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:
n. 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. Guidance related to the specific programs that receive input from the PRA contains 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 that the applicant has performed risk importance studies at the system, train, and component level that adequately provide insights about (1) the systems that contribute the most in achieving the low risk level assessed in the PRA, (2) events (e.g., component failures or human errors) that contribute the most to decreases in the built-in plant safety level, and (3) events that contribute the most to the assessed risk. 8. The staff will determine that the applicant’s uncertainty analysis identifies major contributors to the uncertainty associated with the estimated risks. The staff will determine, for designs using passive safety systems and active defense-in-depth systems, that the applicant has performed sensitivity studies without credit for the 1 RG 1.216, “Containment Structural Integrity Evaluaion for Internal Pressure Loadings above Design-Basis Pressure,” states that: “The applicant provides the technical basis for identifying the more likely severe accident challenges. The staff will review the technical basis for identifying the more likely severe accident challenges on a case-by-case basis. An example of an acceptable way to identify the more likely severe accident challenges is to consider the sequences or plant damage states that, when ordered by percentage contribution, represent 90 percent or more of the core damage frequency.” 19.0-14 Draft Revision 3 –November 2014