Document: NRC Regulatory Guide
Document ID: acab976c-e936-49be-8c59-865767973599
Document Type: regulatory_guide
Title: Guidance for a Technology-Inclusive Content of Application Methodology to Inform the Licensing Basis and Content of Applications for Licenses, Certifications, and Approvals for Non-Light-Water Reactors (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2319/ML23194A194.pdf
Revision Date: 2023-09
Chapter: 
Section ID: RG-1.253
CFR Part: 
CFR Title: 

Content:
nt should justify the use of the chosen code or standard for the particular reactor described in the application. If the facility includes SR equipment and components designed with materials that will be called upon to withstand high-temperature service conditions, the applicant may reference ASME Boiler and Pressure Vessel Code, Section III, Division 5, “High Temperature Reactors,” (Ref. 44), as endorsed by Regulatory Guide 1.87, “Acceptability of ASME Code Section III, Division 5, 'High Temperature Reactors,'” Revision 2 (Ref. 45). Appendix A of this document provides a listing of draft documents under development that the staff is considering that could potentially supplement the guidance found in RG 1.87. 8. Non-safety-Related with Special Treatment (NSRST) Structures, Systems, and Components Criteria and Capabilities Section C.7 of NEI 21-07, Revision 1, provides guidance on the information related to the NSRST classification of SSCs, as well as their associated criteria and capabilities. Chapter 7 of a SAR following NEI 21-07, Revision 1, should describe the design and special treatment requirements for those SSCs classified as NSRST in Chapter 5 of the SAR. NSRST SSCs are not directly associated with RFDC (i.e., they are not SR SSCs) but are relied upon to perform risk-significant functions. Special treatments are defined above, with additional information provided in NEI 18-04, Revision 1. Risk-significant SSCs are those that perform functions that prevent any LBE from exceeding the frequency-consequence targets or that contribute significantly to the cumulative risk metrics selected for evaluating the total risk from all analyzed LBEs. Appendix A to NEI 21-07, Revision 1, gives a more detailed definition of risk-significant SSCs. For those NSRST SSCs whose reliability and capabilities have not been confirmed at the CP stage, the application should include a discussion in the SAR on how the applicant intends to confirm, at the OL stage, that