05000336/FIN-2013005-02
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Finding | |
|---|---|
| Title | Inadequate Alternative Shutdown Procedure |
| Description | The inspectors identified an NCV of Millstone Unit 2 Operating License Condition 2.C. (3) for failure to implement and maintain all aspects of the approved Fire Protection Program (FPP). Specifically, Dominion had not adequately implemented an alternative shutdown procedure, as required by 10 CFR 50, Appendix R, Section III.L.3 and the approved FPP. The procedure for a Unit 2 fire, which could lead to control room abandonment, did not ensure the electrical distribution system was correctly configured prior to re-energizing alternating current (AC) buses. As a result, an over-current condition could occur and trip the 4 kilovolt (kV) supply breaker complicating safe shutdown operations and delaying AC bus recovery. In response to this issue, Dominion promptly revised their fire safe shutdown operating procedure prior to the end of the inspection to correct this deficiency. This finding was more than minor because it was associated with the protection against external factors (e.g., fire) attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the availability and reliability of systems that respond to initiating events to prevent undesirable consequences. The inspectors evaluated the finding in accordance with IMC 0609, Appendix F, Fire Protection SDP. This finding affected the post-fire safe shutdown category and was determined to have a high degradation rating because the alternative shutdown procedure lacked adequate instructions to ensure correct equipment alignment. A Phase 3 SDP analysis determined that this finding was of very low safety significance (Green) because the best estimate of core damage frequency (? CDF) was in the mid E-7 per year range. This finding did not have a cross-cutting aspect because it was considered to not be indicative of current licensee performance. |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2013005 Section 4OA5 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | J Richmond P Presby R Mckinley R Rolph S Barr B Haagensen D Silk J Ambrosini J D'Antonio J Krafty |
| Violation of: | 10 CFR 50 Appendix R License Condition - Fire Protection License Condition |
| INPO aspect | |
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Finding - Millstone - IR 05000336/2013005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2013Q4
Self-Identified List (Millstone)
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