Document: NUREG-0800
Document ID: f8a4400f-c923-4c85-a218-74f8be42235c
Document Type: srp
Title: -12
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1233/ML12334A360.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.3
CFR Part: 
CFR Title: 

Content:
of design and service loading combinations are reviewed to determine if they meet those specified in Appendix A. The criteria to ensure piping component functional capability are reviewed to determine their adequacy in meeting the objectives set forth in Appendix A. Deviations from the position may be permitted provided justification is presented by the applicant. The acceptability determination is based on considerations of adequate margins of safety. In SECY-93-087, “Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light-Water Reactor (ALWR) Designs,” dated April 2, 1993, the staff discussed eliminating the operating-basis earthquake (OBE) from the design bases when the OBE is established at less than or equal to one third of the safe-shutdown earthquake (SSE). In the associated Staff Requirements Memorandum (SRM) dated July 21, 1993, the Commission approved the staff’s recommendations associated with eliminating the OBE from the design bases. Appendix S to 10 CFR Part 50, “Earthquake Engineering Criteria for Nuclear Power Plants,” first issued in 1996 and revised in 2007, implements Commission policy related to the use of OBE ground motion for applications submitted after January 10, 1997. If the OBE is defined as greater than one-third of the SSE, paragraph IV.(a)(2) requires analysis and design to demonstrate that SSCs remain functional and within applicable stress, strain, and deformation limits. Loads from the OBE, therefore, would be included in the design analyses for seismic