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:
f the facility (excluding electrical features) need not be designed to seismic Category I requirements. Those SSCs not required to be designed to seismic Category I requirements include those portions of seismic Category I systems such as vent lines, drain lines, fill lines and test lines on the downstream side of isolation valves and those portions of the system not required to perform a safety function.51 Classification guidelines for selected BWR main steam system SSCs are addressed in SRP Section 3.2.2 Appendix A. For General Electric BWR/6 main steam lines and main feedwater lines, an acceptable alternate seismic classification to that currently specified in Position C.1.e of Regulatory Guide 1.29 is provided in Figure B-1 attached to Appendix B of SRP Section 3.2.2. For BWRs that do not include a main steam isolation valve leakage control system, and for which main steam line fission product hold-up and retention is credited in the analysis of design basis accident radiological consequences, an acceptable alternative seismic classification for the main steam lines and associated systems is provided in Appendix A of SRP Section 3.2.2.52 The information in the SAR is reviewed to identify SSCs whose continued function is not required following a seismic event, but whose failure could reduce the functioning of any seismic Category I feature to an unacceptable safety level, or could result in incapacitating injury to control room personnel, to assure that such items will be analyzed and designed to maintain their integrity under seismic loading from the SSE.53 The information in the SAR is also reviewed to identify radioactive waste management system SSCs to assure that those SSCs requiring seismic design considerations have been identified consistent with those systems specified in Regulatory Guide 1.143.54 In the event an applicant intends to take exception to Regulatory Guides 1.29, 1.143 and/or 1.151, but has not provided an adequate justification for his