05000482/FIN-2010004-02
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Failure to Correct Degraded Vital Switchgear Cooler Wiring |
| Description | The inspectors identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Conditions Adverse to Quality, involving Wolf Creeks failure to identify and correct degraded wiring in the train A vital switchgear air conditioning unit. On August 5, 2010, the SGK05A unit tripped when it blew a fuse. The cause of the blown fuse was found to be a wire that shorted to its terminal box, which is mounted to the compressor. A limited number of wires were replaced and the unit was returned to service. A work order to troubleshoot stated that all wires were inspected and the repair work order stated to inspect for additional damage. The inspectors questioned degraded cables in the terminal box that were not replaced. On August 26, 2010, Wolf Creek reinspected the wiring and found 15 wires that exceeded the 10 percent insulation loss acceptance criterion and 1 wire that exceeded 50 percent. Vibration of flex conduit was also found to be causing wire degradation. This issue is captured in Condition Reports 27564, 27209, 27218, 27231, and 27237. Wolf Creek has planned more thorough and frequent wiring inspections. The failure to identify and correct the condition adverse to quality of ensuring wiring insulation meets its acceptance criteria is a performance deficiency. The performance deficiency is more than minor, and therefore a finding, because it is associated with the equipment performance attribute of the Mitigating Systems Cornerstone and it affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events. The finding is determined to be of very low safety significance because it did not represent an actual loss of safety function, did not result in exceeding a Technical Specification allowed outage time, and did not affect external event initiators. The finding has a crosscutting aspect in the human performance area associated with the resources component. Specifically, the August 6 troubleshooting and repair work orders did not include instructions to inspect all potentially affected wiring with a specific method to assess insulation loss in order to repair all the damaged wires H.2(c) (Section 1R13) |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2010004 Section 1R13 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.13 |
| Inspectors (proximate) | G Guerra D Allen C Long C Peabody T Buchanan |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
| ' | |
Finding - Wolf Creek - IR 05000482/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Wolf Creek) @ 2010Q3
Self-Identified List (Wolf Creek)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||