05000341/FIN-2011003-03
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Finding | |
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| Title | Methodology Used in the HI-STORM/HI-TRAC Stack-up and Evaluation May Be Inadequate |
| Description | A URI was identified by the inspectors regarding regulatory requirements and acceptable analytical methods to demonstrate seismic adequacy during vertical transfer of the MPC from the HI-TRAC to the HI-STORM during a postulated design basis earthquake event. Specifically, the inspectors identified a number of concerns pertaining to the licensees calculation performed to demonstrate that a free-standing configuration during vertical transfer of the MPC will not tip-over or excessively slide during a postulated design basis seismic event. Calculation SS-0003-2, Volume I, DCD 1, Rx/Aux. Bldg-Final Load Verif. Phase 2, First Floor Truck Bay Area (HI 2084016, Slab S-1, Beams 1B12, 1B2), Revision 0, evaluated the adequacy of a free-standing structural configuration during vertical transfer of the MPC from the HI-TRAC to the HI-STORM. The transfer includes the HI-TRAC placed on top of the HI-STORM with a mating device interposed between the two. All three components are placed on top of a trolley (low profile transporter) that can move along rails on the floor of the reactor building. A seismic analysis of the configuration was performed by the licensee using time history seismic input into the Visual Nastran computer code. The analysis model evaluated multiple freestanding bodies responding to the input seismic motion with friction at various contact surfaces acting as resisting forces. The inspectors identified a number of concerns regarding the calculation. The inspectors concerns regarding regulatory requirements and acceptable analytical methods were discussed with the Division of Spent Fuel Storage and Transportation staff and the licensee. In response to inspector concerns, the licensee decided to abandon the plan to use a freestanding stack-up configuration and instead, at this time, provide physical restraint of the structural configuration during MPC transfer operations. The inspectors did not make a determination of a performance deficiency or significance of these concerns by the end of the inspection. The licensee documented the inspectors concerns in CARD 10-22717. In addition, the inspectors identified the licensee is planning to deploy additional configurations of free-standing, non-stacked casks during ISFSI loading operations within the reactor building, using similar analytical methods. This issue will be a URI pending further review of the calculation by the inspectors after the Division of Spent Fuel Storage and Transportation provides inspection and regulatory guidance pertaining to seismic analysis of unrestrained structures and components. In addition, the inspectors will assess the acceptability of other free-standing, non-stacked casks, as needed. |
| Site: | Fermi  |
|---|---|
| Report | IR 05000341/2011003 Section 4OA5 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Dahbur A Shaikh B Kemker J Bozga M Kunowski M Learn P Smagacz R Edwards S Bellv Meghanij Tapp R Jones J Bozga R Temps M Learn J O'Donnell R Jickling M Mitchell J Neurauter R Morris |
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Finding - Fermi - IR 05000341/2011003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Fermi) @ 2011Q2
Self-Identified List (Fermi)
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