Document: NUREG-0800
Document ID: 817bb0ad-6fd7-433e-aa2b-b4b3e1166f9c
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT EVALUATION FOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0717/ML071700652.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
the phrase “assumption” is intended to be consistent with its usage in RG 1.200. 9 “PRA-based insights” are those insights identified during the DC process that ensure that assumptions made in the PRA will remain valid in the as-to-be-built, as-to-be-operated plant and include assumptions regarding SSC and operator performance and reliability, ITAAC, interface requirements, plant features, design and operational programs, and others. The usage of this phrase is intended to be consistent with its use in referring to the information provided in Table 19.59-29 in the AP600 design control document. 19.0-13 Revision 2 - June 2007 evaluating the appropriateness of internal events that are screened out or incorporated into other evaluations (e.g., grouped events). For the internal events evaluated, the staff should review the PRA to ensure that it appropriately identifies and describes the following aspects: i. Significant Core Damage Sequences and their numerical values C Significant7 core damage sequences C Significant internal initiating events C Significant functions, SSCs, and operator actions (typically determined by importance measures such as risk achievement worth and Fussell-Vesely importance measures) C PRA assumptions8 and PRA-based insights9 C Results and insights from importance, sensitivity, and uncertainty analyses ii. Significant Large Release Sequences and their numerical values C Significant large release sequences C Significant internal initiating events C Significant functions, SSCs, and operator actions C Containment performance C PRA assumptions and PRA-based insights C Results and insights from importance, sensitivity, and uncertainty analyses 19.0-14 Revision 2 - June 2007 B. External Events at Full Power For external events occurring under full-power operating conditions, this review should address the PRA results and insights of the plant-specific PRA. This review should ensure that the external events are properly evaluated, including