05000352/FIN-2010007-02
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Finding | |
|---|---|
| Title | Three of Four RHR Unit Coolers Unreliable due to Planned and Unplanned Conditions (Silting) |
| Description | The inspectors identified a violation of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, in that Exelon failed to correct a condition adverse to quality for a safety related support system that was essential to successful mitigating system operation. Specifically, for a six and one half day period during July 2008, three of four residual heat removal unit coolers were either unavailable or made unreliable due to a series of planned and unplanned conditions (silting). The inspectors determined that the failure to correct a condition adverse to quality in accordance with 10 CFR 50 Appendix B, Criterion XVI, during the timeframe of June 1, 2008 to September 14, 2008, contributed to the unreliability of the 1C-V21 0 unit cooler and was a performance deficiency. Specifically, Exelon did not initiate bi-weekly flushing per RT-6-011603- 0 of the 1C-V21 0 unit cooler to minimize the effects of silt build up. This finding is more than minor because it affected the equipment performance attribute of the Mitigating System cornerstone and the associated cornerstone objective of ensuring the reliability and availability of systems that respond to initiating events to prevent undesirable consequences. This issue was also similar to example 3.j. in NRC IMC 0612, Appendix E, Examples of Minor Issues, in that it resulted in a condition where there was a reasonable doubt on the operability of the 1C-V210 unit cooler. The inspectors assessed this finding in accordance with IMe 0609, Attachment 4, Phase 1, Initial Screening and Characterization of Findings, and determined that it was of very low safety significance (Green) since it was determined that the error did not result in a loss of the system\\\'s safety function. The inspectors determined that this violation had a cross-cutting aspect in the area of Problem Identification and Resolution, Corrective Action Program, in that Exelon did not take appropriate corrective actions to address a condition adverse to quality in a timely manner, commensurate with its safety significance and complexity. Specifically, Exelon failed to take appropriate actions to initiate bi-weekly flushes of the 1C-V21 0 unit cooler, upon discovery of conditions conducive to silt buildup during June through September 2008 |
| Site: | Limerick  |
|---|---|
| Report | IR 05000352/2010007 Section 4OA2 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | C Bickett G Barber J Bream P Krohn R Montgomery |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Limerick - IR 05000352/2010007 | |||||||||||||||||||||||||||||||||||||||
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Finding List (Limerick) @ 2010Q4
Self-Identified List (Limerick)
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