05000237/FIN-2010003-08
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Finding | |
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| Title | Potential Safety Significance of Free-Standing Stack Configuration during MPC Transfer from HI-TRAC Transfer Cask into HI-STORM Storage Cask |
| Description | As part of review of the licensees control of heavy loads associated with the design and installation of a physical restraint to the stack configuration during transfer activities of the MPC from the HI-TRAC transfer cask into the HI-STORM storage cask, the inspectors identified an unresolved item (URI) related to the potential safety significance of a free-standing stack configuration during a postulated design basis seismic event. Specifically, the licensee had utilized a free-standing stack configuration during prior dry fuel storage campaigns. During a weekly teleconference with the licensees Byron Station and the NRC on February 9, 2010, the NRC inspectors noted concerns with the seismic analysis of the proposed free-standing stack configuration during transfer activities of the MPC from HI-TRAC transfer cask into HI-STORM storage cask. Noting similarities in the analysis performed for the Dresden free-standing stack configuration, the licensee entered the concern into its corrective action program, AR 1028862, Questions Raised by NRC Regarding Cask Stackup, dated February 10, 2010. In addition, Exelon initiated AR 1031363, NRC Questions on Byron Specific Calculation, dated February 12, 2010. Corrective actions are being processed through Exelon AR 1031363 to ensure future safe handling of the cask. Based on final corrective actions, the safety significance of 50 Enclosure the historical use of a free-standing stack configuration may need to be addressed, as noted in AR 1028862. Pending NRC review of the licensees associated corrective actions, this concern will be tracked as an unresolved item (URI 05000237/2010003-08; 05000249/2010003-08). |
| Site: | Dresden  |
|---|---|
| Report | IR 05000237/2010003 Section 4OA5 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | URI: |
| cornerstone | Physical Protection |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Dunlop D Melendez-Colon W Slawinski C Phillips D Reeser B Palagi J Neurauter M Ring J Draper M Learn D Sand R Edwards R Jickling R Schulz J Tapp R Russella Bolandd Lords G Roach M Bielby M Learn M Porfirio M Ziolkowski T Go |
| INPO aspect | |
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Finding - Dresden - IR 05000237/2010003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Dresden) @ 2010Q2
Self-Identified List (Dresden)
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