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:
d in RG 1.151, “Instrument Sensing Lines,” ventilation systems, standby diesel generator auxiliary systems, fuel handling systems, and cranes. 3. The staff reviews seismic Category I SSCs that are identified in RG 1.189, “Fire Protection for Nuclear Power Plants,” to establish the design provisions of fire protection to withstand seismic loading from the SSE. This RG identifies portions of fire protection SSCs needing seismic design consideration. 4. The applicant’s proposed seismic classification may in part be presented in the form of a table1 that identifies those SSCs that are designated as seismic Category I. The table should identify all activities affecting the safety functions of these seismic Category I plant features that should also meet GDC 1, “Quality Standards and Records,” and the pertinent quality assurance (QA) requirements of 10 CFR Part 50, Appendix B, “Quality Assurance Criteria for Nuclear Power Plants and Fuel Reprocessing Plants.” The acceptability of QA applied to SSCs that have seismic design considerations is determined in accordance with RG 1.29. Details of the seismic classification of these plant features may be shown on plot plans, general arrangement drawings, and piping and instrumentation diagrams. a. If the applicant has established the OBE ground motion at less than or equal to one-third of the SSE ground motion, per Staff Requirement Memorandum to SECY-93-087 approved by the Commission, the OBE is eliminated from the design of SSCs. The OBE will serve as an “inspection level earthquake” below which the effect on health and safety of the public would be insignificant and above which the licensee would be required to shut down the plant and inspect 1 See SRP Section 3.2.2 - "System Quality Group Classification," for guidance. 3.2.1-3 Draft Revision 3 – August 2015 the damage, in accordance with 10 CFR Part 50, Appendix S. A list of the SSCs necessary for continued safe operation during and following an OBE is