05000286/FIN-2010002-02
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Finding | |
|---|---|
| Title | Preconditioning of RWST Level Switch |
| Description | An NRC-identified non-cited violation (NCV) of very low safety significance of 10CFR 50, Appendix B, Criterion XI, Test control, was identified because Entergy technicians conducted unacceptable preconditioning by cycling the Refueling Water Storage Tank (RWST) 10-10 level alarm switch prior to recording the as-found set-point during Technical Specification Surveillance Requirement (SR) 3.5.4.5.The finding was more than minor because the finding was associated with the Mitigating Systems cornerstone attribute of procedure quality and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, preconditioning of the RWST Lo-Lo Level Alarm switch could mask its actual as-found condition and result in an inability to verity its operability, as well as make it difficult to determine whether the switch would perform its intended safety function during an event. The inspectors evaluated the finding using IMC0609, Attachment 4, Initial Screening and Characterization of Findings, and determined the finding was of very low safety significance because the finding is not a design or qualification deficiency, did not result in the loss of a safety function, and was not risk significant due to. external events. The inspectors determined that this finding had a cross-cutting aspect in the area of Problem Identification and Resolution because Entergy did not implement and institutionalize operating experience (OE) through changes to station processes, procedures, equipment, and training programs. Specifically, Entergy did not utilize NRC published guidance and lessons learned from recent preconditioning incidents at Entergy sites to preclude preconditioning the RWST Lo-Lo Level Alarm Switch prior to recording the as-found switch set-point. |
| Site: | Indian Point  |
|---|---|
| Report | IR 05000286/2010002 Section 1R22 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | E Keighley J Noggle M Gray M Halter P Cataldo S Barr |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Indian Point - IR 05000286/2010002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Indian Point) @ 2010Q1
Self-Identified List (Indian Point)
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