05000298/FIN-2010003-04
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Finding | |
|---|---|
| Title | Failure to Perform Required Maintenance Causes Unplanned Down Power |
| Description | A self-revealing finding was identified for the licensees failure to implement the preventive maintenance requirements of the vendor manual for the plant traveling water screens. Specifically, Vendor Manual 140, Traveling Water Screen, Revision 35, contained daily and weekly routine maintenance requirements to open the channel-flushing valve to clear any accumulated debris from the screens. Despite the fact that the licensee incorporated this vendor manual into their preventive maintenance system, this maintenance requirement was overlooked. The failure to perform this maintenance task led to the trip of the A1 and A2 traveling water screens on May 1, 2010, and required an emergent power reduction. The licensee entered this issue in their corrective action program as Condition Report CR-CNS-2010-03195, and implemented daily checks of the traveling water screens and daily flushing of the screen debris troughs
The finding was more than minor because it affected the equipment 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 shutdown as well as power operations. This finding was characterized under the significance determination process as having very low safety significance because it did not contribute to both the likelihood of a reactor trip and the likelihood that mitigation functions would be unavailable. The inspectors determined that no crosscutting aspect was applicable to this finding because the performance deficiency was not reflective of current performance (Section 4OA5). |
| Site: | Cooper  |
|---|---|
| Report | IR 05000298/2010003 Section 4OA5 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | |
| Inspectors (proximate) | N Taylor R Hagar V Gaddy M Chambers R Kumana |
| INPO aspect | |
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Finding - Cooper - IR 05000298/2010003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cooper) @ 2010Q2
Self-Identified List (Cooper)
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