05000315/FIN-2015008-03
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Finding | |
|---|---|
| Title | Failure to Verify CRID Inverter Capability to Function During Fault Conditions |
| Description | The team identified a finding of very low safety significance (Green), and an associated NCV of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the failure to verify the CRID inverter capability to interrupt faulted conditions on its output during postulated design basis events. Specifically, the licensee did not ensure that the vital inverter was adequately protected from the effects of a fault occurring at the circuit non-safety related loads. The licensee captured this issue in their CAP as AR 2015-14805 and AR 2015-14807, and reasonably determined the installed non-safety related circuit protective devices would be expected to operate and protect the vital inverter during fault clearing conditions on the non-safety related loads powered by the inverter supplied CRID panel bus. The performance deficiency was determined to be more than minor because it was associated with the equipment performance attribute of the Mitigating System cornerstone, and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding screened as of very low safety significance (Green) because it did not result in the loss of operability or functionality of mitigating systems. Specifically, the licensee evaluated the condition for operability and reasonably determined that installed non-safety related circuit protective devices would be expected to operate and protect the vital inverter during fault clearing conditions on the non-safety related loads powered by the inverter supplied CRID panel bus. The team did not identify a cross-cutting aspect associated with this finding because it was not reflective of current performance. |
| Site: | Cook  |
|---|---|
| Report | IR 05000315/2015008 Section 1R21 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21M |
| Inspectors (proximate) | A Dunlop B Parks C Baron C Lipa L Smith M Jeffers N Feliz-Adorno R Walton S Kobylarz |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Cook - IR 05000315/2015008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cook) @ 2015Q4
Self-Identified List (Cook)
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