Document: NUREG-0800
Document ID: 9687ba4a-508e-4167-9d91-a1bb9873aaef
Document Type: srp
Title: through 3.5.3.3 for earth retaining walls).
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1006/ML100630323.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.3.1
CFR Part: 
CFR Title: 

Content:
Subsection NF. All materials should be selected to be compatible with the fuel pool environment to minimize corrosion and galvanic effects. Design, fabrication, and installation of spent fuel racks of stainless steel material may be performed based on ASME Code, Section III, Division 1, Subsection NF requirements for Class 3 component supports. 3. Seismic and Impact Loads For plants where dynamic input data such as floor response spectra or ground response spectra are not available, necessary dynamic analyses may be performed using the criteria described in SRP Section 3.7. The ground response spectra and damping values should correspond to RG 1.60 and 1.61, respectively. For plants where dynamic data are available (e.g., ground response spectra for a fuel pool supported by the ground, floor response spectra for fuel pools supported on soil where soil-structure interaction was considered in the pool design, or a floor response spectra for a fuel pool supported by the reactor building), the design and analysis of the new rack system may be performed by using either the existing input parameters including the old damping values or new parameters in accordance with RG 1.60 and 1.61. The use of existing input with new damping values in RG 1.61 is not acceptable. Seismic excitation along three orthogonal directions should be imposed simultaneously for the design of the new rack system. The peak response from each direction should be combined by square root of 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.