05000277/FIN-2011010-01
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Finding | |
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| Title | Inadequate Corrective Actions Associated With SRV Lift Setpoint Drift |
| Description | The inspectors identified a finding of very low safety significance (Green) involving a NCVof 10 CFR 50, Appendix B, Criterion XVI, Corrective Action, because Exelon staff did not implement timely corrective action associated with safety relief valve (SRV)/safety valve (SV) lift setpoint drift in excess of Technical Specification (TS) 3.4.3, Safety Relief Valves and Safety Valves requirements. Specifically, Exelon staff did not implement timely or adequate actions to correct SRV lift setpoint drift that, on four occasions since 2004, has exceeded TS acceptance criteria and resulted in repeat TS violations. The station entered this issue into their corrective action program (CAP) as issue report (IR) 1250472 to evaluate the corrective actions needed to address this issue including evaluation of the proposed revision to the Peach Bottom licensing basis through a TS amendment. The inspectors determined that the finding was more than minor because it was associated with the equipment performance attribute of the Mitigating Systems cornerstone and affected the cornerstone objective of ensuring the capability and reliability of systems that respond to initiating events to prevent undesirable consequences (Le., core damage). Specifically, SRVs continue to experience reliability challenges regarding SRV/SV lift setpoint drift and the station remains vulnerable to future TS compliance issues. The inspectors evaluated the significance of this finding using IMC 0609.04, Phase 1 -Initial Screening and Characterization of Findings. The inspectors determined that this finding was of very low safety significance (Green) because the finding was not a design or qualification deficiency, did not represent a loss of safety system function, and did not screen as potentially risk-significant due to external initiating events. The inspectors' review did not identify a loss of SRVlSV safety function with regard to SRVs/SVs being able to lift within the necessary pressure range to maintain margin to design pressure and stress limits. The finding has a cross-cutting aspect in the area of problem identification and resolution, corrective action program, because Exelon personnel did not implement timely corrective actions to address a longstanding SRV tolerance setpoint condition that has resulted in multiple TS compliance violations. |
| Site: | Peach Bottom  |
|---|---|
| Report | IR 05000277/2011010 Section 4OA2 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Ziedonis P Krohn S Ibarrola E Miller |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
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Finding - Peach Bottom - IR 05000277/2011010 | ||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Peach Bottom) @ 2011Q3
Self-Identified List (Peach Bottom)
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