Document: NUREG-0800
Document ID: dd4f84a9-8976-44c4-b631-d7c0254f4efc
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT EVALUATION FOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1416/ML14161A594.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
cations. 4. The staff reviews the description of the applicant’s PRA in Chapter 19 of the FSAR and its associated results and insights, addressing the full scope of information outlined in RG 1.206, Section C.I.19. In particular, the staff should review the applicant’s identification of significant plant features (including nonsafety-related systems) and operator actions that are important to reduce risk and confirm that the plant will meet the expectation identified above that reactors will reflect an extremely low probability for accidents that could result in the release of significant quantities of radioactive fission products. In addition, for a COL referencing a DC, the staff should compare the COL applicant's PRA-based insights with those described in the DC to identify potential changes and to verify that the applicant has properly dispositioned each insight. 5. The staff review should include a broad (qualitative and quantitative) comparison of risks, by initiating event category, between the proposed design and existing operating plant designs (from which the proposed design evolved) to identify the major design features that contribute to the reduced risk of the proposed design compared to existing plant designs (e.g., passive systems, less reliance on offsite and onsite power for accident mitigation, and divisional separation). 6. The staff reviews key assumptions in the PRA related to design areas that have not been completed. Where design acceptance criteria (DAC) has been approved by the Commission, the staff allows the DAC approach to be used in specific areas (i.e., radiation protection, piping, instrumentation and controls, and human factors engineering) in lieu of detailed design information. However, to allow staff to evaluate the resolution of severe accident issues in the design and to ascertain how the risk insights from the design PRA are derived, DC applicants should address those portions 4 If the applicant is merely identifying