05000333/FIN-2009004-02
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Finding | |
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Title | Licensee-Identified Violation |
Description | TS 3.3.8.1 requires that multiple independent channels of the Emergency Onsite Power System Loss of Power (LOP) instrumentation be operable to maintain operability of the emergency diesel generators. Contrary to this, on July 7, 2009, with the plant operating at 100% power (Mode 1), Entergy personnel conducted an instrument calibration on the 4.16 KV Emergency Bus Degraded Voltage Time Delay Relays, and determined that the as-found delay time for relays 71-27T2-1 HOEB03, 71-27T3-HOEB03, and 71-27T3-1 HOEA03, associated with the 4.16 kV emergency buses 10500 and 10600 degraded grid protection, exceeded the TS allowable values. As a result, multiple independent channels of the Emergency Onsite Power System LOP Instrumentation were inoperable and the plant exceeded TS 3.3.8.1, Condition A completion time during the surveillance interval. This finding was determined to be of very low safety significance (Green) because the relays and EDGs would have performed their safety functions in all cases. Specifically, the relays remained capable of performing their safety function of allowing their associated electrical bus to swap its supply from the offsite grid to the respective on-site EDGs prior to the loss or damage of any supplied equipment. Entergys corrective actions included the replacement of the relays in July 2009 with solid-state electronic timers and initiation of CR-JAF-2009-02397 and CR-JAF-2009-02403. |
Site: | FitzPatrick |
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Report | IR 05000333/2009004 Section 4OA7 |
Date counted | Sep 30, 2009 (2009Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Licensee-identified |
Inspection Procedure: | |
Inspectors (proximate) | M Patel S Rutenkroger G Hunegs B Welling P Presby J Nicholson M Balazik |
INPO aspect | |
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Finding - FitzPatrick - IR 05000333/2009004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (FitzPatrick) @ 2009Q3
Self-Identified List (FitzPatrick)
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