Document: NUREG-0800
Document ID: 49dad160-99d7-4356-a70a-18bb6f08d141
Document Type: srp
Title: SEISMIC CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1422/ML14227A643.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.1
CFR Part: 
CFR Title: 

Content:
ety functions. Regulations in 10 CFR Part 50, Appendix B, establish QA program requirements for the design, construction, and operation of SSCs important to safety. The requirements of 10 CFR Part 50, Appendix B apply to activities affecting the safety- related functions of those SSCs, including those SSCs defined by the guidance of RG 1.29 as seismic Category I SSCs. Specifying and using appropriate quality standards and requirements in accordance with 10 CFR Part 50, Appendix B, for the design of SSCs important to safety minimizes the potential for failures of those SSCs, including seismic Category I SSCs that prevent or mitigate the consequences of postulated accidents that could cause undue risk to the health and safety of the public. 2. Compliance with GDC 2 requires that nuclear power plant SSCs important to safety be designed to withstand the effects of natural phenomena, including earthquakes, without loss of capability to perform their safety functions. Also, compliance with 10 CFR Part 100, Appendix A and 10 CFR Part 50, Appendix S, requires that certain SSCs be designed to withstand the SSE and remain functional. The SSCs are those necessary to ensure: (1) the integrity of the reactor coolant pressure boundary; (2) the capability to shut down the reactor and maintain it in a safe shutdown condition; or (3) the capability to prevent or mitigate the consequences of accidents that could result in potential offsite exposures comparable to the guideline exposures of 10 CFR Part 100. a. RG 1.29 describes an acceptable method of identification and classification of SSCs important to safety that should be designed to withstand the SSE. 3.2.1-7 Draft Revision 3 – August 2015 RG 1.29 states that systems and components required for safe shutdown, including their foundations and supports, are designated as seismic Category I and should be designed to withstand the effects of the SSE and remain functional. In addition, RG 1.29 recommends that systems, other than