05000397/FIN-2013007-05
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Finding | |
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| Title | Failure to Provide Technical Basis for Assuming Turbulent Mixing of Diesel Combustion Air |
| Description | The team identified a Green non-cited violation of Title 10 CFR Part 50, Appendix B, Criterion III, Design Control, which states in part, that design control measures shall provide for verifying or checking the adequacy of design, such as by the performance of design reviews, by the use of alternate or simplified calculational methods, or by the performance of a suitable testing program. Specifically, from June 6, 1992, to August 20, 2013, the licensee failed to verify or check the adequacy of the design, by the use of alternate or simplified calculational methods, the technical basis that justified the dispersion of nitrogen in a tornado event to prevent loss of function of the emergency diesel generators. This violation was entered into the licensees corrective action program as Action Request 292322. The violation did not represent an immediate safety concern. The team determined that the failure to verify the adequacy of the technical basis that justified the dispersion of nitrogen in a tornado event was a performance deficiency. The performance deficiency was more than minor, and therefore a finding, because it was associated with the design control attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the functionality of the diesel generators was called into question for the failure to provide a technical basis for the effects of nitrogen leakage on the combustion air system. Using the Manual Chapter 0609, Appendix A, Exhibit 4, the inspectors determined a detailed risk evaluation was necessary because, during an external initiating event, the finding would degrade one or more trains of a system that supports a risk significant system or function; therefore, the senior reactor analyst performed a bounding detailed risk evaluation. The analyst determined that the change in core damage frequency was 1.2E-8 per year (Green). Since the change in core damage frequency was less than 1E-7 per year, the finding was not significant to the larger early release frequency. This finding did not have a crosscutting aspect because the most significant contributor to the performance deficiency did not reflect current licensee performance. |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2013007 Section 1R21 |
| Date counted | Sep 30, 2013 (2013Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | T Buchanan T Martinez Navedo W Smith G Replogle J Braisted M Yeminy S Kobylarz |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Columbia - IR 05000397/2013007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2013Q3
Self-Identified List (Columbia)
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