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{{#Wiki_filter:This excel file is to provide the CDF sequences and calculation summary for the SPAR model example that was used to estimate LERF from C-SGTR sequences as documented in Appendix 2-D of the RASP Handbook Volume 5.
{{#Wiki_filter:This excel file is to provide the CDF sequences and calculation summary for the SPAR model example that was used to estimate LERF from C-SGTR sequences as documented in Appendix 2-D of the RASP Handbook Volume 5.


Table D-2 Summary Table                         07/27/2017 Total CDF In 38 CDF     in Residue   subject to                CDF        LERF Category                                                                    p(csgtr) seqs.    (seqs. 39-711)     csgtr                 (csgtr)   (csgtr) challenge Plant CDF =                     2.95E-05       1.15E-06     3.07E-05 96.26%
Table D-2 Summary Table 07/27/2017 Category In 38 CDF seqs.
1     HDL no RCS loop clearing       4.90E-06       1.90E-07     5.09E-06       0.024   1.2E-07     1.2E-07 2     HDL with RCS loop clearing     2.09E-07       8.13E-09     1.00E-08         1     1.0E-08     1.0E-08 Non HDL CDF with 3                                                                                    0.05   3.3E-08     3.3E-08 subsumed FSG ATWS with failure of 4                                      3.79E-07       1.47E-08     3.94E-07         0.05   2.0E-08     2.0E-08 pressure relief 5     Large SSB                                                                     0.02   3.0E-09     3.0E-09 Totals =         5.49E-06               1.9E-07     1.9E-07
in Residue (seqs. 39-711)
                                                      % of plant CDF     18%                   0.6%
Total CDF subject to csgtr challenge p(csgtr)
CDF (csgtr)
LERF (csgtr)
Plant CDF =
2.95E-05 1.15E-06 3.07E-05 96.26%
1 HDL no RCS loop clearing 4.90E-06 1.90E-07 5.09E-06 0.024 1.2E-07 1.2E-07 2
HDL with RCS loop clearing 2.09E-07 8.13E-09 1.00E-08 1
1.0E-08 1.0E-08 3
Non HDL CDF with subsumed FSG 0.05 3.3E-08 3.3E-08 4
ATWS with failure of pressure relief 3.79E-07 1.47E-08 3.94E-07 0.05 2.0E-08 2.0E-08 5
Large SSB 0.02 3.0E-09 3.0E-09 Totals =
5.49E-06 1.9E-07 1.9E-07
% of plant CDF 18%
0.6%
Note: No CAT-2 sequences were in the top 38 sequences. An examination of lower CDF sequences indicated that CAT-2 frequency is expected to be at the order of 1E-08, which is used in this table.
Note: No CAT-2 sequences were in the top 38 sequences. An examination of lower CDF sequences indicated that CAT-2 frequency is expected to be at the order of 1E-08, which is used in this table.
A more rigourous calculation can be done by examining the cutsets with B1 and B2 seal failures coincident with AFW failures.
A more rigourous calculation can be done by examining the cutsets with B1 and B2 seal failures coincident with AFW failures.
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Sequence List (4)
Sequence List (4)
C-SGTR RASP Handbook worksheet CDF sequences to estimate LERF Public v2.xlsx 3
12/03/2018


== Conclusion:==
==
Conclusion:==
For this selected example plant CDF model, based on the top 33 CDF sequences, about 18% of the CDF would be subject to C-SGTR, as shown below.
For this selected example plant CDF model, based on the top 33 CDF sequences, about 18% of the CDF would be subject to C-SGTR, as shown below.
These top 33 sequences make up 96% of total plant CDF from internal events.                                                                               CDF Seqs 1-38           2.95E-05 04/24/2015 0:00                                                     HDL Cat-1 only in 1-38   4.90E-06 VOGTLE SPAR MODEL           Dominant Sequence Results                                                                                                     HDL Cat-2 only in 1-38   2.09E-07 1-38     39-711   1-711                         Cat-4 only in 1-38       3.79E-07 Totals= 3.07E-05                                                 Plant CDF =       2.95E-05 1.15E-06 3.07E-05 Plant CDF % =       96.26%   3.74% 100.00%
These top 33 sequences make up 96% of total plant CDF from internal events.
RCS RCP Pressure                          RPS, Event Tree     Sequence         CDF     Description                                                     AFW     LOOP     EDG                   SLOCA,  Category
CDF Seqs 1-38 2.95E-05 04/24/2015 0:00 HDL Cat-1 only in 1-38 4.90E-06 VOGTLE SPAR MODEL Dominant Sequence Results HDL Cat-2 only in 1-38 2.09E-07 1-38 39-711 1-711 Cat-4 only in 1-38 3.79E-07 Totals=
(/RSD or                       RCSPRESS OR LOCA LPI)
3.07E-05 Plant CDF = 2.95E-05 1.15E-06 3.07E-05 Plant CDF % =
IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW, 1  LONSW          04-02-10        1.67E-05                                                                                                  low    182 gpm    OK-1
96.26%
                                            /RCPT, /RSD, /BP1, BP2, HPI, SSC1 2 LOACA         20             2.50E-06 /RPS, AFW, MFW, FAB                                               Fails                           high               cat-1
3.74%
                                            /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI, 3  LOACA         02-02-03        2.23E-06                                                                                                   low    182 gpm    OK-1
100.00%
                                            /SSC, RHR, LPR
Event Tree Sequence CDF Description AFW LOOP EDG RCS Pressure
                                            /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI, 4  LOACA          02-02-09        1.91E-06                                                                                                  low     182 gpm   OK-1
(/RSD or LPI)
                                            /SSC1, LPI IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW, 5  LONSW          04-03-10        8.36E-07                                                                                                  high    76 gpm    OK-1
RCP
                                            /RCPT, /RSD, BP1, /BP2, HPI, SSC1 6 LOACA         19             5.74E-07 /RPS, AFW, MFW, /FAB, SSCR, HPR                                   Fails                           high               cat-1 7 ISL-RHR       3               3.89E-07 ISL-RPT-RHR, /ISL-DIAG, ISL-REC-RHR                                                             ISL low             OK-3 ATWS Pres.
: SLOCA, OR LOCA Category
8  TRANS         21-16           3.79E-07   RPS, RCSPRESS                                                                               ATWS high             cat-4 Spike 9 MLOCA           03             3.49E-07   /RPS, /HPI-ML, /AFW-ATWS, /SSC, HPR, LPR                                                       low     MLOCA     OK-2 10 TRANS         20             3.15E-07   /RPS, AFW, MFW, FAB                                             Fails                           high               cat-1
: RPS, RCSPRESS 1
                                            /RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, /BP2, OPR-04H, 11 LOOPWR        16-03-10        2.61E-07                                                                  Fails     Loop     Fails       high   21 gpm     cat-1 DGR-04H, AFW-MAN, SG-DEP-LT
LONSW 04-02-10 1.67E-05 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,  
                                            /RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, OPR-04H, 12 LOOPWR        16-06          2.18E-07                                                                Late fails Loop     Fails       high   182 gpm   cat-1 DGR-04H IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW, 13 LONSW          04-04-10        2.09E-07  /RCPT, /RSD, BP1, BP2, HPI-ML, /ACC, /AFW-ATWS, /SSC,                                           lsc   480 gpm   cat-2 LPI 14 LOOPGR         15             2.08E-07   /RPS-L, /EPS, AFW-L, FAB-L                                     Fails     Loop                 high               cat-1
/RCPT, /RSD, /BP1, BP2, HPI, SSC1 low 182 gpm OK-1 2
                                            /RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, /BP2, OPR-04H, 15 LOOPGR        16-03-10        1.73E-07                                                                  Fails    Loop    Fails        high    21 gpm    cat-1 DGR-04H, AFW-MAN, SG-DEP-LT 16 LOOPWR         16-45           1.64E-07   /RPS-L, EPS, AFW-B, OPR-04H, DGR-04H                           Fails     Loop     Fails       high               cat-1 17 ISL-RHR       4               1.50E-07   ISL-RPT-RHR, ISL-DIAG                                                                         ISL low             OK-3
LOACA 20 2.50E-06
                                            /RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, OPR-04H, 18 LOOPGR        16-06          1.44E-07                                                                Late fails Loop     Fails       high   182 gpm   cat-1 DGR-04H
/RPS, AFW, MFW, FAB Fails high cat-1 3
                                            /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI, 19 LODCA          02-02-03        1.21E-07                                                                                                   low    182 gpm    OK-1
LOACA 02-02-03 2.23E-06
                                            /SSC, RHR, LPR
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI,  
                                            /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI, 20 TRANS          02-02-09        1.19E-07                                                                                                  low     182 gpm   OK-1
/SSC, RHR, LPR low 182 gpm OK-1 4
                                            /SSC1, LPI 21 LOOPSC         15             1.13E-07   /RPS-L, /EPS, AFW-L, FAB-L                                     Fails     Loop                                     cat-1
LOACA 02-02-09 1.91E-06
                                            /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, BP1, /BP2, /HPI, 22 LOACA          02-03-03        1.12E-07                                                                                                   low    76 gpm    OK-1
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI,  
                                            /SSC, RHR, LPR
/SSC1, LPI low 182 gpm OK-1 5
                                            /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI, 23 LODCA          02-02-09        1.09E-07                                                                                                  low     182 gpm   OK-1
LONSW 04-03-10 8.36E-07 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,  
                                            /SSC1, LPI 24 LOOPGR         16-45           1.08E-07   /RPS-L, EPS, AFW-B, OPR-04H, DGR-04H                           Fails     Loop     Fails                           cat-1
/RCPT, /RSD, BP1, /BP2, HPI, SSC1 high 76 gpm OK-1 6
                                            /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI, 25 LODCB          02-02-09        1.06E-07                                                                                                  low     182 gpm   OK-1
LOACA 19 5.74E-07
                                            /SSC1, LPI 26 RXVRUPT       2               1.00E-07   RXVESSEL                                                                                                           OK-4 27 MLOCA         10             9.74E-08   /RPS, HPI-ML, /ACC, /AFW-ATWS, /SSC, LPI                                                       low     MLOCA     OK-2 C-SGTR RASP Handbook worksheet CDF sequences to estimate LERF Public v2.xlsx                  3                                                                                  12/03/2018
/RPS, AFW, MFW, /FAB, SSCR, HPR Fails high cat-1 7
ISL-RHR 3
3.89E-07 ISL-RPT-RHR, /ISL-DIAG, ISL-REC-RHR ISL low OK-3 8
TRANS 21-16 3.79E-07 RPS, RCSPRESS ATWS high cat-4 ATWS Pres.
Spike 9
MLOCA 03 3.49E-07
/RPS, /HPI-ML, /AFW-ATWS, /SSC, HPR, LPR low MLOCA OK-2 10 TRANS 20 3.15E-07
/RPS, AFW, MFW, FAB Fails high cat-1 11 LOOPWR 16-03-10 2.61E-07
/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, /BP2, OPR-04H, DGR-04H, AFW-MAN, SG-DEP-LT Fails Loop Fails high 21 gpm cat-1 12 LOOPWR 16-06 2.18E-07
/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, OPR-04H, DGR-04H Late fails Loop Fails high 182 gpm cat-1 13 LONSW 04-04-10 2.09E-07 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,  
/RCPT, /RSD, BP1, BP2, HPI-ML, /ACC, /AFW-ATWS, /SSC, LPI lsc 480 gpm cat-2 14 LOOPGR 15 2.08E-07
/RPS-L, /EPS, AFW-L, FAB-L Fails Loop high cat-1 15 LOOPGR 16-03-10 1.73E-07
/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, /BP2, OPR-04H, DGR-04H, AFW-MAN, SG-DEP-LT Fails Loop Fails high 21 gpm cat-1 16 LOOPWR 16-45 1.64E-07
/RPS-L, EPS, AFW-B, OPR-04H, DGR-04H Fails Loop Fails high cat-1 17 ISL-RHR 4
1.50E-07 ISL-RPT-RHR, ISL-DIAG ISL low OK-3 18 LOOPGR 16-06 1.44E-07
/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, OPR-04H, DGR-04H Late fails Loop Fails high 182 gpm cat-1 19 LODCA 02-02-03 1.21E-07
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI,  
/SSC, RHR, LPR low 182 gpm OK-1 20 TRANS 02-02-09 1.19E-07
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI,  
/SSC1, LPI low 182 gpm OK-1 21 LOOPSC 15 1.13E-07
/RPS-L, /EPS, AFW-L, FAB-L Fails Loop cat-1 22 LOACA 02-03-03 1.12E-07
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, BP1, /BP2, /HPI,  
/SSC, RHR, LPR low 76 gpm OK-1 23 LODCA 02-02-09 1.09E-07
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI,  
/SSC1, LPI low 182 gpm OK-1 24 LOOPGR 16-45 1.08E-07
/RPS-L, EPS, AFW-B, OPR-04H, DGR-04H Fails Loop Fails cat-1 25 LODCB 02-02-09 1.06E-07
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI,  
/SSC1, LPI low 182 gpm OK-1 26 RXVRUPT 2
1.00E-07 RXVESSEL OK-4 27 MLOCA 10 9.74E-08
/RPS, HPI-ML, /ACC, /AFW-ATWS, /SSC, LPI low MLOCA OK-2


Sequence List (4)
Sequence List (4)
                                        /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, BP1, /BP2, HPI, 28 LOACA        02-03-09    9.54E-08                                                                                  low   76 gpm OK-1
C-SGTR RASP Handbook worksheet CDF sequences to estimate LERF Public v2.xlsx 4
                                        /SSC1, LPI IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW, 29 LONSW        04-14-10    8.46E-08                                                                                  low          OK-1 RCPT, HPI-ML, /ACC, /AFW-ATWS, /SSC, LPI
12/03/2018 28 LOACA 02-03-09 9.54E-08
                                        /RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2, 30 LOOPGR      02-02-09    8.46E-08                                                                      Loop        low  76 gpm  OK-1
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, BP1, /BP2, HPI,  
                                        /OPR-02H, /RPS, /AFW, HPI, /SSC1, LPI 31 SLOCA       03           8.38E-08   /RPS, /AFW, /HPI, /SSC, RHR, LPR                                               low   SLOCA   OK-1 32 SGTR         12           8.23E-08   /RPS, /AFW, /HPI, SGI, REFILL1, ECA                                                           SGTR
/SSC1, LPI low 76 gpm OK-1 29 LONSW 04-14-10 8.46E-08 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW, RCPT, HPI-ML, /ACC, /AFW-ATWS, /SSC, LPI low OK-1 30 LOOPGR 02-02-09 8.46E-08
                                        /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI, 33 TRANS        02-02-03    7.91E-08                                                                                   low  76 gpm  OK-1
/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2,  
                                        /SSC, RHR, LPR
/OPR-02H, /RPS, /AFW, HPI, /SSC1, LPI Loop low 76 gpm OK-1 31 SLOCA 03 8.38E-08
                                        /RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2, 34 LOOPSC      02-02-09    7.21E-08                                                                      Loop              182 gpm OK-1
/RPS, /AFW, /HPI, /SSC, RHR, LPR low SLOCA OK-1 32 SGTR 12 8.23E-08
                                        /OPR-02H, /RPS, /AFW, HPI, /SSC1, LPI 35 LOOPWR       15           6.64E-08   /RPS-L, /EPS, AFW-L, FAB-L                                   Fails Loop                       cat-1 36 TRANS       21-14       6.24E-08   RPS, /RCSPRESS, MFW, /AFW-ATWS, BORATION                                                     ATWS
/RPS, /AFW, /HPI, SGI, REFILL1, ECA SGTR 33 TRANS 02-02-03 7.91E-08
                                        /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI, 37 LODCB        02-02-03    5.57E-08                                                                                  low          OK-1
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI,  
                                        /SSC, RHR, LPR 38 LOMFW       20           5.44E-08   /RPS, AFW, MFW, FAB                                         Fails                             cat-1
/SSC, RHR, LPR low 76 gpm OK-1 34 LOOPSC 02-02-09 7.21E-08
                                        /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, BP1, BP2, HPI-ML, 39 LOACA        02-04-12    5.18E-08                                                                Fails                    480 gpm
/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2,  
                                        /ACC, AFW-ATWS
/OPR-02H, /RPS, /AFW, HPI, /SSC1, LPI Loop 182 gpm OK-1 35 LOOPWR 15 6.64E-08
                                        /RPS-L, EPS, /AFW-B, /PORV, /RSD-B, BP1, BP2, /OPR-02H, 40 LOOPGR      16-10-2      4.81E-08                                                                      Loop Fails        480 gpm
/RPS-L, /EPS, AFW-L, FAB-L Fails Loop cat-1 36 TRANS 21-14 6.24E-08 RPS, /RCSPRESS, MFW, /AFW-ATWS, BORATION ATWS 37 LODCB 02-02-03 5.57E-08
                                        /HPI, /SSC, LPR 41 LOCHS       12           4.62E-08   /RPS, AFW, FAB                                               Fails                             cat-1
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI,  
                                        /RPS-L, EPS, /AFW-B, /PORV, /RSD-B, BP1, BP2, /OPR-02H, 42 LOOPSC      16-10-2     4.10E-08                                                                     Loop Fails        480 gpm
/SSC, RHR, LPR low OK-1 38 LOMFW 20 5.44E-08
                                        /HPI, /SSC, LPR
/RPS, AFW, MFW, FAB Fails cat-1 39 LOACA 02-04-12 5.18E-08
                                        /RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, /OPR-04H, 43 LOOPGR       16-04-2      4.07E-08                                                                     Loop Fails
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, BP1, BP2, HPI-ML,  
                                        /HPI, /SSC, LPR
/ACC, AFW-ATWS Fails 480 gpm 40 LOOPGR 16-10-2 4.81E-08
                                        /RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, /OPR-04H, 44 LOOPGR      16-04-7      4.00E-08                                                                      Loop Fails HPI, /SSC, LPI
/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, BP1, BP2, /OPR-02H,  
                                        /RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI, 45 LOACA        02-02-10    3.82E-08 SSC1 46 LOMFW       21-16       3.79E-08   RPS, RCSPRESS                                                                                 cat-4 Pres. Spike 47 LOCHS       13-16       3.22E-08   RPS, RCSPRESS                                                                                 cat-4 Pres. Spike 48 LOACA       21-15       2.86E-08   RPS, /RCSPRESS, MFW, AFW-ATWS                               Fails 49 SGTR       19           2.84E-08   /RPS, AFW, /HPI, /SGI, FAB                                   Fails                           SGTR
/HPI, /SSC, LPR Loop Fails 480 gpm 41 LOCHS 12 4.62E-08
                                        /RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2, 50 LOOPWR      02-02-09    2.71E-08                                                                      Loop
/RPS, AFW, FAB Fails cat-1 42 LOOPSC 16-10-2 4.10E-08
                                        /OPR-02H, /RPS, /AFW, HPI, /SSC1, LPI
/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, BP1, BP2, /OPR-02H,  
                                        /RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2, 51 LOOPGR      02-05        2.60E-08                                                                      Loop OPR-02H, HPI-L 52 ISL-LPI     3           2.27E-08   ISL-RPT-LPI, /ISL-DIAG, ISL-REC-LPI                                           ISL low 53 LOACA       02-14-12     2.12E-08   /RPS, /AFW, /PORV, LOSC, RCPT, HPI-ML, /ACC, AFW-ATWS       Fails 54 LOOPPC       15           2.08E-08   /RPS-L, /EPS, AFW-L, FAB-L                                   Fails Loop                       cat-1
/HPI, /SSC, LPR Loop Fails 480 gpm 43 LOOPGR 16-04-2 4.07E-08
                                        /RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, /BP2, OPR-04H, 55 LOOPSC      16-03-10    1.99E-08                                                                Fails Loop Fails DGR-04H, AFW-MAN, SG-DEP-LT 56 LODCB       20           1.86E-08   /RPS, AFW, MFW, FAB                                         Fails 57 LLOCA       2           1.79E-08   /ACC, /LPI, LPR-LL                                                                   LLOCA   OK-2 58 SGTR         09           1.72E-08   /RPS, /AFW, /HPI, /SGI, SSC, REFILL1, ECA IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW, 59 LONSW        04-06-10    1.67E-08
/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, /OPR-04H,  
                                        /RCPT, RSD, /BP1, /O1, /BP2, O2, HPI, SSC1 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW, 60 LONSW        04-08-10    1.67E-08
/HPI, /SSC, LPR Loop Fails 44 LOOPGR 16-04-7 4.00E-08
                                        /RCPT, RSD, /BP1, O1, /BP2, /O2, HPI, SSC1 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW, 61 LONSW        04-09-10    1.67E-08
/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, /OPR-04H, HPI, /SSC, LPI Loop Fails 45 LOACA 02-02-10 3.82E-08
                                        /RCPT, RSD, /BP1, O1, /BP2, O2, HPI, SSC1 C-SGTR RASP Handbook worksheet CDF sequences to estimate LERF Public v2.xlsx          4                                                            12/03/2018
/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI, SSC1 46 LOMFW 21-16 3.79E-08 RPS, RCSPRESS cat-4 Pres. Spike 47 LOCHS 13-16 3.22E-08 RPS, RCSPRESS cat-4 Pres. Spike 48 LOACA 21-15 2.86E-08 RPS, /RCSPRESS, MFW, AFW-ATWS Fails 49 SGTR 19 2.84E-08
/RPS, AFW, /HPI, /SGI, FAB Fails SGTR 50 LOOPWR 02-02-09 2.71E-08
/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2,  
/OPR-02H, /RPS, /AFW, HPI, /SSC1, LPI Loop 51 LOOPGR 02-05 2.60E-08
/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2, OPR-02H, HPI-L Loop 52 ISL-LPI 3
2.27E-08 ISL-RPT-LPI, /ISL-DIAG, ISL-REC-LPI ISL low 53 LOACA 02-14-12 2.12E-08
/RPS, /AFW, /PORV, LOSC, RCPT, HPI-ML, /ACC, AFW-ATWS Fails 54 LOOPPC 15 2.08E-08
/RPS-L, /EPS, AFW-L, FAB-L Fails Loop cat-1 55 LOOPSC 16-03-10 1.99E-08
/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, /BP2, OPR-04H, DGR-04H, AFW-MAN, SG-DEP-LT Fails Loop Fails 56 LODCB 20 1.86E-08
/RPS, AFW, MFW, FAB Fails 57 LLOCA 2
1.79E-08
/ACC, /LPI, LPR-LL LLOCA OK-2 58 SGTR 09 1.72E-08
/RPS, /AFW, /HPI, /SGI, SSC, REFILL1, ECA 59 LONSW 04-06-10 1.67E-08 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,  
/RCPT, RSD, /BP1, /O1, /BP2, O2, HPI, SSC1 60 LONSW 04-08-10 1.67E-08 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,  
/RCPT, RSD, /BP1, O1, /BP2, /O2, HPI, SSC1 61 LONSW 04-09-10 1.67E-08 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,  
/RCPT, RSD, /BP1, O1, /BP2, O2, HPI, SSC1


Sequence List (4)
Sequence List (4)
OK-1   No C-SGTR challenge because AFW OK; RSD OK (RHR pump operation pressure range is reached in RCS).
C-SGTR RASP Handbook worksheet CDF sequences to estimate LERF Public v2.xlsx 5
OK-2   No C-SGTR challenge because of MLOCA or LLOCA; RCS pressure is not high.
12/03/2018 OK-1 No C-SGTR challenge because AFW OK; RSD OK (RHR pump operation pressure range is reached in RCS).
OK-3   No C-SGTR since: AFW is most likely OK (not querried in the ET); RCS likely depressurized either by break size or by operator action.
OK-2 No C-SGTR challenge because of MLOCA or LLOCA; RCS pressure is not high.
OK-4   No C-SGTR since low RCS pressure due to vessel failure RSD = Rapid secondary depressurization.
OK-3 No C-SGTR since: AFW is most likely OK (not querried in the ET); RCS likely depressurized either by break size or by operator action.
OK-4 No C-SGTR since low RCS pressure due to vessel failure RSD = Rapid secondary depressurization.
SSC = Cooldown (primary and secondary)
SSC = Cooldown (primary and secondary)
LOSC = RCP seal cooling maintained C-SGTR RASP Handbook worksheet CDF sequences to estimate LERF Public v2.xlsx                    5                                          12/03/2018
LOSC = RCP seal cooling maintained


Fault Tree     Description 1 ACC           ACCUMULATOR 3-OF-3 2 AFW           AUXILIARY FEEDWATER 3 AFW-ATWS       AUXILIARY FEEDWATER 4 AFW-B         AUXILIARY FEEDWATER (BLACKOUT) 5 AFW-L         VOGTLE AFW USING LOOP-FTF FAULT TREE FLAGS FAULT TREE 6 AFW-MAN       MANUAL CONTROL AFW 7 BORATION       EMERGENCY BORATION 8 BP1           RCP SEAL STAGE 1 INTEGRITY (BINDING/POPPING) 9 BP2           RCP SEAL STAGE 2 INTEGRITY (BINDING/POPPING) 10 CSI           TERMINATE OR CONTROL SAFETY INJECTION 11 CST-REFILL     CONDENSATE STORAGE TANK REFILL 12 CST-REFILL-LT CONDENSATE STORAGE TANK REFILL LONG-TERM 13 CST-REFILL-LT1 CONDENSATE STORAGE TANK REFILL LONG-TERM 14 DGR-01H       OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 1 HOUR 15 DGR-02H       OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 2 HOURS 16 DGR-03H       OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 3 HOURS 17 DGR-04H       DIESEL GENERATOR RECOVERY (IN 4 HR) 18 DGR-06H       OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 6 HOURS 19 DGR-08H       OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 8 HOURS 20 DGR-30M       OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 30 MINUTES 21 ECA           DECAY HEAT REMOVAL /RECOVERY (ECA-3.1/3.2) 22 EPS           EMERGENCY POWER 23 FAB           FEED AND BLEED 24 FAB-L         VOGTLE FEED AND BLEED IS UNAVAILABLE using LOOP-FTF 25 FAB-NSW       FEED AND BLEED IS UNAVAILABLE USING LONSW-FTF 26 FAB2           FEED AND BLEED (1 PORV REQUIRED) 27 HPI           HIGH PRESSURE INJECTION 28 HPI-L         HIGH PRESSURE INJECTION 29 HPI-ML         HIGH PRESSURE INJECTION 30 HPR           HIGH PRESSURE RECIRC 31 HPR-L         HIGH PRESSURE RECIRC 32 HPR-ML         HIGH PRESSURE RECIRCULATION 33 HPR1           HIGH PRESSURE RECIRCULATION 34 IE-ISL-HPI     ISLOCA IE 2-CKV HPI interface 35 IE-ISL-LPI     ISLOCA IE 2-CKV LPI interface 36 IE-ISL-RHR     RHR pipe ruptures
Fault Tree Description 1
ACC ACCUMULATOR 3-OF-3 2
AFW AUXILIARY FEEDWATER 3
AFW-ATWS AUXILIARY FEEDWATER 4
AFW-B AUXILIARY FEEDWATER (BLACKOUT) 5 AFW-L VOGTLE AFW USING LOOP-FTF FAULT TREE FLAGS FAULT TREE 6
AFW-MAN MANUAL CONTROL AFW 7
BORATION EMERGENCY BORATION 8
BP1 RCP SEAL STAGE 1 INTEGRITY (BINDING/POPPING) 9 BP2 RCP SEAL STAGE 2 INTEGRITY (BINDING/POPPING) 10 CSI TERMINATE OR CONTROL SAFETY INJECTION 11 CST-REFILL CONDENSATE STORAGE TANK REFILL 12 CST-REFILL-LT CONDENSATE STORAGE TANK REFILL LONG-TERM 13 CST-REFILL-LT1 CONDENSATE STORAGE TANK REFILL LONG-TERM 14 DGR-01H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 1 HOUR 15 DGR-02H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 2 HOURS 16 DGR-03H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 3 HOURS 17 DGR-04H DIESEL GENERATOR RECOVERY (IN 4 HR) 18 DGR-06H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 6 HOURS 19 DGR-08H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 8 HOURS 20 DGR-30M OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 30 MINUTES 21 ECA DECAY HEAT REMOVAL /RECOVERY (ECA-3.1/3.2) 22 EPS EMERGENCY POWER 23 FAB FEED AND BLEED 24 FAB-L VOGTLE FEED AND BLEED IS UNAVAILABLE using LOOP-FTF 25 FAB-NSW FEED AND BLEED IS UNAVAILABLE USING LONSW-FTF 26 FAB2 FEED AND BLEED (1 PORV REQUIRED) 27 HPI HIGH PRESSURE INJECTION 28 HPI-L HIGH PRESSURE INJECTION 29 HPI-ML HIGH PRESSURE INJECTION 30 HPR HIGH PRESSURE RECIRC 31 HPR-L HIGH PRESSURE RECIRC 32 HPR-ML HIGH PRESSURE RECIRCULATION 33 HPR1 HIGH PRESSURE RECIRCULATION 34 IE-ISL-HPI ISLOCA IE 2-CKV HPI interface 35 IE-ISL-LPI ISLOCA IE 2-CKV LPI interface 36 IE-ISL-RHR RHR pipe ruptures


37 IE-LOACCW   LOSS OF AUXILIARY COMPONENT COOLING WATER 38 IE-LONSW   LOSS OF NUCLEAR SERVICE COOLING WATER 39 IE-LOOP     LOSS OF OFFSITE POWER 40 IE-SGTR     SG TUBE RUPTURE 41 IE-SLBIC   STEAMLINE BREAK INSIDE CONTAINMENT INITIATOR 42 IEFT-LOACW AUXILIARY COMPONENT COOLING WATER (IE FT) 43 IEFT-LONSCW NUCLEAR SERVICE COOLING WATER (IE FAULT TREE) 44 ISL-DIAG   Operators fail to diagnose ISLOCA 45 ISL-REC-HPI Operators fail to recover (isolate) ISLOCA 46 ISL-REC-LPI Operators fail to recover (isolate) ISLOCA 47 ISL-REC-RHR Operators fail to recover (isolate) ISLOCA 48 ISL-RPT-HPI HPI pipe ruptures 49 ISL-RPT-LPI LPI pipe ruptures 50 ISL-RPT-RHR RHR/SDC pipe ruptures 51 LOSC       RCP SEAL COOLING MAINTAINED 52 LOSC-ACCW   LOSS OF SEAL COOLING 53 LOSC-L     VOGTLE RCPSL USING LOOP-FTF FAULT TREE FLAGS 54 LOSC-NSW   LOSS OF SEAL COOLING 55 LOSC-TT     LOSS OF SEAL COOLING (TURBINE TRIP) 56 LPI         LOW PRESSURE INJECTION 57 LPI-NSW     LOW PRESSURE INJECTION - LONSW 58 LPR         LOW PRESSURE RECIRC 59 LPR-LL     LOW PRESSURE RECIRCULATION 60 LPR-NSW     LOW PRESSURE RECIRCULATION - LONSW 61 MFW         MAIN FEEDWATER 62 O1         RCP SEAL STAGE 1 INTEGRITY (O-RING EXTRUSION) 63 O2         RCP SEAL STAGE 2 INTEGRITY (O-RING EXTRUSION) 64 OPR         OFFSITE POWER RECOVERY 65 OPR-01H     OPERATOR FAILS TO RECOVER OFFSITE POWER IN 1 HOUR 66 OPR-02H     OFFSITE POWER RECOVERY IN 2 HRS 67 OPR-03H     OPERATOR FAILS TO RECOVER OFFSITE POWER IN 3 HOURS 68 OPR-04H     OFFSITE POWER RECOVERY (IN 4 HR) 69 OPR-06H     OFFSITE POWER RECOVERY IN 6 HRS 70 OPR-08H     OPERATOR FAILS TO RECOVER OFFSITE POWER IN 8 HOURS 71 OPR-30M     OPERATOR FAILS TO RECOVER OFFSITE POWER IN 30 MINUTES 72 PORV       PORVs ARE CLOSED 73 PORV-B     VOGTLE PORVs/SRVs OPEN DURING STATION BLACKOUT 74 PORV-L     VOGTLE PORVs/SRVs OPEN DURING LOOP 75 PORV1       VOGTLE PORVS/SRVS OPEN DURING TRANSIENTS (AFW FAILED) 76 PORV2       PORVs ARE CLOSED
37 IE-LOACCW LOSS OF AUXILIARY COMPONENT COOLING WATER 38 IE-LONSW LOSS OF NUCLEAR SERVICE COOLING WATER 39 IE-LOOP LOSS OF OFFSITE POWER 40 IE-SGTR SG TUBE RUPTURE 41 IE-SLBIC STEAMLINE BREAK INSIDE CONTAINMENT INITIATOR 42 IEFT-LOACW AUXILIARY COMPONENT COOLING WATER (IE FT) 43 IEFT-LONSCW NUCLEAR SERVICE COOLING WATER (IE FAULT TREE) 44 ISL-DIAG Operators fail to diagnose ISLOCA 45 ISL-REC-HPI Operators fail to recover (isolate) ISLOCA 46 ISL-REC-LPI Operators fail to recover (isolate) ISLOCA 47 ISL-REC-RHR Operators fail to recover (isolate) ISLOCA 48 ISL-RPT-HPI HPI pipe ruptures 49 ISL-RPT-LPI LPI pipe ruptures 50 ISL-RPT-RHR RHR/SDC pipe ruptures 51 LOSC RCP SEAL COOLING MAINTAINED 52 LOSC-ACCW LOSS OF SEAL COOLING 53 LOSC-L VOGTLE RCPSL USING LOOP-FTF FAULT TREE FLAGS 54 LOSC-NSW LOSS OF SEAL COOLING 55 LOSC-TT LOSS OF SEAL COOLING (TURBINE TRIP) 56 LPI LOW PRESSURE INJECTION 57 LPI-NSW LOW PRESSURE INJECTION - LONSW 58 LPR LOW PRESSURE RECIRC 59 LPR-LL LOW PRESSURE RECIRCULATION 60 LPR-NSW LOW PRESSURE RECIRCULATION - LONSW 61 MFW MAIN FEEDWATER 62 O1 RCP SEAL STAGE 1 INTEGRITY (O-RING EXTRUSION) 63 O2 RCP SEAL STAGE 2 INTEGRITY (O-RING EXTRUSION) 64 OPR OFFSITE POWER RECOVERY 65 OPR-01H OPERATOR FAILS TO RECOVER OFFSITE POWER IN 1 HOUR 66 OPR-02H OFFSITE POWER RECOVERY IN 2 HRS 67 OPR-03H OPERATOR FAILS TO RECOVER OFFSITE POWER IN 3 HOURS 68 OPR-04H OFFSITE POWER RECOVERY (IN 4 HR) 69 OPR-06H OFFSITE POWER RECOVERY IN 6 HRS 70 OPR-08H OPERATOR FAILS TO RECOVER OFFSITE POWER IN 8 HOURS 71 OPR-30M OPERATOR FAILS TO RECOVER OFFSITE POWER IN 30 MINUTES 72 PORV PORVs ARE CLOSED 73 PORV-B VOGTLE PORVs/SRVs OPEN DURING STATION BLACKOUT 74 PORV-L VOGTLE PORVs/SRVs OPEN DURING LOOP 75 PORV1 VOGTLE PORVS/SRVS OPEN DURING TRANSIENTS (AFW FAILED) 76 PORV2 PORVs ARE CLOSED


77 PWR-REC     LATE POWER RECOVERY 78 PWR-REC-06H LATE POWER RECOVERY (6 HR) 79 PWR-REC-07H LATE POWER RECOVERY (7 HR) 80 PWR-REC-09H LATE POWER RECOVERY (9 HR) 81 PWR-REC-15H LATE POWER RECOVERY (15 HR) 82 PWR-REC-24H LATE POWER RECOVERY (24 HR) 83 RCPT       REACTOR COOLANT PUMPS TRIPPED 84 RCSPRESS   RCS PRESSURE LIMITED 85 REC-NSW     NSCW RECOVERY 86 REFILL     RWST REFILL 87 REFILL1     RWST REFILL 88 RHR         RESIDUAL HEAT REMOVAL 89 RPS         REACTOR TRIP 90 RPS-L       REACTOR SHUTDOWN 91 RSD         RAPID SECONDARY DEPRESSURIZATION (<1710 PSI IN 2 HR) 92 RSD-B       RAPID SECONDARY DEPRESS 93 RSD-L       RAPID SECONDARY DEPRESS 94 RXVESSEL   REACTOR VESSEL RUPTURES 95 SG-DEP-LT   DEPRESSURIZE SGs 96 SGI         FAULTED STEAM GENERATOR ISOLATION 97 SSC         COOLDOWN (PRIMARY & SECONDARY) 98 SSC1       COOLDOWN (PRIMARY & SECONDARY) 99 SSCR       SECONDARY SIDE COOLING RECOVERED
77 PWR-REC LATE POWER RECOVERY 78 PWR-REC-06H LATE POWER RECOVERY (6 HR) 79 PWR-REC-07H LATE POWER RECOVERY (7 HR) 80 PWR-REC-09H LATE POWER RECOVERY (9 HR) 81 PWR-REC-15H LATE POWER RECOVERY (15 HR) 82 PWR-REC-24H LATE POWER RECOVERY (24 HR) 83 RCPT REACTOR COOLANT PUMPS TRIPPED 84 RCSPRESS RCS PRESSURE LIMITED 85 REC-NSW NSCW RECOVERY 86 REFILL RWST REFILL 87 REFILL1 RWST REFILL 88 RHR RESIDUAL HEAT REMOVAL 89 RPS REACTOR TRIP 90 RPS-L REACTOR SHUTDOWN 91 RSD RAPID SECONDARY DEPRESSURIZATION (<1710 PSI IN 2 HR) 92 RSD-B RAPID SECONDARY DEPRESS 93 RSD-L RAPID SECONDARY DEPRESS 94 RXVESSEL REACTOR VESSEL RUPTURES 95 SG-DEP-LT DEPRESSURIZE SGs 96 SGI FAULTED STEAM GENERATOR ISOLATION 97 SSC COOLDOWN (PRIMARY & SECONDARY) 98 SSC1 COOLDOWN (PRIMARY & SECONDARY) 99 SSCR SECONDARY SIDE COOLING RECOVERED


Event Tree Initiator Description 1 ISL-HPI   IE-ISL-HPI Vogtle SI cold leg discharge ISLOCA 2 ISL-LPI   IE-ISL-LPI Vogtle RHR discharge ISLOCA 3 ISL-RHR   IE-ISL-RHR Vogtle RHR suction ISLOCA 4 LLOCA     IE-LLOCA   Vogtle large loss-of-coolant accident 5 LOACA     IE-LOACA   Vogtle loss of vital ac 1AA02 bus 6 LOACCW     IE-LOACCW Vogtle loss of auxiliary component cooling water 7 LOCHS     IE-LOCHS   Vogtle loss of condenser heat sink 8 LODCA     IE-LODCA   Vogtle loss of vital dc 1AD1 bus 9 LODCB     IE-LODCB   Vogtle loss of vital dc 1BD1 bus 10 LOMFW     IE-LOMFW   Vogtle loss of main feedwater 11 LONSW     IE-LONSW   Vogtle loss of nuclear service cooling water 12 LOOPGR     IE-LOOPGR Vogtle loss of offsite power (Grid related) 13 LOOPPC     IE-LOOPPC Vogtle loss of offsite power (Plant Centered) 14 LOOPSC     IE-LOOPSC Vogtle loss of offsite power (Switchyard centered) 15 LOOPWR     IE-LOOPWR Vogtle loss of offsite power (Weather related) 16 MLOCA     IE-MLOCA   Vogtle medium loss-of-coolant accident 17 RXVRUPT   IE-XLOCA   Vogtle reactor vessel rupture 18 SGTR       IE-SGTR   Vogtle steam generator tube rupture 19 SLOCA     IE-SLOCA   Vogtle small loss-of-coolant accident 20 TRANS     IE-TRANS   Vogtle general transient
Event Tree Initiator Description 1
ISL-HPI IE-ISL-HPI Vogtle SI cold leg discharge ISLOCA 2
ISL-LPI IE-ISL-LPI Vogtle RHR discharge ISLOCA 3
ISL-RHR IE-ISL-RHR Vogtle RHR suction ISLOCA 4
LLOCA IE-LLOCA Vogtle large loss-of-coolant accident 5
LOACA IE-LOACA Vogtle loss of vital ac 1AA02 bus 6
LOACCW IE-LOACCW Vogtle loss of auxiliary component cooling water 7
LOCHS IE-LOCHS Vogtle loss of condenser heat sink 8
LODCA IE-LODCA Vogtle loss of vital dc 1AD1 bus 9
LODCB IE-LODCB Vogtle loss of vital dc 1BD1 bus 10 LOMFW IE-LOMFW Vogtle loss of main feedwater 11 LONSW IE-LONSW Vogtle loss of nuclear service cooling water 12 LOOPGR IE-LOOPGR Vogtle loss of offsite power (Grid related) 13 LOOPPC IE-LOOPPC Vogtle loss of offsite power (Plant Centered) 14 LOOPSC IE-LOOPSC Vogtle loss of offsite power (Switchyard centered) 15 LOOPWR IE-LOOPWR Vogtle loss of offsite power (Weather related) 16 MLOCA IE-MLOCA Vogtle medium loss-of-coolant accident 17 RXVRUPT IE-XLOCA Vogtle reactor vessel rupture 18 SGTR IE-SGTR Vogtle steam generator tube rupture 19 SLOCA IE-SLOCA Vogtle small loss-of-coolant accident 20 TRANS IE-TRANS Vogtle general transient


IE-SGTR CDF Event Sequence     CDF   Description                                         AFW     HPI   Dry SG Flagset Tree 32 SGTR       12     8.23E-08 /RPS, /AFW, /HPI, SGI, REFILL1, ECA                                 Yes   ETF-SGTR 49 SGTR       19     2.84E-08 /RPS, AFW, /HPI, /SGI, FAB                         fails           Yes   ETF-SGTR 58 SGTR         9     1.72E-08 /RPS, /AFW, /HPI, /SGI, SSC, REFILL1, ECA                           Yes   ETF-SGTR 74 SGTR       22     8.88E-09 RPS                                                                 Yes   ETF-SGTR 83 SGTR       20     6.84E-09 /RPS, AFW, /HPI, SGI                               fails             ?   ETF-SGTR 106 SGTR       14     2.70E-09 /RPS, /AFW, HPI, /SGI, /SSC1, RHR                           fails Yes   ETF-SGTR 123 SGTR       18     1.97E-09 /RPS, AFW, /HPI, /SGI, /FAB, HPR                   fails           Yes   ETF-SGTR 167 SGTR         6     9.95E-10 /RPS, /AFW, /HPI, /SGI, /SSC, CSI, REFILL, ECA                     Yes   ETF-SGTR 238 SGTR       15     1.90E-10 /RPS, /AFW, HPI, /SGI, SSC1                                 fails Yes   ETF-SGTR 254 SGTR       21     1.44E-10 /RPS, AFW, HPI                                     fails   fails Yes   ETF-SGTR 287 SGTR       16     9.29E-11 /RPS, /AFW, HPI, SGI                                         fails   ?   ETF-SGTR 391 SGTR         3     1.76E-11 /RPS, /AFW, /HPI, /SGI, /SSC, /CSI, RHR, CST-REFILL                 Yes   ETF-SGTR Total=   1.50E-07 ECA       DECAY HEAT REMOVAL /RECOVERY (ECA-3.1/3.2)
IE-SGTR CDF Event Tree Sequence CDF Description AFW HPI Dry SG Flagset 32 SGTR 12 8.23E-08
REFILL   REFILL1   RWST REFILL SSC     SSC1       COOLDOWN (PRIMARY & SECONDARY)
/RPS, /AFW, /HPI, SGI, REFILL1, ECA Yes ETF-SGTR 49 SGTR 19 2.84E-08
CSI       TERMINATE OR CONTROL SAFETY INJECTION SGI       Faulted SG isolation IEV-SGTR =                                               2.07E-03 CCDP(SGTR) =                                             7.23E-05 CDF IEV-SGTR =                                           1.50E-07 CCDP(LSSB) =                                             1.45E-04 p(csgtr)LSSB =                                             0.02 IEV-LSSB) =                                               1.00E-03 CDF(LSSB and CSGTR) =                                     2.89E-09
/RPS, AFW, /HPI, /SGI, FAB fails Yes ETF-SGTR 58 SGTR 9
1.72E-08
/RPS, /AFW, /HPI, /SGI, SSC, REFILL1, ECA Yes ETF-SGTR 74 SGTR 22 8.88E-09 RPS Yes ETF-SGTR 83 SGTR 20 6.84E-09
/RPS, AFW, /HPI, SGI fails
?
ETF-SGTR 106 SGTR 14 2.70E-09
/RPS, /AFW, HPI, /SGI, /SSC1, RHR fails Yes ETF-SGTR 123 SGTR 18 1.97E-09
/RPS, AFW, /HPI, /SGI, /FAB, HPR fails Yes ETF-SGTR 167 SGTR 6
9.95E-10
/RPS, /AFW, /HPI, /SGI, /SSC, CSI, REFILL, ECA Yes ETF-SGTR 238 SGTR 15 1.90E-10
/RPS, /AFW, HPI, /SGI, SSC1 fails Yes ETF-SGTR 254 SGTR 21 1.44E-10
/RPS, AFW, HPI fails fails Yes ETF-SGTR 287 SGTR 16 9.29E-11
/RPS, /AFW, HPI, SGI fails
?
ETF-SGTR 391 SGTR 3
1.76E-11
/RPS, /AFW, /HPI, /SGI, /SSC, /CSI, RHR, CST-REFILL Yes ETF-SGTR Total=
1.50E-07 ECA DECAY HEAT REMOVAL /RECOVERY (ECA-3.1/3.2)
REFILL REFILL1 RWST REFILL SSC SSC1 COOLDOWN (PRIMARY & SECONDARY)
CSI TERMINATE OR CONTROL SAFETY INJECTION SGI Faulted SG isolation IEV-SGTR =
2.07E-03 CCDP(SGTR) =
7.23E-05 CDF IEV-SGTR =
1.50E-07 CCDP(LSSB) =
1.45E-04 p(csgtr)LSSB =
0.02 IEV-LSSB) =
1.00E-03 CDF(LSSB and CSGTR) =
2.89E-09


SGTR   LSSB and C-SGTR Comment on LSSB IEV frequency         2.07E-03     1.0E-03   Rare event, not expected to occur during plan CCDP                 7.23E-05     1.45E-04   2 times the CCDP of SGTR due to less favora p(csgtr)                             0.02     From Table 2.4-1 CDF                   1.50E-07       3.E-09 C-SGTR in SSB Event Tree C-SGTR IE-LSSB     RPS               CCDP of LSSB End State SSB No C-SGTR Success                             OK Occurs     ~1       C-SGTR 1.00E-03               0.02                   CD with C-SGTR 1.45E-04     3.E-09 Fails                               Transfer to ATWS ET small
SGTR LSSB and C-SGTR Comment on LSSB IEV frequency 2.07E-03 1.0E-03 Rare event, not expected to occur during plan CCDP 7.23E-05 1.45E-04 2 times the CCDP of SGTR due to less favora p(csgtr) 0.02 From Table 2.4-1 CDF 1.50E-07 3.E-09 C-SGTR in SSB Event Tree IE-LSSB RPS C-SGTR SSB CCDP of LSSB End State No C-SGTR Success OK Occurs
~1 C-SGTR 1.00E-03 0.02 CD with C-SGTR 1.45E-04 3.E-09 Fails Transfer to ATWS ET small


ATWS C-SGTR Models IE-TRANS     RPS           PR-REL               AFW     FL-DPT       P-L/R       CCDP                     End State                             IE-TRANS   RPS     PR-REL     FL-DPT   P-L/R CCDP       End State 1           2               3                 4           5         6           7                           8                                     1         2         3         4       5     6   7       8 Success                                                                               1     No ATWS                                             Success                                       1 No ATWS 1
ATWS C-SGTR Models IE-TRANS RPS PR-REL AFW FL-DPT P-L/R CCDP End State IE-TRANS RPS PR-REL FL-DPT P-L/R CCDP End State 1
Yes                                                                                                                                 Small                   2 No leak 0.95 Yes. 2200 <
2 3
Yes. 2200 < P< 3300                 Small                                    2      No leak                                                                    Medium                 3 CD-Leak P < 3300 Occurs                   0.95     0.04       1 1.00E-03 No       Medium                                   3     CD-Leak                                         1                           Large                 4 CD-C-SGTR Occurs                                                                                                                                                       Fails                   0.01       1   0.1 Large                                   4     CD-C-SGTR                                             1.00E-05 Fails                                                                                                                                                       No. P >3300                         5 CD- C-SGTR Yes                                                                                                                           0.02 No. P >3300 No                                                 5     CD-C-SGTR Figure 3-1. ATWS Event Tree Top Events to Address TypeII CSGTR IE-TRANS     RPS           PR-REL               AFW     FL-DPT       P-L/R       CCDP                     End State                                         IEV         RPS     PR-REL   AFW   p(sgtr)   End State 1           2               3                 4           5         6           7                           8 Success                             1 No ATWS Success                                                                               1     No ATWS 1                                                                                                                                                 Occurs                       Success         2 No C-SGTR Yes                                                       Insign. Challenge                                                         Success 0.5                                                                                                                                                           3 No C-SGTR Yes. 2200 < P< 3300                 Small                                   2     No leak                                                       Fails               Fails 9.50E-01                             0.95                                                                                                                                               4 C-SGTR No       Medium                                   3     CD-Leak               9.50E-10 assume SGTR                                                   0.01 Occurs                                       0.5       0.04         1.00E-02                                                                                                                               5 No C-SGTR 1                                                       Large                                   4     CD-C-SGTR             2.38E-09                                             Fails Fails                                         0.01         0.1                                                                                                                                   6 C-SGTR 5.00E-06                           Yes                                                                             1.25E-07                                                               0.05 No. P >3300               0.5 5.00E-02                   No                                                 5     CD-C-SGTR             1.25E-07 0.5 Sum =                 2.5E-07 Figure 32. ATWS Event Tree Top Events to Address TypeII CSGTR - Example Quantification This node represents the probability of getting a small, or a medium, or a large flaw depth, given a 5    FLDPT  flaw is originated since the last refueling outage. Any flaws of depth 40% or less are assumed identified and their tubes are plugged, if they have occurred before the last outage.
4 5
This node represents the probability of leak or CSGTR given that a flaw with depth specified in the 6    PL/R FLDPT node exists.
6 7
This is the CCDP assigned to the sequence defined so far with Node 1 through 6 in the event tree.
8 1
7    CCDP    This CCDP represents the additional failures needed to reach core damage end state, given that the sequence in question has progressed to the point defined by Nodes 1 through 6.
2 3
4 5
6 7
8 Success 1
No ATWS Success 1
No ATWS 1
Yes Small 2
No leak 0.95 Yes. 2200 < P< 3300 Small 2
No leak Yes. 2200 <
P < 3300 Medium 3
CD-Leak Occurs 0.95 0.04 1
1.00E-03 No Medium 3
CD-Leak 1
Large 4
CD-C-SGTR Occurs Fails 0.01 1
0.1 Large 4
CD-C-SGTR 1.00E-05 Fails No. P >3300 5
CD-C-SGTR Yes 0.02 No. P >3300 No 5
CD-C-SGTR Figure3-1. ATWS Event Tree Top Events to Address TypeII CSGTR IE-TRANS RPS PR-REL AFW FL-DPT P-L/R CCDP End State IEV RPS PR-REL AFW p(sgtr)
End State 1
2 3
4 5
6 7
8 Success 1
No ATWS Success 1
No ATWS 1
Occurs Success 2
No C-SGTR Yes Insign. Challenge Success 0.5 3
No C-SGTR Yes. 2200 < P< 3300 Small 2
No leak Fails Fails 9.50E-01 0.95 4
C-SGTR No Medium 3
CD-Leak 9.50E-10 assume SGTR 0.01 Occurs 0.5 0.04 1.00E-02 5
No C-SGTR 1
Large 4
CD-C-SGTR 2.38E-09 Fails Fails 0.01 0.1 6
C-SGTR 5.00E-06 Yes 1.25E-07 0.05 No. P >3300 0.5 5.00E-02 No 5
CD-C-SGTR 1.25E-07 0.5 Sum =
2.5E-07 Figure32. ATWS Event Tree Top Events to Address TypeII CSGTR - Example Quantification 5
FLDPT 6
PL/R 7
CCDP This node represents the probability of getting a small, or a medium, or a large flaw depth, given a flaw is originated since the last refueling outage. Any flaws of depth 40% or less are assumed identified and their tubes are plugged, if they have occurred before the last outage.
This node represents the probability of leak or CSGTR given that a flaw with depth specified in the FLDPT node exists.
This is the CCDP assigned to the sequence defined so far with Node1 through6 in the event tree.
This CCDP represents the additional failures needed to reach core damage end state, given that the sequence in question has progressed to the point defined by Nodes1 through6.


RCP Seal LOCA Model in SPAR LOSC                         RCP SEAL COOLING MAINTAINED RCPT                         REACTOR COOLANT PUMPS TRIPPED RCSPRESS                     RCS PRESSURE LIMITED RAPID SECONDARY DEPRESSURIZATION RSD
RCP Seal LOCA Model in SPAR LOSC RCP SEAL COOLING MAINTAINED RCPT REACTOR COOLANT PUMPS TRIPPED RCSPRESS RCS PRESSURE LIMITED RSD RAPID SECONDARY DEPRESSURIZATION
(<1710 PSI IN 2 HR) 480 gpm/pump seal LOCA occurs if LOSP and RCPT OR if LOSC and BP1 and BP2. Then, loop seal clearing occurs.
(<1710 PSI IN 2 HR) 480 gpm/pump seal LOCA occurs if LOSP and RCPT OR if LOSC and BP1 and BP2. Then, loop seal clearing occurs.


Table 2.3-1. Probability that a Detected Flaw Belongs to a Bin Size Flaw Length 0 to 1 cm 1 to 2 cm 2 to 3 cm 3 to 4 cm 4 to 5 cm 5 to 6 cm        Total 0 to 0.1     2.74E-03   4.62E-02   2.23E-02   5.38E-03   1.04E-03   1.80E-04   7.78E-02 Flaw Depth %/100 0.1 to 0.2   1.86E-02   3.14E-01   1.52E-01   3.66E-02   7.08E-03   1.23E-03   5.30E-01 0.2 to 0.3   9.59E-03   1.62E-01   7.81E-02   1.89E-02   3.64E-03   6.31E-04   2.73E-01 0.3 to 0.4   3.09E-03   5.21E-02   2.52E-02   6.07E-03   1.17E-03   2.03E-04   8.78E-02   8.78E-02 0.4 to 0.5   8.47E-04   1.43E-02   6.90E-03   1.66E-03   3.22E-04   5.57E-05   2.41E-02   2.41E-02 0.5 to 0.6   2.14E-04   3.61E-03   1.74E-03   4.21E-04   8.13E-05   1.41E-05   6.08E-03   6.08E-03 0.6 to 0.7   5.14E-05   8.67E-04   4.19E-04   1.01E-04   1.95E-05   3.38E-06   1.46E-03   1.46E-03   5.43E-04 0.7 to 0.8   1.19E-05   2.01E-04   9.73E-05   2.35E-05   4.54E-06   7.86E-07   3.39E-04   3.39E-04   1.26E-04 0.8 to 0.9   2.71E-06   4.57E-05   2.21E-05   5.32E-06   1.03E-06   1.78E-07   7.70E-05   7.70E-05   2.86E-05 0.9 to 1.0     small Total  3.51E-02   5.93E-01 2.87E-01 6.92E-02 1.34E-02 2.32E-03 1.00E+00 1.00E+00 1.20E-01 6.98E-04}}
Table 2.3-1. Probability that a Detected Flaw Belongs to a Bin Size 0to 1cm 1to 2cm 2to 3cm 3to 4cm 4to 5cm 5to 6cm 0 to 0.1 2.74E-03 4.62E-02 2.23E-02 5.38E-03 1.04E-03 1.80E-04 7.78E-02 0.1 to 0.2 1.86E-02 3.14E-01 1.52E-01 3.66E-02 7.08E-03 1.23E-03 5.30E-01 0.2 to 0.3 9.59E-03 1.62E-01 7.81E-02 1.89E-02 3.64E-03 6.31E-04 2.73E-01 0.3 to 0.4 3.09E-03 5.21E-02 2.52E-02 6.07E-03 1.17E-03 2.03E-04 8.78E-02 8.78E-02 0.4 to 0.5 8.47E-04 1.43E-02 6.90E-03 1.66E-03 3.22E-04 5.57E-05 2.41E-02 2.41E-02 0.5 to 0.6 2.14E-04 3.61E-03 1.74E-03 4.21E-04 8.13E-05 1.41E-05 6.08E-03 6.08E-03 0.6 to 0.7 5.14E-05 8.67E-04 4.19E-04 1.01E-04 1.95E-05 3.38E-06 1.46E-03 1.46E-03 5.43E-04 0.7 to 0.8 1.19E-05 2.01E-04 9.73E-05 2.35E-05 4.54E-06 7.86E-07 3.39E-04 3.39E-04 1.26E-04 0.8 to 0.9 2.71E-06 4.57E-05 2.21E-05 5.32E-06 1.03E-06 1.78E-07 7.70E-05 7.70E-05 2.86E-05 0.9 to 1.0 small 3.51E-02 5.93E-01 2.87E-01 6.92E-02 1.34E-02 2.32E-03 1.00E+00 1.00E+00 1.20E-01 6.98E-04 Total Flaw Length Total Flaw Depth %/100}}

Latest revision as of 08:55, 5 January 2025

C-SGTR RASP Handbook Vol 5 Worksheet CDF Sequences to Estimate LERF Public v3
ML18337A398
Person / Time
Issue date: 12/04/2018
From:
NRC/NRR/DRA/APOB
To:
References
Download: ML18337A398 (14)
v • d • e


Text

This excel file is to provide the CDF sequences and calculation summary for the SPAR model example that was used to estimate LERF from C-SGTR sequences as documented in Appendix 2-D of the RASP Handbook Volume 5.

Table D-2 Summary Table 07/27/2017 Category In 38 CDF seqs.

in Residue (seqs.39-711)

Total CDF subject to csgtr challenge p(csgtr)

CDF (csgtr)

LERF (csgtr)

Plant CDF =

2.95E-05 1.15E-06 3.07E-05 96.26%

1 HDL no RCS loop clearing 4.90E-06 1.90E-07 5.09E-06 0.024 1.2E-07 1.2E-07 2

HDL with RCS loop clearing 2.09E-07 8.13E-09 1.00E-08 1

1.0E-08 1.0E-08 3

Non HDL CDF with subsumed FSG 0.05 3.3E-08 3.3E-08 4

ATWS with failure of pressure relief 3.79E-07 1.47E-08 3.94E-07 0.05 2.0E-08 2.0E-08 5

Large SSB 0.02 3.0E-09 3.0E-09 Totals =

5.49E-06 1.9E-07 1.9E-07

% of plant CDF 18%

0.6%

Note: No CAT-2 sequences were in the top 38 sequences. An examination of lower CDF sequences indicated that CAT-2 frequency is expected to be at the order of 1E-08, which is used in this table.

A more rigourous calculation can be done by examining the cutsets with B1 and B2 seal failures coincident with AFW failures.

3.9E-09 This EXCEL file RASP Manual Section referring to this document.

Sequence List (4)

C-SGTR RASP Handbook worksheet CDF sequences to estimate LERF Public v2.xlsx 3

12/03/2018

==

Conclusion:==

For this selected example plant CDF model, based on the top 33 CDF sequences, about 18% of the CDF would be subject to C-SGTR, as shown below.

These top 33 sequences make up 96% of total plant CDF from internal events.

CDF Seqs 1-38 2.95E-05 04/24/2015 0:00 HDL Cat-1 only in 1-38 4.90E-06 VOGTLE SPAR MODEL Dominant Sequence Results HDL Cat-2 only in 1-38 2.09E-07 1-38 39-711 1-711 Cat-4 only in 1-38 3.79E-07 Totals=

3.07E-05 Plant CDF = 2.95E-05 1.15E-06 3.07E-05 Plant CDF % =

96.26%

3.74%

100.00%

Event Tree Sequence CDF Description AFW LOOP EDG RCS Pressure

(/RSD or LPI)

RCP

SLOCA, OR LOCA Category
RPS, RCSPRESS 1

LONSW 04-02-10 1.67E-05 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,

/RCPT, /RSD, /BP1, BP2, HPI, SSC1 low 182 gpm OK-1 2

LOACA 20 2.50E-06

/RPS, AFW, MFW, FAB Fails high cat-1 3

LOACA 02-02-03 2.23E-06

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI,

/SSC, RHR, LPR low 182 gpm OK-1 4

LOACA 02-02-09 1.91E-06

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI,

/SSC1, LPI low 182 gpm OK-1 5

LONSW 04-03-10 8.36E-07 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,

/RCPT, /RSD, BP1, /BP2, HPI, SSC1 high 76 gpm OK-1 6

LOACA 19 5.74E-07

/RPS, AFW, MFW, /FAB, SSCR, HPR Fails high cat-1 7

ISL-RHR 3

3.89E-07 ISL-RPT-RHR, /ISL-DIAG, ISL-REC-RHR ISL low OK-3 8

TRANS 21-16 3.79E-07 RPS, RCSPRESS ATWS high cat-4 ATWS Pres.

Spike 9

MLOCA 03 3.49E-07

/RPS, /HPI-ML, /AFW-ATWS, /SSC, HPR, LPR low MLOCA OK-2 10 TRANS 20 3.15E-07

/RPS, AFW, MFW, FAB Fails high cat-1 11 LOOPWR 16-03-10 2.61E-07

/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, /BP2, OPR-04H, DGR-04H, AFW-MAN, SG-DEP-LT Fails Loop Fails high 21 gpm cat-1 12 LOOPWR 16-06 2.18E-07

/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, OPR-04H, DGR-04H Late fails Loop Fails high 182 gpm cat-1 13 LONSW 04-04-10 2.09E-07 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,

/RCPT, /RSD, BP1, BP2, HPI-ML, /ACC, /AFW-ATWS, /SSC, LPI lsc 480 gpm cat-2 14 LOOPGR 15 2.08E-07

/RPS-L, /EPS, AFW-L, FAB-L Fails Loop high cat-1 15 LOOPGR 16-03-10 1.73E-07

/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, /BP2, OPR-04H, DGR-04H, AFW-MAN, SG-DEP-LT Fails Loop Fails high 21 gpm cat-1 16 LOOPWR 16-45 1.64E-07

/RPS-L, EPS, AFW-B, OPR-04H, DGR-04H Fails Loop Fails high cat-1 17 ISL-RHR 4

1.50E-07 ISL-RPT-RHR, ISL-DIAG ISL low OK-3 18 LOOPGR 16-06 1.44E-07

/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, OPR-04H, DGR-04H Late fails Loop Fails high 182 gpm cat-1 19 LODCA 02-02-03 1.21E-07

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI,

/SSC, RHR, LPR low 182 gpm OK-1 20 TRANS 02-02-09 1.19E-07

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI,

/SSC1, LPI low 182 gpm OK-1 21 LOOPSC 15 1.13E-07

/RPS-L, /EPS, AFW-L, FAB-L Fails Loop cat-1 22 LOACA 02-03-03 1.12E-07

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, BP1, /BP2, /HPI,

/SSC, RHR, LPR low 76 gpm OK-1 23 LODCA 02-02-09 1.09E-07

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI,

/SSC1, LPI low 182 gpm OK-1 24 LOOPGR 16-45 1.08E-07

/RPS-L, EPS, AFW-B, OPR-04H, DGR-04H Fails Loop Fails cat-1 25 LODCB 02-02-09 1.06E-07

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI,

/SSC1, LPI low 182 gpm OK-1 26 RXVRUPT 2

1.00E-07 RXVESSEL OK-4 27 MLOCA 10 9.74E-08

/RPS, HPI-ML, /ACC, /AFW-ATWS, /SSC, LPI low MLOCA OK-2

Sequence List (4)

C-SGTR RASP Handbook worksheet CDF sequences to estimate LERF Public v2.xlsx 4

12/03/2018 28 LOACA 02-03-09 9.54E-08

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, BP1, /BP2, HPI,

/SSC1, LPI low 76 gpm OK-1 29 LONSW 04-14-10 8.46E-08 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW, RCPT, HPI-ML, /ACC, /AFW-ATWS, /SSC, LPI low OK-1 30 LOOPGR 02-02-09 8.46E-08

/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2,

/OPR-02H, /RPS, /AFW, HPI, /SSC1, LPI Loop low 76 gpm OK-1 31 SLOCA 03 8.38E-08

/RPS, /AFW, /HPI, /SSC, RHR, LPR low SLOCA OK-1 32 SGTR 12 8.23E-08

/RPS, /AFW, /HPI, SGI, REFILL1, ECA SGTR 33 TRANS 02-02-03 7.91E-08

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI,

/SSC, RHR, LPR low 76 gpm OK-1 34 LOOPSC 02-02-09 7.21E-08

/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2,

/OPR-02H, /RPS, /AFW, HPI, /SSC1, LPI Loop 182 gpm OK-1 35 LOOPWR 15 6.64E-08

/RPS-L, /EPS, AFW-L, FAB-L Fails Loop cat-1 36 TRANS 21-14 6.24E-08 RPS, /RCSPRESS, MFW, /AFW-ATWS, BORATION ATWS 37 LODCB 02-02-03 5.57E-08

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, /HPI,

/SSC, RHR, LPR low OK-1 38 LOMFW 20 5.44E-08

/RPS, AFW, MFW, FAB Fails cat-1 39 LOACA 02-04-12 5.18E-08

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, BP1, BP2, HPI-ML,

/ACC, AFW-ATWS Fails 480 gpm 40 LOOPGR 16-10-2 4.81E-08

/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, BP1, BP2, /OPR-02H,

/HPI, /SSC, LPR Loop Fails 480 gpm 41 LOCHS 12 4.62E-08

/RPS, AFW, FAB Fails cat-1 42 LOOPSC 16-10-2 4.10E-08

/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, BP1, BP2, /OPR-02H,

/HPI, /SSC, LPR Loop Fails 480 gpm 43 LOOPGR 16-04-2 4.07E-08

/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, /OPR-04H,

/HPI, /SSC, LPR Loop Fails 44 LOOPGR 16-04-7 4.00E-08

/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, BP2, /OPR-04H, HPI, /SSC, LPI Loop Fails 45 LOACA 02-02-10 3.82E-08

/RPS, /AFW, /PORV, LOSC, /RCPT, /RSD, /BP1, BP2, HPI, SSC1 46 LOMFW 21-16 3.79E-08 RPS, RCSPRESS cat-4 Pres. Spike 47 LOCHS 13-16 3.22E-08 RPS, RCSPRESS cat-4 Pres. Spike 48 LOACA 21-15 2.86E-08 RPS, /RCSPRESS, MFW, AFW-ATWS Fails 49 SGTR 19 2.84E-08

/RPS, AFW, /HPI, /SGI, FAB Fails SGTR 50 LOOPWR 02-02-09 2.71E-08

/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2,

/OPR-02H, /RPS, /AFW, HPI, /SSC1, LPI Loop 51 LOOPGR 02-05 2.60E-08

/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD-L, /BP1, BP2, OPR-02H, HPI-L Loop 52 ISL-LPI 3

2.27E-08 ISL-RPT-LPI, /ISL-DIAG, ISL-REC-LPI ISL low 53 LOACA 02-14-12 2.12E-08

/RPS, /AFW, /PORV, LOSC, RCPT, HPI-ML, /ACC, AFW-ATWS Fails 54 LOOPPC 15 2.08E-08

/RPS-L, /EPS, AFW-L, FAB-L Fails Loop cat-1 55 LOOPSC 16-03-10 1.99E-08

/RPS-L, EPS, /AFW-B, /PORV, /RSD-B, /BP1, /BP2, OPR-04H, DGR-04H, AFW-MAN, SG-DEP-LT Fails Loop Fails 56 LODCB 20 1.86E-08

/RPS, AFW, MFW, FAB Fails 57 LLOCA 2

1.79E-08

/ACC, /LPI, LPR-LL LLOCA OK-2 58 SGTR 09 1.72E-08

/RPS, /AFW, /HPI, /SGI, SSC, REFILL1, ECA 59 LONSW 04-06-10 1.67E-08 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,

/RCPT, RSD, /BP1, /O1, /BP2, O2, HPI, SSC1 60 LONSW 04-08-10 1.67E-08 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,

/RCPT, RSD, /BP1, O1, /BP2, /O2, HPI, SSC1 61 LONSW 04-09-10 1.67E-08 IEFT-LONSCW, /RPS, /AFW, /PORV, LOSC-NSW, REC-NSW,

/RCPT, RSD, /BP1, O1, /BP2, O2, HPI, SSC1

Sequence List (4)

C-SGTR RASP Handbook worksheet CDF sequences to estimate LERF Public v2.xlsx 5

12/03/2018 OK-1 No C-SGTR challenge because AFW OK; RSD OK (RHR pump operation pressure range is reached in RCS).

OK-2 No C-SGTR challenge because of MLOCA or LLOCA; RCS pressure is not high.

OK-3 No C-SGTR since: AFW is most likely OK (not querried in the ET); RCS likely depressurized either by break size or by operator action.

OK-4 No C-SGTR since low RCS pressure due to vessel failure RSD = Rapid secondary depressurization.

SSC = Cooldown (primary and secondary)

LOSC = RCP seal cooling maintained

Fault Tree Description 1

ACC ACCUMULATOR 3-OF-3 2

AFW AUXILIARY FEEDWATER 3

AFW-ATWS AUXILIARY FEEDWATER 4

AFW-B AUXILIARY FEEDWATER (BLACKOUT) 5 AFW-L VOGTLE AFW USING LOOP-FTF FAULT TREE FLAGS FAULT TREE 6

AFW-MAN MANUAL CONTROL AFW 7

BORATION EMERGENCY BORATION 8

BP1 RCP SEAL STAGE 1 INTEGRITY (BINDING/POPPING) 9 BP2 RCP SEAL STAGE 2 INTEGRITY (BINDING/POPPING) 10 CSI TERMINATE OR CONTROL SAFETY INJECTION 11 CST-REFILL CONDENSATE STORAGE TANK REFILL 12 CST-REFILL-LT CONDENSATE STORAGE TANK REFILL LONG-TERM 13 CST-REFILL-LT1 CONDENSATE STORAGE TANK REFILL LONG-TERM 14 DGR-01H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 1 HOUR 15 DGR-02H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 2 HOURS 16 DGR-03H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 3 HOURS 17 DGR-04H DIESEL GENERATOR RECOVERY (IN 4 HR) 18 DGR-06H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 6 HOURS 19 DGR-08H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 8 HOURS 20 DGR-30M OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 30 MINUTES 21 ECA DECAY HEAT REMOVAL /RECOVERY (ECA-3.1/3.2) 22 EPS EMERGENCY POWER 23 FAB FEED AND BLEED 24 FAB-L VOGTLE FEED AND BLEED IS UNAVAILABLE using LOOP-FTF 25 FAB-NSW FEED AND BLEED IS UNAVAILABLE USING LONSW-FTF 26 FAB2 FEED AND BLEED (1 PORV REQUIRED) 27 HPI HIGH PRESSURE INJECTION 28 HPI-L HIGH PRESSURE INJECTION 29 HPI-ML HIGH PRESSURE INJECTION 30 HPR HIGH PRESSURE RECIRC 31 HPR-L HIGH PRESSURE RECIRC 32 HPR-ML HIGH PRESSURE RECIRCULATION 33 HPR1 HIGH PRESSURE RECIRCULATION 34 IE-ISL-HPI ISLOCA IE 2-CKV HPI interface 35 IE-ISL-LPI ISLOCA IE 2-CKV LPI interface 36 IE-ISL-RHR RHR pipe ruptures

37 IE-LOACCW LOSS OF AUXILIARY COMPONENT COOLING WATER 38 IE-LONSW LOSS OF NUCLEAR SERVICE COOLING WATER 39 IE-LOOP LOSS OF OFFSITE POWER 40 IE-SGTR SG TUBE RUPTURE 41 IE-SLBIC STEAMLINE BREAK INSIDE CONTAINMENT INITIATOR 42 IEFT-LOACW AUXILIARY COMPONENT COOLING WATER (IE FT) 43 IEFT-LONSCW NUCLEAR SERVICE COOLING WATER (IE FAULT TREE) 44 ISL-DIAG Operators fail to diagnose ISLOCA 45 ISL-REC-HPI Operators fail to recover (isolate) ISLOCA 46 ISL-REC-LPI Operators fail to recover (isolate) ISLOCA 47 ISL-REC-RHR Operators fail to recover (isolate) ISLOCA 48 ISL-RPT-HPI HPI pipe ruptures 49 ISL-RPT-LPI LPI pipe ruptures 50 ISL-RPT-RHR RHR/SDC pipe ruptures 51 LOSC RCP SEAL COOLING MAINTAINED 52 LOSC-ACCW LOSS OF SEAL COOLING 53 LOSC-L VOGTLE RCPSL USING LOOP-FTF FAULT TREE FLAGS 54 LOSC-NSW LOSS OF SEAL COOLING 55 LOSC-TT LOSS OF SEAL COOLING (TURBINE TRIP) 56 LPI LOW PRESSURE INJECTION 57 LPI-NSW LOW PRESSURE INJECTION - LONSW 58 LPR LOW PRESSURE RECIRC 59 LPR-LL LOW PRESSURE RECIRCULATION 60 LPR-NSW LOW PRESSURE RECIRCULATION - LONSW 61 MFW MAIN FEEDWATER 62 O1 RCP SEAL STAGE 1 INTEGRITY (O-RING EXTRUSION) 63 O2 RCP SEAL STAGE 2 INTEGRITY (O-RING EXTRUSION) 64 OPR OFFSITE POWER RECOVERY 65 OPR-01H OPERATOR FAILS TO RECOVER OFFSITE POWER IN 1 HOUR 66 OPR-02H OFFSITE POWER RECOVERY IN 2 HRS 67 OPR-03H OPERATOR FAILS TO RECOVER OFFSITE POWER IN 3 HOURS 68 OPR-04H OFFSITE POWER RECOVERY (IN 4 HR) 69 OPR-06H OFFSITE POWER RECOVERY IN 6 HRS 70 OPR-08H OPERATOR FAILS TO RECOVER OFFSITE POWER IN 8 HOURS 71 OPR-30M OPERATOR FAILS TO RECOVER OFFSITE POWER IN 30 MINUTES 72 PORV PORVs ARE CLOSED 73 PORV-B VOGTLE PORVs/SRVs OPEN DURING STATION BLACKOUT 74 PORV-L VOGTLE PORVs/SRVs OPEN DURING LOOP 75 PORV1 VOGTLE PORVS/SRVS OPEN DURING TRANSIENTS (AFW FAILED) 76 PORV2 PORVs ARE CLOSED

77 PWR-REC LATE POWER RECOVERY 78 PWR-REC-06H LATE POWER RECOVERY (6 HR) 79 PWR-REC-07H LATE POWER RECOVERY (7 HR) 80 PWR-REC-09H LATE POWER RECOVERY (9 HR) 81 PWR-REC-15H LATE POWER RECOVERY (15 HR) 82 PWR-REC-24H LATE POWER RECOVERY (24 HR) 83 RCPT REACTOR COOLANT PUMPS TRIPPED 84 RCSPRESS RCS PRESSURE LIMITED 85 REC-NSW NSCW RECOVERY 86 REFILL RWST REFILL 87 REFILL1 RWST REFILL 88 RHR RESIDUAL HEAT REMOVAL 89 RPS REACTOR TRIP 90 RPS-L REACTOR SHUTDOWN 91 RSD RAPID SECONDARY DEPRESSURIZATION (<1710 PSI IN 2 HR) 92 RSD-B RAPID SECONDARY DEPRESS 93 RSD-L RAPID SECONDARY DEPRESS 94 RXVESSEL REACTOR VESSEL RUPTURES 95 SG-DEP-LT DEPRESSURIZE SGs 96 SGI FAULTED STEAM GENERATOR ISOLATION 97 SSC COOLDOWN (PRIMARY & SECONDARY) 98 SSC1 COOLDOWN (PRIMARY & SECONDARY) 99 SSCR SECONDARY SIDE COOLING RECOVERED

Event Tree Initiator Description 1

ISL-HPI IE-ISL-HPI Vogtle SI cold leg discharge ISLOCA 2

ISL-LPI IE-ISL-LPI Vogtle RHR discharge ISLOCA 3

ISL-RHR IE-ISL-RHR Vogtle RHR suction ISLOCA 4

LLOCA IE-LLOCA Vogtle large loss-of-coolant accident 5

LOACA IE-LOACA Vogtle loss of vital ac 1AA02 bus 6

LOACCW IE-LOACCW Vogtle loss of auxiliary component cooling water 7

LOCHS IE-LOCHS Vogtle loss of condenser heat sink 8

LODCA IE-LODCA Vogtle loss of vital dc 1AD1 bus 9

LODCB IE-LODCB Vogtle loss of vital dc 1BD1 bus 10 LOMFW IE-LOMFW Vogtle loss of main feedwater 11 LONSW IE-LONSW Vogtle loss of nuclear service cooling water 12 LOOPGR IE-LOOPGR Vogtle loss of offsite power (Grid related) 13 LOOPPC IE-LOOPPC Vogtle loss of offsite power (Plant Centered) 14 LOOPSC IE-LOOPSC Vogtle loss of offsite power (Switchyard centered) 15 LOOPWR IE-LOOPWR Vogtle loss of offsite power (Weather related) 16 MLOCA IE-MLOCA Vogtle medium loss-of-coolant accident 17 RXVRUPT IE-XLOCA Vogtle reactor vessel rupture 18 SGTR IE-SGTR Vogtle steam generator tube rupture 19 SLOCA IE-SLOCA Vogtle small loss-of-coolant accident 20 TRANS IE-TRANS Vogtle general transient

IE-SGTR CDF Event Tree Sequence CDF Description AFW HPI Dry SG Flagset 32 SGTR 12 8.23E-08

/RPS, /AFW, /HPI, SGI, REFILL1, ECA Yes ETF-SGTR 49 SGTR 19 2.84E-08

/RPS, AFW, /HPI, /SGI, FAB fails Yes ETF-SGTR 58 SGTR 9

1.72E-08

/RPS, /AFW, /HPI, /SGI, SSC, REFILL1, ECA Yes ETF-SGTR 74 SGTR 22 8.88E-09 RPS Yes ETF-SGTR 83 SGTR 20 6.84E-09

/RPS, AFW, /HPI, SGI fails

?

ETF-SGTR 106 SGTR 14 2.70E-09

/RPS, /AFW, HPI, /SGI, /SSC1, RHR fails Yes ETF-SGTR 123 SGTR 18 1.97E-09

/RPS, AFW, /HPI, /SGI, /FAB, HPR fails Yes ETF-SGTR 167 SGTR 6

9.95E-10

/RPS, /AFW, /HPI, /SGI, /SSC, CSI, REFILL, ECA Yes ETF-SGTR 238 SGTR 15 1.90E-10

/RPS, /AFW, HPI, /SGI, SSC1 fails Yes ETF-SGTR 254 SGTR 21 1.44E-10

/RPS, AFW, HPI fails fails Yes ETF-SGTR 287 SGTR 16 9.29E-11

/RPS, /AFW, HPI, SGI fails

?

ETF-SGTR 391 SGTR 3

1.76E-11

/RPS, /AFW, /HPI, /SGI, /SSC, /CSI, RHR, CST-REFILL Yes ETF-SGTR Total=

1.50E-07 ECA DECAY HEAT REMOVAL /RECOVERY (ECA-3.1/3.2)

REFILL REFILL1 RWST REFILL SSC SSC1 COOLDOWN (PRIMARY & SECONDARY)

CSI TERMINATE OR CONTROL SAFETY INJECTION SGI Faulted SG isolation IEV-SGTR =

2.07E-03 CCDP(SGTR) =

7.23E-05 CDF IEV-SGTR =

1.50E-07 CCDP(LSSB) =

1.45E-04 p(csgtr)LSSB =

0.02 IEV-LSSB) =

1.00E-03 CDF(LSSB and CSGTR) =

2.89E-09

SGTR LSSB and C-SGTR Comment on LSSB IEV frequency 2.07E-03 1.0E-03 Rare event, not expected to occur during plan CCDP 7.23E-05 1.45E-04 2 times the CCDP of SGTR due to less favora p(csgtr) 0.02 From Table 2.4-1 CDF 1.50E-07 3.E-09 C-SGTR in SSB Event Tree IE-LSSB RPS C-SGTR SSB CCDP of LSSB End State No C-SGTR Success OK Occurs

~1 C-SGTR 1.00E-03 0.02 CD with C-SGTR 1.45E-04 3.E-09 Fails Transfer to ATWS ET small

ATWS C-SGTR Models IE-TRANS RPS PR-REL AFW FL-DPT P-L/R CCDP End State IE-TRANS RPS PR-REL FL-DPT P-L/R CCDP End State 1

2 3

4 5

6 7

8 1

2 3

4 5

6 7

8 Success 1

No ATWS Success 1

No ATWS 1

Yes Small 2

No leak 0.95 Yes. 2200 < P< 3300 Small 2

No leak Yes. 2200 <

P < 3300 Medium 3

CD-Leak Occurs 0.95 0.04 1

1.00E-03 No Medium 3

CD-Leak 1

Large 4

CD-C-SGTR Occurs Fails 0.01 1

0.1 Large 4

CD-C-SGTR 1.00E-05 Fails No. P >3300 5

CD-C-SGTR Yes 0.02 No. P >3300 No 5

CD-C-SGTR Figure3-1. ATWS Event Tree Top Events to Address TypeII CSGTR IE-TRANS RPS PR-REL AFW FL-DPT P-L/R CCDP End State IEV RPS PR-REL AFW p(sgtr)

End State 1

2 3

4 5

6 7

8 Success 1

No ATWS Success 1

No ATWS 1

Occurs Success 2

No C-SGTR Yes Insign. Challenge Success 0.5 3

No C-SGTR Yes. 2200 < P< 3300 Small 2

No leak Fails Fails 9.50E-01 0.95 4

C-SGTR No Medium 3

CD-Leak 9.50E-10 assume SGTR 0.01 Occurs 0.5 0.04 1.00E-02 5

No C-SGTR 1

Large 4

CD-C-SGTR 2.38E-09 Fails Fails 0.01 0.1 6

C-SGTR 5.00E-06 Yes 1.25E-07 0.05 No. P >3300 0.5 5.00E-02 No 5

CD-C-SGTR 1.25E-07 0.5 Sum =

2.5E-07 Figure32. ATWS Event Tree Top Events to Address TypeII CSGTR - Example Quantification 5

FLDPT 6

PL/R 7

CCDP This node represents the probability of getting a small, or a medium, or a large flaw depth, given a flaw is originated since the last refueling outage. Any flaws of depth 40% or less are assumed identified and their tubes are plugged, if they have occurred before the last outage.

This node represents the probability of leak or CSGTR given that a flaw with depth specified in the FLDPT node exists.

This is the CCDP assigned to the sequence defined so far with Node1 through6 in the event tree.

This CCDP represents the additional failures needed to reach core damage end state, given that the sequence in question has progressed to the point defined by Nodes1 through6.

RCP Seal LOCA Model in SPAR LOSC RCP SEAL COOLING MAINTAINED RCPT REACTOR COOLANT PUMPS TRIPPED RCSPRESS RCS PRESSURE LIMITED RSD RAPID SECONDARY DEPRESSURIZATION

(<1710 PSI IN 2 HR) 480 gpm/pump seal LOCA occurs if LOSP and RCPT OR if LOSC and BP1 and BP2. Then, loop seal clearing occurs.

Table 2.3-1. Probability that a Detected Flaw Belongs to a Bin Size 0to 1cm 1to 2cm 2to 3cm 3to 4cm 4to 5cm 5to 6cm 0 to 0.1 2.74E-03 4.62E-02 2.23E-02 5.38E-03 1.04E-03 1.80E-04 7.78E-02 0.1 to 0.2 1.86E-02 3.14E-01 1.52E-01 3.66E-02 7.08E-03 1.23E-03 5.30E-01 0.2 to 0.3 9.59E-03 1.62E-01 7.81E-02 1.89E-02 3.64E-03 6.31E-04 2.73E-01 0.3 to 0.4 3.09E-03 5.21E-02 2.52E-02 6.07E-03 1.17E-03 2.03E-04 8.78E-02 8.78E-02 0.4 to 0.5 8.47E-04 1.43E-02 6.90E-03 1.66E-03 3.22E-04 5.57E-05 2.41E-02 2.41E-02 0.5 to 0.6 2.14E-04 3.61E-03 1.74E-03 4.21E-04 8.13E-05 1.41E-05 6.08E-03 6.08E-03 0.6 to 0.7 5.14E-05 8.67E-04 4.19E-04 1.01E-04 1.95E-05 3.38E-06 1.46E-03 1.46E-03 5.43E-04 0.7 to 0.8 1.19E-05 2.01E-04 9.73E-05 2.35E-05 4.54E-06 7.86E-07 3.39E-04 3.39E-04 1.26E-04 0.8 to 0.9 2.71E-06 4.57E-05 2.21E-05 5.32E-06 1.03E-06 1.78E-07 7.70E-05 7.70E-05 2.86E-05 0.9 to 1.0 small 3.51E-02 5.93E-01 2.87E-01 6.92E-02 1.34E-02 2.32E-03 1.00E+00 1.00E+00 1.20E-01 6.98E-04 Total Flaw Length Total Flaw Depth %/100

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