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:
are satisfied, the staff should normally be able to reach such a finding for the proposed change. SRP 19-29 Table I11-1 (page 1 of 3) Questions to Assist in Establishing the Cause-Effect Relationship4 LEVEL 1 (INTERNAL EVENTS PRA) Initiating Events * Does the application iritroduce new initiating events? * Does the application address changes that lead to a modification of the initiating event groups? * Does the application necessitate reassessment of the frequencies of the initiating event groups? * Does the application increase the likelihood of a system failure that was bounded by an initiating event group to the extent that it needs to be explicitly considered? Success Criteria Does the application necessitate modification of the success criteria? Does the modification of success criteria necessitate changes in other criteria, such as system interdependencies? Event Trees • Does the application adc ress an issue that can be associated with a particular branch, or branches on the event trees, and if so, is the branching structure adequate? * Does the application necessitate the introduction of new branches or top events to represent concerns not addressed in the event trees? * Does the application necessitate consideration of reordering branch points (i.e., does the application affect the sequence-dependent failIjre analysis)? System Reliability Models Does the application impact system design in such a way as to alter system reliability models? Does the application impact the support functions of the system in such a way as to alter the dependencies in the model? Does the application irripact the system performance and, if so, is that impact obscured by conservative modeling techniques? Parameter Database Can the application be clearly associated with one or more of the basic event definitions, or does it necessitate new basic events? * Does the application necessitate a specialized probability model (e.g., time-dependent model, etc.)? * Does the application