05000373/FIN-2013008-02
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Finding | |
|---|---|
| Title | Failure to Ensure Battery Margin Maintained for Station Blackout |
| Description | The inspectors identified a finding of very low safety significance (Green) and associated Non-Cited Violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the failure to ensure that 5 percent battery margin would be maintained for station blackout (SBO). Specifically, the capacity value used for an acceptance criterion by the battery test procedure did not ensure that battery capacity was sufficient to maintain the required 5 percent remaining battery margin through the next surveillance test. This finding was entered into the licensees Corrective Action Program. The licensee planned to revise their battery test procedure to ensure the required 5 percent margin would be maintained. The finding was determined to be more than minor because, if left uncorrected, it would become a more significant safety concern. Specifically, the battery performance test procedure criteria would not ensure that the batteries retained sufficient margin to support SBO loads through the next scheduled surveillance test. The finding screened as of very low safety significance (Green) because it did not result in loss of operability or functionality of mitigating systems. Specifically, the most recent test results showed that the capacity of the battery was sufficient to supply the calculated load demands under SBO conditions at the time of this inspection. The inspectors determined that this finding had a cross-cutting aspect in the area of problem identification and resolution, operating experience because the licensee did not properly evaluate relevant operating experience, i.e., NRC Information Notice 2013-05, Battery Expected Life and its Potential Impact on Surveillance Requirements. |
| Site: | LaSalle  |
|---|---|
| Report | IR 05000373/2013008 Section 1R21 |
| Date counted | Dec 31, 2013 (2013Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | I Hafeez J Corujo Sandin N Feliz Adorno R Langstaff A Dahbur A Della Grecab Jose D Reeser H Campbell |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
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Finding - LaSalle - IR 05000373/2013008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (LaSalle) @ 2013Q4
Self-Identified List (LaSalle)
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