Document: NUREG-0800
Document ID: 73dc4705-6dff-4f44-87ee-2a6f76cc6536
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A258.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
eptember 2013 It should be demonstrated that the consequent loads on the fuel assembly do not lead to damage of the fuel. Damage of the fuel refers to structural elements of a fuel assembly (including the fuel rod cladding) which are stressed beyond the material allowable limits (established in terms of either strength or strain limits) such that the fuel rods are no longer able to provide confinement for contained radioactive fission materials. An evaluation considering pertinent failure modes (such as buckling, etc.) should be performed to demonstrate that when subject to the consequent loads resulting from the various load combinations described in Table 1, the structural elements of the fuel assembly will not exceed appropriate material allowable limits. Irradiation embrittlement effects, as well as pool temperature effects on the material properties, should be adequately accounted for in establishing the material allowable limits. Evaluations based on testing results to demonstrate structural integrity of the fuel assembly may also be acceptable, provided that the testing configurations and parameters are consistent with those for the fuel assembly being evaluated. To this end, the testing results are evaluated on a case-by-case basis in determining the structural integrity of the fuel assembly. The evaluation should also confirm that any fuel assembly deformation resulting from the applicable load combinations does not degrade the coolable configuration of the fuel assembly to an unacceptable level. 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 Information pertaining to the applicable design loads and their various combinations should be provided. If applicable, any change in the temperature distribution resulting from a