05000346/FIN-2009007-03
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Finding | |
|---|---|
| Title | Non-Conservative Calculation of Induction Motor Load on AC Power System |
| Description | A finding of very low safety-significance and associated Non-Cited Violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified by the inspectors for the failure to evaluate worst case motor loads for emergency diesel generator and alternating current power system loading under postulated accident conditions. Specifically, the licensee did not use vendor guaranteed motor efficiency data in Calculation C-EE-015.03-008. As a result, motor efficiencies under postulated accident conditions were non-conservatively determined by the licensee for the high pressure injection, decay heat, and containment spray motors. This violation was entered into the licensees corrective action program. To demonstrate operability, the licensee performed additional analysis. The finding was determined to be more than minor because if left uncorrected, the failure to accurately determine loading upon the emergency diesel generators could result in overloading an emergency diesel generator due to the addition of loads. The inspectors determined that the finding was of very low safety-significance because the finding was a design or qualification deficiency confirmed to not result in a loss of operability or functionality. This finding has a cross-cutting aspect in the Resources component of Human Performance because the licensee did not ensure personnel and other resources were adequate to assure nuclear safety. H.2(b) |
| Site: | Davis Besse  |
|---|---|
| Report | IR 05000346/2009007 Section 1R21 |
| Date counted | Mar 31, 2010 (2010Q1) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | A Boland A Shaikh B Sherbin D Mas L Jones N Valos R Langstaff S Kobylarz |
| CCA | H.9, Training |
| INPO aspect | CL.4 |
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Finding - Davis Besse - IR 05000346/2009007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Davis Besse) @ 2010Q1
Self-Identified List (Davis Besse)
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