05000352/FIN-2009005-02
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Finding | |
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| Title | Failure to Identify Degraded Instrument Line in Emergency Service Water System |
| Description | The inspectors identified a Green NCV of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for Exelon\'s failure to identify a condition adverse to quality associated with the \'A\' ESW pump discharge pressure instrument line. Specifically, Exelon had previous opportunity to identify and repair a degraded \'A\' ESW instrument line following a leak on a similar instrument Iine in August 2008. However, the degraded condition of the \'A\' instrument line was not detected until it resulted in a through-wall leak on November 7,2009. In response to the leak, Exelon was required to isolate the \'A\' ESW pump and enter the associated 45-day TS action statement. Exelon entered this issue into their corrective action program as Issue Report (IR) 990204 and IR 993012. Corrective actions included performing an investigation and scheduling extent of condition testing on the remaining 18similar instrument lines. The finding is more than minor because it is associated with the Equipment Performance attribute of the Mitigating Systems cornerstone, and it impacted the cornerstone objective of ensuring the availability of systems that respond to initiating events to prevent undesirable consequences. Specifically, upon discovery of the through-wall leak, Exelon was required to isolate the \'A\' ESW pump and enter the associated 45 day TS action statement. The finding is of very low safety significance because it did not represent the loss of a TS train for greater than its allowed outage time. This finding has a cross-cutting aspect of Problem Identification and Resolution, Corrective Action Program, because Exelon did not take appropriate corrective actions to address a safety issue regarding corrosion in the ESW instrument lines P.1(d). Specifically, although Exelon directed non-destructive examination (NDE) be performed to identify degraded ESW instrument lines, Exelon failed to ensure the scope of the NDE was sufficient to identify the degraded condition in the \'A\'ESW pump instrument line |
| Site: | Limerick  |
|---|---|
| Report | IR 05000352/2009005 Section 1R12 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | A Rosebrook N Sieller P Krohn E Torres N Lafferty E Dipaolo W Schmidt |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Limerick - IR 05000352/2009005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Limerick) @ 2009Q4
Self-Identified List (Limerick)
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