05000528/FIN-2008003-04
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Finding | |
|---|---|
| Title | Failure to Prevent Recurrence of a Significant Condition Adverse to Quality for the Feedwater Isolation Valves |
| Description | A self-revealing noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, \"Corrective Actions,\" was identified for the failure of engineering personnel to implement adequate corrective actions to preclude recurrence of a significant condition adverse to quality. Specifically, between June 28, 1998 and July 17, 2006, on several occasions, the four-way \'N\' valve for an economizer main feedwater isolation valve became lodged in the center blocked position, preventing fast closure of the main feedwater isolation valve upon receipt of a main steam isolation signal. This issue was entered into the licensee\'s corrective action program as Condition Report/Disposition Request 2915450. This finding is greater than minor because it is associated with the equipment performance attribute of the mitigating systems cornerstone and affects the cornerstone objective of ensuring the availability and reliability of systems that respond to initiating events to prevent undesirable consequences. A Phase 2 analysis was required because using Manual Chapter 0609.04, \"Phase 1 Initial Screening and Characterization of Findings,\" there was a loss of main feedwater isolation of a single train to Steam Generator 1 for greater than the Technical Specification allowed outage time. Using the Phase 2 worksheets associated with a steam generator tube rupture without steam generator isolation, the finding is determined to have very low safety significance since all remaining mitigation capability was available or recoverable. This finding was evaluated as not having a crosscutting aspect because the performance deficiency is not indicative of current performance (Section 4OA2) |
| Site: | Palo Verde  |
|---|---|
| Report | IR 05000528/2008003 Section 4OA2 |
| Date counted | Jun 30, 2008 (2008Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | G Apger G George G Miller J Adams J Bashore J Melfi J Razo L Ricketson M Catts M Hay P Elkmann R Treadway W Sifre |
| INPO aspect | |
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Finding - Palo Verde - IR 05000528/2008003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palo Verde) @ 2008Q2
Self-Identified List (Palo Verde)
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