Document: NUREG-0800
Document ID: 78905d69-1945-4638-99b9-2db68eb3da77
Document Type: srp
Title: SEISMIC SYSTEM ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070318.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
icient margin for the limited accuracy, quantity, and period of time in which historical data have been accumulated. 2B. Appendix A to 10 CFR Part 100 - Two earthquake levels , the safe shutdown 20 21 22 earthquake (SSE) and the operating basis earthquake (OBE) , shall be considered in the 23 24 design of safety-related structures, components, and systemsSSCs . Appendix A to 10 25 CFR Part 100 further states that the design used to ensure that the required safety functions are maintained during and after the vibratory ground motion associated with DRAFT Rev. 3 - April 1996 3.7.2-6 the safe shutdown earthquake shall involve the use of either a suitable dynamic analysis or a suitable qualification test to demonstrate that structures, systems, and componentsSSCs can withstand the seismic and other concurrent loads, except where it 26 can be demonstrated that the use of an equivalent static load method provides adequate conservatism. Specific criteria necessary to meet the relevant requirements of GDC 2 and Appendix A to 10 CFR Part 100 are as follows: 27 1. Seismic Analysis Methods The seismic analysis of all Category I structures, systems, and componentsSSCs should 28 use either a suitable dynamic analysis method or an equivalent static load method, if justified. The SRP criteria generally deal with linear elastic analysis coupled with allowable stresses near elastic limits of the structures. However, for certain special cases (e.g., evaluation of as-built structures), the staff has accepted the concept of limited inelastic/nonlinear behavior when appropriate. The actual analysis, incorporating inelastic/nonlinear considerations, is reviewed on a case-by-case basis. a. Dynamic Analysis Method A dynamic analysis (e.g., response spectrum method, time history method) should be used. The use of the equivalent static load method is also acceptable if the method can be justified. To be acceptable, dynamic analyses should consider the following items: (i) Use of appropriate