05000269/FIN-2015004-03
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | 10 CFR 50, Appendix B, Criteria III, Design Controls, requires in part, that measures shall be established to assure that applicable regulatory requirements and the design basis, as defined in 10 CFR 50.2 and as specified in the license application, for those structures, systems, and components to which this appendix applies are correctly translated into specifications, drawings, procedures and instructions. Contrary to the above, since May 11, 1992, the licensee failed to ensure that applicable regulatory requirements and design basis were correctly translated into specifications, drawings, procedures and instructions for the SSF. Specifically, the licensees initial analytical assumptions were inadequate to demonstrate that the SSF could meet design requirements under all required operating conditions. Additionally, on multiple occasions the licensee failed to properly evaluate emergent issues and design changes to ensure the SSF continued to meet design requirements under all required operating conditions. The performance deficiency was more than minor because it was associated with the equipment performance and protection against external factors attributes of the mitigating systems cornerstone and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. An NRC Region II senior reactor analyst evaluated both internal events and external events (e.g. fire, turbine building flooding, tornado) and determined the risk significance was very low (Green). The dominant contributors to the low risk result were: 1) the limited exposure time per year that an individual Oconee unit would spend in the vulnerable time-window immediately following shutdown, and 2) the low frequency of the external events that would demand the SSF. The licensee entered this condition into their CAP as NCR 01905088 and NCR 01905183. |
| Site: | Oconee  |
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| Report | IR 05000269/2015004 Section 4OA7 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Nielsen C Dykes C Fontana E Crowe F Ehrhardt G Croon J Rivera M Coursey M Meeks N Childs S Sanchez |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Oconee - IR 05000269/2015004 | |||||||||||||||||||||||||||||||||||
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Finding List (Oconee) @ 2015Q4
Self-Identified List (Oconee)
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