Document: NUREG-0800
Document ID: 228b9b6e-c81e-4d76-9b8e-12f6c3bd7fa1
Document Type: srp
Title: and Regulatory Guide 1.92,(Reference 10) "Combining Modal Responses
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070336.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
s of components and equipment from the forcing frequencies of the support structure are reviewed to determine compliance with the acceptance criteria of subsection II.2.c of this SRP section. d. Three Components of Earthquake Motion The procedures by which the three components of earthquake motion are considered in determining the seismic response of systems are reviewed to determine compliance with the acceptance criteria of subsection II.2.d of this SRP section. DRAFT Rev. 3 - April 1996 3.9.2-22 e. Combination of Modal Responses The procedures for combining modal responses are reviewed to determine compliance with the acceptance criteria of subsection II.2.e of this SRP section, when a response spectrum modal analysis method is used. f. Analytical Procedures for Piping Systems For all Category I piping and applicable non-Category I piping, the methods of seismic analysis (response spectra, time history, equivalent static load) are reviewed to determine that the techniques employed are in accordance with the acceptance criteria of subsection II.2.f of this SRP section. Typical mathematical models are reviewed to judge whether all significant degrees of freedom have been included. g. Multiply-Supported Equipment and Components With Distinct Inputs The criteria for the seismic analysis of multiply-supported components and equipment with distinct inputs are reviewed to determine that the criteria are in accordance with the acceptance criteria of subsection II.2.g of this SRP section. h. Use of Constant Vertical Static Factors Use of constant static factors as response loads in the vertical direction for the seismic design of any Category I systems in lieu of a detailed dynamic method is reviewed to determine that constant static factors are used only if the structure is rigid in the vertical direction based on the definition for rigidity given in subsection II.2.h of this SRP section. i. Torsional Effects of Eccentric Masses The procedures for seismic analysis of