05000445/FIN-2011003-07
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Finding | |
|---|---|
| Title | Failure to Follow Maintenance Instructions Causes Inadvertent Valve Closure |
| Description | The inspectors reviewed a self-revealing finding for the licensees failure to follow maintenance instructions and properly reassemble a heater drain valve. As a result, the valve unexpectedly closed causing operators to manually initiate a turbine runback. This finding does not involve enforcement action because no regulatory requirement violation was identified. The licensee entered the finding into the corrective action program as Condition Report CR-2011-002716. The licensees failure to follow instructions and properly reassemble a heater drain valve, which resulted in the valve unexpectedly closing, was a performance deficiency. The finding was more than minor because it was associated with the equipment performance attribute of the initiating events cornerstone and adversely affected the cornerstone objective, in that, it increased the likelihood of those events that upset plant stability and challenge critical safety functions during power operations. Using NRC Manual Chapter 0609, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, the finding was determined to be of very low safety significance because the finding did not contribute to both the likelihood of a reactor trip and the likelihood that mitigating equipment would not be available. The finding has a human performance crosscutting aspect associated with resources, in that, the licensee failed to ensure that an adequate work package and instructions were available for a maintenance activity. |
| Site: | Comanche Peak  |
|---|---|
| Report | IR 05000445/2011003 Section 4OA3 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | Finding: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | B Tindell D Proulx G Tutak J Kramer R Kopriva W Walker |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Comanche Peak - IR 05000445/2011003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Comanche Peak) @ 2011Q2
Self-Identified List (Comanche Peak)
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