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:
y percentage contribution, represent 90 percent or more of the core damage frequency.” 19.0-12 Revision 3 – December 2015 A. The design’s robustness, levels of defense-in-depth, and tolerance of severe accidents initiated by either internal or external events B. The risk significance of potential human errors associated with the design 5. The staff will determine whether the applicant has complied with 10 CFR 50.34(f)(1)(i): “Perform a plant/site specific probabilistic risk assessment, the aim of which is to seek such improvements in the reliability of core and containment heat removal systems as are significant and practical and do not impact excessively on the plant.” 6. The staff will determine whether the applicant has used the PRA results and insights, including those from uncertainty analyses, importance analyses, and sensitivity studies, in an integrated fashion. Expected uses of the PRA are listed in RG 1.206, Section C.I.19.2, and should be addressed in Section 19.1.1 of the applicant’s FSAR, as well as in the descriptions of programs that receive input from the PRA. The guidance documents related to the specific programs that receive input from the PRA contain acceptance criteria related to these programs. For example, Section C.I.17.4 of RG 1.206 presents the reliability assurance program (RAP) submittal guidance and SRP Section 17.4 gives the associated staff review guidance, including acceptance criteria. 7. The staff will determine whether the applicant has performed risk importance studies to determine the: (1) importance of components to risk; (2) importance of systems to risk; (3) importance of operator actions to risk; and (4) importance of initiating events to risk. Both risk increase (e.g., risk-achievement worth; Birnbaum importance) and risk- decrease (e.g., Fussell-Vesely importance; risk-reduction worth) measures should be used. 8. The staff will determine whether the applicant’s uncertainty analysis identifies major