05000400/FIN-2011008-06
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Finding | |
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Title | Failure to Extend the Design Life for Molded-Case Circuit Breakers |
Description | The team identified a Green, NCV of 10 CFR Part 50, Appendix B, Criterion XI, Test Control, involving the licensees failure to include 79 safetyrelated MCCBs in the circuit breaker test program. Immediate corrective actions included review of breaker performance history to address operability concerns. Permanent corrective actions are still being pursued by the licensee. The licensee entered this issue into the CAP as NCR 460953. The inspectors determined that the failure to periodically test safety related MCCBs was a performance deficiency. The finding was more than minor because it affected the Mitigating Systems Cornerstone attribute of Design Control, and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, not confirming satisfactory performance of safety-related MCCBs could lead to the inability of equipment to respond to design basis events. The finding was of very low safety significance because it was a test deficiency confirmed not to result in loss of operability or functionality. The team determined that no cross cutting aspect was applicable to this performance deficiency because this finding was not indicative of current licensee performance. |
Site: | Harris |
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Report | IR 05000400/2011008 Section 1R21 |
Date counted | Jun 30, 2011 (2011Q2) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21 |
Inspectors (proximate) | S Walker C Baron G Skinner P Higgins D Mas-Penaranda R Patterson B Desai D Terri-Ward |
INPO aspect | |
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Finding - Harris - IR 05000400/2011008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Harris) @ 2011Q2
Self-Identified List (Harris)
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