05000400/FIN-2011008-04
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Finding | |
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Title | Non-conservative Calculations for Motor Control Center Control Circuit Voltage |
Description | The team identified a Green, NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, involving the licensees failure to perform adequate calculations for Motor Control Center (MCC) control circuit voltage. Immediate actions included testing the MCC contactors to address operability concerns. Permanent corrective actions are still being evaluated by the licensee. The licensee entered this issue into the CAP as NCR 460895. The failure to perform adequate calculations for MCC control circuit voltage was a performance deficiency. This 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, there was reasonable doubt as to whether safety-related contactors associated with the MCCs would have adequate voltage to operate under degraded voltage conditions. The finding was of very low safety significance since this was a design deficiency confirmed not to have resulted in a loss of operability or functionality. The inspectors did not identify a cross cutting aspect for this finding 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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