Temelin NPP Risk Panel A PSA and Safety Monitor Application. Workshop Information IAEA Workshop

Transcription

1 IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making Temelin NPP Risk Panel A PSA and Safety Monitor Application Lecturer Lesson Lesson IV IV 3_11.7 3_11.7 Workshop Information IAEA Workshop City, XX XX - City -XX, Country Month, Year Year

2 TEMELIN PSA Project Temelin PSA Project carried out in with NUS Scope: Level 1 & 2, Shutdown, External events Support to plant staff in analyzing day-to-day decision issues related to the areas like: Operating and maintenance strategies based on risk minimization Outage risk management Assessment of modifications Tech Specs issues (AOTs, STIs, LCOs) IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 2

3 Further PSA and SM Activities All Temelin PSA models update for current plant status Conversion of updated PSA models to SM models (internal events, shutdown, Level 2) Software update for 3.0 version enabling: Dual Unit interactions Faster solution engine Maintenance Rule IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 3

4 Safety Monitor Features on-line risk monitoring (real, hypothetical) restoration advice from safety viewpoint important operable components calculating risk for scheduled configurations limiting recommended configuration time These are useful features, but Safety Monitor databases could provide also other interesting information IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 4

5 Risk Panel developed by Temelín n PSA Department Provides access to some of this information for any selected point in the operating history: equipment restoration advice combinations most contributing to risk system/trains inoperability indication probabilities of containment failure modes and STCs This application runs in MS Access 97 environment IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 5

6 Safety Monitor allows: to view operable components most important for plant safety in current configuration to view out-of-service components whose restoration reduces risk most significantly IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 6

7 However, these functions can be used only for last configuration calculated So, it is not possible to find out the most contributing components in any time point on risk profile (e.g. to find out reasons for high risk in the past) When optimizing schedules, risk peaks cannot be easily removed without knowing the highest contributors?? IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 7

8 Risk Panel allows: to calculate the most contributing components for any time point of a risk profile to calculate component out of service combinations contributing mostly to the risk to indicate direct or hidden train/system inoperability caused by the system dependencies IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 8

9 In this window, the user can enter a date and time of point to be analyzed (manually or by right- click to a desired point of the risk profile) and press Analysis IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 9

10 Configuration in the selected time point is loaded to database used for hypothetical calculations, calculated by Safety Monitor, and the most contributing components are listed by Safety Monitor... Restoration of one individual... however component may not lead to risk reduction down to the acceptable level... IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 10

11 Equipment Combinations As can be seen, for certain configurations, restoration of a single component made on Safety Monitor restoration advice does not reduce risk to the required level. This is solved by other Risk Panel function: Combinations - calculating the risk most contributing combinations of components IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 11

12 IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 12

13 The Analysis of Time Point dialog box provides another function: Accident Progression - calculating probability of containment failure mode, in case that core damage occurs, on basis of PSA Level 2 This function can be also used for any time point in operating risk profile provided that Level 2 model is available IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 13

14 IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 14

15 Another function of Risk Panel is System Panel that indicates availability of user defined plant systems depending on components out of service IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 15

16 and red color indicates that a system or a division is inoperable Green color Clicking on red, orange indicates that a Orange color or yellow item shows system is operable indicates that more reasons of inoperability than one division of a Yellow color system is inoperable indicates that one division of a system is inoperable IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 16

17 This screen shows portion of the Safety Monitor fault tree from top event at system/division level... Clicking at a gate develops corresponding branch of the fault tree.... to basic event(s) at component level. IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 17

18 ...and so on... IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 18

19 User User can can also customize perform the what-if System calculations... Panel by... adding items moving items removing items..and System Panel recalculates the fault tree to show new system inoperability IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 19

20 Other features of Risk Panel indicates date/time in status bar when moving mouse over the risk profile allows easy selection of risk profile interval shows normal/logarithmic scale of risk profile lists configuration in points of risk profile where CDF exceeds user specified limit prints graphs of CDF, releases, cumulative risk, probabilities of containment failure IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 20

21 Enter begin and end date manually... Print graph and reports Analyze of any... point and of display hypothetical configurations Set CDF limit where... profile/schedule CDF is above this limit... or drag mouse over risk profile IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 21

22 IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 22

23 IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 23

24 IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 24

25 IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 25

26 IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 26

27 SUMMARY Risk Panel does not replace Safety Monitor but provides additional useful functions: comprehensive, easy analysis of past configurations for any point in operating history system inoperability information Level 2 basic information printouts of graphs and reports for archiving, presentations or reports IAEA Training Course on Safety Assessment of NPPs to Assist Decision Making 27