Document: NRC Regulatory Guide
Document ID: 239cc7c1-f2cb-46cc-945d-8009db28aa6c
Document Type: regulatory_guide
Title: General Site Suitability Criteria for Nuclear Power Stations + HISTORY - HISTORY 12/2023 – DG-4034 , Proposed Revision 4 12/2011 – DG-4021 , Proposed Revision 3 02/1995 – DG-4004, Second Proposed Revision 2 11/1992 – DG-4003, Proposed Revision 2 (Rev. 4)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML2312/ML23123A090.pdf
Revision Date: 2023-10
Chapter: 
Section ID: RG-4.7
CFR Part: 
CFR Title: 

Content:
ssment and evaluation of the SSCs that bear significantly on the offsite dose evaluation factors. In performing this assessment, an applicant is required (e.g., by 10 CFR 50.34(a)(1)(ii)(D)) to assume a fission product release from the core into the containment using the expected demonstrable containment leak rate and any fission product cleanup systems intended to mitigate the consequences of accidents. When performing a comprehensive evaluation of postulated accidents, it is important to establish that what is analyzed is bounding for the siting analysis in terms of parameters (e.g., temperatures, stresses) to determine conservative estimates of the radionuclide release(s) from the first barrier (and potentially intermediate barriers). This can be done by performing a systematic assessment of the potential accidents and hazards and demonstrating that these events adequately envelope the facility design such that the analyses that are used are limiting. For example, the International Atomic Energy Agency Safety Guide, Specific Safety Requirements No. SSR-2/1, “Safety of Nuclear Power Plants: DG-4034, Appendix A, Page A-7 Design”j includes information on a systematic search for hazards that should be conducted for nuclear reactor sites. The Safety Guide identifies the following as Requirement 16, “Postulated initiating events”: The design for the nuclear power plant shall apply a systematic approach to identifying a comprehensive set of postulated initiating events such that all foreseeable events with the potential for serious consequences and all foreseeable events with a significant frequency of occurrence are anticipated and are considered in the design. It is important to note that applicants should document all anticipated hazards, including those excluded from consideration. If an event is precluded by some aspect of the design or an analytical assumption, that should be noted and justified. (b) Establish Radionuclide Release(s) from the First Barrier