05000219/FIN-2013003-01
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Finding | |
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| Title | Degraded Emergency Diesel Generator Bypass Sight Glass not identified in the Corrective Action Program |
| Description | The inspectors identified a Green NCV of 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, because Exelon did not promptly identify a condition adverse to quality. Specifically, from December 10, 2012 to April 4, 2013, Exelon did not identify that the fuel bypass sight glass on the #1 emergency diesel generator (EDG) was partially full. A partially full fuel bypass sight glass indicates that the bypass relief valve is degraded, challenging the operability of the emergency diesel generator because fuel could have bypassed the fuel injectors. Exelon entered this issue into the corrective action program for resolution as issue report (IR) 1497683 and subsequently replaced a degraded relief valve in the bypass sight glass. This finding is more than minor because it is associated with the design control attribute of the Mitigating Systems cornerstone and affected the cornerstone objective of ensuring the reliability and capability of systems that respond to initiating events to prevent undesirable consequences. This issue was also similar to Example 3j of NRC IMC 0612, Appendix E, Examples of Minor Issues, because the condition resulted in reasonable doubt of the operability of the #1 emergency diesel generator and additional analysis was necessary to verify operability. The inspectors evaluated the finding using exhibit 2, Mitigating System Screening Questions in Appendix A to IMC 0609, Significance Determination Process. The inspectors determined that this finding was a deficiency affecting the design or qualification of a mitigating SSC, where the SSC maintained its operability or functionality. Therefore, inspectors determined the finding to be of very low safety significance (Green). The finding has a cross-cutting aspect in the area of Problem Identification and Resolution, Corrective Action Program, because Exelon did not identify the issue associated with the degraded emergency diesel generator bypass sight glass in a timely manner. |
| Site: | Oyster Creek |
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| Report | IR 05000219/2013003 Section 1R15 |
| Date counted | Jun 30, 2013 (2013Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | B Dionne B Bollinger S Pindale G Hunegs W Schmidt J Kulp P Presby A Patel C Newport S Ibarrola |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| CCA | P.1, Identification |
| INPO aspect | PI.1 |
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Finding - Oyster Creek - IR 05000219/2013003 | ||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Oyster Creek) @ 2013Q2
Self-Identified List (Oyster Creek)
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