05000482/FIN-2008002-10
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Finding | |
|---|---|
| Title | Failure to analyze motor-operated valve circuits. |
| Description | The inspectors identified a noncited violation of License Condition 2.c(5) because the licensee failed to evaluate the impact of a motor-operated valve failure mechanism on their ability to implement postfire safe shutdown following a control room evacuation. The licensee determined that the failure mechanism affected 38 motor-operated valves and upon valve failure could affect their ability to implement their postfire safe shutdown procedure. A short circuit that bypassed the torque and/or limit switches could damage the valves and prevent repositioning of the valve in the postfire safe shutdown position. The inspectors determined this was a performance deficiency because the licensee failed to ensure that components necessary to safely shutdown the reactor would remain operable following a fire. This deficiency was more than minor, in that, it had the potential to impact the mitigating systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to external events (such as fire) to prevent undesirable consequences. In addition to the control room fire requiring operators to evacuate the control room, the fire would have had to affect components located in five different control panels. The Phase 3 risk evaluation performed by the NRC senior reactor analyst determined this deficiency had very low risk significance (Section 4OA5.2) |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2008002 Section 4OA5 |
| Date counted | Mar 31, 2008 (2008Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Long D Stearns G Pick S Cochrum V Gaddy |
| INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2008002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2008Q1
Self-Identified List (Wolf Creek)
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