Document: NUREG-0800
Document ID: 1c54f5f9-dd57-4543-a00d-1597061af2e0
Document Type: srp
Title: SEISMIC CLASSIFICATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1608/ML16084A812.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.2.1
CFR Part: 
CFR Title: 

Content:
on a case by case basis. The designer will impose design requirements and classifications for these SSCs commensurate with their risk significance. For example, in SECY-96-128 and its associated SRM, it was decided that certain RTNSS SSCs for passive advanced light-water reactors (ALWRs) (RTNSS B) need not be safety-related or subject to dynamic qualification, but their anchorage did need to be designed for seismic events and their equipment enclosed in a seismically designed structure. Depending on the particular safety function, other design classifications and criteria may be considered for nonsafety-related SSCs. As part of the PRA, the seismic margins analysis may also be considered in determining which SSC are credited for seismic events and the degree to which they are to be designed for seismic events. IV. EVALUATION FINDINGS The reviewer verifies that the applicant has provided sufficient information and that the review and calculations (if applicable) support conclusions of the following type to be included in the staff’s safety evaluation report. The reviewer also states the bases for those conclusions. SSCs (excluding electrical features) that are important to safety have been classified as seismic Category I items, have been designed to withstand the effects of an SSE, and have been 3.2.1-12 Revision 3 – July 2016 identified in an acceptable manner in Tables 3.X.X and 3.X.X, and on system piping and instrumentation diagrams in the SAR. Other SSCs not identified as seismic Category I, but whose failure could reduce the functioning of any seismic Category I feature to an unacceptable safety level or injure control room personnel, are identified for analysis to assure the SSE will not cause such failures. The staff concludes that the SSCs important to safety that are within the scope of this review have been properly classified, are within the scope of the applicant’s QA Program, and thus meet the relevant requirements of GDC 1, 2, and 60, 10 CFR