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:
design compares favorably with the Commission’s approved use of a CPG, which includes (1) a deterministic goal that containment integrity be maintained for approximately 24 hours following the onset of core damage for the more likely severe accident challenges and (2) a probabilistic goal that the conditional containment failure probability be less than 0.1 for the composite of all core- damage sequences assessed in the PRA. The staff will determine whether the applicant has adequately demonstrated that the design properly balances preventive and mitigative features and represents a reduction in risk when compared to existing operating plants. The staff will determine whether the applicant has provided a sound technical basis for selecting the most likely severe accident challenges or followed the approach outlined in Section C.3.1(a) of RG 1.216.2 4. The staff will determine whether the applicant has identified risk-informed safety insights based on systematic evaluations of the risk associated with the design. The applicant should identify and describe the following: 1 The reference to existing operating plants applies to the LWR plant technology that existed at the time the Commission issued its Severe Accident Policy Statement on August 8, 1985. 2 RG 1.216, “Containment Structural Integrity Evaluation 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.” 19.0-12 Revision 3 – December 2015 A. The design’s robustness, levels of defense-in-depth, and tolerance of