05000528/FIN-2011005-05
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Title 10 CFR Part 50, Appendix B, Criteria V, Instructions, Procedures, and Drawings, requires, in part, that activities affecting quality shall be prescribed by documented instructions, procedures, or drawings of a type appropriate to the circumstances. Contrary to this requirement, on November 30, 2011, plant personnel concluded that the station failed to provide documented instructions to ensure the locking collar for the range potentiometer on the automatic voltage regulator of emergency diesel generator 2B is tightened to prevent misalignment and failed to prescribe preventive maintenance instructions for the remote gate firing modules of the diesel generator. As a result, on July 6, 2011, Unit 2 emergency diesel generator B failed its routine surveillance test due to output voltage fluctuations. The licensee replaced the automatic voltage regulator and remote gate firing module and successfully retested the emergency diesel generator. The licensee entered the issue into the corrective action program as Condition Report Disposition Request 3804270 and has not completed all corrective actions associated with this issue. The inspectors concluded the finding is of very low safety significance and was not greater than Green based on the results of a risk assessment performed by a Region IV senior reactor analyst that concluded the delta-CDF was less than 1E-6. |
| Site: | Palo Verde  |
|---|---|
| Report | IR 05000528/2011005 Section 4OA7 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | L Ricketson G Guerra R Lantz M Brown B Baca D Allen J Melfi B Parks A Fairbanks E Uribe M Baquera D Reinert S Hedger |
| INPO aspect | |
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Finding - Palo Verde - IR 05000528/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palo Verde) @ 2011Q4
Self-Identified List (Palo Verde)
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