Document: NUREG-0800
Document ID: 73747cf4-ff95-449b-b6b0-53dc0755b9e0
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12353A382.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
t significant peak frequency shift between the response spectra at the lower and higher elevations B. A static analysis of the rack system by subjecting it to the maximum relative support displacement The resulting stresses from the two analyses above should be combined by the absolute sum method. To determine the flexibility of the pool wall, it is acceptable for the applicant to use equivalent mass and stiffness properties obtained from calculations similar to those described in “Introduction to Structural Dynamics,” McGraw-Hill Book Co., New York, 1964, by Biggs, John M. Should the fundamental frequency of the pool wall model be higher than or equal to 33 hertz, it may be assumed that the response of the pool wall and the corresponding lateral support to the new rack system are identical to those of the base slab, for which appropriate floor response spectra or ground response spectra may already exist. 6. Structural Acceptance Criteria Table 1 of this Appendix provides the structural acceptance criteria, in accordance with ASME Code, Section III, Division 1, Subsection NF. When considering compression 3.8.4-33 Draft Revision 4 – December 2012 loads, Subsection NF, Paragraph 3300, specifies additional criteria that must be satisfied to preclude buckling. For impact loading, the ductility ratios used to absorb kinetic energy in the tensile, flexural, compressive, and shearing modes should be quantified. In the consideration of the effects of seismic loads, factors of safety against gross sliding and overturning of racks and rack modulus under all probable service conditions should be in accordance with SRP Section 3.8.5, Subsection II.5. This position on factors of safety against sliding and tilting need not be met provided that the applicant meets any one of the following conditions: A. Detailed nonlinear dynamic analyses show that the amplitudes of sliding motion are minimal and impact between adjacent rack modules or between a rack module and the pool