05000400/FIN-2011008-08
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Finding | |
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Title | Failure to Ensure Adequate Voltage for Safety Related Components |
Description | The team identified a Green, NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to establish measures to ensure safety related components had adequate voltage. The licensee entered this issue into the CAP as NCR 458640, NCR 458648 and NCR 460930, and initiated compensatory measures which included Standing Instruction 11-08 to explain that the alternate power supply to the safety related inverters could be subject to inadequate voltage. Permanent corrective actions are still being evaluated by the licensee. The licensees failure to perform an analysis to demonstrate that safety related components would have adequate voltage to operate during a design basis accident or transients was a performance deficiency. The finding was more than minor because it affected the Mitigating System Cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the licensee failed to perform an analysis that demonstrated that the loads connected to Instrument Distribution Panels (IDPs) S-I, S-II, S-III and S-IV would have adequate voltage when the IDPSs are aligned to the output of their respective 7.5kVA safety related inverter or to their respective alternate sources. The finding was of very low safety significance because it was a design issue confirmed not to result in a loss of function, did not represent an actual loss of a system safety function, did not result in exceeding a TS allowed outage time, and did not affect external event mitigation. 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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