yearly average meteorological data), and Table 3.4- (based on concurrent meteorological data): 4. SITE METEOROLOGY The RETS limits on dose or dose commitment to a member of the public due to radioactive materials in liquid effluents from each reactor unit (.5 mrem to the whole body or 5 mrem to any organ during any calendar quarter; 3 mrem to the whole body or mrem to any organ during the calendar year). The RETS limits on air dose in noble gases released in gaseous effluents to a member of the public from each reactor unit (5 mrads for gamma radiation or mrad for beta radiation during any calendar quarter; mrad for gamma radiation or mrad for beta radiation during a calendar year). The RETS limits on dose to a member of the public due to iodine-3, iodine-33, tritium, and radionuclides in particulate form 'with half-lives greater than eight days in gaseous effluents released from each reactor unit (7.5 mrem to any organ during any calendar quarter; 5 mrem to any organ during any calendar year). The CFR limit on Total Effective Dose Equivalent to individual members of the public ( mrem). summary of the site meteorological measurements taken during each calendar quarter of the year is given in ppendix E. The data are presented as cumulative joint frequency distributions of the wind direction for the 5' level and wind speed class by atmospheric stability class determined from the temperature difference between the 5' and 3' levels. Data recovery for all measurements on the tower as 99.8% during 9 (Table 3.4-). -6-7 of 7

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PPENDIX E- DT TBLES ND FIGURES 9 of 7

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Table.- Byron Station Unit One 9 EFFLUENT ND WSTE DISPOSL REPORT TBLE GSEOUS EFFLUENTS - SUMMTION OF LL RELESES Reg Guide. - Unit 9 REPORT FOR 9 Fission and ctivation. Total Release. vg. Release Rate Units Gases Ci uci/sec QTR QTR QTR 3 QTR 4 YER.67E-.8E- 3.63E-.6E+.4E+ 3.39E-.89E- 4.6E-.33E+ 3.6E- Iodine-3. Total Release Ci. vg. Release Rate uci/sec.e+.ooe+ 6.99E-6 5.96E-6.9E-5.E+.E+ 8.86E-7 7.56E-7 4.E-7 Particulates Half Life. Total Release. vg. Release Rate Tritium. Total Release. vg. Release Rate >= 8 days Ci.OOE+ 4.56E-6 8.85E-6.OOE+.34E-5 uci/sec.e+ 5.78E-7.E-6.E+ 4.5E-7 Ci.6E+ 3.E+.6E+ 7.74E+ 5.3E+ uci/sec 3.9E- 3.95E+.47E+ 9.8E-.68E+ Gross lpha. Total Release. vg. Release Rate Ci uci/sec.ooe+.e+.e+.ooe+.ooe+.e+.ooe+.ooe+.ooe+.e+ Byron Station Unit Two 9 EFFLUENT ND WSTE DISPOSL REPORT TBLE GSEOUS EFFLUENTS - SUMMTION OF LL RELESES Reg Guide. - Unit REPORT FOR 9 Units QTR QTR QTR 3 QTR 4 YER Fission and ctivation. Total Release. vg. Release Rate Gases Ci uci/sec.57e-.3e-.33e-.7e- 6.7E-.99E-.65E-.96E-.36E-.99E- Iodine-3. Total Release.. vg. Release Rate Particulates Half Life. Total Release. vg. Release Rate Tritium. Total Release. vg. Release Rate Gross lpha. Total Release. vg. Release Rate Ci.OOE+.OOE+ 3.8E-5 5.5E-5 8.85E-5 uci/sec.ooe±.ooe+ 4.8E-6 6.4E-6.8E-6 >= 8 days Ci.OOE+.OOE+ 6.86E-7 9.77E-7.66E-6 uci/sec.ooe+.ooe+ 8.7E-8.4E-7 5.7E-8 Ci 9.3E+ 5.94E+.5E+.6E+ 5.6E+ uci/sec.6e+ 7.53E-.6E+.4E+.64E+ Ci.OOE+.OOE+.OOE+.OOE+.E+ uci/sec.e+.ooe+.ooe+.ooe+.ooe+ E-. of 7

Table.- Byron Station Unit One 9 EFFLUENT ND WSTE DISPOSL REPORT TBLE LIQUID EFFLUENTS - SUMMTION OF LL RELESES Reg Guide. - Unit 9 REPORT FOR 9 Units QTR QTR QTR 3 QTR 4 YER Fission and ctivation Products. Total Release Ci. vg. Diluted Conc. uci/ml Tritium. Total Release Ci. vg. Diluted Conc. uci/ml Dissolved and Entrained Gases. Total Release Ci. vg. Diluted Conc. uci/ml Gross lpha Radioactivity. Total Release Ci 3.35E-3.64E-3.3E-3.77E-3.5E-.E-9 7.4E- 6.49E- 8.38E- 7.6E-.63E+.E+ 4.4E+.8E+ 9.7E+ 4.9E-5 5.96E-5.6E-4 3.56E-5 6.59E-5 3.54E-3 4.88E-6.64E-3.OOE+ 5.8E-3.7E-9.37E- 4.58E-.OOE+ 3.76E-.E+.E+.OOE+.OOE+.OOE+ Volume of liquid waste liters 3. 3E+9 3. 56E+9 3.58E+9 3. 3E+9.38E+ Volume of dil. water liters. OOE+. E+. E+.OOE+. OOE+ Byron Station Unit Two 9 EFFLUENT ND WSTE DISPOSL REPORT TBLE LIQUID EFFLUENTS - SUMMTION OF LL RELESES Reg Guide. - Unit 9 REPORT FOR 9 Units QTR QTR QTR 3 QTR 4 YER Fission and ctivation Products. Total Release Ci. vg. Diluted Conc. uci/ml 3. 35E-3.E-9. 64E-3 7.4E-. 3E-3 6.49E-. 77E-3 8. 38E-. 5E- 7. 6E- Tritium. Total Release Ci. vg. Diluted Conc. uci/ml Dissolved and Entrained Gases. Total Release Ci. vg. Diluted Conc. uci/ml Gross lpha Radioactivity. Total Release Ci.63E+.E+ 4.4E+.8E+ 9.7E+ 4.9E-5 5.96E-5.6E-4 3.56E-5 6.59E-5 3.54E-3 4.88E-6.64E-3.OOE+ 5.8E-3.7E-9.37E- 4.58E-.OOE+ 3.76E-.OOE+.OOE+.OOE+.OOE+.OOE+ Volume of liquid waste liters 3.3E+9 3. 56E+9 3. 58E+9 3.3E+9.38E+ Volume of dil. water liters. E+. OOE+. OOE+.OOE+. OOE+ E-. of 7

Table 3.- Byron Station Unit One 9 4CFR9 URNIUM FUEL CYCLE DOSE REPORT GSEOUS DOSE SUMMRY Unit 9 Report for: 9 Unit Range - From: To: I&P DOSE LIMIT NLYSIS ge nnual - Limit Group 9 - dmin. ny Organ INFNT 9 - dmin. Total Body CHILD NNUL 9 Dose Limit Organ (mrem) (mrem) THYROID 3.55E-.3E+ TBODY 8.67E-3.5E+ Max % of Limit 3. 5E- 8.5E- 9 - T.Spc. ny Organ INFNT THYROID 3.55E- Receptor: 5 Composite Crit. Receptor - IP Distance:. (meters) Compass Point: N Critical Pathway: Grs/Goat/Milk (GMILK) Major Contributors ( % or greater to total) Nuclide Percentage H-3. 9E+ CR-5 6.5E-6 CO-58.lIE-4-3 7.9E+ -3 3.3E-3-33.5E+ CS-36 4.E-5 TE-3M.OOE+.5E+.37E- 9 - T.Spc. Total Body CHILD TBO DY 8.67E-3.5E+ 5.78E- Receptor: 5 Composite Crit. Receptor - IP Distance:. (meters) Compas s Point: N Critical Pathway: Vegetation (VEG) Major Contributors ( % or greater to total) Nuclide Percentage H-3 9. 97E+ CR-5.73E-5 CO-58 7.99E-4-3.44E- -3 8.75E-4-33 8.84E-3 CS-36 8.3E-3 TE-3M.OOE+ E-.3 3 of 7

4CFR9 URNIUM FUEL CYCLE DOSE REPORT GSEOUS DOSE SUMMRY 9 Unit Report for: 9 Unit Range - From: To: NG DOSE LIMIT NLYSIS NNUL 9 Dose Limit nnual - Limit (mrad) (mrad). 9 - dmin. Gamma 8.8E-5 7.5E+ 9 - dmin. Beta 3.8E-4.5E+ Max % of Limit. 9E-3.E-3 9 - T.Spc. Gamma 8.8E-5.OOE+ 8.8E-4 Receptor: 4 Composite Crit. Receptor - NG Distance:. (meters) Compass Point: N Nuclide Percentage R-4 4.lE+ KR-85. 8E+ XE-38.76E+ KR-85M 3.3E- XE-35 6.9E+ XE-33M.35E- XE-3M.3E- XE-33 3.6E+ 9 - T.Spc. Beta 3.8E-4.OOE+.59E-3 Receptor: 4 Composite Crit. Receptor - NG Distance:. (meters) Compass Point: N Nuclide Percentage R-4 KR-85 XE-38 KR-85M XE-35 XE-33M XE-3M XE-33 9.6E- 9.5E+ 9.OOE- 3.7E-3 5.6E- 3.85E- 5.55E- 6.8E+ E-.4 4 of 7

4CFR9 URNIUM FUEL CYCLE DOSE REPORT 9 Unit Report for: 9 Unit Range - From: To: MXIMUM Dose Type DOSE NLYSIS ge Dose Group Organ (mreim) NNUL 9 ny Organ Liquid Receptor: Gaseous Receptor: 5 Distance:. DULT GILLI.85] E- Liquid Receptor Composite Crit. Receptor - IP (meters) Compass Point: N Liquid Dose: Critical Pathway: Major Contributors Nuclide H-3 MN-54 CO-58 CO-6 NB-95 G-IIOM TE-5M -3 CS-37.8E- % of Fresh Water Fish % or greater Percentage 7.93E+ 3. 5E- 7.3E+ 3. 85E+.9E+ 4. 65E-3 8. 4E+ 4.E-5.35E- Total: 9.7E+ - Sport (FFSP) to total) Gaseous Dose: Critical Pathway: Major Contributors Nuclide H-3 CR-5 CO-58-3 -3-33 CS-36 TE-3M 5.5E-3 % of Total:.84E+ Vegetation (VEG) % or greater to total) Percentage 9.99E+.44E-4.94E-3 6.87E-.7E-3.9E-.7E-3.OOE+ MXIMUM Dose Type DOSE NLYSIS ge Group Organ Dose (mrem) NNUL 9 Total Body DULT TBODY Liquid Receptor: Liquid Receptor Gaseous Receptor: 5 Composite Crit. Re ceptor - IP Distance:. (meters) Compass Point.5E- : N -E-.5 5 of 7

4CFR9 URNIUM FUEL CYCLE DOSE REPORT Liquid Dose: Critical Pathway: Major Contributors Nuclide H-3 MN-54 CO-58 CO-6 NB-95 G-IOM TE-5M -3 CS-37 Gaseous Dose: Critical Pathway: Major Contributors Nuclide H-3 CR-5 CO-58-3 -3-33 CS-36 TE-3M.46E- % of Total: 9.67E+ Fresh Water Fish - Sport (FFSP) % or greater to total) Percentage 9.76E+.49E- 9.58E- 5.57E-.8E-4 8.33E-6 3.48E-.E-4 5.63E- 5.6E-3 % of Total: 3.48E+ Vegetation (VEG) % or greater to total) Percentage 9.98E+ 4.36E-5 9.88E-4.45E-.36E-3 5.53E-3 5.96E-3.OE+ E-.6 6 of 7

Table 3.- (cont.) Byron Station Unit Two 9 4CFR9 URNIUM FUEL CYCLE DOSE REPORT GSEOUS DOSE SUMMRY Unit 9 Report for: 9 Unit Range - From: To: I&P DOSE LIMIT NLYSIS-------- ge nnual - Limit Group Organ Dose (mrem) lnnul 9 Limit (mrem) Max % of Limit 9 - dmin. ny Organ 9 - dmin. Total Body INFNT CHILD THYROID TBODY 3.55E- 8.67E-3.3E+.5E+ 3.5E- 8.5E- 9 - T.Spc. ny Organ INFNT THYROID 3.55E- Receptor: 5 Composite Crit. Receptor - IP Distance:. (meters) Compass Point: N Critical Pathway: Grs/Goat/Milk (GMILK) Major Contributors ( % or greater to total) Nuclide Percentage H-3.9E+ CR-5 6.5E-6 CO-58.lE-4-3 7.9E+ -3 3.3E-3-33.5E+ CS-36 4.E-5 TE-3M.OOE+.5E+. 37E- 9 - T.Spc. Total Body CHILD TBO DY 8.67E-3.5E+ 5.78E- Receptor: 5 Composite Crit. Receptor - IP Distance:. (meters) Compas s Point: N Critical Pathway: Vegetation (VEG) Major Contributors ( % or greater to total) Nuclide Percentage H-3 CR-5 CO-58-3 -3-33 CS-36 TE-3M 9. 97E+. 73E-5 7. 99E-4.44E- 8.75E-4 8.84E-3 8. 3E-3. OOE+ E-.7 7 of 7

Report for: 9 Unit Range - From: To: 4CFR9 URNIUM FUEL CYCLE DOSE REPORT GSEOUS DOSE SUMMRY 9 Unit NG DOSE LIMIT NLYSIS NNUL 9 Dose Limit nnual - Limit (mrad) (mrad) 9 - dmin. Gamma 8.8E-5 7.5E+ 9 - dmin. Beta 3.8E-4.5E+ Max % of Limit.9E-3.E-3 9 - T.Spc. Gamma 8.8E-5.E+ 8.8E-4 Receptor: 4 Composite Crit. Receptor - NG Distance:. (meters) Compass Point: N Nuclide Percentage R-4 KR-85 XE-38 KR-85M XE-35 XE-33M XE-3M XE-33 4.E+.8E+.76E+ 3.3E- 6.9E+.35E-.3E- 3.6E+ 9 - T.Spc. Beta 3.8E-4.OOE+.59E-3 Receptor: 4 Composite Crit. Receptor - NG Distance:. (meters) Compass Point: N Nuclide Percentage R-4 KR-85 XE-38 KR-85M XE-35 XE-33M XE-3M XE-33 9. 6E- 9. 5E+ 9. OOE- 3. 7E-3 5. 6E- 3. 85E- 5. 55E- 6. 8E+ E-.8 8 of 7

4CFR9 URNIUM FUEL CYCLE DOSE REPORT Report for: 9 Unit Range - From: To: 9 Unit MXIMUM DOSE NLYSIS ge Dose Dose Type Group Organ (mreim) lnnul 9 ny Organ DULT GILLI.85E-OI Liquid Receptor: Liquid Receptor Gaseous Receptor: 5 Composite Crit. Receptor - IP Distance:. (meters) Compass Point: N Liquid Dose: Critical Pathway: Major Contributors Nuclide H-3 MN-54 CO-58 CO-6 NB-95 G-lIOM TE-5M -3 CS-37.8E- % of Fresh Water Fish % or greater Percentage 7. 93E+ 3. 5E- 7. 3E+ 3. 85E+. 9E+ 4.65E-3 8.4E+ 4.E-5.35E- Total: 9.7E+ - Sport (FFSP) to total) Gaseous Dose: Critical Pathway: Major Contributors Nuclide H-3 CR-5 CO-58-3 -3-33 CS-36 TE-3M 5.5E-3 % of Total:.84E+ Vegetation (VEG) % or greater to total) Percentage 9.99E+.44E-4.94E-3 6.87E-.7E-3.9E-.7E-3.OOE+ MXIMUM DOSE NLYSIS -------------- NNUL 9 ge Dose Dose Type Group Organ (mrem) Total Body DULT TBODY.5E- Liquid Receptor: Liquid Receptor Gaseous Receptor: 5 Composite Crit. Receptor - IP Distance:. (meters) Compass Point: N E-.9 9 of 7

4CFR9 URNIUM FUEL CYCLE DOSE REPORT Liquid Dose: Critical Pathway: Major Contributors Nuclide H-3 MN-54 CO-58 CO-6 NB-95 G-IOM TE-5M -3 CS-37 Gaseous Dose: Critical Pathway: Major Contributors Nuclide H-3 CR-5 CO-58-3 -3-33 CS-36 TE-3M.46E- % of Total: 9.67E+ Fresh Water Fish - Sport (FFSP) % or greater to total) Percentage 9.76E+. 49E- 9. 58E- 5.57E-. 8E-4 8.33E-6 3. 48E-. E-4 5. 63E- 5.6E-3 % of Total: 3.48E+ Vegetation (VEG) % or greater to total) Percentage 9.98E+ 4. 36E-5 9. 88E-4. 45E-. 36E-3 5.53E-3 5. 96E-3.E+ E-. of 7

Table 3.- (cont.) Byron Station Unit One 9 4CFRT9 URNIUM FUEL CYCLE DOSE REPORT LIQUID DOSE SUMMRY Unit 9 Report for: 9 Unit Range - From: To: Liquid Receptor === PERIOD DOSE BY ORGN ND GE GROUP (mrem) NNUL 9 gegrp Bone Liver Thyroid Kidney Lung GI-LLI Skin TB DULT TEEN CHILD INFNT 4.7E-3.46E-.44E-.58E-.43E-.8E-.OOE+ 5.E-3.lIE-.8E-.7E-.7E-.34E-.OOE+ 6.54E-3.3E-.E-.9E-.9E-.9E-.OOE+.34E-5 5.7E- 5.7E- 5.7E- 5.7E- 5.7E-.OOE+.46E-.E-.E- 5.7E- nnual - SITE DOSE LIMIT NLYSIS Limit ge Group Organ ----- NNUL 9 Dose Limit (mrem) (mrem) Max % of Limit 9 - dmin. ny Organ 9 - dmin. Total Body DULT DULT GILLI TBODY.8E-.46E- 7.5E+.5E+.4E+ 6. 49E+ 9 - T.Spc. ny Organ DULT GILLI Critical Pathway: Fresh Water Fish -. Sport (FFSP) Major Contributors ( % or greater to total) Nuclide Percentage.8E-.OOE+.8E+ H-3 7.93E+ MN-54 3.5E- CO-58 7.3E+ CO-6 3.85E+ NB-95.9E+ G-OM 4.65E-3 TE-5M 8.4E+ -3 4.E-5 CS-37.35E- 9 - T.Spc. Total Body DULT TBODY Critical Pathway: Fresh Water Fish.- Sport (FFSP) Major Contributors (% or greater to total) Nuclide Percentage.46E- 3.OOE+ 4.87E+ H-3 9.76E+ MN-54.49E- CO-58 9.58E- CO-6 5.57E- NB-95.8E-4 G-OM 8.33E-6 TE-5M 3.48E- -3.E-4 CS-37 5.63E- E-I. of 7

Table 3.- (cont.) Byron Station Unit Two 9 4CFR9 URNIUM FUEL CYCLE DOSE REPORT LIQUID DOSE SUMMRY Unit 9 Report for: 9 Unit Range - From: To: PERIOD DOSE BY ORGN ND GE GROUP (mrem)-------- gegrp Bone Liver Thyroid Kidney Lung Liquid Receptor NNUL 9 GI-LLI Skin TB DULT TEEN CHILD INFNT 4.7E-3.46E-.44E-.58E-.43E- 5.E-3.lIE-.8E-.7E-.7E- 6.54E-3.3E-.E-.9E-.9E-.34E-5 5.7E- 5.7E- 5.7E- 5.7E-.8E-.OOE+.46E-.34E-.E+.E-.9E-.OOE+.E- 5.7E-.OOE+ 5.7E- SITE DOSE LIMIT NLYSIS-------- g e nnual - Limit Gr oup 9 - dmin. ny Organ DiULT 9 - dmin. Total Body DIULT NNUL 9 Dose Limit Organ (mrem) (mrem) GILLI.8E- 7.5E+ TBODY.46E-.5E+ Max % of Limit.4E+ 6.49E+ 9 - T.Spc. ny Organ DULT GILLI Critical Pathway: Fresh Water Fish - Sport (FFSP) Major Contributors ( % or greater to total) Nuclide Percentage.8E-.OOE+.8E+ H-3 7.93E+ MN-54 3.5E- CO-58 7.3E+ CO-6 3.85E+ NB-95.9E+ G-OM 4.65E-3 TE-5M 8.4E+ -3 4.E-5 CS-37.35E- 9 - T.Spc. Total Body DULT TBODY Critical Pathway: Fresh Water Fish - Sport (FFSP) Major Contributors ( % or greater to total) Nuclide Percentage.46E- 3.OOE+ 4.87E+ H-3 9.76E+ MN-54.49E- CO-58 9.58E- CO-6 5.57E- NB-95.8E-4 G-OM 8.33E-6 TE-5M 3.48E- -3.E-4 CS-37 5.63E- E-. of 7

Table 3.4- Byron Station - Unit I MXIMUM DOSES RESULTING FROM IRBORNE RELESES 9 TYPE OF DOSE FIRST QURTER SECOND QURTER THIRD QURTER FOURTH QURTER NNUL GMM IR (mrad) BET IR (mrad) WHOLE BODY (mrem) SKIN (mrem) ORGN (mrem).39e-6(sse) 7.E-6(SSE) 6.6E-7( SE).87E-6(SSE) 4.5E-5(SSE).OOOE-6( SE) 6.46E-6(ESE).5E-6( SE) 3.E-6( SE) 5.5E-4(ESE) 4.63E-6. 58E-5.4E-6 8. 86E-6. 77E-4 W) SE) SE) SE) SE) 4.E-6( W) 4.9E-4( W) 7.9E-7( S).3E-4(WNW).E-4( W).76E-5( W) 4.6E-4( W) 4.88E-6( SE).375E-4(WNW) 8.97E-4(ESE) CRITICL PERSON CRITICL ORGN Teenager Liver Teenager Liver Teenager Thyroid Teenager Thyroid Teenager Thyroid COMPLINCE STTUS TYPE OF DOSE CFR 5 PP. I CFR 5 PP.I QURTERLY OBJECTIVE % OF PP. I YERLY OBJECTIVE % OF PP. I GMM IR (mrad) BET IR (mrad) WHOLE BODY (mrem) SKIN (mrem) ORGN (mrem) 5...5 7.5 7.5....... 5. 5. 5...... CRITICL PERSON CRITICL ORGN Teenager Liver Teenager Thyroid Calculation used release data from the following: Unit - Vent Date of calculation: /9/ Data Recovery (priority parameters) 99.8% E-. 3 3 of 7

Table 3.4- Byron Station - Unit MXIMUM DOSES RESULTING FROM IRBORNE RELESES 9 TYPE OF DOSE FIRST QURTER SECOND QURTER THIRD QURTER FOURTH QURTER NNUL GMM IR (mrad) BET IR (mrad) WHOLE BODY (mrem) SKIN (mrem) ORGN (mrem).67e-6 SSE) 4.94E-6(SSE) 8.53E-7( SE) 96E-6(SSE).49E-4(SSE) 9.37E-7( SE) 3.57E-6(ESE) 4.79E-7( SE).58E-6( SE) 9.64E-5(ESE).75E-6). 4E-5. 7E-6( 6. E-6 4. 95E-4 W) SE) SE) SE) SE) 4.E-6( W).3E-5( W).86E-6( SE) 6.6E-6(WNW).5E-4( W) 8.559E-6)(ESE).564E-5(ESE) 4.89E-6( SE).48E-5( SE) 7.996E-4( SE) CRITICL PERSON CRITICL ORGN Teenager Liver Teenager Liver Teenager Thyroid Teenager Thyroid Teenager Thyroid COMPLINCE STTUS TYPE OF DOSE CFR 5 PP. I CFR 5 PP.I QURTERLY OBJECTIVE % OF PP. I YERLY OBJECTIVE OF PP. I GMM IR (mrad) BET IR (mrad) WHOLE BODY (mrem) SKIN (mrem) ORGN (mrem) 5...5 7.5 7.5....... 5. 5. 5...... CRITICL PERSON CRITICL ORGN Teenager Thyroid Teenager Thyroid Calculation used release data from the following: *Unit - Vent Date of calculation: /9/ Data Recovery (priority parameters) 99.8% E-. 4 4 of 7

PPENDIX F METEOROLOGICL DT 5 of 7

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Byron Generating Station Period of Record: January - March 9 Stability Class - Extremely Unstable - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-I 7 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Moderately Unstable - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 5 8 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F- 8 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Slightly Unstable - 5Ft-3OFt Delta-T (F) Winds Measured at 3 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 8 3 34 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-3 9 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Neutral -. 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 4-7 Wind Speed (in 8-3-8 mph) 9-4 > 4 Total N 3 43 8 94 NNE 6 36 63 NE 8 9 8 ENE 4 9 6 E 4 6 7 38 ESE 3 9 8 8 49 SE 6. 9 39 SSE 6 5 6 95 S 5 9 8 6 7 SSW 3 8 3 7 5 SW 3 7 6 7 63 WSW 5 8 47 W 7 36 35 6 i5 WNW 35 73 37 3 5 NW 34 6 3 7 NNW 7 68 37 4 Variable 3 5 Total 6 56 56 3 49 7 75 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-4 3 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Slightly Stable - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N 4 4 3 NNE 6 4 3 3 NE 3 9 3 ENE 3 3 8 E 5 3 4 ESE 4 6 36 SE 7 4 6 69 SSE 5 36 3 64 S 9 8 5 54 SSW 4 5 4 SW 6 4 WSW 6 3 3 34 W 8 38 35 9 WNW 8 8 57 NW 37 9 66 NNW 4 35 3 6 Variable Total 6 86 7 77 6 7 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-5 3 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Moderately Stable - 5Ft-3OFt Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E 3 5 8 ESE 6 5 3 SE 9 3 3 SSE S 3 4 3 5 9 SSW 9 SW 3 5 WSW 3 4 W 6 7 3 WNW 5 3 8 NW 5 6 NNW 8 9 Variable Total 7 89 3 5 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability class: stability measurements in all stability classes: 3 F-6 3 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Extremely Stable - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE 9 3 SE SSE 3 S SSW 3 SW 4 4 WSW W WNW NW 3 3 NNW 3 3 Variable Total 3 33 54 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-7 33 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Extremely Unstable - 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable. Total Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-8 34 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Moderately Unstable -. 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7.8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 3 3 8 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-9 35 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Slightly Unstable - 5 Ft-3Ft Delta-T (F) Winds Measured at 5 Feet Wind Direction -3 Wind Speed (in mph 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 8 3 34 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F- 36 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Neutral - 5Ft-3Ft Delta-T (F) Winds Measured at 5 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N 5 34 7 7 85 NNE 7 7 34 8 67 NE 6 7 9 7 ENE 4 3 7 E 4 6 7 4 ESE 6 9 4 4 SE 6 4 3 8 43 SSE 4 36 6 5 93 S 7 4 6 3 7 67 SSW 3 3 9 56 SW 9 4 6 8 68 WSW 5 8 5 3 43 W 3 3 35 ill WNW 4 5 36 4 43 NW 35 5 9 6 33 NNW 5 8 4 8 5 Variable 3 4 Total 7 7 95 374 68 83 54 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-I 37 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Slightly Stable - 5Ft-3Ft Delta-T (F) Winds Measured at 5 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N 5 4 9 NNE 4 8 5 NE 3 7 3 5 ENE 3 5 5 E 8 8 7 39 ESE 4 5 5 SE 8 9 4 66 SSE 8 4 55 S 6 8 8 64 SSW 5 48 SW 6 4 7 6 35 WSW 7 8 5 33 W 8 47 3 8 WNW 4 4 6 NW 43 7 NNW 6 4 8 69 Variable Total 6 43 37 344 4 77 7 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F- 38 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Moderately Stable - 5Ft-3OFt Delta-T (F) Winds Measured at 5 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N 5 6 NNE NE ENE E 3 7 ESE 6 9 SE 6 3 SSE 5 6 3 S 3 7 8 4 SSW 3 5 SW 7 3 WSW 6 8 W, 5 7 WNW 3 5 8 NW 5 5 NNW 3 6 Variable Total 5 49 63. 8 5 5 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability class: stability measurements in all stability cl asses: 3 F-3 39 of 7

Byron Generating Station Period of Record: January - March 9 Stability Class - Extremely Stable -. 5Ft-3OFt Delta-T (F) Winds Measured at 5 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE 4 NE ENE E ESE SE 4 9 SSE 3 3 S 6 SSW 3 6 SW WSW W WNW NW NNW Variable Total 4 8 8 54 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F- 4 4 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Extremely Unstable - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 4 8 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-5 4 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Moderately Unstable - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Speed (in mph) Wind Direction -3 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 6 3 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-6 4 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Slightly Unstable - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 9 34 33 8 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-7 43 of 7

Byron Generating Station Period of.record: pril - June 9 Stability Class - Neutral - 5Ft-3OFt Delta-T (F) Winds Measured at 3 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N 4 6 6 6 6 NNE 5 9 3 3 7 NE 6 3 3 5 5 7 ENE 6 5 5 3 E 4 3 46 8 ESE 6 7 37 SE 4 8 35 SSE 9 7 6 43 S 4 7 7 4 43 SSW 6 7 3 58 SW 5 8 WSW 4 6 6 6 55 W 3 7 4 4 68 WNW 34 55 36 7 NW 9 35 46 37 8 NNW 3 3 4 69 Variable Total 48 33 434 57 6 79 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-8 44 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Slightly Stable -. 5Ft-3OFt Delta-T (F) Winds Measured at 3 Feet Wind Speed (in mph) Wind Direction -3 4-7 8-3-8 9-4 > 4 Total N 4 8 4 NNE 6 9 9 34 NE 6 3 6 36 ENE 3 3 6 E 6 5 3 69 ESE 4 8 3 45 SE 5 9 SSE 8 8 9 38 S 4 5 43 6 69 SSW 9 5 3 49 SW 8 9 4 3 4 WSW 6 3 5 6 W 7 33 5 WNW 4 9 3 47 NW 3 7 6 6 NNW 3 7 8 Variable Total 78 6 45 58 5 649 Hours of calm in this stability class: 3 Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-9 45 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Moderately Stable - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-.4 > 4 Total N 7 5 NNE 3 3 6 NE 3 4 ENE 6 E 4 7 ESE 3 7 SE 4 SSE 5 8 7 3 S 6 7 5 SSW 5 5 SW 4 5 9 WSW 4 5 W 7 9 WNW 5 6 NW 9 NNW 6 8 4 Variable Total 99 3 5 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 4 stability class: all stability classes: 3 F- 46 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Extremely Stable - 5Ft-3OFt Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE 4 E 3 5 ESE 3 5 SE 4 5 SSE 8 S 4 9 4 SSW 4 5 SW WSW 3 3 W 3 3 WNW 6 6 NW 4 4 NNW Variable Total 3 3 6 69 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability measurements in 3 stability class: all stability classes: 3 F- 47 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Extremely Unstable - 5Ft-3Ft Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F- 48 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Moderately Unstable - 5Ft-3OFt.Delta-T (F) Winds Measured at 5 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N NNE 3 4 NE ENE. E 4 6 ESE 3 SE SSE S SSW SW WSW W WNW 3 NW 5 8 NNW Variable " Total 4 5 9 3 Hours of calm in this stability class: Hours of missing wind measurements in this Hours of missing stability measurements in stability all stability class: cl asses: 3 F-3 49 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Slightly Unstable - 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7. 8-3-8 9-4 > 4 Total N NNE 4 NE 7 ENE 4 E 7 3 ESE 3 4 SE 3 SSE b " S SSW 6 7 SW WSW 3 W 5 WNW 3 7 NW 5 8 NNW 5 Variable Total 5 3 4 7 8 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability class: stability measurements in all stability classes: 3 F-4 5 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Neutral - 5Ft-3Ft Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE 8 4 3 8 8 9 9 46 3 7 NE 5 6 5 6 7 7 ENE 4 3 7 86 E 3 7 5 39 9 ESE 3 8 43 SE 8 7 5 3 34 SSE 5 3 3 4 36 S 6 6 44 SSW 7 4 3 59 SW 7 7 8 36 WSW 3 7 9 6 8 44 W 3 8 64 WNW NW 5 7 3 3 3 33 5 4 9 57 NNW 3 9 74 Variable Total 3 69 9 33 99 59 79 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-5 5 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Slightly Stable - 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N 5 7 NNE 3 7 8 8 NE 6 8 6 4 ENE 3 9 5 E 3 9 9 5 54 8 ESE 4 8 3 5 4 SE 4 7 6 39 SSE 6 9 4 6 37 S 8 7 7 54 SSW 6 5 5 SW 3 7 6 36 WSW 5 5 6 W 3 9 3. 53 WNW 3 5 5 45 NW 5 6 33 NNW 5 Variable Total 4 66 8 44 7 3 65 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-6 5 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Moderately Stable - 5Ft-3Ft Delta-T (F) Winds Measured at 5 Feet Wind Speed (in mph) Wind Direction -3 4-7 8-3-8 9-4 > 4 Total N 6 8 NNE 4 6 NE 6 3 ENE 5 6 E 4 5 3 ESE 3 8 5 8 SE 6 6 3 SSE 4 8 9 3 S 7 SSW 6 4 6 SW 4 WSW 3 8 4 W 6 9 5 WNW 3 7 6 6 NW 4 8 8 NNW 8 Variable Total. 33 8 99 3 53 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-7 53 of 7

Byron Generating Station Period of Record: pril - June 9 Stability Class - Extremely Stable - 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 4-7 Wind Speed (in mph) 8-3-8 9-4 > 4 Total N NNE NE ENE 3 E 3 3 ESE 3 7 SE 3 3 3 9 SSE 3 5 S 7 8 SSW 6 9 SW 3 5 WSW 5 W 3 WNW 3 3 NW 6 NNW 3 Variable Total 34 7 7 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-8 54 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Extremely Unstable - 5Ft-3OFt Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 4 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-9 55 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Moderately Unstable - 5Ft-3OFt Delta-T (F) Winds Measured at 3 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 7 9 7 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-3 56 of 7

Byron Generating Station Period of Record: July - Stability Class - Slightly Unstable Winds Measured at September 9-5Ft-3Ft Delta-T 3 Feet (F) Wind Direction -3 4-7 Wind Speed (in mph) 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 4 7 5 3 3. 5 7 5 5 8 5 6 9 3 3 6 Total 43 35 8 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-3 57 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Neutral - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Speed (in mph) Wind Direction -3 4-7 8-3-8 9-4 > 4 Total N 34 5 59 NNE 5 8 NE 5 7 6 8 ENE 3 5 39 E 7 4 8 67 ESE 7 7 4 8 SE 7 48 SSE 4 5 3 S 4 8 9 3 SSW 5 3 3 6 54 SW 7 6 3 47 WSW 7 8 9 56 W 8 7 9 6 5 WNW 9 45 3 7 5 7 NW 5 47 33 96 NNW 39 73 Variable Total 44 37 7 4 5 835 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-3 58 of 7

Byron Generating Station Period of Record: July - Stability Class - Slightly Stable Winds Measured at September 9-5Ft-3OFt 3 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N 4 5 NNE i 3 4 NE 8 7 35 ENE 9 6. 47 E 6 36 3 55 ESE 5 4 3 3 SE 6 5 43 SSE 6 8 9 44 S 7 3 5 54 SSW 6 3 8 49 SW 7 4 43 WSW 5 4 3 4 W 34 5 WNW 3 6 3 43 NW 8 8 4 4 NNW 6 5 3 Variable 3 3 Total 63 36 6 65 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-33 59 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Moderately Stabl le - 5Ft-3OFt Delta-T (F) Winds Measured at 3 Feet Wind Direction -3 4-7 Wind Spee d (in mph) 8-3-8 9-4 > 4 Total N 5 6 NNE 4 6 NE 6 8 ENE 5 7 E 39 6 ESE 4 4 SE 4 4 8 SSE 7 3 S 7 9 SSW 4 6 SW 6 7 WSW 3 W 3 4 7 WNW 3 3 6 NW 6 6 NNW 5 6 Variable Total 8 65 3 349 Hours of calm in this stability class: 9 Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-34 6 of 7

Byron Generating Station Period of Record: July - Stability Class - Extremely Stable Winds Measured at September 9-5Ft-3OFt Delta-T (F) 3 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N 5 6 NNE 5 5 NE 4 4 ENE 6 6 E 4 6 ESE 6 4 SE 6 5 SSE 6 6 S 5 7 SSW 8 SW 7 7 WSW 6 6 W WNW 3 3 NW 35 35 NNW Variable Total 8 47 7 Hours of calm in this stability class: Hours of missing wind measurements in-this stability class: Hours of missing stability measurements in. all stability classes: 3 F-35 6 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Extremely Unstable - 5Ft-3Ft Delta-T (F) Winds Measured at 5 Feet Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-36 6 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Moderately Unstable - 5Ft-3Ft Delta-T (F) Winds Measured at 5 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 4 7 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-37 63 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Slightly Unstable - 5Ft-3Ft Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W ' WNW 3 NW NNW 6 Variable Total 4. 3 8 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-38 64 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Neutral - 5Ft-3Ft Delta-T (F) Winds Measured at 5 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N 5 7 6 NNE 3 7 35 NE 4 6 ENE 9 7 8 6 E 33 8 4 77 ESE 6 3 36 SE 7 7 45 SSE i 6 33 S 8 4 SSW 7 6 56 SW 5 5 6 43 WSW 4 9 6 5 W 4 45 WNW 4 6 NW 5 48 5 NNW 6 37 3 73 Variable Total 67 6 75 89 63 5 835 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: 3 F-39 65 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Slightly Stable - 5Ft-3Ft Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total 4 3 9 NNE 4 3 8 NE 3 3 8 ENE 3 7 5 9 54 E 3 8 5 8 3 68 ESE 3 9 9 7 9 SE 7 7 5 3 SSE 5 8 38 S 8 9 8 38 SSW 6 6 4 69 SW 9 9 8 38 WSW 7 3 4 W 6 6 6 4 WNW 3 8 9 9 3 54 NW 6 9 5 54 NNW 5 4 3 Variable Total 6 Ii 3 64 654 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-4 66 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Moderately Stable - 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N 5 4 NNE 6 4 3 NE 4 6 8 ENE 3 8 3 5 E 9 7 8 56 ESE 3 4 6 SE 4 SSE 3 7 3 S 4 4 5 SSW 3 6 3 SW 8 5 8 WSW 6 5 5 6 W 6 3 3 WNW 3 7 NW 6 9 7 NNW 9 5 6 Variable Total 59 38 8 358 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability class: stability measurements in all stability classes: 3 F-4 67 of 7

Byron Generating Station Period of Record: July - September 9 Stability Class - Extremely Stable - 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N 3 5 3 NNE 4 3 9 NE 5 7 3 ENE 6 3 E 5 7 8 3 3 ESE SE SSE S SSW SW WSW W WNW NW NNW Variable 5 5 4 8 7 3 3 ii 5 5 Total 6 64 9 6 47 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: 3 F-4 68 of 7

Byron Generating Station Period of Record: October - December 9 Stability Class - Extremely Unstable - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 3 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: F-43 69 of 7

Byron Generating Station Stability Period of Record: October - December 9 Class - Moderately Unstable -. 5Ft-3Ft Winds Measured at 3 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 5 4 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability class: stability measurements in all stability classes: F-44 7 of 7

Byron Generating Station Stability Period of Record: October - December 9 Class - Slightly Unstable - 5Ft-3Ft Winds Measured at 3 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 7 5 4 36 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stabili ty class: stability measurements in all stability classses: F-45 7 of 7

Byron Generating Station Period of Record: October - December 9 Stability Class - Neutral - 5Ft-3Ft Delta-T (F) Winds Measured at 3 Feet Wind Speed (in mph) Wind Direction -3 4-7 8-3-8 9-4 > 4 Total N 9 5 9 73 NNE 8 9 NE 4 3 45 ENE 7 6 48 E 54 44 7 3 ESE 46 SE 8 6 48 SSE 7 6 S 33 73 SSW 4 34 i 66 SW 3 8 4 55 WSW 37 7 7 93 W 48 4 45 44 WNW 7 67 9 NW 8 39 74 NNW 5 37 6 6 Variable Total 55 35 497 5 39 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: F-46 7 of 7

Byron Generating Station Stability Period of Record: October Class - Slightly Stable Winds Measured at - December 9-5Ft-3Ft Delta-T (F) 3 Feet Wind Speed (in mph) Wind Direction -3 4-7 8-3-8 9-4 > 4 Total N 5 8 5 NNE 7 3 NE 5 6 3 36 ENE 6 7 37 E 7 5 ESE 8 7 5 53 SE 5 33 3 8 78 SSE 8 44 3 87 S 8 33 8 8 SSW 3 3 5 9 6 SW 7 8 8 44 WSW 7 8 5 5 W 9 5 39 WNW 7 7 8 4 NW 7 NNW 3 7 Variable Total 9 33 35 8 6 744 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: F-47 73 of 7

Byron Generating Station Period of Record: October - December 9 Stability Class - Moderately Stable - 5Ft-3OFt Delta-T (F) Winds Measured at 3 Feet Wind Direction Wind Speed (in mph) -3 4-7 8-3-8 9-4 > 4 Total N 3 3 NNE 3 4 NE ENE 3 5 8 E 8 9 ESE 4 8 4 SE 3 7 39 SSE 4 6 S 5 9 8 3 SSW 6 3. SW 6 6 WSW 6 6 W 8 8 WNW 3 3 NW 4 NNW 4 Variable Total 57 3 88 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes.: F-48 74 of 7

Byron Generating Station Stability Period of Record: October Class - Extremely Stable Winds Measured at - December 9-5Ft-3Ft 3 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N 6 7 NNE NE ENE 4 E 6 ESE SE SSE S SSW SW WSW W WNW NW NNW 5 5 9 4 Variable Total 9 6 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in 4 stability class: all stability classes: F-49 75 of 7

Byron Generating Station Stability Period of Record: October - December 9 Class - Extremely Unstable - 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 3 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability class: stability measurements in all stability classes: F-5 76 of 7

Byron Generating Station Period of Record: October - December 9 Stability Class - Moderately Unstable - 5Ft-3Ft Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 7 3 Hours of calm in this stability class: Hours of missing wind measurements in this stability class: Hours of missing stability measurements in all stability classes: F-5 77 of 7

Byron Generating Station Stability Period of Record: October - December 9 Class - Slightly Unstable - 5Ft-3Ft Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW Variable Total 5 6 3 336 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: F-5 78 of 7

Stability Byron Generating Station Period of Record: October - December 9 Class - Neutral - 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N 3 7 34 5 6 NNE 6 3 4 NE 4 9 6 3 4 ENE 3 8 54 E 4 5 44 8 9 ESE 6 5 4 4 SE 4 4 4 6 5 SSE 5 7 8 7 5 S SSW 3 7 4 4 5 3 4 69 68 SW ' 6 5 9 5 67 WSW 6 9 6 64 W WNW 37 5 39 9 46 5 54 5 4 NW 9 6 59 8 4 NNW 6 7 8 4 57 Variable Total 7 37 35 43 7 45 8 Hours of Hours of Hours of calm in missing missing this stability class: wind measurements in this stability measurements in stability class: 3 all stability classes: F-53 79 of 7

Byron Generating Station Stability Period of Record: October - December 9 Class - Slightly Stable -. 5Ft-3OFt Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N 4 7 NNE 4 8 NE 9 7 4 3 ENE 3 9 8 9 4 44 E 9 7 3 4 ESE 6 6 8 5 47 SE SSE 3 5. 8 3 8 36 8 75 9 8 S 6 3 4 7 SSW 4 6 6 36 5 88 SW 4 6 8 8 4 5 WSW 6 6 3 37 W 8 5 4.8 WNW 7 8 39 NW 3 3 3 39 NNW 4 4 9 9 Variable Total 9 6 48 64 5 744 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: F-54 8 of 7

,Byron Generating Station Stability Period of Record: October - December 9 Class - Moderately Stable - 5Ft-3Ft Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 974 > 4 Total N 3 6 NNE NE 4 5 ENE E 6 5 ESE 7 8 SE 5 6 4 SSE 4 6 S 3 5 7 5 SSW 4 9 7 SW 5 7 3 5 WSW 9. W 9 WNW 3 NW 7 8 NNW 4 7 Variable Total 6 6 64 45 9 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: F-55 8 of 7

Byron Generating Station Stability Period of Record: October - December 9 Class - Extremely Stable - 5Ft-3Ft Winds Measured at 5 Feet Delta-T (F) Wind Direction -3 Wind Speed (in mph) 4-7 8-3-8 9-4 > 4 Total N NNE 4 NE 5 ENE 4 E 8 ESE 5 SE 3 SSE S 5 SSW 5 SW 4 WSW 3 W 3 WNW NW NNW Variable Total 9 3 8 5 7 64 Hours of calm in Hours of missing Hours of missing this stability class: wind measurements in this stability measurements in stability class: all stability classes: F-56 8 of 7

PPENDIX G NNUL RDIOLOGICL GROUNDWTER PROTECTION PROGRM REPORT (RGPPR) 83 of 7

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Docket No: 5-454 5-455 BYRON NUCLER GENERTING STTION UNITS and nnual Radiological Groundwater Protection Program Report January Through 3 December 9 Prepared By Teledyne Brown Engineering Environmental Services Nuclear Byron Nuclear Generating Station Byron, IL 6 May 85 of 7

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Table Of Contents I. Summary and Conclusions... I. Introduction... 4. O bjectives of the RG PP... 4 B. Im plem entation of the O bjectives... 4 C. Program Description... 5 D. Characteristics of Tritium (H-3)... 6 Il. Program Description... 6. Sam ple nalysis... 6 B. Data Interpretation... 7 C. Background nalysis... 8. Background Concentrations of Tritium... 8 IV. Results and discussion.... G roundwater Results... B. Drinking W ater W ell Survey... C. Summary of Results - Inter-laboratory Comparison Program... D. Leaks, Spills, and Releases... E. Trends... F. Investigations... G. ctions Taken... 87 of 7

ppendices ppendix Tables Table -: Location Designation Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 9 Fiqures Figure -: Monitoring Well Locations, Byron Nuclear Generating Station, 9 (Extra wells noted on map are for reference only.) ppendix B Tables Table B-. Table B-. Data Tables Concentrations of Tritium and Strontium in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Byron Nuclear Generating Station, 9. ii 88 of 7

I. Summary and Conclusions In 6, Exelon instituted a comprehensive monitoring program to evaluate the impact of station operations on groundwater in the vicinity of Byron Nuclear Generating Station. The monitoring was conducted in two phases. Phase of the monitoring was part of a comprehensive study initiated by Exelon to determine whether groundwater or surface water at and in the vicinity of Byron Nuclear Generating Station had been adversely impacted by any releases of radionuclides. Phase was conducted by Conestoga Rovers and ssociates (CR) and the conclusions were made available to state and federal regulators as well as the public. Phase of the RGPP was conducted by Exelon corporate and station personnel to initiate follow up of Phase and begin long-term monitoring at groundwater locations selected during Phase. This is the third in a series of annual reports on the status of the Radiological Groundwater Protection Program (RGPP) conducted at Byron Nuclear Generating Station. This report covers groundwater samples, collected from the environment, both on and off station property in 9. During that time period, 6 analyses were performed on 6 samples from 3 locations. In accordance with Byron's Radiological Groundwater Protection Program, gamma-emitting radionuclides associated with licensed plant operations were not sampled in 9. In the case of tritium, Exelon specified that its laboratories achieve a lower limit of detection times lower than that required by federal regulation. In 9, the number of Radiological Groundwater Protection Program (RGPP) monitoring wells sampled was reduced from to 3 based on the evaluation and recommendation from an environmental consulting firm. The 9 wells removed from the sampling program in 9 had not tested positive for tritium since the program began in 6 and were determined to be low risk for contamination based on their locations commensurate with local hydrogeology. Tritium was not detected in any of the groundwater samples at concentrations greater than the United States Environmental Protection gency (USEP) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of, pci/l. Low levels of tritium were detected at concentrations greater than the LLD of pci/l in two of 3 groundwater sample locations. The tritium concentrations in these two monitoring wells ranged from, ± 57 pci/l to,36 ± 87 pci/l. These two monitoring wells (R-4 & R- ) are located near Circ Water Blowdown vaults (3 & 4) along the blowdown line located west of the station, where historical leakage through vacuum breakers was known to have occurred. Well R-4 has shown an overall decrease in - - 89 of 7

tritium concentration since first sampled in 6. Well R- has shown an overall decrease in tritium concentration since first sampled in 6 and a slight decrease from 8. In assessing all the data gathered for this report, it was concluded that the operation of Byron Nuclear Generating Station had no adverse radiological impact on the environment, and there are no known active releases into the groundwater at Byron Nuclear Generating Station. -- 9 of 7

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II. Introduction The Byron Station, a two-unit PWR station, is located about two miles east of the Rock River and approximately three miles southwest of Byron in Ogle County, Illinois. The reactors are designed to have capacities of 8 and 54 MW gross, respectively. Unit One loaded fuel in November 984 and went on line February, 985. Unit Two went on line January 9, 987. This report covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 9.. Objectives of the RGPP The long-term objectives of the RGPP are as follows:. Identify suitable locations to monitor and evaluate potential impacts from station operations before significant radiological impact to the environment and potential drinking water sources.. Understand the local hydrogeologic regime in the vicinity of the station and maintain up-to-date knowledge of flow patterns on the surface and shallow subsurface. 3. Perform routine water sampling and radiological analysis of water from selected locations. 4. Report new leaks, spills, or other detections with potential radiological significance to stakeholders in a timely manner. 5. Regularly assess analytical results to identify adverse trends. 6. Take necessary corrective actions to protect groundwater resources. B. Implementation of the Objectives The objectives identified have been implemented at Byron Nuclear Generating Station as discussed below:. Exelon and its consultant identified locations as described in the Phase study. Phase studies were conducted by Conestoga Rovers and ssociates (CR) and the results and conclusions were made available to state and federal regulators as well as the public. -4-9 of 7

. The Byron Nuclear Generating Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements. 3. Byron Nuclear Generating Station will continue to perform routine sampling and radiological analysis of water from selected locations. 4. Byron Nuclear Generating Station has implemented new procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner. 5. Byron Nuclear Generating Station staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends. C. Program Description. Sample Collection Sample locations can be found in Table -- and Figure -I, ppendix. Groundwater Samples of water are collected, managed, transported and analyzed in accordance with approved procedures following EP methods. Only groundwater is collected. Sample locations, sample collection frequencies and analytical frequencies are controlled in accordance with approved station procedures. Contractor and/or station personnel are trained in the collection, preservation management, and shipment of samples, as well as in documentation of sampling events. nalytical laboratories are subject to internal quality assurance programs, industry crosscheck programs, as well as nuclear industry audits. Station personnel review and evaluate all analytical data deliverables as data are received. nalytical data results are reviewed by both station personnel and an independent hydrogeologist for adverse trends or changes to hydrogeologic conditions. -5-93 of 7

D. Characteristics of Tritium (H-3) Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The most common form of tritium is tritium oxide, which is also called "tritiated water." The chemical properties of tritium are essentially those of ordinary hydrogen. Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food, or absorption through skin. Once tritium enters the body, it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 4 days. Within one month or so after ingestion, essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period. Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotopes lithium-7 and/or boron- are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like nontritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity. Tritium has a half-life of approximately.3 years. It decays spontaneously to helium-3 (3He). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium is one of the least dangerous radionuclides because it emits very weak radiation and leaves the body relatively quickly. Since tritium is almost always found as water, it goes directly into soft tissues and organs. The associated dose to these tissues is generally uniform and is dependent on the water content of the specific tissue. Ill. Program Description. Sample nalysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the Byron Nuclear Generating Station RGPP in 9. -6-94 of 7

In order to achieve the stated objectives, the current program includes the following analyses:. Concentrations of gamma emitters in groundwater (as required by procedure).. Concentrations of strontium in groundwater (as required by procedure). 3. Concentrations of tritium in groundwater. B. Data Interpretation The radiological data collected prior to Byron Nuclear Generating Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Byron Nuclear Generating Station was considered operational at initial criticality. Several factors were important in the interpretation of the data:. Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) is specified by federal regulation as a minimum sensitivity value that must be achieved routinely by the analytical parameter.. Laboratory Measurements Uncertainty The estimated uncertainty in measurement of tritium in environmental samples is frequently on the order of 5% of the measurement value. Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated. Exelon reports the TPU by following the result with plus or minus ± the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements. nalytical uncertainties are reported at the 95% confidence level in -7-95 of 7

this report for reporting consistency with the REOR. C. Background nalysis pre-operational radiological environmental monitoring program (preoperational REMP) was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, marine life, and foodstuffs. The results of the monitoring were detailed in the report entitled, Environmental Radiological Monitoring for Byron Nuclear Generating Nuclear Power Station, Commonwealth Edison Company, nnual Report 984, pril 985. The pre-operational REMP contained analytical results from samples collected from the surface water and groundwater. ll groundwater samples listed in the pre-operational REMP report were pci/l.. Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others. dditional detail may be found by consulting references (CR 6). a. Tritium Production Tritium is created in the environment from naturally occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e., man-made) sources. In the upper atmosphere, "Cosmogenic" tritium is produced from the bombardment of stable nuclides and combines with oxygen to form tritiated water, which will then enter the hydrologic cycle. Below ground, "lithogenic" tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater. major anthropogenic source of tritium and strontium-9 comes from the former atmospheric testing of thermonuclear weapons. Levels of tritium in precipitation increased significantly during the 95s and early 96s, and later with -8-96 of 7

additional testing, resulting in the release of significant amounts of tritium to the atmosphere. The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue to influence tritium concentrations in the environment. b. Precipitation Data Precipitation samples are routinely collected at stations around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEP's RadNet database. GNIP provides tritium precipitation concentration data for samples collected world wide from 96 to 6. RadNet provides tritium precipitation concentration data for samples collected at stations through out the U.S. from 96 up to and including 6. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 963. This peak, which approached, pci/l for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below pci/l since around 98. Tritium concentrations in wells may still be above the pci/l detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 96s that was elevated in tritium. c. Surface Water Data Tritium concentrations are routinely measured in large surface water bodies, including Lake Michigan and the Mississippi River. Illinois surface water data were typically less than pci/l. The USEP RadNet surface water data typically has a reported 'Combined Standard Uncertainty' of 35 to 5 pci/l. ccording to USEP, this corresponds to a ± 7 to pci/l 95% confidence bound on each given measurement. Therefore, the typical background data provided may be subject to measurement uncertainty of approximately ± 7 to -9-97 of 7

pci/l. The radio-analytical laboratory is counting tritium results to an Exelon specified LLD of pci/l. Typically, the lowest positive measurement will be reported within a range of 4-4 pci/l or 4 ± pci/l. Clearly, these sample results cannot be distinguished as different from background at this concentration. IV. Results and Discussion. Groundwater Results Groundwater Samples were collected from on and off-site wells throughout the year in accordance with the station radiological groundwater protection program. nalytical results and anomalies are discussed below. Tritium Samples from all locations were analyzed for tritium activity (Table B-l., ppendix B). Tritium values ranged from less than the detection limit to,36 pci/i. Within the station boundary, concentrations of tritium at the bottom of the Galena-Platteville aquifer ranged from, -,36 pci/l. Outside of the station boundary, tritium concentrations were all less than detection limit ( pci/l). This is based on evaluation of groundwater sample results obtained as part of the Byron Station REMP. Of the thirteen wells sampled in 9, two contained levels of tritium above the lower limit of detection (LLD) of pci/l. They were: R-4 (,35 and,36 pci/l), and R- (, &, pci/l). Well R-4 has shown an overall decrease in tritium concentration since first sampled in 6. Well R- has shown an overall decrease in tritium concentration since first sampled in 6 and a slight decrease from 8. The tritium detected in groundwater samples has been isolated to the Galena-Platteville aquifer, which is isolated from the deeper regional groundwater aquifer by the semi-confining Glenwood Formation. Groundwater quality data from production wells and monitoring wells at the station located below this aquifer do not indicate concentrations of tritium greater than the LLD of pci/l. s such, the tritium impact is limited to the Galena-Platteville aquifer. - - 98 of 7

Strontium Strontium-9 was not analyzed in 9. Gamma Emitters Gamma-emitting radionuclides associated with licensed plant operations were not analyzed in 9. B. Drinking Water Well Survey No drinking water well surveys were conducted in 9. C. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE are presented in the REOR. D. Leaks, Spills, and Releases There are no new previously unidentified leaks or plumes at Byron Station. There have been no new leaks, spills or releases at Byron Station in 9. E. Trends Well R-4 has shown an overall decrease in tritium concentration since first sampled in 6. Well R- has shown an overall decrease in tritium concentration since first sampled in 6 and a slight decrease from 8. F. Investigations No investigations were initiated in 9 due to anomalous sample results. G. ctions Taken. Compensatory ctions No compensatory actions were initiated in 9.. Installation of Monitoring Wells No new monitoring wells were installed in 9. -I - 99 of 7

3. ctions to Recover/Reverse Plumes No actions were undertaken to recover/reverse plumes in 9. -- of 7

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TBLE -: Radiological Groundwater Protection Program - Sampling Locations, Distance and Direction, Byron Nuclear Generating Station, 9 Site Site Type Temporary/Permanent Distance and Direction R- R- R- R- R-3 R-4 R-5 R-6 R-7 R-8 R-9 CR- CR- CR-3 DF-4 (EP well) GW-9 MW- (EP well) MW-3 (EP well) TW-3 TW-4 TW-5 Well 7 Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Monitoring Well Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent Permanent.36 miles/nnw.8 miles/ne.36 miles/wnw.6 miles/nw.8 miles/nw.36 miles/wnw.9 miles/wnw.4 miles/wnw.4 miles/w. miles/s.4 miles/e.5 miles/wnw.5 miles/wnw.6 miles/se.36 miles/wnw.9 miles/wnw.6 miles/nw.8 miles/nw.3 miles/wnw.5 miles/wnw. miles/wnw.4 miles/se - 3 of 7

' 777- Figure - Monitoring Well Locations, Byron Nuclear Generating Station, 9

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TBLE B-I. CONCENTRTIONS OF TRITIUM IN GROUNDWTER SMPLES COLLECTED IN THE VICINITY OF BYRON NUCLER GENERTION STTION, 9 RESULTS IN UNITS OF PCI/LITER ± SIGM SITE R- R- R- R- R- R- R- R- R-3 R-3 R-4 R-4 R-7 R-7 R-8 R-8 R-9 R-9 CR- CR- CR-3 CR-3 DF-4 DF-4 TW-3 TW-3 COLLECTION DTE 4/7/9 /3/9 4/7/9 /3/9 4/9/9 /5/9 4/9/9 /5/9 4/9/9 /4/9 4/9/9 /5/9 4/7/9 /3/9 4/7/9 /3/9 4/7/9 /3/9 4/9/9 /4/9 4/7/9 /3/9 4/9/9 /4/9 4/9/9 /4/9 < 57 < 65 < 55 < 94 < 5 < 5 H-3 ± 67 ± 57 < 55 < 49 < 57 < 7 < 5 < 63 < 53 < 8 < 5 < 49 < 53 < 9 < 54 <. 7 < 5 < 5 35 ± 89 36 ± 87 B- 7 of 7