05000364/FIN-2014005-02
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Finding | |
|---|---|
| Title | Failure to perform an adequate risk assessment led to a manual reactor trip of Unit 2 |
| Description | A self-revealing non-cited violation of 10 CFR 50.65, Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants, was identified for the licensees failure to properly assess the increase in risk that resulted from a planned maintenance outage of the 2B emergency diesel generator (EDG). As a result, a Unit 2 manual reactor trip was required when the 2B startup auxiliary transformer (SAT) deenergized. This finding was entered into the licensees CAP as CR 10019361. The failure to properly assess and manage the increase in risk was a performance deficiency. The performance deficiency was more than minor because it adversely affected the Configuration Control attribute of the Initiating Events cornerstone and adversely affected the cornerstone objective in that the risk associated with the component cooling water (CCW) system configuration in tandem with the 2B EDG maintenance outage was no
considered which contributed to a manual reactor trip. A detailed risk assessment determined that the incremental core damage probability risk deficit was < 1E-6/year and the incremental large early release probability risk deficit was < 1E-7/year. Therefore, the finding was determined to be of very low safety significance (Green). The inspectors determined the finding had a cross-cutting aspect of work management in the human performance area, because the risk associated with operating the B train of CCW as the on service train while the 2B DG was out of service for planned maintenance was not considered. [H.5] |
| Site: | Farley  |
|---|---|
| Report | IR 05000364/2014005 Section 4OA3 |
| Date counted | Dec 31, 2014 (2014Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | W Pursley A Vargas B Caballero C Dykes D Mas J Montgomery K Miller M Coursey M Franke P Niebaum R Kellner W Loo |
| Violation of: | 10 CFR 50.65 |
| CCA | H.5, Work Management |
| INPO aspect | WP.1 |
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Finding - Farley - IR 05000364/2014005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Farley) @ 2014Q4
Self-Identified List (Farley)
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