05000528/FIN-2009004-01
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Finding | |
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| Title | Failure to Correct a Condition Adverse to Quality with the Emergency Diesel Generator Train A K-4 Relay in a Timely Manner |
| Description | The inspectors identified a noncited violation of 10 CFR Part 50,Appendix B, Criterion XVI, Corrective Action, for the failure of the licensee to promptly identify and correct a deficiency associated with the emergency diesel generator voltage regulator K-4 relay in a timely manner. Specifically, on October 16, 2004, maintenance personnel identified that the K-4 relay had a high resistance of approximately 800 ohms but did not replace the relay as required by procedures. This resulted in the failure of the emergency diesel generator to start following maintenance activities on May 7, 2009. This issue was entered into the licensees corrective action program as Palo Verde Action Request3385257.The finding is more than minor because it is associated with equipment performance attribute of the Mitigating Systems Cornerstone and affects the associated cornerstone objective to ensure the reliability and capability of systems that respond to initiating events. Using Manual Chapter 0609.04, Phase 1 Initial Screening and Characterization of Findings, the finding was determined to require a Phase 2 and Phase 3 analysis by a senior reactor analyst, because the finding resulted in an actual loss of safety function of a single train for greater than its technical specification allowed outage time. Based on the analysis performed, the analyst concluded that the finding had very low safety significance. This assessment was based on three failures of the K-4relay having occurred in approximately 170 starts and crediting seven hours for the station batteries during a loss of offsite power event resulting in a core damage frequency of 3.8E-7. This finding was evaluated as not having a crosscutting aspect because the performance deficiency is not indicative of current performance |
| Site: | Palo Verde  |
|---|---|
| Report | IR 05000528/2009004 Section 1R22 |
| Date counted | Sep 30, 2009 (2009Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.22 |
| Inspectors (proximate) | R Treadway J Melfi M Hay J Bashore M Catts |
| INPO aspect | |
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Finding - Palo Verde - IR 05000528/2009004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palo Verde) @ 2009Q3
Self-Identified List (Palo Verde)
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