05000220/FIN-2008003-03
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Finding | |
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Title | Failure to Appropriately Evaluate the Effect of Accelerated Agin of J-10 Relays |
Description | A self-revealing non-cited violation (NCV) of 10 CRF 50, Appendix B, Criterion XVI, \"Corrective Action,\" was identified on March 22, 2008, when the Unit 2 Division I emergency diesel generator (EDG) service water (SW) return isolation valve failed to fully open following a start of the Division I EDG, thus challenging the EDG\'s ability to perform its safety function. The motor operated valve (MOV) malfunction was due to age-related failure of the J-10 relay in the MOV control circuit. The susceptibility of J- 10 relays to age-related failure had been previously identified; however, NMPNS did not take action to establish a maintenance strategy to replace these relays prior to failure. As corrective action, the EDG was declared inoperable, the J-10 relay was replaced, and an extent of condition review was initiated. The finding was greater 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. The finding was evaluated in accordance with IMC 0609, Attachment 4, and determined to be of very low safety significance per the SDP Phase one determination because the finding was not a design or qualification deficiency, did not represent a loss of a system/train safety function, and did not screen as potentially risk significant due to external events. (Section 1R22 |
Site: | Nine Mile Point |
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Report | IR 05000220/2008003 Section 1R22 |
Date counted | Jun 30, 2008 (2008Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | Self-revealing |
Inspection Procedure: | IP 71111.22 |
Inspectors (proximate) | D Dempsey J Furia A Rosebrook E Knutson R Cureton B Bickett |
INPO aspect | |
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Finding - Nine Mile Point - IR 05000220/2008003 | ||||||||||||||||||||||||||||||||||||||||||
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Finding List (Nine Mile Point) @ 2008Q2
Self-Identified List (Nine Mile Point)
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