05000482/FIN-2009002-05
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Finding | |
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| Title | |
| Description | An unresolved item was identified when Wolf Creek entered Technical Specification 3.8.1 on January 4, 2009, when an operator identified one missing and one loose screw in the Emergency Diesel Generator A overspeed limit switch. A reportability determination dated February 19, 2009, determined that the condition was not reportable, although Wolf Creek stated that the configuration was not seismically qualified and inoperable. Wolf Creek concluded per NUREG 1022 that because there was not firm evidence that screws did not fall out of the limit switch bracket immediately before discovery by an operator, that the issue was not reportable under 10 CFR 50.73(a)(2)(i)(B). The inspectors questioned this reportability evaluation and requested support from the Office of Nuclear Reactor Regulations Division of Operating Reactor Oversight and Licensing. The inspectors found that the last time that maintenance was performed on this limit switch was 2002. At the completion of the inspection period, there were still unresolved questions about the assumptions and results associated with the evaluation of the limit switch, its impact of failure on Emergency Diesel Generator A, operator response actions, and this issues reportability. These concerns require additional inspection and, when completed, the inspection results will require significance determination. This issue is considered unresolved pending additional NRC review of Wolf Creek operability determination calculations: URI 05000482/2009002-05, seismic operability of Emergency Diesel Generator A due to overspeed limit switch degradation |
| Site: | Wolf Creek  |
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| Report | IR 05000482/2009002 Section 1R15 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | B Tindell C Long M Hayes P Elkmann P Jayroe V Gaddyg Guerrab Tharakan B Tindell C Long V Gaddy C Peabody P Jayroe |
| INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2009002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2009Q1
Self-Identified List (Wolf Creek)
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