05000445/FIN-2010002-01
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Finding | |
|---|---|
| Title | Mispositioned Instrument Card Setting Causes Pressurizer Power Operated Relief Valve to Open |
| Description | The inspectors reviewed a self-revealing noncited violation of Technical Specification 5.4.1.a for the failure of maintenance personnel to follow procedural requirements for reinstalling a pressurizer pressure control card. As a result, when operators raised reactor coolant pressure to normal operating pressure at the end of the refueling outage, a pressurizer power operated relief valve opened due to a mispositioned gain setting on the control card. The licensee entered the finding into the corrective action program as condition report CR-2009-006665. The finding was more than minor because it was associated with the human performance attribute of the initiating events cornerstone and affects the cornerstone objective to limit those events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the inadvertent lifts of the power operated relief valves could lead to a loss of reactor coolant system inventory and pressure control. Using NRC Manual Chapter 0609, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, the finding was determined to require a Phase 2 analysis. For a bounding analysis, the inspectors used the Phase 2 pre-solved table section for one power operated relief valve that fails to close for 3 to 30 days, and determined that the finding was of very low safety significance. The finding has a human performance crosscutting aspect associated with work practices because the licensee did not provide appropriate oversight of contractor personnel performing the maintenance activity of installing the instrument control card H.4c |
| Site: | Comanche Peak  |
|---|---|
| Report | IR 05000445/2010002 Section 1R19 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | G Guerra W Walker B Tindell B Larson J Kramer |
| CCA | H.2, Field Presence |
| INPO aspect | LA.2 |
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Finding - Comanche Peak - IR 05000445/2010002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Comanche Peak) @ 2010Q1
Self-Identified List (Comanche Peak)
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