05000390/FIN-2008005-03
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Finding | |
|---|---|
| Title | Performing Non-Authorized Activities on Exciter Field Breaker Results in Reactor Trip |
| Description | A Green self-revealing finding was identified for the failure to obtain authorization prior to opening the main generator exciter field breaker compartment and operating the de-latching bar. The licensees procedures for controlling sensitive plant equipment specified that personnel obtain the Unit Supervisors authorization prior to beginning work on sensitive equipment. Operating the de-latching bar resulted in the exciter field breaker opening which resulted in the turbine generator and the reactor tripping. The licensee entered this issue into their corrective action program as Problem Evaluation Report 152955. The finding was more than minor because it was associated with the Human Performance attribute of the Initiating Events Cornerstone and adversely affected the cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions during at-power operations. This finding was evaluated using the Significance Determination Process Phase 1 screening criteria and was determined to be of very low safety significance because the finding did not contribute to both a reactor trip and the likelihood of mitigation equipment or functions not being available. The cause of the finding was directly related to the human performance and error prevention aspect of the cross-cutting area of Human Performance, in that, personnel failed to use the self-checking technique to stop and consider their actions for two minutes prior to proceeding with an activity (H.4.a). (Section 4OA3.3 |
| Site: | Watts Bar  |
|---|---|
| Report | IR 05000390/2008005 Section 4OA2 |
| Date counted | Dec 31, 2008 (2008Q4) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | R Monk R Rodriguez H Gepford L Miller R Aiello M Pribish C Peabody B Caballero |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - Watts Bar - IR 05000390/2008005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2008Q4
Self-Identified List (Watts Bar)
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