Document: NUREG-0800
Document ID: 7d53889c-d236-4e84-9579-a2beb4716167
Document Type: srp
Title: SEISMIC CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070296.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.1
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Mechanical Engineering Branch (EMEB)1 Secondary - Civil Engineering and Geosciences Branch (ECGB)2 I. AREAS OF REVIEW General Design Criterion 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 3 earthquakes without loss of capability to perform their safety functions. The earthquake for which these plant features are designed is defined as the safe shutdown earthquake (SSE) in 10 CFR Part 100, Appendix A. 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 structures, systems, and componentsSSCs important to safety are designed to remain 4 functional. Those plant features that are designed to remain functional if an SSE occurs are designated seismic Category I in Regulatory Guide 1.29. The EMEB reviews the seismic classification of those structures, systems, and 5 componentsSSCs (including their foundations and supports) which are important to safety and 6 are designed to withstand, without loss of function, the effects of a SSE and specified as seismic Category I by the applicant's in his safety analysis report (SAR). The review covers 7 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 a unacceptable safety level, or could result in incapacitating injury to control room occupants, and therefore must be seismically qualified. In addition, the EMEB reviews the identification of radioactive waste 8 (1) See Appendices C and D, SRP Section 3.2.2 - "System Quality Group Classification," for guidance. DRAFT Rev. 2 - April 1996 3.2.1-2 management SSCs that require seismic design considerations as specified in Regulatory Guide 1.143.9 This review which is coordinated with each branch that has primary review