05000259/FIN-2011002-02
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Finding | |
|---|---|
| Title | Inadequate Corrective Actions To Address Unit 3 CR120A PCIS Relays That Exceeded Their Recommended Service Life |
| Description | An NRC identified non-cited violation of 10 CFR 50 Appendix B, Criteria XVI, Corrective Action, was identified for the licensees failure to correct a condition adverse to quality related to Unit 3 primary containment isolation system (PCIS) logic relays exceeding their in-service life expectancy. Specifically, the licensee failed to replace numerous Unit 3 PCIS CR120A relays prior to exceeding their vendors recommended service lifetime. The licensee has entered this issue into their corrective action program as problem evaluation report (PER) 348160. This finding was determined to be more than minor because it was associated with the Equipment Performance attribute of the Initiating Events Cornerstone and affected the cornerstone objective to limit the frequency of those events that upset plant stability and challenge critical safety functions during power operations. Specifically, a relay failure could cause a reactor scram, engineered safeguards (ESF) actuation, and/or Group 1, 2, 3, or 6, primary containment isolation. The significance of the finding was evaluated using Phase 1 of the significance determination process in accordance with the Inspection Manual Chapter (IMC) 0609 Attachment 4, and was determined to be of very low safety significance (Green) because it did not contribute to both the likelihood of a reactor trip and the likelihood that mitigating equipment or functions were not available. The cause of this finding was directly related to the cross cutting aspect of Appropriate Corrective Actions in the Corrective Action Program component of the Problem Identification and Resolution area, because the licensee failed to implement adequate corrective actions as part of PER 220336 to replace or extend the service life of the Unit 3 PCIS CR120A relays prior to exceeding their recommended service lifetime P.1(d). |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2011002 Section 4OA2 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Nielsen C Dykes C Fletcher C Stancil E Guthrie L Pressley M Coursey P Higgins P Niebaum R Hamilton R Patterson S Walker T Ross |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Browns Ferry - IR 05000259/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2011Q1
Self-Identified List (Browns Ferry)
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