05000361/FIN-2013002-04
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Finding | |
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| Title | Untimely Corrective Actions for Nitrogen Gas Accumulation in the Auxiliary Feedwater System |
| Description | The inspectors identified a Green noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Actions, associated with the licensees failure to take appropriate and prompt corrective actions regarding nitrogen gas accumulation in the safety-related auxiliary feedwater system. Specifically, from March 2012 until January 2013, a condition adverse to quality related to the - 6 - accumulation of gas, from steam generator nitrogen purge into piping and safety-related pumps in the Unit 2 auxiliary feedwater system, was not promptly identified and corrected until a gas binding event occurred during a start of an auxiliary feedwater pump in Unit 3 on January 2, 2013. This issue has been entered into the licensees corrective action program as Nuclear Notifications NN 202268941 and NN 202382092. The inspectors determined that the failure to take prompt corrective actions for nitrogen gas accumulation in the safety-related auxiliary feedwater system as required by 10 CFR Part 50, Appendix B, Criterion XVI was a performance deficiency. The performance deficiency was more than minor, and therefore a finding, because it was associated with the Mitigating Systems Cornerstone attribute for equipment performance and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The inspectors determined that Manual Chapter 0609, Appendix G, Shutdown Operations Significance Determination Process, was appropriate based on the plant conditions present when this performance deficiency occurred. The finding did not require a quantitative assessment because adequate mitigating equipment remained available and the finding did not constitute a loss of control, as defined in Appendix G. Therefore, the finding screened as having very low safety significance (Green). The inspectors determined that the finding had a crosscutting aspect in the area of the human performance decision-making component, because the licensee did not make safety-significant or risk-significant decisions using a systematic process when they identified a degraded condition of gas accumulation in the auxiliary feedwater system |
| Site: | San Onofre  |
|---|---|
| Report | IR 05000361/2013002 Section 4OA2 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | N Taylor R Lantz G George S Garchow J Reynoso J Laughlin G Warnick B Parks E Uribe S Hedger N Hernandez M Williams C Hale |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| CCA | H.13, Consistent Process |
| INPO aspect | DM.1 |
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Finding - San Onofre - IR 05000361/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (San Onofre) @ 2013Q1
Self-Identified List (San Onofre)
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