05000315/FIN-2015008-07
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Finding | |
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Title | Failure to Verify the Station's Capability to Isolate Postulated CCW System Out-Leakagge |
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 CCW design capability to isolate a postulated CCW system out-leakage. Specifically, the CCW isolation valves were not periodically leak tested, and the system design and plant procedures did not include safety related and/or seismic-qualified makeup capabilities. The licensee entered this issue into their CAP as AR 2015-14961, and established temporary procedures and pre-staged equipment to quickly provide system makeup from alternate sources. The performance deficiency was more than minor because it was associated with the design control attribute of the Mitigating Systems 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 performed a historical review of isolation valve leakage and reasonably determined that actual leakage values would have reasonably allowed sufficient response time to provide system makeup. The team did not identify a cross-cutting aspect associated with this finding because it was not confirmed to reflect current performance due to the age of the performance deficiency. |
Site: | Cook ![]() |
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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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