WASTE STREAM 2F35 Excellox-Type Transport Flasks and French-Design Dry Flasks

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1 SITE SITE OWR WASTE CUSTODIAN WASTE TYPE Sellafield Nuclear Decommissioning Authority Sellafield Limited LLW WASTE VOLUMES Stocks: At Future arisings - Total future arisings: 45.4 m³ Comment on volumes: WASTE SOURCE PHYSICAL CHARACTERISTICS General description: Bulk density (t/m³): 2.92 Steel and lead containers internally contaminated with fission and activation products and with some actinides possibly present. weigh between 23.6 and 62.9 tonnes. The waste has not undergone any changes since it was generated and is stored dry and inside a building. Physical components : Irradiated fuel transport flasks (100%). Comment on density: CHEMICAL COMPOSITION 82.7 m³ Total waste volume: m³ Uncertainity factors on volumes: m³ m³ m³ Remaining flasks estimated to be taken out of service around <5% of the volume is assumed to arise as waste (maximum). Stock (upper): x 1.5 Arisings (upper) x 1.5 Stock (lower): x 0.5 Arisings (lower) x 0.5 become contaminated when used for the transport of irradiated fuel from reactors. Density ranges from 2.65 to 3.2 te/m³. The weighted average density is 2.92 te/m³. General description and components (%wt): Chemical state: Chemical form of radionuclides: Metals and alloys (%wt): Stainless steel (2.85%), other ferrous metals (38.9%), lead (53.63%), resin (2.85%), cement (0.32%) and copper (1.45%). The waste is neutral, and is neither oxidising nor reducing. H-3: Trace quantities likely to be present in some part of the waste, but chemical C-14: Trace quantities likely to be present in some part of the waste, but chemical Se-79: Unknown if present. Tc-99: Trace quantities likely to be present in some part of the waste, but chemical Ra: Not anticipated to be present. Th: Unknown if present. U: Not anticipated to be present. Np: Unknown if present. Pu: Trace quantities likely to be present in some part of the waste, but chemical This waste stream comprises various flasks with different specifications. Some flask specifications are as follows: Lid and base forging spec. BS A-4T-50. Plate spec. BS Lead BS 3909/2-4% antimony content lead alloy. Lead liner spec. BS TN type flasks are ASTM A350 forgings. material 304L stainless steel sheet. Excellox flasks - 100% bulk metal. French flasks - 96% bulk metal. Ferritic metal typically 305 & 100 mm thick. Stainless steel is 5 & 27 mm thick. Lead in rings are 152 mm thick.

2 Inorganic anions (%wt): Listed substances: Hazardous and problematic materials (%wt): Asbestos types and proportions: Complexing agents (%wt): Organics (%wt): Halogenated plastics and rubber (%wt): materials (%wt): Stainless steel Bronze... 0 ferrous metals Inconel... 0 Aluminium... 0 Nimonic... 0 Copper Stellite... 0 Lead Boral... 0 Zinc... 0 Dural... 0 Magnox/Magnesium... 0 Monel... 0 Zircaloy... 0 Uranium... Brass... 0 Beryllium... metals (below)... 0 metals: - No inorganic anions are present. Fluoride... 0 Chloride... 0 Iodide... 0 Cyanide... 0 Carbonate... 0 Cadmium is present in trace amounts in the bolts. Nitrate... 0 Nitrite... 0 Phosphate... 0 Sulphate... 0 Sulphide... 0 No materials likely to pose a fire or other non-radiological hazard have been identified. There may be minute quantities of asbestos in the form of valve gaskets. Combustible metals... 0 Strong oxidising agents... 0 Low flash point liquids... 0 Pyrophoric materials... 0 Explosive materials... 0 Generating toxic gases... 0 Phosphorus... 0 Reacting with water... 0 Hydrides... 0 Asbestos... TR Putrescible wastes... 0 Free aqueous liquids... 0 Biological etc. materials... 0 Free non-aqueous liquids... 0 Powder Not present. Complexing agents... Viton "O" ring seals between flask lid and flask body, and around valves, are made of Viton B rubber. The majority of the flasks are coated with CEGB System 6 epoxy based. Some flasks contain Bisco neutron shielding material NS-4_FR. Total cellulosics... 0 Paper, cotton... 0 Wood... 0 Halogenated plastics... 0 Total non-halogenated plastics... 0 Condensation polymers... 0 s... 0 Organic ion exchange materials... 0 Total rubber... TR Halogenated rubber... TR Non-halogenated rubber... 0 organics... TR Viton 'O' rings seals fluorocarbon elastomer << 0.01%. - Inorganic ion exchange materials.. 0 Inorganic sludges and flocs... 0 Soil... 0 Rubble... 0 Concrete, cement and sand Glass... 0 Ceramics... 0 Graphite... 0

3 LLW TREATMENT AND DISPOSAL Status of waste: Characterisation Form (WCF): consigned in year of generation: Treatments already carried out: Comment on treatments already carried out: Further treatments planned: Comment on further treatments: Category of waste after further planned treatments: Comment on category of waste: Stored pending future consignment to the LLWR. It is not yet determined if the waste meets the LLWR's Acceptance Criteria (WAC). No WSCD currently in place for this waste. It will be developed at the time for disposal of the flasks. No. The waste from the remaining flasks will arise when the flasks are prepared for disposal. Treatment Low force compaction Supercompaction (HFC) Incineration Encapsulation Metal decontamination Metal melting None No treatment to date, stored at Sellafield. Treatment treated treated Volume change factor Volume change factor Low force compaction Supercompaction (HFC) Incineration Encapsulation Metal decontamination Metal melting None 9.3 With the exception of 2 flasks identified as suitable for in-situ grouting at the LLWR, 5% (maximum) per flask will be generated by the dismantling process for disposal at the LLWR. Where necessary this will be decontaminated by current operational procedures to ensure LLW disposal criteria are met. Category High force compactable waste Uncompactable waste in disposal containers Large items for direct in-vault grouting Not yet determined will be kept to an absolute minimum and this will be determined during the development phases of work. High Force Compactable Density bands: (Not applicable to this waste stream) density (t/m³) < > 1.2 Not analysed by density 200-litre drums Loose

4 Uncompactable in Disposal Containers (Not applicable to this waste stream) Disposal container type: Inaccessible voidage: - Container Large Items For Direct In-Vault Grouting Bounding cuboidal volume (m³): Inaccessible voidage: - RADIOACTIVITY Third height ISO Half height ISO 4m box (no shielding) 2m box (no shielding) (Not applicable to this waste stream) loading (m³) Source: Accuracy: - Definition of total alpha and total beta/gamma: Fission and activation product contamination with some actinides possibly present arising from contact with spent fuel or cross contamination from items that have been in contact with spent fuel. Total activity has not been estimated. Measurement of specific activities: The radionuclides present have been estimated from available data and are indicative of the those that might be expected.

5 Nuclide at Average specific activity, TBq/m³ Bands and Future arisings Bands and H Be 10 C Cl 36 Ar 39 Ar 42 K 40 Ca 41 Mn 53 Mn Fe Co Ni Ni Zn 65 Se 79 Kr 81 Kr 85 Rb 87 Sr Zr 93 Nb 91 Nb 92 Nb 93m Nb 94 Mo 93 Tc 97 Tc Ru 106 Pd 107 Ag 108m Ag 110m Cd 109 Cd 113m Sn 119m Sn 121m Sn 123 Sn 126 Sb 125 Sb 126 Te 125m Te 127m I Cs Cs 135 Cs Ba 133 La 137 La 138 Ce 144 Pm 145 Pm 147 Sm 147 Sm 151 Eu 152 Eu 154 Eu 155 Gd 153 Bands (Upper and Lower) A a factor of 1.5 B a factor of 3 C a factor of 10 D a factor of 100 E a factor of 1000 Note: Bands quantify uncertainty in the average specific activity. Nuclide at Average specific activity, TBq/m³ Bands and Future arisings Bands and Ho 163 Ho 166m Tm 170 Tm 171 Lu 174 Lu 176 Hf 178n Hf 182 Pt 193 Tl 204 Pb 205 Pb 210 Bi 208 Bi 210m Po 210 Ra 223 Ra 225 Ra Ra 228 Ac 227 Th 227 Th 228 Th 229 Th 230 Th Th 234 Pa 231 Pa 233 U U U U U U Np 237 Pu 236 Pu Pu Pu Pu Pu Am Am 242m Am Cm 242 Cm 243 Cm 244 Cm 245 Cm 246 Cm 248 Cf 249 Cf 250 Cf 251 Cf 252 a 6 6 b/g 6 6 Total a Total b/g 1 Measured activity 2 Derived activity (best estimate) 3 Derived activity (upper limit) 4 Not present 5 Present but not significant 6 Likely to be present but not assessed 7 Present in significant quantities but not determined 8 Not expected to be present in significant quantity

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