05000338/FIN-2013004-02
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Finding | |
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| Title | Failure to Establish and Implement Adequate Preventative Maintenance Causes a Reactor Trip |
| Description | A Green self-revealing finding was identified for failure to establish and implement adequate preventative maintenance for the mechanism operated cell (MOC) switches. Specifically the licensee failed to recognize and recommend proper maintenance for these components on the C main feedwater pump motor circuit breakers. The inspectors determined that the licensees failure to establish and implement adequate preventive maintenance for MOC switches in accordance with industry guidance through EPRI, the vendor, ABB, and operating experience was a performance deficiency. The performance deficiency was more than minor because it was associated with the Initiating Events cornerstone attribute of equipment performance and adversely affected the associated cornerstone objective in that loss of conductivity across contacts 25 and 26 in the upper MOC switch for circuit breaker 2-EP-BKR-25C5 caused the spurious closure of the C main feed pump discharge valve (2-FW-MOV-250C) and indirectly resulted in a manual reactor trip. Using Inspection Manual Chapter 0609, Attachment 4, Initial Characterization of Findings, issued June 19, 2012, the finding was determined to be of very low safety significance (Green) because it was a transient initiator, but did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation equipment or functions would not be available. In addition, this finding involved the cross cutting area of human performance, the component of decision making, and the aspect of systematic process for decision, H.1(a), because the licensee did not make risk-significant decisions using a systematic process for preventative maintenance activities when they failed to recognize and recommend proper maintenance for the MOC switches. |
| Site: | North Anna  |
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| Report | IR 05000338/2013004 Section 4OA2 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | K Miller D Mills T Stephen J Kusnick M Modes L Lake S Ninh G Mccoy R Clagg G Kolcum |
| CCA | H.13, Consistent Process |
| INPO aspect | DM.1 |
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Finding - North Anna - IR 05000338/2013004 | ||||||||||||||||||||||||||||||||||||||
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Finding List (North Anna) @ 2013Q4
Self-Identified List (North Anna)
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