ML24348A146
| ML24348A146 | |
| Person / Time | |
|---|---|
| Site: | 07201032 |
| Issue date: | 12/12/2024 |
| From: | Holtec |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML24348A143 | List: |
| References | |
| 5018121 | |
| Download: ML24348A146 (1) | |
Text
HOLTEC INTERNATIONAL COPYRIGHTED MATERIAL REPORT HI-2114830 Proposed Rev. 11B 3-99 Referring to the spacing dimensions for HI-STORM FW arrays in Table 1.4.1, the minimum space between HI-STORM FW overpacks and the minimum distance of the overpack to the edge of the pad are calculated. The above table demonstrates the HI-STORM FW overpack will not collide with another overpack, and the overpack will not slide off the pad due to the combined effects of a large tornado missile impact and high wind.
No generic limits for sliding are established for HI-TRAC VW and HI-TRAC VW Versions V and V2 transfer casks. Therefore, the sliding result for the HI-TRAC VW and the HI-TRAC VW Versions V and V2 transfer casks in Table 3.4.16 are strictly informational.
- b.
Small and Intermediate Missiles The small and intermediate missiles (Table 2.2.5) are analyzed to determine the extent to which they will penetrate the HI-STORM FW overpack or the HI-TRAC VW and cause potential damage to the MPC Enclosure Vessel. Classical energy balance methods are used to compute the depth of penetration at the following impact locations:
- on the HI-STORM FW outer shell (with concrete backing)
- on the HI-STORM FW lid top plate (with concrete backing)
- on the HI-TRAC VW outer shell (with lead backing)
- on the top surface of the MPC upper lid The MPC upper lid is analyzed for a direct missile impact because, when the MPC is placed inside the HI-TRAC VW, the MPC lid is theoretically accessible to a vertically downward directed small or intermediate missile.
The following assumptions are made in the analysis:
- i.
The intermediate missile and the small missile are assumed to be unyielding, and hence the entire initial kinetic energy is assumed to be absorbed by local yielding and denting of the cask surface.
ii.
No credit is taken for the missile resistance offered by the HI-TRAC VW water jacket shell for the small and intermediate missiles specified in Table 2.2.5. It is assumed a priori that the small and intermediate missiles will penetrate the water jacket shell (with no energy loss). Therefore, in the analysis 100% of the missile impact energy is applied directly to the HI-TRAC VW outer shell. For site-specific tornado missiles with impact energies exceeding those for the small and intermediate missiles in Table 2.2.5, the HI-TRAC VW water jacket shell may be credited as an additional missile barrier.
iii.
For missile strikes on the side and top lid of the overpack, the analysis credits the structural resistance in compression offered by the concrete material that backs the outer shell and the lid.
iv.
The resistance from the concrete is conservatively assumed to act over an area equal to to Holtec Letter 5018121 Page 1 of 1