05000259/FIN-2008007-01
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Finding | |
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| Title | |
| Description | An NRC-identified, Green, non-cited violation of 10 CFR 50, Appendix B, Criterion II, Quality Assurance Program, was identified for the licensees failure, between April 2000 and January 2008, to carry out the Nuclear Quality Assurance Plan policy in that trend analysis performed on adverse conditions did not result in trend results which identified vibration-induced, failed or degraded residual heat removal (RHR) heat exchanger (Hx) service water (SW) outlet flow control valves (FCVs) as an adverse trend that needed increased management attention. Between April 2000 and January 2008, there were 17 instances of failed or degraded Unit 2 and 3 RHR Hx SW outlet FCVs due to vibration-induced damage entered into the licensees corrective action program (CAP). This issue has been identified in the licensees CAP as PER 159606. Corrective actions associated with the vibration-induced damage included actions to replace Units 2 and 3 RHR Hx SW outlet FCVs with the same valves used on Unit 1 and to reconfigure all three units with a smaller bypass valve around the RHR Hx SW outlet FCVs. This finding was more than minor because it affected the Mitigating System cornerstone objective of ensuring the reliability of systems that respond to initiating events to prevent undesirable consequences and the cornerstones attribute of equipment performance. Using the Significance Determination Process, the finding was determined to be of very low safety significance due to the RHR Hx SW outlet FCV occurrences, in which the RHR Hx SW outlet FCVs would not perform their safety function, did not represent an actual loss of a safety function of a single RHR SW train for greater than its Technical Specification allowed outage time. The cause of this finding was directly related to the Trend Performance in the CAP cross-cutting aspect of the Problem Identification and Resolution cross-cutting area, in that, the licensee failed to properly assess information in their CAP to identify the common cause problem of vibration-induced degraded and inoperable RHR Hx SW outlet FCVs.(P.1(b)). (Section 4OA2.f |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2008007 Section 4OA2 |
| Date counted | Dec 31, 2008 (2008Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | D Mas-Penaranda D Merzke C Stancil J Rivera-Ortiz R Taylor S Atwater |
| CCA | P.4, Trending |
| INPO aspect | PI.4 |
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Finding - Browns Ferry - IR 05000259/2008007 | |||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2008Q4
Self-Identified List (Browns Ferry)
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