05000528/FIN-2010005-04
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Finding | |
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Title | Failure to Promptly Correct a Conditions Adverse to Quality for the Essential Cooling Water Room Cooler |
Description | The inspectors identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for the failure of engineering personnel to promptly correct a condition adverse to quality associated with room cooler AHU-3MHAAZ05 blower shaft dimensions. Specifically, between July 2008 and November 2010, corrective actions for high vibrations in the Unit 3 essential cooling water system train A room cooler blower failed to promptly address the incorrect shaft dimensions at the bearing shaft interface. The licensee is developing corrective actions to replace the defective shaft by procuring a new shaft or machining a shaft on site. The licensee entered this issue into the corrective action program as Palo Verde Action Request 3559219. The inspectors concluded the finding was more than minor because it affected the equipment performance attribute of the Mitigating Systems cornerstone, and affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Using Manual Chapter 0609.04, Phase 1 Initial Screening and Characterization of Findings, the inspectors determined the finding had a very low safety significance (Green) because the finding did not result in a loss of system safety function, an actual loss of safety function of a single train for greater than its technical specification allowed outage time, or screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. The inspectors determined this finding had a crosscutting aspect in the area of human performance associated with the resources component because the licensee failed to ensure that personnel, equipment, and procedure were available and adequate to assure nuclear safety by minimizing long standing equipment issues H.2(a)(Section 1R15). |
Site: | Palo Verde ![]() |
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Report | IR 05000528/2010005 Section 1R15 |
Date counted | Dec 31, 2010 (2010Q4) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.15 |
Inspectors (proximate) | K Clayton R Lantz C Smith S Graves M Young J Mateychick B Larson J Bashore M Baquera B Rice T Buchanan D Reinert |
CCA | H.6, Design Margins |
INPO aspect | WP.2 |
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Finding - Palo Verde - IR 05000528/2010005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Palo Verde) @ 2010Q4
Self-Identified List (Palo Verde)
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