Document: NUREG-0800
Document ID: 8dd882f4-a34f-4415-acd1-ebb441c72786
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1213/ML12132A481.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
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Content:
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 3 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