Document: NUREG-0800
Document ID: 838f03f5-e038-48e3-9af7-74af5e319676
Document Type: srp
Title: through 3.5.3.3 for earth retaining walls).
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550054.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.3.1
CFR Part: 
CFR Title: 

Content:
f the sum of the squares in accordance with RG 1.92. If response spectra are available for a vertical and horizontal direction only, the same horizontal response spectra may be applied along the other horizontal direction. Submergence in water may be taken into account. The effects of submergence are evaluated on case-by-case basis. Because of gaps between fuel assemblies and the walls of the guide tubes, additional loads will be generated by the impact of fuel assemblies during a postulated seismic excitation. Additional loads resulting from this impact effect may be determined by estimating the kinetic energy of the fuel assembly. The maximum velocity of the fuel assembly may be estimated to be the spectral velocity associated with the natural frequency of the submerged fuel assembly. Loads thus generated should be considered for local as well as overall effects on the walls of the rack and the supporting framework. It should be demonstrated that the consequent loads on the fuel assembly do not lead to damage of the fuel. Loads generated from other postulated impact events may be acceptable, if the total mass of the impacting missile, the maximum velocity at the time of impact, and the ductility ratio of the target material used to absorb the kinetic energy are described. 4. Loads and Load Combinations Any change in the temperature distribution resulting from the proposed modification should be identified. Information pertaining to the applicable design loads and their various combinations should be provided and indicate the thermal load resulting from the maximum temperature distribution through the pool walls and base slab. The temperature gradient across the rack structure that results from the differential heating effect between a full and an empty cell should be indicated and incorporated in the design of the rack structure. Maximum uplift forces available from the crane should be indicated and include consideration of these forces in the design of the racks