05000454/FIN-2009007-01
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Finding | |
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| Title | Failure to Maintain/Extend the Qualification Basis for Molded-Case Circuit Breakers (MCCBs) Used In Safety-Related Applications Greater than 20 Years. |
| Description | A finding of very low safety significance (Green) and associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified by the inspectors for the failure to maintain the qualification bases for safety-related equipment. Specifically, the licensee failed to maintain/extend the qualified life of the Westinghouse molded case circuit breakers (MCCBs) after the manufacturers qualifications ended at 20 years as required by 10 CFR Part 50, Appendix A and B. As a result, the licensee issued a condition report and performed an engineering evaluation, which supported continuing qualification of the MCCBs and an operability evaluation, which found the MCCBs operable. The inspectors determined that the finding was more than minor because not maintaining qualified components in safety-related systems structures and components (SSCs) could lead to the inability to respond to design basis events. The finding screened as of very low safety significance because the finding was a design or qualification deficiency confirmed not to result in loss of operability or functionality. The inspectors identified a cross-cutting aspect associated with this finding in the area of problem identification and resolution because the licensee did not effectively incorporate pertinent manufacturers operating experience into maintaining the qualification of the MCCBs. (P.2.(b) |
| Site: | Byron  |
|---|---|
| Report | IR 05000454/2009007 Section 1R21 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | A Dunlop Z Falevits C Brown C Baron S Lewis J Gilliam A Stone A Della Grec |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Byron - IR 05000454/2009007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Byron) @ 2009Q1
Self-Identified List (Byron)
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