05000440/FIN-2017008-02
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Finding | |
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Title | Inadequate Evaluation of Emergency Closed Cooling System Pipe Support |
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 consider all stresses resulting from the emergency closed cooling system as built pipe support 1P42-H1080 connection details. Specifically, the evaluation for the pipe support did not address the impact of rigid connections at both ends of the W8 steel post and of the lateral load on W21 auxiliary steel beam. The licensee captured the issues in their CAP as CR-2017-08986 and CR-2017-09043, reasonably determined the support remained operable, and planned to revise the affected structural analyses.The performance deficiency was determined to be more-than-minor because it was associated with 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, the failure to analyze actual pipe configuration and to evaluate the W21 beam did not ensure the emergency closed cooling system and its safety-related supported loads would remain available and capable of providing their accident mitigating function. 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. The team determined that this finding had a cross-cutting aspect in the area of human performance because the licensee did not recognize and plan for the possibility of mistakes, latent issues, and inherent risk, even while expecting successful outcomes. Specifically, the licensee did not recognize this latent issue when revising the structural evaluation in 2015. |
Site: | Perry |
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Report | IR 05000440/2017008 Section 1R21 |
Date counted | Dec 31, 2017 (2017Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21M |
Inspectors (proximate) | N Adorno B Jose J Benjamin V Meghani W Hopf C Baron M Jeffers |
Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
CCA | H.12, Avoid Complacency |
INPO aspect | QA.4 |
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Finding - Perry - IR 05000440/2017008 | |||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Perry) @ 2017Q4
Self-Identified List (Perry)
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