05000293/FIN-2011008-02
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Finding | |
|---|---|
| Title | Torus Air Temperature 10 CFR 50.65(a)(2) Performance Demonstration Not Met |
| Description | The NRC identified a NCV of 10 CFR 50.65, Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants, paragraph (a)(2), for Entergy\'s failure to adequately demonstrate primary containment system (a)(2) performance was effectively controlled through performance of appropriate preventive maintenance. Specifically, as evidenced by repeat functional failures of torus air temperature indication during the fall of 2009 and January 2010, the (a)(2) performance demonstration was no longer justified in accordance with Entergy\'s maintenance rule implementing procedure guidance. Entergy entered this issue in their corrective action process (CR-PNP-201100880) to evaluate corrective actions needed to address this issue. 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 adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, failures of torus air temperature indication present a challenge to operators who rely on the indication to diagnose and respond to initiating events. Per the guidance provided in Inspection Procedure 71111.12, Maintenance Effectiveness, issued 11/16/2009, inspectors considered this performance deficiency to be a Category III finding since a historical review revealed a continuing declining trend in performance of the instrument, as indicated by additional functional failures. Because this issue was classified as Category III, the inspectors determined 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 it 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 determined that this finding has a cross cutting aspect in the area of problem identification and resolution. Specifically, Entergy did not properly evaluate and classify the torus air temperature indication failures with respect to the maintenance rule. |
| Site: | Pilgrim |
|---|---|
| Report | IR 05000293/2011008 Section 4OA2 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | D Jackson C Bickett B Smith J Deboer |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Pilgrim - IR 05000293/2011008 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Pilgrim) @ 2011Q1
Self-Identified List (Pilgrim)
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