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:
ng consideration of operator actions, such that the plant’s operation will reflect a reduction in risk compared to existing operating plants.1 The second aspect is the use and application of the PRA results and insights to support other programs. 1. The applicant’s PRA and severe accident evaluation are used as follows: A. During the design phase i. Identify and address potential design features and plant operational vulnerabilities, where a small number of failures could lead to core damage, containment failure, or large releases (e.g., assumed individual or common-cause failures could drive plant risk to unacceptable levels with respect to the Commission’s goals, as presented below), ii. Reduce or eliminate the significant risk contributors of existing operating plants that are applicable to the new design by introducing appropriate features and requirements, and 2 These are goals and not regulatory requirements, and applicants should not artificially (or intentionally) increase PRA results associated with one metric simply to meet the goal associated with another metric. Rather, the applicant should compare its plant-specific PRA results and insights against these goals and address how its plant features properly balance severe accident prevention and mitigation, consistent with Item D. 3 The Commission staff requirements memorandum (SRM) dated June 26, 1990, in response to SECY-90-016 established the identified goals. 19.0-3 Revision 2 - June 2007 iii. Select among alternative features, operational strategies, and design options. B. Identify risk-informed safety insights based on systematic evaluations of the risk associated with the design, construction, and operation of the plant such that the applicant can identify and describe the following: i. The design’s robustness, levels of defense-in-depth, and tolerance of severe accidents initiated by either internal or external events, and ii. The risk significance of specific human errors associated with