05000336/FIN-2010004-07
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | TS 3.7.1.2 LCO (c) requires the TDAFW pump to be operable in Mode 1. If the pump is not operable, Action Statement (c) directs restoration within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> after which a plant shutdown to Mode 3 in six hours is required. Contrary to this requirement, on August 23, 2010, the TDAFW pump failed its quarterly surveillance test and a review of prior surveillance tests indicated that the pump had been inoperable since June 30, 2010 (a period of 54 days). Dominion had not properly evaluated the results of the previous surveillance test. During both of these tests, the TDAFW pump failed to produce an acceptable discharge flow rate because the charging pump discharge relief valve, 3FWA*RV45, leaked by its seat. Upon discovery, Dominion declared the TDAFW pump inoperable and promptly repaired the relief valve. Dominion entered the issue into their corrective action program (CR392003), and restored the TDAFW pump to an operable condition. The finding is of very low safety significance because the TDAFW pump was later determined to be available to support core heat removal during the period when the relief valve was degraded. |
| Site: | Millstone  |
|---|---|
| Report | IR 05000336/2010004 Section 4OA7 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | T Moslak D Jackson B Haagensen J Krafty S Shaffer M Balazik L Kauffman K Modes |
| INPO aspect | |
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Finding - Millstone - IR 05000336/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Millstone) @ 2010Q3
Self-Identified List (Millstone)
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