05000293/FIN-2011007-03
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Finding | |
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| Title | Inadequate Evaluation of the Affect of Non Class I Equipment Internal Flooding on Redundant Safety Related Equipment |
| Description | The team identified a finding of very low safety significance involving a non-cited violation (NCV) of 10 CFR Part 50, Appendix B, Criterion III, Design Control, because Entergy did not verify the adequacy of the design with respect to ensuring that safety related equipment would be adequately protected from a postulated flood originating in the turbine building. Specifically, Entergy did not correctly evaluate a failure of seawater system piping or equipment that could challenge the doors separating the turbine building from the reactor building auxiliary bay, which would require timely operator identification and action to secure the seawater pumps to prevent the common mode failure of redundant safety-related components. Entergy entered the issue into their corrective action program, evaluated the immediate operability of systems potentially affected by the postulated flooding scenario, and provided interim guidance to operators. The performance deficiency was determined to be more than minor because it was associated with the design control attribute of the Mitigating Systems Cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The team evaluated the finding in accordance with IMC 0609, Appendix A, Significance Determination of Reactor Inspection Findings for At-Power Situations, and completed a Phase 3 risk evaluation using the Pilgrim Standardized Plant Analysis Risk (SPAR) model, Revision 8.15 and SAPHIRE 8. Based upon the Phase 3 evaluation, the finding was determined to be of very low safety significance. The finding was not assigned a cross-cutting aspect because it was a historical design issue not indicative of current performance. |
| Site: | Pilgrim |
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| Report | IR 05000293/2011007 Section 1R21 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | J Lilliendahl C Baron J Schoppy F Arner J Brand S Kobylarz L Doerflein |
| INPO aspect | |
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Finding - Pilgrim - IR 05000293/2011007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Pilgrim) @ 2011Q4
Self-Identified List (Pilgrim)
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