05000440/FIN-2016002-02
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Title 10 of the CFR, Part 50.65(a)(4) states, in part, Before performing maintenance activities (including but not limited to surveillance, post-maintenance testing, and corrective and preventive maintenance), the licensee shall assess and manage the increase in risk that may result from the proposed maintenance activities. Contrary to the above, the licensee identified that it failed to perform the required risk assessment prior to commencing maintenance activities. Specifically, on April 28, 2016, the licensee racked out the L1006 breaker, which was the alternate supply to bus L11 from the Unit 1 startup transformer. The At-The-Controls licensed reactor operator then questioned whether or not an availability log entry was required for this breaker being racked to the disconnect position. At that time, the unit supervisor ran the probabilistic risk assessment (PRA) program for the L1006 breaker being racked to the disconnect position with the plant in its current configuration. The result of the PRA resulted in an increase in risk from Green Risk to Yellow Risk. The Unit Supervisor stopped the evolution and directed the breaker to be racked back in. After an evaluation of the schedule was performed and permission was received from the general plant manager to continue with the plant in Yellow PRA Risk, breaker L1006 was racked out and preventive maintenance proceeded. The finding was determined to be of very low safety significance because the risk deficit incremental core damage probability risk assessment increase of 6.6E10 was less than the 1E6 threshold. The licensee initiated CR201606093 to address this issue. |
| Site: | Perry  |
|---|---|
| Report | IR 05000440/2016002 Section 4OA7 |
| Date counted | Jun 30, 2016 (2016Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | B Dickson J Nance M Marshfield R Ng S Bell |
| Violation of: | 10 CFR 50.65 10 CFR 50.65(a)(4) |
| INPO aspect | |
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Finding - Perry - IR 05000440/2016002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Perry) @ 2016Q2
Self-Identified List (Perry)
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