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:
nitiated accident sequences. The overall HCLPF capacity of two or more SSCs that contribute to a sequence using OR Boolean logic is equal to the lowest individual HCLPF capacity of the constituents of the group. If AND Boolean logic is used, the HCLPF capacity of the group is equal to the highest individual HCLPF capacity of the constituents. When evaluating several accident sequences to determine the “plant level HCLPF capacity,” the plant-level HCLPF capacity is equal to the lowest of the sequence- level HCLPF capacities. 19.0-18 Revision 3 – December 2015 that the proposed alternative provides an acceptable method of complying with the relevant NRC requirements identified in Subsection II. The staff will review the description of the PRA and its results in order to make the evaluation findings described in this SRP section. In addition to a qualitative description, the staff will review some quantitative results (e.g., mean core damage frequencies, mean large release frequencies, and importance measures). The NRC should review this information to ensure that it is able to conclude that the applicant has performed sufficiently complete and scrutable analyses, the results and insights support the application, and the applicant has in place programs and processes that will enable it to maintain an up-to-date PRA for these uses and applications. RG 1.206, Section C.I.19, provides detailed guidance on the information expected to be included in Chapter 19 of the applicant’s FSAR. Specific application content that the staff should review is not reproduced in this SRP section, only review guidance on specific topics. Instead, the staff should use RG 1.206 in parallel with the SRP to determine that the appropriate topics have been addressed by the applicant. Although Chapter 19 of the applicant’s FSAR should include the information needed by the staff to determine that the relevant acceptance criteria have been met, some staff audits of the PRA and supporting