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:
el requirements or attributes of the applicable PRA standard that the PRA did not embody, (2) addressed the impact on the qualitative and quantitative results of the PRA of excluding those high- level requirements or attributes of the standard that are applicable but have not been incorporated. The PRA is excluded from Tier 2 of the DC and it is not part of the design- basis information. However, the PRA is used to help identify Tier 1 (e.g., ITAAC) and Tier 2 information, including, but not limited to risk insights as described in Section C.II.1 of RG 1.206. 2. RG 1.200 contains the staff's guidance concerning PRA technical adequacy and peer review. Peer review of the DC PRA is not required prior to application, however, if a peer review or self-assessment was conducted prior to the application, the staff should examine the documented results. If a certain aspect of the PRA does not follow the positions in RG 1.200, the applicant should justify that this aspect of the PRA is acceptable and does not impact the PRA results or risk insights. Otherwise, applicants 19.0-21 Revision 3 – December 2015 need to correct the deficiency and resubmit the PRA results and risk insights. If a peer review has not been performed, the applicants should justify why their PRAs are adequate in terms of scope, level of detail, and technical adequacy. If the applicant’s justification fails to provide the staff with an appropriate level of confidence in the models, results, and insights, the staff should conduct an audit of the applicant’s PRA against the technical elements described in RG 1.200 to determine the PRA technical adequacy. Design-Specific PRA (Procedures Specific to Passive Designs) 1. The issue of T-H uncertainties in passive plant designs arises from the passive nature of the safety-related systems used for accident mitigation. Passive safety systems rely on natural forces, such as gravity, to perform their safety functions. Such driving forces are small compared to