ML121210463
| ML121210463 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 06/01/2012 |
| From: | Keith Tetter NRC/RES/DRA/PRB |
| To: | |
| Tetter Keith, 301-251-7605 | |
| Shared Package | |
| ML121210435 | List: |
| References | |
| LER 280/11-001, IR-11-003 | |
| Download: ML121210463 (21) | |
Text
Enclosure 1
Final Precursor Analysis Accident Sequence Precursor Program - Office of Nuclear Regulatory Research Surry Power Station, Unit 1 and 2 Dual Unit Loss of Offsite Power Due to Switchyard Damage Caused by a Tornado Event Date: 04/16/2011 LER: 280/11-001 IR: 50-280/11-03 Unit 1 CCDP =
Unit 2 CCDP =
9x10-5 7x10-5 EVENT
SUMMARY
Event Description. At 1849 on April 16, 2011, Surry Power Station Units 1 and 2 experienced a complete loss of offsite power (LOOP) to the Reserve Station Service Transformers (RSSTs)
A and B, for about 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> and 3 minutes. This condition resulted from damage inflicted in the switchyard from a tornado. This resulted in a turbine trip and subsequent reactor trip.
Emergency Diesel Generators (EDGs) auto started and loaded. Due to the station blackout (SBO) signal, the circulating water outlet motor operator valves throttled closed to approximately 25% open and the Alternate AC (AAC) Diesel Generator automatically started as designed. In addition, the auxiliary feedwater (AFW) pumps started and all reactor coolant pump (RCP) motors tripped as designed.
The swing EDG, EDG 3, automatically loaded onto the Unit 1 Emergency Bus 1J leaving the Unit 2 Emergency Bus 2J de-energized as designed. At 1917, EDG 3 was transferred to Bus 2J and the AAC Diesel Generator was aligned to Bus 1J, thus providing power to all emergency buses. At 2352, RSSTs A and B were energized by offsite power. On April 17th, at 0035, offsite power was restored to Bus 1J. At 0153, offsite power was restored to the Unit 2 Emergency Bus 2H. Offsite power was restored to the two remaining Emergency Buses, 1H and 2J on April 17, 2011 at 1803 and 2109, respectively. Additional information is provided in References 1 and 2.
Key Event Details. The following event details are significant to the modeling of this event analysis:
A tornado led to a dual-unit reactor trip and LOOP event.
Offsite power recovery to an emergency bus was possible five hours and three minutes after the LOOP occurred.
ANALYSIS RESULTS Conditional Core Damage Probabilities. The point estimate conditional core damage probabilities (CCDPs) for this event is 9.3x10-5 for Unit 1 and 7.2x10-5 for Unit 2.
The Accident Sequence Precursor Program acceptance threshold is a CCDP of 1x10-6 or the CCDP equivalent of an uncomplicated reactor trip with a non-recoverable loss of secondary plant systems (e.g., feed water and condensate), whichever is greater. This CCDP equivalent for Surry is 3x10-7.
Dominant Sequence. The dominant accident sequences are LOOPWR Sequence 02-06 (CCDP = 4.6x10-5) which contributes 50% of the total internal events CCDP for Unit 1 and LOOPWR Sequence 17-03-10 (CCDP = 2.2x10-5) which contributes 30% of the total internal events CCDP for Unit 2. Additional sequences that contribute greater than 1% of the total internal events CCDP are provided in Appendix A.
The dominant sequence is shown graphically in Figures B-1 and B-2 in Appendix B. The events and important component failures in LOOPWR Sequence 02-06 are:
Weather-related LOOP occurs, Reactor scram succeeds, Emergency power succeeds, AFW succeeds, Power-operated relief valves successfully close (if opened),
Rapid secondary depressurization succeeds, RCP seal cooling fails, RCP Seal 1 integrity is maintained, RCP Seal 2 integrity fails, Operators fail to restore offsite power within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, High pressure injection fails, The events and important component failures in LOOPWR Sequence 17-03-10 are:
Weather-related LOOP occurs, Reactor scram succeeds, Emergency power fails, AFW succeeds, Power-operated relief valves successfully close (if opened),
Rapid secondary depressurization succeeds, RCP Seal 1 integrity is maintained, RCP Seal 2 integrity is maintained, Operators fail to restore offsite power within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, Operators fail to recover an EDG within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />, Analysis Results. Appendix A provides tables that include the following:
Modified basic events and initiating event frequencies, including base and change case probabilities/frequencies.
Dominant sequences (including CCDPs).
Sequence logic for all dominant sequences.
Fault tree definitions.
Sequence cutsets.
Definitions and probabilities for key basic events.
MODELING ASSUMPTIONS Analysis Type. The Surry Unit 1 and Unit 2 SPAR models created in April 2012 were used for this event analysis. This event was modeled as a weather-related LOOP initiating event.
Analysis Rules. The ASP program uses Significance Determination Process results for degraded conditions when available. However, the ASP Program performs independent analysis for initiating events.
Unique Design Features. Surry, Units 1 and 2 have the following unique design features associated with its emergency electrical distribution system.
EDG 1 provides power to Emergency Bus 1H only.
EDG 2 provides power to Emergency Bus 2H only.
EDG 3 (swing diesel) provides power to Emergency Buses 1J and 2J. The swing EDG was aligned to Bus 1J during the event. EDG 3 is available for the unit of concern unless the dedicated diesel generator for the other unit is not available. In that case, the swing diesel will be aligned to the other unit.
The AAC Diesel Generator can be aligned to either Emergency Bus 1J or 2H given that the diesels that normally align to these buses have failed.
The diesel generators do not require cooling water.
Figure 1. Surry, Units 1 and 2 simplified diagram of emergency electrical distribution system.
Modeling Assumptions. The following modeling assumptions were determined to be vital to this event analysis:
This analysis models the April 16, 2011 dual-unit reactor trip at Surry Unit 1 and 2 as a LOOP initiating event.
Offsite power recovery to an emergency bus was possible five hours and three minutes after the LOOP occurred.
Basic Event Probability Changes. The following initiating event frequencies and basic event probabilities were modified for this event analysis:
Unit 1 The LOOP initiating event frequency (IE-LOOP) was set 1.0 to represent the operational event that occurred at Surry Unit 1 on April 16, 2011. All other initiating events frequencies were set to zero.
The non-recovery probability for basic events OEP-XHE-XL-NR01H (Operator Fails to Recover Offsite Power in 1 Hour), OEP-XHE-XL-NR02H (Operator Fails to Recover Offsite Power in 2 Hours), OEP-XHE-XL-NR03H (Operator Fails to Recover Offsite Power in 3 Hours), OEP-XHE-XL-NR04H (Operator Fails to Recover Offsite Power in 4 Hours) were set to TRUE because offsite power recovery to an emergency bus was not possible until five hours and three minutes after the LOOP occurred.
The default diesel generator mission times were changed to reflect the actual time offsite power was restored to the first vital bus (approximately 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> for Unit 1). Since the overall fail-to-run is made up of two separate factors, the mission times for these factors were set to the following: ZT-DGN-FR-E = 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> (base case value) and ZT-DGN-FR-L
= 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.
Unit 2 The LOOP initiating event frequency (IE-LOOP) was set 1.0 to represent the operational event that occurred at Surry Unit 2 on April 16, 2011. All other initiating events frequencies were set to zero.
The non-recovery probability for basic events OEP-XHE-XL-NR01H (Operator Fails to Recover Offsite Power in 1 Hour), OEP-XHE-XL-NR02H (Operator Fails to Recover Offsite Power in 2 Hours), OEP-XHE-XL-NR03H (Operator Fails to Recover Offsite Power in 3 Hours), OEP-XHE-XL-NR04H (Operator Fails to Recover Offsite Power in 4 Hours) were set to TRUE because offsite power recovery to an emergency bus was not possible until five hours and three minutes after the LOOP occurred.
The default diesel generator mission times were changed to reflect the actual time offsite power was restored to the first vital bus (approximately 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> for Unit 2). Since the overall fail-to-run is made up of two separate factors, the mission times for these factors were set to the following: ZT-DGN-FR-E = 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> (base case value) and ZT-DGN-FR-L
= 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
REFERENCES
- 1. Surry Power Station Unit 1, "LER 280/11-001-Reactor Trip on Both Units Due to Loss of Offsite Power dated June 14, 2011. (ML11178A032)
- 2. U.S. Nuclear Regulatory Commission, Surry Power Station NRC Integrated Inspection Report 05000280/2011003, dated July 28, 2011. (ML112092845)
LER 280/11-001 A-1 Appendix A: Analysis Results Unit 1 Summary of Conditional Event Changes Event Description Cond.
Value Nominal Value DUAL-UNIT-LOOP LOOP AFFECTING BOTH UNITS TRUE 5.82E-1 IE-LOOPWR LOSS OF OFFSITE POWER INITIATOR (WEATHER-RELATED) 1.00E+0 4.83E-3 OEP-XHE-XL-NR01HWR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 1 HOUR (WEATHER-RELATED)
TRUE 6.87E-1 OEP-XHE-XL-NR02HWR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 2 HOURS (WEATHER-RELATED)
TRUE 5.59E-1 OEP-XHE-XL-NR03HWR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 3 HOURS (WEATHER-RELATED)
TRUE 4.80E-1 OEP-XHE-XL-NR04HWR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 4 HOURS (WEATHER-RELATED)
TRUE 4.24E-1 ZT-DGN-FR-L DIESEL GENERATOR FAILS TO RUN 5.42E-3 2.47E-2 EPS-DGN-FR-DG1 DIESEL GENERATOR 1 FAILS TO RUN 9.17E-3 2.84E-2 EPS-DGN-FR-DG2 DIESEL GENERATOR 2 FAILS TO RUN 9.17E-3 2.84E-2 EPS-DGN-FR-DG3 DIESEL GENERATOR 3 FAILS TO RUN 9.17E-3 2.84E-2 EPS-DGN-FR-SBO SBO DIESEL GENERATOR FAILS TO RUN 1.09E-2 3.01E-2 Dominant Sequence Results Only items contributing at least 1.0% to the total CCDP are displayed.
Event Tree Sequence CCDP
% Contribution Description LOOPWR 02-06 4.62E-5 49.6%
/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD,
/BP1, BP2, OPR-02H, HPI-L LOOPWR 17-03-10 1.75E-5 18.7%
/RPS-L, EPS, /AFW-B, /PORV-B, /RSD, /BP1, /BP2, OPR-04H, DGR-04H, AFW-MAN, SG-DEP-LT1 LOOPWR 17-06 1.45E-5 15.6%
/RPS-L, EPS, /AFW-B, /PORV-B, /RSD, /BP1, BP2, OPR-04H, DGR-04H LOOPWR 17-03-04 3.46E-6 3.7%
/RPS-L, EPS, /AFW-B, /PORV-B, /RSD, /BP1, /BP2, OPR-04H, DGR-04H, /AFW-MAN, /CST-REFILL-LT1, SG-DEP-LT2, PWR-REC-24H LOOPWR 16 3.03E-6 3.2%
/RPS-L, /EPS, AFW-L, FAB-L LOOPWR 02-11 2.30E-6 2.5%
/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD, BP1, /BP2, OPR-02H, HPI-L LOOPWR 17-45 1.30E-6 1.4%
/RPS-L, EPS, AFW-B, OPR-01H, DGR-01H Total 9.33E-5 100.0%
Referenced Fault Trees Fault Tree Description AFW-B AUXILIARY FEEDWATER AFW-L AUXILIARY FEEDWATER AFW-MAN MANUAL CONTROL AFW BP1 RCP SEAL STAGE 1 INTEGRITY (BINDING/POPPING)
BP2 RCP SEAL STAGE 2 INTEGRITY (BINDING/POPPING)
DGR-01H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 1 HOUR
LER 280/11-001 A-2 Fault Tree Description DGR-04H DIESEL GENERATOR RECOVERY (IN 4 HR)
EPS Emergency Power FAB-L FEED AND BLEED HPI-L HIGH PRESSURE INJECTION LOSC-L SURRY 1 & 2 LOSS OF ALL RCP SEAL COOLING USING LOOP-FTF OPR-01H OFFSITE POWER RECOVERY IN 1 HR OPR-02H OFFSITE POWER RECOVERY IN 2 HRS OPR-04H OFFSITE POWER RECOVERY (IN 4 HR)
PWR-REC-24H LATE POWER RECOVERY (24 HR)
SG-DEP-LT1 DEPRESSURIZE SGs (DEPENDENT)
SG-DEP-LT2 DEPRESSURIZE SGs (DEPENDENT)
Cutset Report - LOOPWR 02-06 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 4.62E-5 100 Displaying 4315 of 4315 Cutsets.
1 2.87E-6 6.21 IE-LOOPWR,EPS-DGN-TM-DG1,RCS-MDP-LK-BP2,SWS-101A-OPEN,SWS-XHE-XM-ISOL 2
2.76E-6 5.98 IE-LOOPWR,EPS-DGN-TM-DG1,MCW-MOV-OO-106D,RCS-MDP-LK-BP2 3
2.76E-6 5.98 IE-LOOPWR,EPS-DGN-TM-DG1,MCW-MOV-OO-100C,RCS-MDP-LK-BP2 4
2.76E-6 5.98 IE-LOOPWR,EPS-DGN-TM-DG1,MCW-MOV-OO-106B,RCS-MDP-LK-BP2 5
2.76E-6 5.98 IE-LOOPWR,EPS-DGN-TM-DG1,MCW-MOV-OO-100A,RCS-MDP-LK-BP2 6
2.58E-6 5.57 IE-LOOPWR,DCP-BAT-LP-1BATA4HR,EPS-DGN-TM-DG1,MCW-LGC-FC-LOGICB,RCS-MDP-LK-BP2 7
1.83E-6 3.97 IE-LOOPWR,EPS-DGN-FR-DG1,RCS-MDP-LK-BP2,SWS-101A-OPEN,SWS-XHE-XM-ISOL 8
1.77E-6 3.82 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-MOV-OO-106D,RCS-MDP-LK-BP2 9
1.77E-6 3.82 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-MOV-OO-100C,RCS-MDP-LK-BP2 10 1.77E-6 3.82 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-MOV-OO-106B,RCS-MDP-LK-BP2 11 1.77E-6 3.82 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-MOV-OO-100A,RCS-MDP-LK-BP2 12 1.65E-6 3.56 IE-LOOPWR,DCP-BAT-LP-1BATA4HR,EPS-DGN-FR-DG1,MCW-LGC-FC-LOGICB,RCS-MDP-LK-BP2 13 1.44E-6 3.1 IE-LOOPWR,EPS-DGN-TM-DG1,MCW-XHE-XM-LVL,RCS-MDP-LK-BP2 14 9.17E-7 1.98 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-XHE-XM-LVL,RCS-MDP-LK-BP2 15 5.78E-7 1.25 IE-LOOPWR,EPS-DGN-FS-DG1,RCS-MDP-LK-BP2,SWS-101A-OPEN,SWS-XHE-XM-ISOL 16 5.57E-7 1.2 IE-LOOPWR,EPS-DGN-FS-DG1,MCW-MOV-OO-106D,RCS-MDP-LK-BP2 17 5.57E-7 1.2 IE-LOOPWR,EPS-DGN-FS-DG1,MCW-MOV-OO-100C,RCS-MDP-LK-BP2 18 5.57E-7 1.2 IE-LOOPWR,EPS-DGN-FS-DG1,MCW-MOV-OO-106B,RCS-MDP-LK-BP2 19 5.57E-7 1.2 IE-LOOPWR,EPS-DGN-FS-DG1,MCW-MOV-OO-100A,RCS-MDP-LK-BP2 20 5.19E-7 1.12 IE-LOOPWR,DCP-BAT-LP-1BATA4HR,EPS-DGN-FS-DG1,MCW-LGC-FC-LOGICB,RCS-MDP-LK-BP2
LER 280/11-001 A-3 Cutset Report - LOOPWR 17-03-10 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 1.75E-5 100 Displaying 754 of 754 Cutsets.
1 6.83E-6 39.1 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 2
1.91E-6 10.9 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-CF-FSALL,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 3
4.41E-7 2.53 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG1,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO1J,/RCS-MDP-LK-BP2 4
4.41E-7 2.53 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-FR-DG1,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO1J,/RCS-MDP-LK-BP2 5
3.17E-7 1.81 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG1,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 6
3.17E-7 1.81 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-FR-DG1,EPS-DGN-TM-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 7
2.82E-7 1.62 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-FR-DG1,EPS-DGN-FR-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO1J,/RCS-MDP-LK-BP2 8
2.41E-7 1.38 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-FR-DG3,EPS-DGN-FR-SBO,EPS-DGN-TM-DG1,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 9
2.41E-7 1.38 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-FR-DG1,EPS-DGN-FR-SBO,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 10 2.02E-7 1.16 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-1BATA4HR,DCP-BAT-LP-1BATB4HR,EPS-DGN-FR-DG1,EPS-DGN-FR-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 Cutset Report - LOOPWR 17-06 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 1.45E-5 100 Displaying 733 of 733 Cutsets.
1 5.69E-6 39.1 IE-LOOPWR,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 2
1.59E-6 10.9 IE-LOOPWR,EPS-DGN-CF-FSALL,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 3
3.68E-7 2.53 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO1J,RCS-MDP-LK-BP2 4
3.68E-7 2.53 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG1,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO1J,RCS-MDP-LK-BP2 5
2.64E-7 1.81 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-TM-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 6
2.64E-7 1.81 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG1,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 7
2.35E-7 1.62 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-FR-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO1J,RCS-MDP-LK-BP2 8
2.01E-7 1.38 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-FR-SBO,EPS-DGN-TM-DG1,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 9
2.01E-7 1.38 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-FR-SBO,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2
LER 280/11-001 A-4 CCDP Total%
Cutset 10 1.69E-7 1.16 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-FR-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 Cutset Report - LOOPWR 17-03-04 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 3.46E-6 100 Displaying 487 of 487 Cutsets.
1 1.36E-6 39.2 IE-LOOPWR,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 2
3.79E-7 10.9 IE-LOOPWR,EPS-DGN-CF-FSALL,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 3
8.75E-8 2.53 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG1,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-SBO1J,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 4
8.75E-8 2.53 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-SBO1J,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 5
6.28E-8 1.81 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG1,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 6
6.28E-8 1.81 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-TM-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 7
5.59E-8 1.62 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-FR-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-SBO1J,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 8
4.78E-8 1.38 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-FR-SBO,EPS-DGN-TM-DG1,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 9
4.78E-8 1.38 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-FR-SBO,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 10 4.01E-8 1.16 IE-LOOPWR,EPS-DGN-FR-DG1,EPS-DGN-FR-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 Cutset Report - LOOPWR 16 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 3.03E-6 100 Displaying 4208 of 4208 Cutsets.
1 9.22E-7 30.4 IE-LOOPWR,AFW-XHE-XM-XTIE,CDS-XVM-CC-CN150,HPI-XHE-XM-FB 2
4.80E-7 15.9 IE-LOOPWR,AFW-SYS-LK-SGCKVS,AFW-XHE-XM-XTIE,HPI-XHE-XM-FB 3
4.31E-7 14.2 IE-LOOPWR,AFW-PMP-CF-ALL,HPI-XHE-XM-FB 4
9.92E-8 3.27 IE-LOOPWR,AFW-XHE-XM-XTIE,CDS-XVM-CC-CN150,DCP-BAT-LP-1BATA4HR,EPS-DGN-TM-DG1,PPR-MOV-FC-RC1535 5
6.34E-8 2.09 IE-LOOPWR,AFW-XHE-XM-XTIE,CDS-XVM-CC-CN150,DCP-BAT-LP-1BATA4HR,EPS-DGN-FR-DG1,PPR-MOV-FC-RC1535 6
5.19E-8 1.71 IE-LOOPWR,AFW-MDP-TM-1P3B,AFW-TDP-FR-1P2,AFW-XHE-XM-XTIE,DCP-BAT-LP-1BATA4HR,EPS-DGN-FR-DG1,PPR-MOV-FC-RC1535 7
5.17E-8 1.71 IE-LOOPWR,AFW-SYS-LK-SGCKVS,AFW-XHE-XM-XTIE,DCP-BAT-LP-1BATA4HR,EPS-DGN-TM-DG1,PPR-MOV-FC-RC1535 8
5.14E-8 1.7 IE-LOOPWR,AFW-XHE-XM-XTIE,CDS-CKV-CC-CN151,HPI-XHE-XM-FB
LER 280/11-001 A-5 CCDP Total%
Cutset 9
4.64E-8 1.53 IE-LOOPWR,AFW-PMP-CF-ALL,DCP-BAT-LP-1BATA4HR,EPS-DGN-TM-DG1,PPR-MOV-FC-RC1535 10 3.30E-8 1.09 IE-LOOPWR,AFW-SYS-LK-SGCKVS,AFW-XHE-XM-XTIE,DCP-BAT-LP-1BATA4HR,EPS-DGN-FR-DG1,PPR-MOV-FC-RC1535 11 3.25E-8 1.07 IE-LOOPWR,AFW-MOV-CO-260A,HPI-XHE-XM-FB 12 3.25E-8 1.07 IE-LOOPWR,AFW-MOV-CO-260B,HPI-XHE-XM-FB Cutset Report - LOOPWR 02-11 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 2.30E-6 100 Displaying 1440 of 1440 Cutsets.
1 1.44E-7 6.23 IE-LOOPWR,EPS-DGN-TM-DG1,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2,SWS-101A-OPEN,SWS-XHE-XM-ISOL 2
1.38E-7 6
IE-LOOPWR,EPS-DGN-TM-DG1,MCW-MOV-OO-106B,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 3
1.38E-7 6
IE-LOOPWR,EPS-DGN-TM-DG1,MCW-MOV-OO-100A,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 4
1.38E-7 6
IE-LOOPWR,EPS-DGN-TM-DG1,MCW-MOV-OO-100C,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 5
1.38E-7 6
IE-LOOPWR,EPS-DGN-TM-DG1,MCW-MOV-OO-106D,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 6
1.29E-7 5.59 IE-LOOPWR,DCP-BAT-LP-1BATA4HR,EPS-DGN-TM-DG1,MCW-LGC-FC-LOGICB,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 7
9.17E-8 3.98 IE-LOOPWR,EPS-DGN-FR-DG1,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2,SWS-101A-OPEN,SWS-XHE-XM-ISOL 8
8.83E-8 3.83 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-MOV-OO-106B,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 9
8.83E-8 3.83 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-MOV-OO-100A,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 10 8.83E-8 3.83 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-MOV-OO-100C,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 11 8.83E-8 3.83 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-MOV-OO-106D,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 12 8.24E-8 3.57 IE-LOOPWR,DCP-BAT-LP-1BATA4HR,EPS-DGN-FR-DG1,MCW-LGC-FC-LOGICB,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 13 7.18E-8 3.11 IE-LOOPWR,EPS-DGN-TM-DG1,MCW-XHE-XM-LVL,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 14 4.59E-8 1.99 IE-LOOPWR,EPS-DGN-FR-DG1,MCW-XHE-XM-LVL,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 15 2.89E-8 1.25 IE-LOOPWR,EPS-DGN-FS-DG1,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2,SWS-101A-OPEN,SWS-XHE-XM-ISOL 16 2.78E-8 1.21 IE-LOOPWR,EPS-DGN-FS-DG1,MCW-MOV-OO-106B,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 17 2.78E-8 1.21 IE-LOOPWR,EPS-DGN-FS-DG1,MCW-MOV-OO-100A,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 18 2.78E-8 1.21 IE-LOOPWR,EPS-DGN-FS-DG1,MCW-MOV-OO-100C,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 19 2.78E-8 1.21 IE-LOOPWR,EPS-DGN-FS-DG1,MCW-MOV-OO-106D,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2 20 2.60E-8 1.13 IE-LOOPWR,DCP-BAT-LP-1BATA4HR,EPS-DGN-FS-DG1,MCW-LGC-FC-LOGICB,RCS-MDP-LK-BP1,/RCS-MDP-LK-BP2
LER 280/11-001 A-6 Cutset Report - LOOPWR 17-45 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 1.30E-6 100 Displaying 2441 of 2441 Cutsets.
1 1.68E-7 13 IE-LOOPWR,AFW-TDP-FR-1P2,AFW-XHE-XM-XTIE,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR01H 2
5.54E-8 4.27 IE-LOOPWR,AFW-TDP-FR-1P2,AFW-TDP-FR-2P2,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR01H 3
4.71E-8 3.63 IE-LOOPWR,AFW-TDP-FR-1P2,AFW-XHE-XM-XTIE,EPS-DGN-CF-FSALL,EPS-XHE-XL-NR01H 4
3.25E-8 2.5 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-FR-1P2,EPS-DGN-FR-DG2,EPS-DGN-TM-DG1,EPS-DGN-TM-SBO,EPS-XHE-XL-NR01H 5
3.25E-8 2.5 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-FR-1P2,EPS-DGN-FR-DG1,EPS-DGN-TM-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR01H 6
2.81E-8 2.16 IE-LOOPWR,AFW-TDP-FR-1P2,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR01H,EPS-XHE-XM-SBO2H 7
2.77E-8 2.13 IE-LOOPWR,AFW-TDP-FS-1P2,AFW-XHE-XM-XTIE,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR01H 8
2.47E-8 1.91 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-FR-1P2,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-DGN-TM-DG1,EPS-XHE-XL-NR01H 9
2.47E-8 1.91 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-FR-1P2,EPS-DGN-FR-DG1,EPS-DGN-FR-SBO,EPS-DGN-TM-DG2,EPS-XHE-XL-NR01H 10 2.30E-8 1.77 IE-LOOPWR,AFW-TDP-TM-1P2,AFW-XHE-XM-XTIE,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR01H 11 2.08E-8 1.6 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-FR-1P2,EPS-DGN-FR-DG1,EPS-DGN-FR-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR01H 12 2.01E-8 1.55 IE-LOOPWR,AFW-TDP-FR-1P2,EPS-DGN-CF-FRALL,EPS-DGN-TM-SBO,EPS-XHE-XL-NR01H 13 1.58E-8 1.22 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-FR-1P2,EPS-DGN-FR-DG1,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-XHE-XL-NR01H 14 1.55E-8 1.19 IE-LOOPWR,AFW-TDP-FR-1P2,AFW-TDP-FR-2P2,EPS-DGN-CF-FSALL,EPS-XHE-XL-NR01H 15 1.53E-8 1.18 IE-LOOPWR,AFW-TDP-FR-1P2,EPS-DGN-CF-FRALL,EPS-DGN-FR-SBO,EPS-XHE-XL-NR01H Referenced Events Event Description Probability ACP-DG3-ALIGN-AWAY DG3 ALIGNED TO OPPOSITE UNIT 5.00E-1 AFW-MDP-TM-1P3B AFW MDP 1-FW-P-3B UNAVAILABLE DUE TO T&M 3.98E-3 AFW-MOV-CO-260A AFW CROSS-TIE 2-FW-MOV-260A DIVERTS FLOW 8.13E-7 AFW-MOV-CO-260B AFW CROSS-TIE 2-FW-MOV-260B DIVERTS FLOW 8.13E-7 AFW-PMP-CF-ALL COMMON CAUSE FAILURE OF AFW PUMPS( BOTH UNITS) 1.08E-5 AFW-SYS-LK-SGCKVS STEAM LEAKAGE THRU CKVS 27.58 & 89 (PSA )
1.00E-4 AFW-TDP-FR-1P2 AFW TURBINE DRIVEN PUMP 1-FW-P-2 FAILS TO RUN 3.95E-2 AFW-TDP-FR-2P2 UNIT 2 AFW TD PUMP 2-FW-P-2 FAILS TO RUN 3.95E-2 AFW-TDP-FS-1P2 AFW TURBINE DRIVEN PUMP 1-FW-P-2 FAILS TO START 6.49E-3 AFW-TDP-TM-1P2 AFW TDP 1-FW-P-2 UNAVAILABLE DUE TO T&M 5.39E-3 AFW-XHE-XM-CNTRL OPERATOR FAILS TO CONTROL AFW TDP 3.00E-1 AFW-XHE-XM-XTIE OPERATOR FAILS TO INITIATE AFW CROSSCONNECT 1.20E-1 CDS-CKV-CC-CN151 ECST M/U CHK VALVE 1-CN-151 FAILS CLOSED 1.07E-5
LER 280/11-001 A-7 Event Description Probability CDS-XVM-CC-CN150 ECST M/U VALVE 1-CN-150 FAILS CLOSED 1.92E-4 DCP-BAT-LP-1BATA4HR BATTERY 1A 1-EPD-B-1A FAILURE AT 4 HOURS 1.00E+0 DCP-BAT-LP-1BATB4HR BATTERY 1B 1-EPD-B-1B FAILURE AT 4 HOURS 1.00E+0 EPS-DGN-CF-FRALL COMMON CAUSE FAILURE OF DIESEL GENERATORS TO RUN 4.08E-5 EPS-DGN-CF-FSALL COMMON CAUSE FAILURE OF DIESEL GENERATORS TO START 1.14E-5 EPS-DGN-FR-DG1 DIESEL GENERATOR 1 FAILS TO RUN 9.17E-3 EPS-DGN-FR-DG2 DIESEL GENERATOR 2 FAILS TO RUN 9.17E-3 EPS-DGN-FR-DG3 DIESEL GENERATOR 3 FAILS TO RUN 9.17E-3 EPS-DGN-FR-SBO SBO DIESEL GENERATOR FAILS TO RUN 1.09E-2 EPS-DGN-FS-DG1 DIESEL GENERATOR 1 FAILS TO START 2.89E-3 EPS-DGN-TM-DG1 DIESEL GENERATOR 1 UNAVAILABLE DUE TO T&M 1.43E-2 EPS-DGN-TM-DG2 DIESEL GENERATOR 2 UNAVAILABLE DUE TO T&M 1.43E-2 EPS-DGN-TM-DG3 DIESEL GENERATOR 3 UNAVAILABLE DUE TO T&M 1.43E-2 EPS-DGN-TM-SBO SBO DIESEL GENERATOR UNAVAILABLE DUE TO T&M 1.43E-2 EPS-XHE-XL-NR01H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 1 HOUR 8.71E-1 EPS-XHE-XL-NR04H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 4 HOURS 6.98E-1 EPS-XHE-XL-NR24H4 OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 24 HOURS (GIVEN FAILURE AT 4) 4.16E-1 EPS-XHE-XM-SBO1J OPERATOR FAILS TO ALIGN SBO DIESEL TO BUS 1J 2.00E-2 EPS-XHE-XM-SBO2H OPERATOR FAILS TO ALIGN SBO DIESEL TO BUS 2H 2.00E-2 HPI-XHE-XM-FB OPERATOR FAILS TO INITIATE FEED AND BLEED COOLING 4.00E-2 IE-LOOPWR LOSS OF OFFSITE POWER INITIATOR (WEATHER-RELATED) 1.00E+0 MCW-LGC-FC-LOGICB LOGIC TRAIN B NON-ESSENTL SW ISOLLOSS OF FUNCTION (PSA) 8.98E-4 MCW-MOV-OO-100A CONDENSER OUTLET 1-CW-MOV-100A FAILS OPEN 9.63E-4 MCW-MOV-OO-100C CONDENSER OUTLET 1-CW-MOV-100CD FAILS OPEN 9.63E-4 MCW-MOV-OO-106B CONDENSER INLET MOV1-CW-MOV-106B FAILS OPEN 9.63E-4 MCW-MOV-OO-106D CONDENSER INLET MOV1-CW-MOV-106D FAILS OPEN 9.63E-4 MCW-XHE-XM-LVL LEVEL INSTRUMENTS 1-CW-LS-102 / 103 CCF MISCALIBRATED (PSA) 5.00E-4 OEP-XHE-XL-NR24H4WR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 24 HOURS (GIVEN FAILURE AT 4, WEATHER) 1.43E-1 PPR-MOV-FC-RC1535 BLOCK VALVE 1535 CLOSED DUE TO PORV LEAKING 3.00E-1 RCS-MDP-LK-BP1 RCP SEAL STAGE 1 INTEGRITY (BINDING/POPPING OPEN)
FAILS 1.25E-2 RCS-MDP-LK-BP2 RCP SEAL STAGE 2 INTEGRITY (BINDING/POPPING OPEN)
FAILS 2.00E-1 SWS-101A-OPEN PROBABILITY OF 1-SW-MOV-101A ALIGNED OPEN 5.00E-1 SWS-XHE-XM-ISOL FAILURE TO VERIFY/ISOLATE SWS/CW INLET MOVS (AP-12, STEP 11) 2.00E-3
LER 280/11-001 A-8 Unit 2 Summary of Conditional Event Changes Event Description Cond.
Value Nominal Value DUAL-UNIT-LOOP LOOP AFFECTING BOTH UNITS TRUE 5.82E-1 IE-LOOPWR LOSS OF OFFSITE POWER INITIATOR (WEATHER-RELATED) 1.00E+0 4.83E-3 OEP-XHE-XL-NR01HWR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 1 HOUR (WEATHER-RELATED)
TRUE 6.87E-1 OEP-XHE-XL-NR02HWR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 2 HOURS (WEATHER-RELATED)
TRUE 5.59E-1 OEP-XHE-XL-NR03HWR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 3 HOURS (WEATHER-RELATED)
TRUE 4.80E-1 OEP-XHE-XL-NR04HWR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 4 HOURS (WEATHER-RELATED)
TRUE 4.24E-1 ZT-DGN-FR-L DIESEL GENERATOR FAILS TO RUN 6.50E-3 2.47E-2 EPS-DGN-FR-DG1 DIESEL GENERATOR 1 FAILS TO RUN 1.02E-2 2.84E-2 EPS-DGN-FR-DG2 DIESEL GENERATOR 2 FAILS TO RUN 1.02E-2 2.84E-2 EPS-DGN-FR-DG3 DIESEL GENERATOR 3 FAILS TO RUN 1.02E-2 2.84E-2 EPS-DGN-FR-SBO SBO DIESEL GENERATOR FAILS TO RUN 1.20E-2 3.01E-2 Dominant Sequence Results Only items contributing at least 1.0% to the total CCDP are displayed.
Event Tree Sequence CCDP
% Contribution Description LOOPWR 17-03-10 2.15E-5 30.0%
/RPS-L, EPS, /AFW-B, /PORV-B, /RSD, /BP1,
/BP2, OPR-04H, DGR-04H, AFW-MAN, SG-DEP-LT1 LOOPWR 17-06 1.79E-5 25.0%
/RPS-L, EPS, /AFW-B, /PORV-B, /RSD, /BP1, BP2, OPR-04H, DGR-04H LOOPWR 02-06 1.31E-5 18.4%
/RPS-L, /EPS, /AFW-L, /PORV-L, LOSC-L, /RSD,
/BP1, BP2, OPR-02H, HPI-L LOOPWR 16 6.03E-6 8.4%
/RPS-L, /EPS, AFW-L, FAB-L LOOPWR 17-45 4.85E-6 6.8%
/RPS-L, EPS, AFW-B, OPR-01H, DGR-01H LOOPWR 17-03-04 4.26E-6 6.0%
/RPS-L, EPS, /AFW-B, /PORV-B, /RSD, /BP1,
/BP2, OPR-04H, DGR-04H, /AFW-MAN, /CST-REFILL-LT1, SG-DEP-LT2, PWR-REC-24H Total 7.15E-5 100.0%
Referenced Fault Trees Fault Tree Description AFW-B AUXILIARY FEEDWATER AFW-L AUXILIARY FEEDWATER AFW-MAN MANUAL CONTROL AFW BP2 RCP SEAL STAGE 2 INTEGRITY (BINDING/POPPING)
DGR-01H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 1 HOUR DGR-04H DIESEL GENERATOR RECOVERY (IN 4 HR)
EPS EMERGENCY POWER IS UNAVAILABLE FAB-L FEED AND BLEED HPI-L HIGH PRESSURE INJECTION
LER 280/11-001 A-9 Fault Tree Description LOSC-L SURRY 2 LOSS OF ALL RCP SEAL COOLING USING LOOP-FTF OPR-01H OFFSITE POWER RECOVERY IN 1 HR OPR-02H OFFSITE POWER RECOVERY IN 2 HRS OPR-04H OFFSITE POWER RECOVERY (IN 4 HR)
PWR-REC-24H LATE POWER RECOVERY (24 HR)
SG-DEP-LT1 DEPRESSURIZE SGs (DEPENDENT)
SG-DEP-LT2 DEPRESSURIZE SGs (DEPENDENT)
Cutset Report - LOOPWR 17-03-10 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 2.15E-5 100 Displaying 931 of 931 Cutsets.
1 3.83E-6 17.8 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 2
9.62E-7 4.48 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,EPS-XHE-XM-SBO2H,/RCS-MDP-LK-BP2 3
9.55E-7 4.45 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-CF-FSALL,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 4
6.90E-7 3.22 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-TM-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,/RCS-MDP-LK-BP2 5
6.87E-7 3.2 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,EPS-XHE-XM-SBO2H,/RCS-MDP-LK-BP2 6
5.77E-7 2.69 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-SBO,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,/RCS-MDP-LK-BP2 7
4.93E-7 2.3 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG2,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO2H,/RCS-MDP-LK-BP2 8
4.93E-7 2.3 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO2H,/RCS-MDP-LK-BP2 9
4.93E-7 2.3 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,/RCS-MDP-LK-BP2 10 4.12E-7 1.92 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,/RCS-MDP-LK-BP2 11 3.54E-7 1.65 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG2,EPS-DGN-TM-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 12 3.54E-7 1.65 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 13 3.52E-7 1.64 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG2,EPS-DGN-FR-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO2H,/RCS-MDP-LK-BP2
LER 280/11-001 A-10 CCDP Total%
Cutset 14 2.96E-7 1.38 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG3,EPS-DGN-FR-SBO,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 15 2.96E-7 1.38 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 16 2.53E-7 1.18 IE-LOOPWR,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATA4HR,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG2,EPS-DGN-FR-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,/RCS-MDP-LK-BP2 Cutset Report - LOOPWR 17-06 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 1.79E-5 100 Displaying 911 of 911 Cutsets.
1 3.19E-6 17.8 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 2
8.02E-7 4.48 IE-LOOPWR,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,EPS-XHE-XM-SBO2H,RCS-MDP-LK-BP2 3
7.96E-7 4.45 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,EPS-DGN-CF-FSALL,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 4
5.75E-7 3.22 IE-LOOPWR,EPS-DGN-TM-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,RCS-MDP-LK-BP2 5
5.73E-7 3.2 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,EPS-XHE-XM-SBO2H,RCS-MDP-LK-BP2 6
4.81E-7 2.69 IE-LOOPWR,EPS-DGN-FR-SBO,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,RCS-MDP-LK-BP2 7
4.11E-7 2.3 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO2H,RCS-MDP-LK-BP2 8
4.11E-7 2.3 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO2H,RCS-MDP-LK-BP2 9
4.11E-7 2.3 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,RCS-MDP-LK-BP2 10 3.43E-7 1.92 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XM-DG32J,RCS-MDP-LK-BP2 11 2.95E-7 1.65 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 12 2.95E-7 1.65 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-TM-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 13 2.93E-7 1.64 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-FR-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XM-SBO2H,RCS-MDP-LK-BP2 14 2.46E-7 1.38 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-FR-SBO,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 15 2.46E-7 1.38 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2 16 2.10E-7 1.18 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-FR-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,RCS-MDP-LK-BP2
LER 280/11-001 A-11 Cutset Report - LOOPWR 02-06 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 1.31E-5 100 Displaying 3769 of 3769 Cutsets.
1 1.68E-6 12.8 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-XHE-XM-DG32J,IAS-MDC-FR-1C1,RCS-MDP-LK-BP2 2
1.20E-6 9.18 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-TM-DG3,IAS-MDC-FR-1C1,RCS-MDP-LK-BP2 3
8.60E-7 6.55 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-DG3,IAS-MDC-FR-1C1,RCS-MDP-LK-BP2 4
4.87E-7 3.71 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-XHE-XM-DG32J,IAS-MDC-FS-1C1,RCS-MDP-LK-BP2 5
4.09E-7 3.12 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-TM-DG3,EPS-XHE-XM-SBO1J,RCS-MDP-LK-BP2 6
3.49E-7 2.66 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-TM-DG3,IAS-MDC-FS-1C1,RCS-MDP-LK-BP2 7
3.42E-7 2.61 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-XHE-XM-DG32J,IAS-MDC-TM-1C1,RCS-MDP-LK-BP2 8
3.21E-7 2.45 IE-LOOPWR,CPC-MDP-FS-SWP10A,EPS-XHE-XM-DG32J,IAS-MDC-FR-1C1,RCS-MDP-LK-BP2 9
2.93E-7 2.24 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-TM-DG3,EPS-DGN-TM-SBO,RCS-MDP-LK-BP2 10 2.92E-7 2.23 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-DG3,EPS-XHE-XM-SBO1J,RCS-MDP-LK-BP2 11 2.50E-7 1.9 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-DG3,IAS-MDC-FS-1C1,RCS-MDP-LK-BP2 12 2.45E-7 1.87 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-TM-DG3,IAS-MDC-TM-1C1,RCS-MDP-LK-BP2 13 2.45E-7 1.87 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-SBO,EPS-DGN-TM-DG3,RCS-MDP-LK-BP2 14 2.43E-7 1.85 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FS-DG3,IAS-MDC-FR-1C1,RCS-MDP-LK-BP2 15 2.30E-7 1.75 IE-LOOPWR,CPC-MDP-FS-SWP10A,EPS-DGN-TM-DG3,IAS-MDC-FR-1C1,RCS-MDP-LK-BP2 16 2.10E-7 1.6 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-DG3,EPS-DGN-TM-SBO,RCS-MDP-LK-BP2 17 2.10E-7 1.6 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-DG3,EPS-DGN-TM-DG2,RCS-MDP-LK-BP2 18 2.10E-7 1.6 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-DG2,EPS-DGN-TM-DG3,RCS-MDP-LK-BP2 19 2.01E-7 1.53 IE-LOOPWR,ACP-CRB-OO-25J3,CPC-MDP-TM-SWP10A,IAS-MDC-FR-1C1,RCS-MDP-LK-BP2 20 1.75E-7 1.34 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-DG3,IAS-MDC-TM-1C1,RCS-MDP-LK-BP2 21 1.75E-7 1.33 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-DG3,EPS-DGN-FR-SBO,RCS-MDP-LK-BP2 22 1.64E-7 1.25 IE-LOOPWR,CPC-MDP-FS-SWP10A,EPS-DGN-FR-DG3,IAS-MDC-FR-1C1,RCS-MDP-LK-BP2 23 1.50E-7 1.14 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-DGN-FR-DG2,EPS-DGN-FR-DG3,RCS-MDP-LK-BP2 24 1.48E-7 1.13 IE-LOOPWR,CPC-MDP-TM-SWP10A,EPS-SEQ-FO-DG3,IAS-MDC-FR-1C1,RCS-MDP-LK-BP2
LER 280/11-001 A-12 Cutset Report - LOOPWR 16 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 6.03E-6 100 Displaying 6814 of 6814 Cutsets.
1 9.22E-7 15.3 IE-LOOPWR,AFW-XHE-XM-XTIE,CDS-XVM-CC-CN150,HPI-XHE-XM-FB 2
4.80E-7 7.96 IE-LOOPWR,AFW-SYS-LK-SGCKVS,AFW-XHE-XM-XTIE,HPI-XHE-XM-FB 3
4.31E-7 7.15 IE-LOOPWR,AFW-PMP-CF-ALL,HPI-XHE-XM-FB 4
1.38E-7 2.29 IE-LOOPWR,AFW-XHE-XM-XTIE,CDS-XVM-CC-CN150,DCP-BAT-LP-2BATB4HR,EPS-XHE-XM-DG32J,PPR-MOV-FC-RC1536 5
1.13E-7 1.88 IE-LOOPWR,AFW-MDP-TM-2P3A,AFW-TDP-FR-2P2,AFW-XHE-XM-XTIE,DCP-BAT-LP-2BATB4HR,EPS-XHE-XM-DG32J,PPR-MOV-FC-RC1536 6
1.03E-7 1.7 IE-LOOPWR,AFW-MDP-TM-2P3A,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATB4HR,EPS-DGN-TM-DG3,EPS-XHE-XM-SBO1J,PPR-MOV-FC-RC1536 7
9.92E-8 1.65 IE-LOOPWR,AFW-XHE-XM-XTIE,CDS-XVM-CC-CN150,DCP-BAT-LP-2BATB4HR,EPS-DGN-TM-DG3,PPR-MOV-FC-RC1536 8
8.11E-8 1.35 IE-LOOPWR,AFW-MDP-TM-2P3A,AFW-TDP-FR-2P2,AFW-XHE-XM-XTIE,DCP-BAT-LP-2BATB4HR,EPS-DGN-TM-DG3,PPR-MOV-FC-RC1536 9
7.37E-8 1.22 IE-LOOPWR,AFW-MDP-TM-2P3A,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATB4HR,EPS-DGN-TM-DG3,EPS-DGN-TM-SBO,PPR-MOV-FC-RC1536 10 7.33E-8 1.22 IE-LOOPWR,AFW-MDP-TM-2P3A,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG3,EPS-XHE-XM-SBO1J,PPR-MOV-FC-RC1536 11 7.20E-8 1.19 IE-LOOPWR,AFW-SYS-LK-SGCKVS,AFW-XHE-XM-XTIE,DCP-BAT-LP-2BATB4HR,EPS-XHE-XM-DG32J,PPR-MOV-FC-RC1536 12 7.08E-8 1.18 IE-LOOPWR,AFW-XHE-XM-XTIE,CDS-XVM-CC-CN150,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-DG3,PPR-MOV-FC-RC1536 13 6.46E-8 1.07 IE-LOOPWR,AFW-PMP-CF-ALL,DCP-BAT-LP-2BATB4HR,EPS-XHE-XM-DG32J,PPR-MOV-FC-RC1536 14 6.16E-8 1.02 IE-LOOPWR,AFW-MDP-TM-2P3A,AFW-XHE-XM-CNTRL,DCP-BAT-LP-2BATB4HR,EPS-DGN-FR-SBO,EPS-DGN-TM-DG3,PPR-MOV-FC-RC1536 Cutset Report - LOOPWR 17-45 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 4.85E-6 100 Displaying 1740 of 1740 Cutsets.
1 7.86E-7 16.2 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-FR-2P2,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR01H 2
1.96E-7 4.04 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-FR-2P2,EPS-DGN-CF-FSALL,EPS-XHE-XL-NR01H 3
1.42E-7 2.92 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-TM-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR01H,EPS-XHE-XM-DG32J 4
1.29E-7 2.66 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-FS-2P2,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR01H 5
1.18E-7 2.44 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-SBO,EPS-DGN-TM-DG2,EPS-XHE-XL-NR01H,EPS-XHE-XM-DG32J 6
1.07E-7 2.21 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,AFW-TDP-TM-2P2,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR01H 7
1.01E-7 2.09 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG3,EPS-DGN-TM-DG2,EPS-XHE-XL-NR01H,EPS-XHE-XM-SBO2H 8
1.01E-7 2.09 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG2,EPS-DGN-TM-DG3,EPS-XHE-XL-NR01H,EPS-XHE-XM-SBO2H 9
1.01E-7 2.09 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR01H,EPS-XHE-XM-DG32J
LER 280/11-001 A-13 CCDP Total%
Cutset 10 8.46E-8 1.74 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-XHE-XL-NR01H,EPS-XHE-XM-DG32J 11 7.26E-8 1.5 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG3,EPS-DGN-TM-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR01H 12 7.26E-8 1.5 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG2,EPS-DGN-TM-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR01H 13 7.23E-8 1.49 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG2,EPS-DGN-FR-DG3,EPS-XHE-XL-NR01H,EPS-XHE-XM-SBO2H 14 6.07E-8 1.25 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-DGN-TM-DG3,EPS-XHE-XL-NR01H 15 6.07E-8 1.25 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG3,EPS-DGN-FR-SBO,EPS-DGN-TM-DG2,EPS-XHE-XL-NR01H 16 5.19E-8 1.07 IE-LOOPWR,AFW-TDP-FR-2P2,EPS-DGN-FR-DG2,EPS-DGN-FR-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR01H Cutset Report - LOOPWR 17-03-04 Only items contributing at least 1% to the total are displayed.
CCDP Total%
Cutset 4.25E-6 100 Displaying 603 of 603 Cutsets.
1 7.59E-7 17.9 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,EPS-DGN-CF-FRALL,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 2
1.91E-7 4.49 IE-LOOPWR,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-DG32J,EPS-XHE-XM-SBO2H,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 3
1.89E-7 4.45 IE-LOOPWR,ACP-DG3-ALIGN-AWAY,EPS-DGN-CF-FSALL,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 4
1.37E-7 3.22 IE-LOOPWR,EPS-DGN-TM-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-DG32J,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 5
1.36E-7 3.2 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-DG32J,EPS-XHE-XM-SBO2H,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 6
1.14E-7 2.69 IE-LOOPWR,EPS-DGN-FR-SBO,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-DG32J,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 7
9.78E-8 2.3 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-SBO2H,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 8
9.78E-8 2.3 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-SBO2H,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 9
9.78E-8 2.3 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-DG32J,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 10 8.17E-8 1.92 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-DG32J,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 11 7.02E-8 1.65 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-TM-DG2,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 12 7.02E-8 1.65 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-TM-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2
LER 280/11-001 A-14 CCDP Total%
Cutset 13 6.98E-8 1.64 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-FR-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,EPS-XHE-XM-SBO2H,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 14 5.86E-8 1.38 IE-LOOPWR,EPS-DGN-FR-DG3,EPS-DGN-FR-SBO,EPS-DGN-TM-DG2,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 15 5.86E-8 1.38 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-FR-SBO,EPS-DGN-TM-DG3,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 16 5.01E-8 1.18 IE-LOOPWR,EPS-DGN-FR-DG2,EPS-DGN-FR-DG3,EPS-DGN-TM-SBO,EPS-XHE-XL-NR04H,EPS-XHE-XL-NR24H4,OEP-XHE-XL-NR24H4WR,/RCS-MDP-LK-BP2 Referenced Events Event Description Probability ACP-CRB-OO-25J3 XFR BUS TO 2J BKR 2-EP-BKR-25J3 FAILS OPENS 2.39E-3 ACP-DG3-ALIGN-AWAY DG3 ALIGNED TO OPPOSITE UNIT 5.00E-1 AFW-MDP-TM-2P3A UNIT 2 AFW MD PUMP 2-FW-P-3A TEST AND MAINTENANCE 3.98E-3 AFW-PMP-CF-ALL COMMON CAUSE FAILURE OF AFW PUMPS( BOTH UNITS) 1.08E-5 AFW-SYS-LK-SGCKVS STEAM LEAKAGE THRU CKVS 27.58 & 89 (PSA )
1.00E-4 AFW-TDP-FR-2P2 UNIT 2 AFW TD PUMP 2-FW-P-2 FAILS TO RUN 3.95E-2 AFW-TDP-FS-2P2 UNIT 2 AFW TD PUMP 2-FW-P-2 FAILS TO START 6.49E-3 AFW-TDP-TM-2P2 UNIT 2 AFW TD PUMP 2-FW-P-2 TEST AND MAINTENANCE 5.39E-3 AFW-XHE-XM-CNTRL OPERATOR FAILS TO CONTROL AFW TDP 3.00E-1 AFW-XHE-XM-XTIE OPERATOR FAILS TO INITIATE AFW CROSSCONNECT 1.20E-1 CDS-XVM-CC-CN150 ECST M/U VALVE 2-CN-150 FAILS CLOSED 1.92E-4 CPC-MDP-FS-SWP10A CPC SWS TRAIN 1-SW-P-10A FAILURES TO START 1.36E-3 CPC-MDP-TM-SWP10A CPC SWS MDP 1-SW-P-10A UNAVAILABLE DUE TO T&M`
7.12E-3 DCP-BAT-LP-2BATA4HR BATTERY 2A 2-EPD-B-2A FAILURE AT 4 HOURS 1.00E+0 DCP-BAT-LP-2BATB4HR BATTERY 2B 2-EPD-B-2B FAILURE AT 4 HOURS 1.00E+0 EPS-DGN-CF-FRALL COMMON CAUSE FAILURE OF DIESEL GENERATORS TO RUN 4.57E-5 EPS-DGN-CF-FSALL COMMON CAUSE FAILURE OF DIESEL GENERATORS TO START 1.14E-5 EPS-DGN-FR-DG2 DIESEL GENERATOR 2 FAILS TO RUN 1.02E-2 EPS-DGN-FR-DG3 DIESEL GENERATOR 3 FAILS TO RUN 1.02E-2 EPS-DGN-FR-SBO SBO DIESEL GENERATOR FAILS TO RUN 1.20E-2 EPS-DGN-FS-DG3 DIESEL GENERATOR 3 FAILS TO START 2.89E-3 EPS-DGN-TM-DG2 DIESEL GENERATOR 2 UNAVAILABLE DUE TO T & M 1.43E-2 EPS-DGN-TM-DG3 DIESEL GENERATOR 3 UNAVAILABLE DUE TO T & M 1.43E-2 EPS-DGN-TM-SBO SBO DIESEL GENERATOR UNAVAILABLE DUE TO T & M 1.43E-2 EPS-SEQ-FO-DG3 DG3 SEQUENCENCER FAILS 1.76E-3 EPS-XHE-XL-NR01H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 1 HOUR 8.71E-1 EPS-XHE-XL-NR04H OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 4 HOURS 6.98E-1 EPS-XHE-XL-NR24H4 OPERATOR FAILS TO RECOVER EMERGENCY DIESEL IN 24 HOURS (GIVEN FAILURE AT 4) 4.16E-1 EPS-XHE-XM-DG32J OPERATOR FAILS TO ALIGN DG 3 TO BUS 2J 2.00E-2
LER 280/11-001 A-15 Event Description Probability EPS-XHE-XM-SBO1J OPERATOR FAILS TO ALIGN SBO DIESEL TO BUS 1J 2.00E-2 EPS-XHE-XM-SBO2H OPERATOR FAILS TO ALIGN SBO DIESEL TO BUS 2H 2.00E-2 HPI-XHE-XM-FB OPERATOR FAILS TO INITIATE FEED AND BLEED COOLING 4.00E-2 IAS-MDC-FR-1C1 INSTRUMENT AIR COMPRESSOR 1-IA-C-1 FAILS TO RUN 5.89E-2 IAS-MDC-FS-1C1 INSTRUMENT AIR COMPRESSOR 1-IA-C-1 FAILS TO START 1.71E-2 IAS-MDC-TM-1C1 INSTRUMENT AIR COMPRESSOR 1-IA-C-1 UNAVAILABLE DUE TO T&M 1.20E-2 IE-LOOPWR LOSS OF OFFSITE POWER INITIATOR (WEATHER-RELATED) 1.00E+0 OEP-XHE-XL-NR24H4WR OPERATOR FAILS TO RECOVER OFFSITE POWER IN 24 HOURS (GIVEN FAILURE AT 4, WEATHER) 1.43E-1 PPR-MOV-FC-RC1536 BLOCK VALVE 1536 CLOSED DUE TO PORV LEAKING 3.00E-1 RCS-MDP-LK-BP2 RCP SEAL STAGE 2 INTEGRITY (BINDING/POPPING OPEN)
FAILS 2.00E-1
LER 280/11-001 B-1 Appendix B: Key Event Trees Figure B-1. Surry Weather-Related LOOP event tree.
IE-LOOPWR LOSS OF OFFSITE POWER INITIATOR (WEATHER-RELATED)
FTF-LOOP RPS-L REACTOR TRIP FTF-SBO EPS Emergency Power FTF-LOOP-RECOVERY AFW AUXILIARY FEEDWATER PORV PORVs ARE CLOSED FTF-LOSC LOSC RCP SEAL COOLING MAINTAINED FTF-LOOP-RECOVERY HPI HIGH PRESSURE INJECTION FTF-LOOP-RECOVERY FAB FEED AND BLEED OPR-06H OFFSITE POWER RECOVERY IN 6 HRS FTF-LOOP-RECOVERY CSR CONTAINMENT SPRAY RECIRC FTF-LOOP-RECOVERY HPR HIGH PRESSURE RECIRC End State (Phase - CD) 1 OK LOSC-L 2
LOOP-1 PORV-L 3
OK 4
CD 5
CD 6
OK HPR-L 7
CD CSR-L 8
CD HPI-L 9
CD AFW-L 10 OK 11 CD 12 CD 13 OK HPR-L 14 CD CSR-L 15 CD FAB-L 16 CD 17 SBO 18 ATWS 19 CD
LER 280/11-001 B-2 Figure B-2. Surry SBO event tree.
FTF-SBO EPS Emergency Power FTF-SBO AFW-B AUXILIARY FEEDWATER PORV PORVs ARE CLOSED RSD RAPID SECONDARY DEPRESSURIZATION
BP1 RCP SEAL STAGE 1 INTEGRITY (BINDING/POPPING)
O1 RCP SEAL STAGE 1 INTEGRITY (O-RING EXTRUSION)
BP2 RCP SEAL STAGE 2 INTEGRITY (BINDING/POPPING)
O2 RCP SEAL STAGE 2 INTEGRITY (O-RING EXTRUSION)
OPR-04H OFFSITE POWER RECOVERY (IN 4 HR)
DGR-04H DIESEL GENERATOR RECOVERY (IN 4 HR)
End State (Phase - CD) 21 gpm/rcp 1
OK 2
OK 3
SBO-4 182 gpm/rcp 4
SBO-1 5
OK 6
CD 76 gpm/rcp 7
SBO-1 8
OK 9
SBO-4 480 gpm/rcp 10 SBO-1 OPR-02H 11 OK DGR-02H 12 CD 21 gpm/rcp 13 SBO-2 14 OK 15 SBO-4 172 gpm/rcp 16 SBO-2 OPR-03H 17 OK DGR-03H 18 CD 182 gpm/rcp 19 SBO-2 OPR-03H 20 OK DGR-03H 21 CD 61 gpm/rcp 22 SBO-2 23 OK 24 SBO-4 300 gpm/rcp 25 SBO-2 OPR-02H 26 OK DGR-02H 27 CD 300 gpm/rcp 28 SBO-2 OPR-02H 29 OK DGR-02H 30 CD 76 gpm/rcp 31 SBO-2 32 OK 33 SBO-4 300 gpm/rcp 34 SBO-2 OPR-02H 35 OK DGR-02H 36 CD 480 gpm/rcp 37 SBO-2 OPR-02H 38 OK DGR-02H 39 CD PORV-B 40 SBO-2 OPR-01H 41 OK DGR-01H 42 CD 43 SBO-3 OPR-01H 44 OK DGR-01H 45 CD