05000286/FIN-2010003-02
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Finding | |
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Title | Inadequate Operability Evaluation for Neutron Detector N-38 Anomalous Behavior |
Description | An NRC-identified NCV of very low safety significance of 10 CFR 50, Appendix B, Criterion V, \\\"Instructions, Procedures, and Drawings,\\\" was identified because Entergy personnel did not perform an adequate operability evaluation in accordance with procedure EN-OP-104, \\\"Operability Determination Process.\\\" Specifically, Entergy personnel did not incorporate interdisciplinary input and adequate technical information to ensure the continued operability of the neutron detector N-38 when testing and subsequent troubleshooting indicated that the N-38 LVPS was degraded on September 24, 2009. As a result, N-38 was not declared inoperable until October 14, 2009, when Entergy personnel recognized that the LVPS had failed and took action to replace the LVPS. Entergy staff performed a past operability evaluation and determined that N-38 was inoperable since September 15, 2009. Entergy personnel entered this issue into their corrective action program. Corrective actions planned include providing neutron detector system training to maintenance and engineering, revising procedural requirements for identifying and correcting potential neutron detector performance issues and revising LER 2009-009 to report the additional N-38 inoperability identified during the past operability review. The finding is more than minor because it is associated with the Equipment Performance attribute of the Mitigating Systems cornerstone and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, because N-38 was inappropriately determined to be operable on September 24, 2009, N-38 accrued an additional 21 days of inoperability, during which time it was unable to perform its safety function. A Region I SRA evaluated the significance of the finding using IMC 0609, Appendix F, \\\"Fire Protection Significance Determination Process,\\\" and qualitatively determined that the finding screened as very low safety significance (Green) because it only affected the ability to reach and maintain cold shutdown conditions. The inspectors determined that this finding had a cross-cutting aspect in the area of Human Performance within the Decision Making component because Entergy staff did not make safety-significant decisions using a systematic process, especially when faced with uncertain plant conditions, to ensure safety was maintained. Specifically, Entergy staff did not fully incorporate engineering, maintenance, and vendor input to fully evaluate and properly ascertain the operability of N-38 when instrument performance anomalies were identified in September 2009. [H.1 (a) per IMC 0310). |
Site: | Indian Point |
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Report | IR 05000286/2010003 Section 4OA7 |
Date counted | Jun 30, 2010 (2010Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | |
Inspectors (proximate) | D Caron D Molteni F Arner J Noggle K Young M Gray M Halter M Patel P Cataldo |
CCA | , |
INPO aspect | DM.1 |
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Finding - Indian Point - IR 05000286/2010003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Indian Point) @ 2010Q2
Self-Identified List (Indian Point)
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