Document: NUREG-0800
Document ID: e32f0820-4e33-476e-aa36-4ca8c2c64af0
Document Type: srp
Title: Use of Probabilistic Risk Assessment in Plant-Specific, Risk-Informed Decisionmaking:
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0119/ML011940192.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
ashion. For example, individual changes may be grouped together for convenience (ease of implementation and/or review), or changes may be combined as risk tradeoffs (balancing risk increases with risk decreases). Changes grouped in this way should normally be related, for example by affecting the same single system or activity, the same safety function, or the same accident sequence group, or by being of the same type (e.g., changes in AOT). However, this does not preclude unrelated changes from being accepted. When combined change requests are submitted, the staff should conduct a detailed assessment of the relationship between the individual changes and how they have been modeled in the risk assessment. In its review, the staff should evaluate the acceptability of the individual changes and the overall impact of the combined changes with respect to the principles and expectations discussed in Section II of this SRP chapter. Section 111.2.3 discusses the review of combined change requests in more detail. 111.2 Element 2: Conduc:t En-gineering Evaluations In order to make findings regarding the acceptability of a proposed license amendment, the staff should establish its position on the basis of an integrated assessment of traditional engineering evaluations and probabilistic information. Section 2.2 of Reg Guide RG 1.174 describes the specific evaluations that the licensee is expected to perform. The scope and quality of the engineering analyses conducted to justify a proposed change should be appropriate for the nature and scope of that change. Section 3 of RG 1.174 describes the various types of traditional engineering and probabilistic information which should be included in submittals. The results of this element should be reviewed to determine if the submittal satisfies the following principles for risk-informed decisionmaking: the proposed change meets current regulations (unless the change is explicitly related to a requested exemption or rule change); the