05000482/FIN-2009002-07
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Finding | |
|---|---|
| Title | Failure to correct component cooling water valve closures |
| Description | The inspectors identified a cited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Conditions Adverse to Quality, involving Wolf Creeks failure to correct the cause of the reactor coolant pump thermal barrier component cooling water heat exchanger outlet valves stroking closed on high flow. Specifically, between 2001 and 2009, Wolf Creek experienced repeated cases of the reactor coolant pump thermal barrier component cooling water heat exchanger outlet valves stroking closed during component cooling water pump swaps and during isolations of the radioactive waste evaporators. Wolf Creek reinitiated evaluation of the issue after the inspectors questions but did not review the impact on the operators ability to open the valves given the valves circuit breakers opening. Repeated throttle valve adjustments have not been successful in stopping the valve closures. Wolf Creek has corrective action pending to modify valve circuitry but it has not been implemented. This issue is being tracked by the licensee as Condition Report 2009-02074. The failure to correct a condition adverse to quality of ensuring reactor coolant pump seal cooling as described in the Updated Safety Analysis Report is a performance deficiency. The finding is more than minor because it is associated with the equipment performance attribute for the Initiating Events Cornerstone; and, it 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. The finding was determined to be of very low safety significance because the finding would not result in exceeding the Technical Specification limit for identified reactor coolant system leakage and would not have affected other mitigation systems resulting in a total loss of the seal cooling safety function. This finding is being cited because the licensee failed to establish measures to assure this condition adverse to quality was promptly identified and corrected. This finding has a crosscutting aspect in the area of human performance associated with the decision making component because, even though numerous instances of valve closures occurred since the first noncited violation, Wolf Creek downgraded the condition report. Using nonconservative assumptions, the licensee consistently viewed this issue as not having a risk impact because seal injection was not simultaneously lost [H.1 ( b)] (Section 4OA2) |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2009002 Section 4OA2 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | Violation: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | B Tindell C Long M Hayes P Elkmann P Jayroe V Gaddyc Longc Osterholtz C Peabody J Laughlin N O'Keefe S Hedger T Buchanan |
| CCA | H.14, Conservative Bias |
| INPO aspect | DM.2 |
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Finding - Wolf Creek - IR 05000482/2009002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2009Q1
Self-Identified List (Wolf Creek)
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