05000458/FIN-2011003-02
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | The licensee identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, for failure to prescribe an activity affecting quality by a procedure that was appropriate to the circumstances. Specifically, Procedure AOP-0050, Station Blackout, has an option to start the emergency diesel generators when no standby starting air is available. The licensee included instructions to attach nitrogen bottles to the starting air system and use nitrogen to air-start the emergency diesel generators. Those instructions were inappropriate because if only nitrogen was injected into the diesels cylinders, no oxygen would be available for combustion and the engine would not start. The licensee implemented corrective actions to revise the appropriate procedure step to use compressed air. The licensee addressed this issue in Condition Report CR-RBS-2011-03488. The finding was more than minor because it affected the equipment performance attribute of the Mitigating Systems Cornerstone and affected the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. As described in Inspection Manual Chapter 0609, the inspectors performed a Phase 1 significance determination process evaluation and determined that a Phase 2 evaluation was required because this finding represented an actual loss of safety function of a single train of equipment for greater than the technical specification allowed outage time. The inspectors performed a Phase 2 evaluation using the presolved significance determination process worksheets for River Bend Station and determined that this finding screened as Yellow. The senior reactor analyst performed a Phase 3 significance determination process evaluation and determined that the risk significance of the finding was very low because there was only a very small probability that the compressed nitrogen would need to be used for any given diesel start, such that the overall diesel failure probability was only negligibly higher than the baseline value. |
| Site: | River Bend  |
|---|---|
| Report | IR 05000458/2011003 Section 4OA7 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Latta P Elkmann A Barrett G Larkin V Gaddy |
| INPO aspect | |
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Finding - River Bend - IR 05000458/2011003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2011Q2
Self-Identified List (River Bend)
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