05000336/FIN-2008003-01
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Finding | |
|---|---|
| Title | Fire Protection Deficiency Resulting in Potential Loss of All Charging Pumps |
| Description | The NRC identified a Green NCV of the Millstone Unit 3 operating license, Condition 2.H, Fire Protection, in that Dominion failed to appropriately evaluate and correct in a timely manner a fire protection program deficiency. Specifically, Dominion failed to assure that one train of charging would remain free of fire damage for fire scenarios that could produce spurious closure of a volume control tank (VCT) outlet or charging pump suction motor operated valves. This issue was first identified by Dominion in September 2004, but plans to thoroughly evaluate the issue relative to the fire protection program were extended on several occasions. Dominion initiated compensatory measures to minimize the likelihood of a fire in the affected area, to maximize the availability of the C charging pump, and to determine a long term resolution. This finding is more than minor because it is associated with the External Factors attribute (fire) of the Mitigating Systems Cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, the availability of the charging system was not ensured for nine fire scenarios. Using IMC 0609, Appendix F, Fire Protection Significance Determination Process, the inspectors conducted a Phase 1 screening, and a combination of Phase 2 and 3, to determine that this finding was of very low safety significance (Green), with an estimated total core damage frequency (CDF) of 1 in 1,400,000 years in the range of 7E-7 per reactor operating year. This finding has a cross-cutting aspect in the area of Problem Identification and Resolution, Corrective Action Program, because Dominion extended the due dates to perform a thorough evaluation of the issue. P.1(c) (Section 1R05.2 |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2008003 Section 1R05 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | T Moslak J Lilliendahl J Benjamin J Krafty D Orr S Shaffer B Norris J Commiskey H Gray E Burket |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Millstone - IR 05000336/2008003 | |||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2008Q2
Self-Identified List (Millstone)
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