05000315/FIN-2015008-04
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Finding | |
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Title | Failure to Consider All Design Basis CCW Passive Failures |
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 that the component cooling water (CCW) design was capable of accepting a passive failure as described in the Updated Final Safety Analysis Report (UFSAR). Specifically, the passive failure definition described in the UFSAR was more limiting than the licensee postulated passive failure. The licensee entered this issue into their CAP as AR 2015-15073 with a proposed plan to reconcile the differences between the design basis and plant documentation. 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 represent a loss of function, an actual loss of function of a single TS train or two separate TS safety systems, or an actual loss of function of one or more non-TS trains. Specifically, the licensee performed a historical review of CCW isolation valve leakage and reasonably determined that actual leakage values would have reasonably allowed sufficient response time to provide system makeup to the redundant train. In addition, the licensee performed a historical review of CCW passive failures and did not find an actual loss of function due to a passive failure. The team did not identify a cross-cutting aspect associated with this finding because it was an original design issue; therefore, it was not reflective of current performance. |
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 Technical Specification |
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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