05000458/FIN-2012002-05
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Finding | |
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Title | Inadequate Relief Valve Configuration Control Results in a Reactor Downpower |
Description | The inspectors identified a self-revealing finding for failing to maintain configuration control of the gland seal header relief valves bonnet vent port. The configuration control failure lead to a subsequent decrease in condenser vacuum requiring an unplanned power reduction to maintain adequate condenser vacuum margin. This finding has been entered into the licensees corrective action program as Condition Report CR-RBS-2012-00736. The failure to maintain configuration control of the glad seal header relief valve was a performance deficiency. The finding was determined to be more than minor because it was associated with the configuration control attribute of the initiating events cornerstone and affected the cornerstone objective to limit the likelihood of those events that upset plant stability and challenge critical safety functions. Specifically, the failure to maintain configuration control resulted in an unplanned down power. Using Inspection Manual Chapter IMC 0609, Significance Determination Process, Attachment 4, Phase 1 - Initial Screening and Characterization of Findings, the finding was determined to have very low safety significance (Green) because it did not contribute to both the likelihood of a reactor trip and the likelihood that mitigating systems will not be available. The inspectors determined that the apparent cause of this finding was that when the licensee prepared work orders that directed installation of the gland seal header relief valves, they did not comply with procedural requirements to provide plant configuration controls. Therefore, this finding has a cross-cutting aspect in the human performance area associated with the work practice component because the licensee did not define and effectively communicate expectations regarding procedural compliance |
Site: | River Bend |
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Report | IR 05000458/2012002 Section 1R19 |
Date counted | Mar 31, 2012 (2012Q1) |
Type: | Finding: Green |
cornerstone | Initiating Events |
Identified by: | Self-revealing |
Inspection Procedure: | IP 71111.19 |
Inspectors (proximate) | W Sifre R Hagar G Larkin V Gaddy S Makor D Reinert C Alldredge L Carson S Garchow A Barrett |
CCA | H.8, Procedure Adherence |
INPO aspect | WP.4 |
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Finding - River Bend - IR 05000458/2012002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (River Bend) @ 2012Q1
Self-Identified List (River Bend)
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