05000528/FIN-2009006-05
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Finding | |
|---|---|
| Title | Failure to Identify and Correct-Related Degradation of Safety-Related Inverters |
| Description | The inspectors identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for the licensees failure to promptly identify and correct a condition adverse to quality. Specifically, the licensee failed to incorporate industry and vendor recommended preventative maintenance requirements to prevent the age related degradation of safety-related inverter components. This finding was entered into the licensees corrective action program as Palo Verde Action Request 3291971.The inspectors determined that the failure to identify the necessary maintenance practices and take corrective actions prior to the 2008 inverter failures was a performance deficiency. This finding is more than minor because it affects the equipment performance attribute of the mitigating systems cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Using Inspection Manual Chapter 0609, Significance Determination Process, Phase 1 worksheets, the team determined that a Phase 2 analysis was required because the finding represented a loss of system safety function. A Phase 2/Phase 3 significance determination was performed by an NRC senior reactor analyst. Based on abounding analysis, the analyst determined that the delta core damage frequency result was less than 1.0E-7/yr. This noncited violation was therefore determined to be of very low safety significance. This finding has a crosscutting aspect in the problem identification and resolution component of operating experience, in that the licensee failed to implement operating experience through changes to station procedures (P.2b |
| Site: | Palo Verde  |
|---|---|
| Report | IR 05000528/2009006 Section 4OA2 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | N Taylor D Dumbacher R Rodriguez E Knutson R Walton D Proulx D Bollock M Catts E Ruesch A Vegel H Freeman |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - Palo Verde - IR 05000528/2009006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palo Verde) @ 2009Q1
Self-Identified List (Palo Verde)
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