05000286/FIN-2009005-04
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Finding | |
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| Title | Failure to Promptly Identify and Correct a MCCB Service Life Nonconformance |
| Description | An NRC-identified non-cited violation (NCV) of very low safety significance of 10 CFR 50, Appendix B, Criterion XVI, Corrective Actions, was identified because Entergy personnel did not promptly identify and correct a condition adverse to quality regarding molded-case circuit breaker (MCCB) nonconformance. Specifically, in 2004, Entergy personnel determined that a population of MCCBs in safety related applications were beyond the design life as specified in Westinghouse Technical Bulletin, TB-04-13. However, Entergy's scheduled replacement timeframe (through 2011) for those affected safety related MCCBs was not consistent with the safety significance of the issue or adequately supported through an engineering justification considering, at that time, a number of the MCCBs were in service for greater than the 20-year design life. The finding was more than minor because the finding was associated with the Mitigating Systems cornerstone attribute of equipment performance and affected the cornerstone objective of ensuring the reliability of the electrical distribution system to respond to initiating events to prevent undesirable consequences. Specifically, the MCCB breakers that exceeded their expected design life could impact their reliability to respond to design basis events and plant transients. The inspectors determined the finding was of very low safety significance because the finding was a design qualification deficiency confirmed not to result in loss of operability or function. Specifically, no actual loss of function could be attributed to operating with MCCBs greater than 20 years in service and the inspectors' review of an Entergy operability determination concluded the MCCBs were an operable but nonconforming condition. This finding has a cross-cutting aspect in the area of Problem Identification and Resolution because on several occasions Entergy personnel did not thoroughly evaluate MCCB qualification issues including operability and functionality considerations. This included an opportunity to evaluate the condition in 2008 when engineers identified residue indicative of grease breakdown. |
| Site: | Indian Point  |
|---|---|
| Report | IR 05000286/2009005 Section 4OA2 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | T Fish C Crisden D Orr G Newman J Commiskey J D'Antonio J Schoppy M Gray M Halter P Cataldo |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Indian Point - IR 05000286/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Indian Point) @ 2009Q4
Self-Identified List (Indian Point)
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