Document: NUREG-0800
Document ID: 10bc45c3-8e70-44ed-a57b-2dd08d4ef847
Document Type: srp
Title: SEISMIC SUBSYSTEM ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070640313.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.3
CFR Part: 
CFR Title: 

Content:
A provides definitions for the OBE and the SSE, and requires that the engineering methods, used to ensure that the required safety functions are maintained during and after the vibratory ground motion associated with the SSE, involve the use of either a suitable dynamic analysis or an appropriate qualification test methodology. 10 CFR 100, Appendix A requires that the applicable levels of vibratory ground motion corresponding to the OBE and the SSE are properly defined, and that adequate methods are used to demonstrate that SSCs important to safety can withstand the seismic and other concurrently applied loads. 10 CFR Part 100, Subpart B, which is applicable to power reactor site applications on or after January 10, 1997, refers to 10 CFR 100.23 of this part for seismic criteria. 10 CFR 100.23 describes the criteria and nature of investigations required to obtain the geologic and seismic data necessary to determine the suitability of the proposed site and the plant design bases. 10 CFR 100.23 also indicates that applications to engineering design are contained in 10 CFR Part 50, Appendix S. SRP Section 3.7.3 describes acceptable analytical methods for seismic evaluation of seismic Category I subsystems. Criteria for seismic qualification of mechanical and electrical equipment by test is provided in SRP Sections 3.9.2 and 3.10. The criteria in SRP 3.7.3 provide methods acceptable to the staff for performing static and dynamic seismic analysis of subsystems. Criteria for determination of the equivalent static coefficient of acceleration for the static method and criteria for performing response spectrum or time history analyses for dynamic methods are provided. Meeting these requirements provides assurance that appropriate engineering methods will be used to seismically qualify subsystems important to safety, and thereby ensure that they will be able to perform their intended safety function when subjected to the SSE and OBE (if applicable). 3.7.3-9 Revision 3 - March