05000482/FIN-2012008-01
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Finding | |
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Title | Review Main Generator Output Breaker Fault Cause |
Description | At the time that the team left the site, the licensee had not determined the root cause of the main generator output breaker 345-60 fault. It was unclear if the root cause could be determined based on the damage that was identified internal to the breaker. Therefore, the inspectors focused on the licensees determination of the most probable cause and the method that the licensee used to reach that conclusion. The licensee and Westar (the company that operates the switchyard at Wolf Creek) representatives cooperated with the breaker manufacturer, HVB, to conduct a failure analysis at the HVB plant. In addition, Westar contracted the National Electric Energy Testing Research and Applications Center to provide an independent failure analysis. Based on the resulting failure analysis, the licensee made a preliminary determination that the failure of the 345-60 breaker was most likely due to internal particulate contamination introduced during manufacturing, but they were still waiting for an independent review of the failure mode data and for isotopic analysis of residue from inside the breaker to finalize that conclusion. The NRC will review the final cause assessment for the 345-60 breaker fault, which will be tracked as URI 05000482/2012008-01, Review Main Generator Output Breaker Fault Cause. |
Site: | Wolf Creek ![]() |
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Report | IR 05000482/2012008 Section 4OA5 |
Date counted | Mar 31, 2012 (2012Q1) |
Type: | URI: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 93800 |
Inspectors (proximate) | G Replogle J Dixon J Watkins M Baquera M Runyan N O'Keefe N Okonkwoj Dixonj Robles J Watkins M Haire M Runyan N O'Keefe B Correll G Matharu |
INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2012008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2012Q1
Self-Identified List (Wolf Creek)
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