05000458/FIN-2008003-01
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Finding | |
|---|---|
| Title | Inadequate Risk Assessment for Removing Control Building Chilled Water System from Service |
| Description | The inspectors identified a noncited violation of 10 CFR 50.65(a)(4) when operators failed to perform an adequate risk assessment while the Division 1 control building chilled water and control building air conditioning systems were unavailable. Specifically, the inspectors identified that licensee personnel nonconservatively evaluated the on-line risk as Green instead of Yellow. This resulted in an unrecognized increase in the level of risk as determined by Entergys probabilistic safety analysis evaluation. The licensee entered this issue into their corrective action program as Condition Report RBS-2008-2687. Using NRC Manual Chapter 0612, Appendix E, Section 3, Item 7(e), the finding is more than minor because the licensees risk assessment had errors and incorrect assumptions that put the plant in a higher risk category. Using Manual Chapter 0609, Significance Determination Process, Appendix K, Maintenance Risk Assessment and Risk Management Significance Determination Process, the finding is determined to have very low safety significance (Green) because the incremental core damage probability deficit for the affected period is less than 1.0E-6. This finding has a crosscutting aspect in the area of problem identification and resolution component of operating experience because Entergy did not systematically communicate to affected internal stakeholders in a timely manner relevant internal operating experience P.2(a) (Section 1R13) |
| Site: | River Bend  |
|---|---|
| Report | IR 05000458/2008003 Section 1R13 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | P Goldberg B Baca P Elkmann G Miller B Tindell G Larkin C Norton |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - River Bend - IR 05000458/2008003 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2008Q2
Self-Identified List (River Bend)
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