Document: NUREG-0800
Document ID: b8d2b8f5-432a-4c0a-81ab-20231f7d0f28
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT EVALUATION FOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1508/ML15089A068.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
e release of significant quantities of radioactive fission 5 If the applicant is merely identifying expected uses and applications of the PRA in subsequent phases, the staff will typically not perform detailed reviews of this information, but rather, will use this information in planning and preparing for these reviews in the subsequent phases. However, if the applicant requests, as part of its application, review and approval of a risk-informed application that will be implemented during a later phase, the staff will perform the necessary review. For example, at the COL phase, an applicant may propose to implement 10 CFR 50.69, “Risk-Informed Categorization and Treatment of Structures, Systems and Components for Nuclear Power Reactors,” during the construction phase and need to have that risk-informed application approved before that time. The staff should use additional guidance outside this SRP section (e.g., RG 1.174 and RG 1.178 for risk-informed TS) to support these reviews. 19.0-20 Revision 3 – December 2015 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 a design acceptance criteria (DAC) has been approved by the Commission, the staff allows the DAC approach to be used in