05000461/FIN-2017002-03
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Finding | |
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| Title | Unexpected Start of the Division 3 Emergency Diesel Generato |
| Description | Green . The inspectors documented a self -revealed finding o f very low safety significance and an associated non- cited violation of Title 10 of the Code of Federal Regulations (CFR) Part 50, Appendix B, Criterion V, Instructions, Procedures, and Drawings, for the licensees failure to follow steps in Work Order (WO) 04640788 while performing troubleshooting on blown power transformer fuses in the division 3 emergency diesel start circuitry. Specifically, the electricians opened test switches in the wrong electrical cubicle resulting in the unexpected start of the division 3 emergency diesel generator and a loss of power to the 1C1 bus from an offsite source. The licensee entered this issue into their corrective action program (CAP) as Action Request (AR ) 04012393. As corrective actions, the licensee performed a human performance review to identify the reasons the procedure was not followed and restored power to the 1C1 safety bus . The performance deficiency was determined to be more than minor because it impacted the Initiating Event s cornerstone at tribute of human performance and adversely affected the cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the failure of the electrical maintenance technicians to follow their procedures resulted in a loss of power to the 1C1 electrical bus. T he finding was screened against the Initiating Event s cornerstone and determined to be of very low safety significance because the loss of power to the 1C1 bus occurred while Clinton was in a refueling outage when the high pressure core spray system was removed from service and not being relied upon for shutdown safety defense in depth. The loss of the 1C1 bus did not affect decay heat removal from the core, did not affect reactor coolant inventory, and the event occurred while the refuel cavity was flooded up for refueling operations. The inspectors determined that this finding affected the cross -cutting area of human performance in the aspect of avoid complacency where individuals implement 3 appropriate error reduction tools. Specifically, as documented in the licensees human performance review, the electricians performing the work did not utilize any human performance tools to flag the equipment to be operated and improperly performed the concurrent verification of the component to be manipulated. [H.12] |
| Site: | Clinton  |
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| Report | IR 05000461/2017002 Section 1R20 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | W Schaup E Sanchez-Santiago M Doyle S Bell G Edwards V Meghani L Torres S Mischke K Stoedter |
| Violation of: | 10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion V |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Clinton - IR 05000461/2017002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Clinton) @ 2017Q2
Self-Identified List (Clinton)
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