05000397/FIN-2013007-01
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Finding | |
|---|---|
| Title | Failure to Support the Ability to Restore Class 1E Diesel Generator Standby Power and Recover from Station Blackout (SBO) Conditions |
| Description | The team identified a Green non-cited violation of 10 CFR 50.63, Loss of All Alternating Current Power, which states, in part, that each light-water-cooled nuclear power plant licensed to operate under this part must be able to withstand for a specified duration and recover from a station blackout as defined in 50.2. Specifically, from June 8, 2013, to August 6, 2013, the licensee failed to demonstrate the ability to restore alternating current power and recover from a station blackout event when the licensee determined that the station battery voltage would be below the vendor minimum rated voltage to operate the diesel generator output breaker close coil. This violation was entered into the licensees corrective action program as Action Request 291162. Subsequently, the licensee tested a spare 4160 Vac breaker, similar to the diesel generator output breaker, to provide reasonable assurance that the diesel generator breaker would close after the 4-hour coping period. The test results determined that the breaker would close reliably with less than the manufacturers rated voltage and within the capability of the battery. The team determined that the failure to demonstrate the ability to restore emergency alternating current power to recover from a station blackout in accordance with 10 CFR 50.63 was a performance deficiency. The performance deficiency was more than minor, and therefore a finding, because it was associated with the equipment performance attribute of the Mitigating Systems cornerstone and adversely affected cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the finding represented a reasonable question of functionality of the use of emergency diesel generators to recover from a station blackout. Using the NRC Manual Chapter 0609, Appendix A, Exhibit 2, the team determined the finding was of very low safety significance (Green), because the finding was confirmed to be a qualification deficiency that did not affect the functionality of the emergency diesel generators. The team determined that this finding had a cross-cutting aspect in the area of problem identification and resolution, corrective action program component, because the licensee failed to implement a corrective action program with a low threshold for identifying issues. |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2013007 Section 1R21 |
| Date counted | Sep 30, 2013 (2013Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | T Buchanan T Martinez Navedo W Smith G Replogle J Braisted M Yeminy S Kobylarz |
| Violation of: | 10 CFR 50.63 |
| CCA | P.1, Identification |
| INPO aspect | PI.1 |
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Finding - Columbia - IR 05000397/2013007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2013Q3
Self-Identified List (Columbia)
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