05000285/FIN-2009006-01
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Finding | |
|---|---|
| Title | Inadequate Assessment of Seismic Qualification of Raw Water Pumps |
| Description | The team identified a Green, noncited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control. Specifically, from February 1992 to September 8, 2009,the licensee failed to adequately evaluate the seismic qualification of the raw water pumps to ensure that the pumps anchor bolts imbedded in the floor would meet Seismic Class I standards. The team determined that the February 1992 seismic analysis was not conservative for the following reasons:nThe weight distribution of the pump/motor assembly in the analysis did not correctly apply the center of gravity of the pump to the loading analysis;nthe stress analysis of the anchors did not include the weight of the water in the piping; the stress analysis did not include the nozzle loads applied to the pump due tothe weight of the discharge piping. The licensee entered the issue into their corrective action program as CR 2009-3977,and performed a preliminary operability evaluation of the support components which determined that the pumps would remain operable following a safe shutdown earthquake. The team reviewed the evaluation, and concurred with the operability evaluation. The finding is more than minor because it adversely affected the design control attribute of the Mitigating Systems Cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding was of very low safety significance (Green) because it was a design deficiency that did not result in actual loss of safety function. This finding was not assigned a crosscutting aspect because the underlying cause was not indicative of current performance |
| Site: | Fort Calhoun  |
|---|---|
| Report | IR 05000285/2009006 Section 1R21 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | D Loveless G George G Morris N Okonkwo P Goldberg S Hedger S Wong T Farnholtz W Sherbin |
| INPO aspect | |
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Finding - Fort Calhoun - IR 05000285/2009006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fort Calhoun) @ 2009Q4
Self-Identified List (Fort Calhoun)
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