Document: NUREG-0800
Document ID: 2ff4b7bf-0033-46ea-abe0-313b6bff2ac6
Document Type: srp
Title: SEISMIC CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190002.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.1
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for mechanical engineering reviews Secondary - Organizations responsible for the review of component performance and testing. I. AREAS OF REVIEW General Design Criterion (GDC) 2 of 10 CFR Part 50, Appendix A, in part, requires that structures, systems, and components (SSCs) important to safety be designed to withstand the effects of earthquakes without loss of capability to perform their safety functions. The earthquake against which these plant features are designed is defined as the safe shutdown earthquake (SSE) in 10 CFR Part 100, Appendix A, and 10 CFR Part 50, Appendix S. The SSE is based upon an evaluation of the maximum earthquake potential and is that earthquake which produces the maximum vibratory ground motion for which SSCs important to safety are designed to remain functional. Appendix S also requires consideration of surface deformation. Those plant features that are designed to remain functional if an SSE occurs are designated Seismic Category I in Regulatory Guide (RG) 1.29. Requirements for SSCs whose function is necessary for continued operation during and following an operating basis earthquake (OBE) are discussed in 10 CFR Part 50, Appendix S. 1See SRP Section 3.2.2 - "System Quality Group Classification," for guidance. 3.2.1-2 Revision 2 - March 2007 The specific areas of review are as follows: 1. This SRP section reviews the seismic classification of those SSCs (including their foundations and supports) that are important to safety and are designed to withstand, without loss of function, the effects of a SSE and specified as Seismic Category I by the applicant's safety analysis report (SAR). The review covers identification of SSCs that are not required to remain functional following a seismic event, but whose failure could reduce the functioning of any Category I SSCs to an unacceptable safety level, or could result in incapacitating injury to control room occupants, and therefore must