Document: NUREG-0800
Document ID: f60cdc8f-3c25-45c3-a1d3-b0f530961625
Document Type: srp
Title: DETERMINING THE TECHNICAL ADEQUACY OF PROBABILISTIC RISK
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1219/ML12193A107.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.1
CFR Part: 
CFR Title: 

Content:
as been endorsed in RG 1.200 will be necessary to the extent needed to support the decision. However, even for the risk contributors addressed by standards, the staff may, under certain circumstances, decide to perform an audit to verify the technical adequacy of the PRA. An audit may be initiated for a number of reasons, some of which are identified below: • Lack of evidence that the self-assessment actions3 that are most relevant to the application have been adequately performed. 3 Self assessment actions are relevant for current operating reactor applications when the original or current peer review was performed using criteria (e.g., peer reviews using early Boiling Water Reactor Owners Group (BWROG) guidance and peer reviews using the NEI 00-02 subtier criteria) that are different from the provisions of ASME/ANS RA-Sa-2009 as endorsed by RG 1.200. 19.1- 8 Rev. 3 – September 2012 • Concerns about the resolution of peer review findings associated with the PRA technical requirements that apply to the application. • Contributors (e.g., accident sequences, cutsets, operator actions, etc.) to the results that differ from those seen at other, similar plants, and for which no plant-specific design features can be identified that would explain the differences. • Results that seem to be counterintuitive, e.g., a decrease in CDF when equipment is taken out of service. • Estimates of CDF or LERF that differ significantly from those in prior submittals from the same licensee, without a sufficient explanation. It is expected that a licensee using a PRA standard or standards and the industry peer-review process has taken account of the exceptions and clarifications found in the appendices of RG 1.200 and has documented the assessment of these matters with the relevant documents as endorsed. The capability category needed for each PRA supporting requirement of the applicable PRA standard technical element is dependent on the application. In general, the staff