05000306/FIN-2010009-01
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Finding | |
|---|---|
| Title | Failure to Design Diesels to Survive Tornado Borne Missiles |
| Description | The inspectors identified an NCV of 10 CFR 50, Appendix B, Criterion III, Design Control. Specifically, the licensee failed to design the D1/D2 diesel generators to survive impact from the design basis missiles. 10 CFR 50, Appendix B, Criterion III states, in part, that Measures shall be established to assure that applicable regulatory requirements and the design basis...for those systems, structures, and components to which this appendix applies are correctly translated into specifications, drawings, procedures, and instructions. Contrary to this requirement, on July 28, 1994, the licensee approved a calculation that used evaluation methodologies that were not included in the license for the facility. The licensee evaluated the condition and concluded D1/D2 remained operable but non-conforming. The inspectors determined that the failure to design the facility to withstand the impact of the design basis missile was a performance deficiency that warranted a significance evaluation. Using IMC 0612, the inspectors determined the failure to design the D1/D2 diesel to survive an impact from the design basis missile was more than minor because it is associated with the Mitigating Systems Cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events. The inspectors consulted with the Senior Reactor Analyst (SRA) and determined that the risk associated with the condition was green. No cross-cutting aspect was assigned because the performance deficiency from 1994 was not representative of current performance. |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000306/2010009 Section 4OA4 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 95001 |
| Inspectors (proximate) | J Ellegood D Betancourt S West |
| INPO aspect | |
| ' | |
Finding - Prairie Island - IR 05000306/2010009 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2010Q3
Self-Identified List (Prairie Island)
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