05000397/FIN-2010006-01
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Finding | |
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| Title | Inadequate Assessment of Emergency Diesel Generator Air Filters During an Ashfall Event |
| Description | The team identified a noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, which requires, in part, measures shall be established to assure that applicable regulatory requirements and the design basis are correctly translated into specifications, drawings, procedures and instructions. Further required, in part, is that design control measures shall provide for verifying or checking the adequacy of design, such as by the performance of design reviews, by the use of alternate or simplified calculational methods, or by the performance of a suitable testing program. Contrary to the above, the licensee failed to establish measures to assure that applicable regulatory requirements and the design basis are correctly translated into specifications, drawings, procedures and instructions. Specifically, prior to June 5, 2010, the licensees measures established to assure that applicable regulatory requirements and the design basis, relative to the licensing basis duration for a volcanic ashfall generated loss of offsite power was not correctly translated into specifications, drawings, procedures and instructions. Also, the licensees design control measures failed to verify or check the adequacy of design for the potential effects of volcanic ashfall loading on emergency diesel generator intake pre-filters and combustion air and room ventilation outside air supply filters, by the use of alternate or simplified calculational methods, or by the performance of a suitable testing program. This finding was entered into the licensees corrective action program as condition reports 219289, 219342, 219362, 219363, 219364, 219365, 219388, and 219394. The team determined that failing to properly incorporate the licensing basis for an ashfall event and an inadequate design analysis of emergency diesel generator intake combustion air and room cooling air filter loading during an ashfall event was a performance deficiency. This finding was more than minor because it was associated with the design control attribute of the Mitigating Systems Cornerstone and affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The team performed a Phase 1 screening, in accordance with Inspection Manual Chapter 0609.04, \"Phase 1 - Initial Screening and Characterization of Findings,\" and determined that the finding was of very low safety significance (Green) because it was a design or qualification deficiency confirmed not to result in loss of operability or functionality. Specifically, the licensees revised calculation demonstrated that the emergency diesel generators would remain functional during the licensing basis ashfall generated two-hour duration loss of offsite power. This finding did not have a cross-cutting aspect because the most significant contributor did not reflect current licensee performance |
| Site: | Columbia  |
|---|---|
| Report | IR 05000397/2010006 Section 1R21 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | T Farnholtz W Sherbin M Young B Larson S Makor J Nicely |
| INPO aspect | |
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Finding - Columbia - IR 05000397/2010006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Columbia) @ 2010Q3
Self-Identified List (Columbia)
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