05000315/FIN-2009003-02
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Finding | |
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| Title | Maintenance Rule On-line Risk Assessment Inaccurate |
| Description | The inspectors identified one finding of very low safety significance with an associated Non-Cited Violation of 10 CFR 50.65, Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants, during planned maintenance on the 69 kilovolt emergency power system on June 2, 2009. Specifically, the on-line maintenance risk assessment for the planned maintenance failed to include the risk-significant supplemental emergency diesel generators. Consequently, the increase in risk for the planned work was underestimated. As an immediate corrective action licensee personnel re-performed the risk assessment to verify that the risk status remained green; that no risk management actions were required; and that a condition of significant risk was not missed due to the error. Other corrective actions included sending a generic communication to operations and work control personnel to make them aware of the issue and to ensure that they understood how the supplemental diesel generators were represented in the on-line risk program so that plant risk would be appropriately assessed during future emergency power system maintenance. This issue was entered into the licensees corrective action program as condition report AR 00852616. This finding was more than minor because the licensees on-line risk assessment for the 69 kilovolt emergency power system planned maintenance failed to include the risk-significant supplemental diesel generators, which were unavailable during the maintenance. This finding was of very low safety significance because the incremental core damage probability and the incremental large early release probability risk deficit values were less than 1.0E-6 after the risk assessment was recalculated to include the supplemental diesel generators. This finding was associated with a cross-cutting aspect in the area of human performance regarding work practiceshuman error prevention techniques (H.4 (a)) |
| Site: | Cook  |
|---|---|
| Report | IR 05000315/2009003 Section 1R13 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | NCV: Green |
| cornerstone | Miscellaneous |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | J Jacobson M Phalen J Lennartz P Laflamme J Cameron W Jessup |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Cook - IR 05000315/2009003 | |||||||||||||||||||||||||||||||||
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Finding List (Cook) @ 2009Q2
Self-Identified List (Cook)
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