Level 3 PSA - EDF Hinkley Point

HPC-NNBOSL-U0-000-RES-000028 Version 1.0
Level 3 PSA
NOT PROTECTIVELY MARKED
7 FIGURES ........................................................................................................................... 56
LIST OF TABLES
Table 1 – Overall Risk to Generic Worker from All Accidents ...................................................... 25
Table 2 – Risk Contribution by Dose Band ................................................................................... 25
Table 3 – Risk Contribution by Accident Group ............................................................................ 26
Table 4 – Accidents Considered for the Fuel Building Worker Cohort ......................................... 27
Table 5 – Risk Results for Worker Cohort Groups – Excluding LOSAs ....................................... 27
Table 6 – Risk Results for Worker Cohort Groups – Including LOSAs ........................................ 27
Table 7 – Effect Of Having Two EPR Units on Generic Worker Risk ........................................... 29
Table 8: Initiating Events Considered in the Design Basis Analysis of Chapter 14 ...................... 34
Table 9: Initiating Events Considered in the Level 1 PSA ............................................................ 36
Table 10: Sequences Added After Expert Review, including RRC-A, and Low Consequence
Events .......................................................................................................................................... 37
Table 11: Assessment of Additional Initiating Events not included in Level 1 PSA ...................... 39
Table 12:
{ CCI removed }
...................................................................................................................... 41
Table 13: End States Definition for PSA Level 1 Success Sequences ........................................ 43
Table 14: Non Core Damage End States from Level 1 PSA - Frequencies/Dose Bands ............ 44
Table 15: Core Damage Accidents (Release Categories) covered in Level 2 PSA ..................... 45
Table 16: Results from Assessment of Additional Sequences not Modelled in the Level 1 PSA 46
Table 17: Results for Assessment of Individual Risk Frequency .................................................. 47
Table 18: Results for Assessment of Societal Risk ...................................................................... 48
Table 19: Faults Identified in the PCC List (not included in PSA) ................................................ 49
Table 20: Faults Identified in the Expert Review List (not included in PSA) ................................. 50
Table 21: Faults Identified in the Additional Review ..................................................................... 51
Table 22: LOSAs .......................................................................................................................... 51
Table 23: Worker Risk Categories ................................................................................................ 53
Table 24: Overall Accident Frequency vs. Dose Results – SDO-5 Comparison .......................... 55
LIST OF FIGURES
Figure 1: Methodology for Assessment of Individual Risk ............................................................ 56
Figure 2: Comparison of the Individual Risk Assessment Results to SDO-7 ............................... 57
Figure 3: Methodology for Assessment of Societal Risk .............................................................. 58
Figure 4: Worker Risk Methodology Diagram ............................................................................... 59
Figure 5: Frequency-Dose ‘Staircase’ – SDO-5 Comparison ....................................................... 60
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