05000275/FIN-2014003-02
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Finding | |
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| Title | Inadequate Design Control with Respect to Seismic Induced System Interaction of Safety Related Components |
| Description | The inspectors identified a Green non-cited violation of 10 CFR, Part 50, Appendix B, Criterion III, Design Control, involving the licensees failure to verify the adequacy of their design with respect to seismic induced system interaction of safety related components. Specifically, PG&E did not verify the adequacy of interference limitations on structural components associated with the safety-related component cooling water heat exchanger. The licensee entered the finding in the corrective action program as Condition Report 50612919. The licensees failure to verify the adequacy of their design with respect to seismic induced system interaction of safety related components was a performance deficiency. This performance deficiency is more than minor, and is therefore a finding because the finding was associated with the Mitigating Systems Cornerstone attribute of design control and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of the component cooling water system to respond to initiating events to prevent undesirable consequences. Specifically, the original plant design configuration associated with seismic interference clearances for Unit 1 component cooling water heat exchanger components was not adequately controlled to ensure design piping stresses would not be challenged. Using Inspection Manual Chapter 0609, Attachment 04, Initial Characterization of Findings, and Appendix A, Exhibit 2, Mitigating System Screening Questions, the finding was determined to be of very low safety significance (Green) because the finding was associated with seismic design or qualification of systems, structures, and components but did not result in the loss of a system operability or functionality. This finding did not have a cross-cutting aspect because the most significant contributor did not reflect current licensee performance. (Section 1R04) |
| Site: | Diablo Canyon  |
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| Report | IR 05000275/2014003 Section 1R04 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.04 |
| Inspectors (proximate) | G Guerra G Pick J Buchanan J Reynoso J Watkins P Elkman R Latta T Hipschman W Sifre W Walker |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Diablo Canyon - IR 05000275/2014003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2014Q2
Self-Identified List (Diablo Canyon)
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