05000352/FIN-2009004-02
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Finding | |
|---|---|
| Title | Failure to Correct 480V Breaker Thermography |
| Description | The inspectors identified a Green NCV of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for failing to correct a condition adverse to quality associated with the performance of thermography on safety-related breakers. Specifically, although Exelon identified that the failure to perform thermography on breakers in a loaded condition was a causal factor for an electrical fault that occurred in January 2009, Exelon did not implement proper corrective actions to ensure that applicable future thermography examinations would be conducted while the equipment was in a loaded condition. Exelon entered this issue into the CAP as IR 874599, Assignment 58. Corrective actions included adding 48 breakers to the list of breakers that will be loaded prior to thermography and creating an assignment to formally assess the remaining breakers that may not receive routine thermography due to not being in a loaded condition. The finding was more than minor because it was associated with the equipment performance attribute of the Mitigating Systems cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors assessed the finding using Phase 1 of IMC 0609, Attachment 4, Phase 1 Initial Screening and Characterization of Findings and determined the finding to be of very low safety significance because it was not a design or qualification deficiency, did not represent a loss of system safety function, and did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. This finding has a cross-cutting aspect in the area of Problem Identification and Resolution, Corrective Action Program, because Exelon did not take appropriate corrective actions to address a safety issue P.1(d). Specifically, although the failure to perform thermography on breakers in loaded conditions was identified as a causal factor for an electrical fault, actions were not taken in a timely manner to ensure loaded conditions for applicable future thermography examinations |
| Site: | Limerick  |
|---|---|
| Report | IR 05000352/2009004 Section 4OA2 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | E Dipaolo T Moslak J Lilliendahl J Kulp N Sieller P Krohn E Torres N Lafferty |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Limerick - IR 05000352/2009004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Limerick) @ 2009Q3
Self-Identified List (Limerick)
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