05000305/FIN-2009005-05
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Finding | |
|---|---|
| Title | Evaluation to Support Seismic Classification Downgrade to the Fuel Transfer Carriage |
| Description | The inspectors identified a URI for the downgrade of the seismic qualification of the fuel transfer cart and the subsequent calculation to support removal of the seismic restraints. On September 19 and October 4, 2009, the fuel transfer cart stopped moving during testing and the transfer of irradiated fuel. The licensee modified the fuel transfer cart by removing seismic stability brackets to support core de-fueling activities. The inspectors reviewed this permanent plant modification to assess if the removal of the restraints was acceptable. The inspectors found that the licensee had performed an evaluation of seismic stability for the fuel transfer cart under engineering change notice ECN 3784-003. The inspectors noted that the contractors condition report, No. 2009-6596, indicated that the contractor recommended that a minimum of three restraint angles be maintained in place on the conveyor car. Contrary to the contractors recommendation, in ECN 3784-03, Attachment 2, Evaluation for Seismic Stability of the Fuel Transfer Cart Considering the Removal of the rail clips under ECN 3784-003, the licensee indicated that all of the restraints could be removed. The licensee\'s related evaluation indicated that the periods of vibration for the cart during a seismic event would not result in accelerations of more than 1.0 times the force of gravity (<1.0g) and concluded that the operation of the transfer cart was not affected by the removal of the seismic restraints. The inspectors noted that this evaluation was not a formal calculation and did not contain any frequency analysis or dampening values. The licensee indicated that the fuel transfer cart was non-seismic and did not require a formal calculation. The inspectors reviewed historical documents related to the seismic qualification of the cart and found a quality assurance typing change performed in September 2008, where the licensee had changed the classification from seismic category 1 to seismic category 3. The inspectors observed that the seismic qualification of the transfer cart may have been inappropriately changed and the calculation to support removal of the seismic restraints may be inadequate. The inspectors\' evaluations were ongoing at the conclusion of the inspection period and this issue is considered a URI pending completion of the inspectors review and evaluation to determine if there is a performance deficiency and violation (URI 05000305/2009005-05) |
| Site: | Kewaunee  |
|---|---|
| Report | IR 05000305/2009005 Section 1R18 |
| Date counted | Dec 31, 2009 (2009Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.18 |
| Inspectors (proximate) | D Mcneil R Ruiz J Cassidy T Bilik M Phalen M Garza D Chyu M Kunowski S Burton K Barclay J Bozga M Jonesm Munirr Daley G Hausman N Adorno E Sanchez-Santiago |
| INPO aspect | |
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Finding - Kewaunee - IR 05000305/2009005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Kewaunee) @ 2009Q4
Self-Identified List (Kewaunee)
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