05000321/FIN-2009005-05
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Finding | |
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| Title | Reactor Building Equipment Drain Sump Level Detection is Not Single Failure Proof |
| Description | The NRC identified a Green non-cited violation of 10 CFR 50, Appendix B, Criterion III, Design Control, for the failure to translate the design bases as stated in the FSAR into specifications for Units 1 and 2. Specifically, single failure design criteria for the reactor building sump level instrumentation has not been met since initial plant operation. The licensee initiated CRs (2009105744, 2009105110, 2009105111, 2009105615, and 2009105727) and administratively closed flood isolation valves as an interim compensatory measure. The team determined that the licensees failure to install single failure proof level switches as stated in the UFSAR was a performance deficiency. This finding is more than minor because it is associated with the design control attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, a failure of a level switch would adversely impact the automatic closure of flood isolation valves that protect safety related equipment during a design bases internal flooding event. This finding was assessed using the Phase 1 screening worksheet of the SDP and determined a Phase 3 analysis was required. Phase 3 results characterized the performance deficiency as very low safety significance (Green) based on risk. A cross-cutting aspect was not identified because the finding does not represent current performance |
| Site: | Hatch  |
|---|---|
| Report | IR 05000321/2009005 Section 4OA5 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Caballero D Jones E Morris G Macdonald J Eargle P Niebaum S Shaeffer |
| INPO aspect | |
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Finding - Hatch - IR 05000321/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Hatch) @ 2009Q4
Self-Identified List (Hatch)
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