05000483/FIN-2010006-02
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Finding | |
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| Title | Failure to Correct Repetitive Failures in Steam Generator Atmospheric Dump Valves in a Timely Manner |
| Description | The team identified a green noncited violation of 10 CFR Part 50, Appendix B, Criterion XVI, involving the failure to promptly correct deficiencies affecting the steam generator atmospheric steam dump valves. In 2002, system engineers identified that the valves current-to-pressure transducers were experiencing degradation because they were subjected to high vibration, and a proposed modification to move the transducers to a low vibration area occurred in 2006. The licensee experienced several additional failures in 2009 and determined that the reliable life of the transducers was 18 months in the high vibration areas. As of the date of the inspection, only one transducer of the four had been moved to a low vibration location, and the team determined that corrective actions for this condition adverse to quality have not been timely. The licensee plans to implement modifications to relocate the remaining three transducers to a lower vibration environment in 2011. The issue was entered into the licensees corrective action program as Callaway Action Request 200910153. This issue was determined to be greater than minor because it impacted the Mitigating Systems Cornerstone attribute of human performance 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 found that even though the steam generator atmospheric steam dump valves were not able to meet their technical specification surveillance requirements of achieving the full open position the valves would open sufficiently to meet its intended safety function. Therefore, the issue was of very low safety significance since it was a design or qualification deficiency confirmed not to result in a loss of functionality. This finding has a crosscutting aspect in the area of human performance associated with the resources component because the licensee failed to maintain long term plant safety by minimization of long-standing equipment issues associated with steam generator atmospheric steam dump valve current-to-pressure transducers. |
| Site: | Callaway  |
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| Report | IR 05000483/2010006 Section 4OA2 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | P Goldberg M Hay J Groom J Rollins Z Hollcraft |
| CCA | H.6, Design Margins |
| INPO aspect | WP.2 |
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Finding - Callaway - IR 05000483/2010006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Callaway) @ 2010Q4
Self-Identified List (Callaway)
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