Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
(e.g., they may not include contributions from external initiating events or low-power and shutdown (LPSD) modes of operation). Those RGs do, however, state that the missing PRA scope items are to be addressed in some way, such as using bounding analyses to justify excluding missing PRA scope items, or by limiting the scope of the application. This RG is a supporting document to other NRC regulatory guides that address risk-informed activities. Other application-specific RGs provide guidance on how the base PRA can be used in the decision under consideration. As such, other regulatory guides refer to RG 1.200 in order to ensure the acceptability of the base PRA, from which the application-specific PRA is derived. PRA acceptability for a given risk-informed activity is determined considering the staff positions in this RG, staff positions in relevant application-specific regulatory guidance and any related requirements (e.g., license condition) for the application. Examples of application-specific regulatory guidance documents include (1) RG 1.174 and NUREG-0800, Section 19.2, “Review of Risk Information Used to Support Permanent Plant-Specific Changes to the Licensing Basis: General Guidance” (Ref. 28), which provide general guidance on applications that address changes to the licensing basis; (2) application-specific RGs such as RG 1.175, RG 1.177, and RG 1.178; and (3) RGs associated with implementation of certain regulations, such as RG 1.201, particularly those that rely on a plant-specific PRA to implement the rule (e.g., 10 CFR Part 52). Figure 2 illustrates the relationship of RG 1.200 to some examples of risk-informed activities, application-specific guidance (e.g., RG 1.174), national consensus PRA standards, and industry programs. DG-1362, Page 9 Figure 2. Relationship of Regulatory Guide 1.200 to other risk-informed guidance Regulatory guides addressing specific applications, such as RG 1.201, allow for the use of PRAs that are not full-scope (e.g.,