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:
SDRS PGA. 3 A Min-Max method is used to determine the HCLPF capacity for an accident sequence from the HCLPF capacities of the contributing SSC failures, or the HCLPF capacity for the plant as a whole from the HCLPF capacities of a group of seismic-initiated 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. 19.0-20 Draft Revision 3 –November 2014 III. REVIEW PROCEDURES General Principles The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the identified SRP acceptance criteria. If the application deviates from these acceptance criteria, the staff should determine 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