Document: NRC Regulatory Guide
Document ID: 5e2766ae-dd3b-4b1a-a6bb-48bde2dcbf97
Document Type: regulatory_guide
Title: Performance-Based Emergency Preparedness for Small Modular Reactors, Non-Light-Water Reactors, and Non-Power Production or Utilization Facilities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1808/ML18082A044.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.242
CFR Part: 
CFR Title: 

Content:
el as described in Section A-3.3. 3. ATMOSPHERIC TRANSPORT MODEL •Model the potential exposures to offsite populations as described in Section A-3.4. 4. EXPOSURE MODEL •Estimate potential doses to offsite populations as described in Section A-3.5. 5. DOSE ESTIMATION •Aggregate dose distance information as described in Section A-3.6. 6. PROBABILISTIC DOSE AGGREGATION DG-1350, Appendix B, Page B-1 APPENDIX B DEVELOPMENT OF INFORMATION ON SOURCE TERMS This appendix provides guidance for establishing source terms that are acceptable to the staff associated with a technology-inclusive, risk-informed approach to support radiological dose assessment for emergency planning zone (EPZ) size evaluation. B-1. Each applicant should develop potential source terms from credible accidents for its facility. The NRC staff evaluates these source terms in various areas of its application review, such as the review of design basis accident (DBA) and beyond design basis accident (BDBA) analyses for power reactors. For the source term evaluation, the applicant should identify in the analysis the release scenarios for which doses would be assessed by considering a spectrum of accidents credible for the facility. For BDBA scenarios, the applicant should evaluate the frequencies to allow quantitative consideration of the relative likelihood of a range of accidents. In developing information on release scenarios and their frequencies, the applicant should consider information developed in the safety analysis report for design basis accidents and severe accidents, as well as information in the environmental report on the consequences of severe accidents, as applicable. B-2. If the applicant intends to use a probabilistic risk assessment (PRA) to define the spectrum of credible accidents for the facility, the applicant should apply a risk-informed integrated decision making process.9 The integrated decision making process should consider the defense-in-depth philosophy, maintain