Document: NUREG-0800
Document ID: ac43f632-9db1-4857-9f56-bfba45965456
Document Type: srp
Title: * These are modifications to a plant’s design, operations, or other activities that require NRC approval. These modifica
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0232/ML023250195.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19
CFR Part: 
CFR Title: 

Content:
nty is given in analyses and interpretation of findings, including using a program of monitoring, feedback, and corrective action to address significant uncertainties. [Sections III.2.2 and III.3] • The use of core damage frequency (CDF) and large early release frequency (LERF) as bases for probabilistic risk assessment guidelines is an acceptable approach to addressing Principle 4. Use of the Commission's Safety Goal quantitative health objectives (QHOs) in lieu of LERF is acceptable in principle and licensees may propose their use. However, in practice, implementing such an approach would require an extension to a Level 3 PRA, in which case the methods and assumptions used in the Level 3 analysis, and associated uncertainties, would require additional attention. [Section III.2.2] • Increases in estimated CDF and LERF resulting from proposed LB changes will be limited to small increments. The cumulative effect of such changes should be tracked and considered in the decision process. [Section III.2.2] • The acceptability of the proposed changes should be evaluated by the licensee in an integrated fashion that ensures that all principles are met. [Section III.2.3] • Data, methods, and assessment criteria used to support regulatory decisionmaking must be well documented and available for public review. [Section III.4] III. REVIEW GUIDANCE AND PROCEDURES SRP 19-7 For risk-informed applications, reviewers should ensure that licensees’ submittals meet the principles specified in Section II of this SRP chapter and address the expectations for risk-informed decisionmaking (also specified in Section II). This section provides guidance to assist reviewers in making this determination. For consistency, Sections III.1 through III.4 present this guidance in terms of the four elements of the approach described in Section 2 of Regulatory Guide 1.174 (Ref. 4). III.1 Element 1: Define the Proposed Change In this element, reviewers should verify that the submittal provides