05000445/FIN-2013002-03
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Finding | |
|---|---|
| Title | Failure to Correct Diesel Frequency Degradation |
| Description | The inspectors identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion XVI, for the failure to preclude repetition of a significant condition adverse to quality. Specifically, the Unit 2 train B diesel generator failed to maintain 60 hertz during an isochronous test on April 9, 2011, which was a repeat of a significant condition adverse to quality identified in 2010. As a result, the capability of the diesel generator to supply emergency power was degraded. The licensee entered the finding in the corrective action program as Condition Report CR-2011-007683. The licensees failure to preclude repetition of the Unit 2 train B diesel generator frequency degradation, a significant condition adverse to quality, was a performance deficiency. The finding was more than minor because it was associated with the equipment performance attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective to ensure the capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the isochronous diesel frequency degraded from the nominal 60 hertz, which would cause powered equipment to slow down. Using NRC Manual Chapter 0609, Appendix A, The Significance Determination Process for Findings At-Power, the finding was determined to be of very low safety significance because the finding was not a design or qualification deficiency; did not represent an actual loss of safety function of a system or train; and did not result in the loss of one or more trains of non-technical specification trains of equipment. Although the diesel frequency was degraded, the diesel and all of its powered equipment remained capable of performing their safety functions. The finding had a problem identification and resolution cross-cutting aspect associated with the corrective action program, in that, the licensee failed to thoroughly evaluate problems such that the resolutions address causes and extent of conditions, as necessary. |
| Site: | Comanche Peak  |
|---|---|
| Report | IR 05000445/2013002 Section 4OA2 |
| Date counted | Mar 31, 2013 (2013Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | W Walker B Tindell C Osterholtz J Kramer N Hernandez D Strickland |
| Violation of: | 10 CFR 50 Appendix B Criterion XVI |
| CCA | P.2, Evaluation |
| INPO aspect | PI.2 |
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Finding - Comanche Peak - IR 05000445/2013002 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Comanche Peak) @ 2013Q1
Self-Identified List (Comanche Peak)
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