05000482/FIN-2011005-04
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Finding | |
|---|---|
| Title | Inadequate Evaluation of Effects of Emergency Diesel Generator Frequency Variation on Supplied Equipment |
| Description | The inspectors identified a Green non-cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to adequately evaluate the effects of allowed technical specification frequency variations on plant equipment in design calculations. Specifically, significant effects on the Class 1E electrical equipment air conditioning units were observed which required licensee action. The reduced cooling capacity raised temperatures above the allowable limits for equipment in those rooms. This finding was entered into the licensees corrective action program as condition report 2007-002734, for which the licensee performed a comprehensive analysis of the effects of frequency variation on safety-related equipment. Failure to adequately analyze the effects of allowable frequency variations on equipment performance was a performance deficiency. This finding is more than minor because it was associated with the design control attribute of the Mitigating Systems Cornerstone and it affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. In accordance with Inspection Manual Chapter 0609.04, this finding was determined to be of very low safety significance (Green) because it did not create a loss of safety system function of a single train for greater than the technical specification allowed outage times, and did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. This finding did not have a cross-cutting aspect because the most significant contributing cause did not reflect current licensee performance |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2011005 Section 4OA2 |
| Date counted | Dec 31, 2011 (2011Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | R Deese G Guerra P Elkmann L Willoughby N O'Keefe C Long C Peabody C Steely D Strickland N Makris |
| INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2011005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2011Q4
Self-Identified List (Wolf Creek)
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