Document: NRC Regulatory Guide
Document ID: e0d690ec-277f-4fe2-b92f-7f95d0f589a7
Document Type: regulatory_guide
Title: Preparing Probabilistic Fracture Mechanics (Rev. 0)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2133/ML21334A158.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.245
CFR Part: 
CFR Title: 

Content:
selection, including the sampling technique, number of model realizations, and random seed for the model realizations. • Provide the results of the sensitivity analysis, including the most important model inputs identified; a measure of the input importance, such as the variance explained by the most important inputs; and relevant graphical summaries of the sensitivity analysis results. SA-3 Modified approved code (QV- 1C) with limited independent variables (e.g., <5, determined on a case-by-case basis) Yes • Describe analyses, important input, and measure of input importance. SA-4 Modified approved code (QV- 1C) with many independent variables (e.g., >5, determined on a case-by-case basis) Yes • See the submittal guidelines for SA-2. SA-5 First-of-a-kind code (QV-2, QV-3) with limited independent variables (e.g., <5, determined on a case-by-case basis) Yes • See the submittal guidelines for SA-3. SA-6 First-of-a-kind code (QV-2, QV-3) with many independent variables (e.g., >5, determined on a case-by-case basis) Yes, with sub- model SA as appropriate • See the submittal guidelines for SA-2. • Indicate how the sensitivity analysis results informed future uncertainty propagation for estimation of the QoI and associated uncertainty. • State whether the results of the sensitivity analysis are consistent with the expected important inputs based on expert judgment. a Local sensitivity analysis may be used as a screening step if completing a global sensitivity analysis with all inputs is not computationally feasible (as the cost of performing a global sensitivity analysis increases with the number of inputs). The results from local sensitivity analysis can help reduce the input space for a global sensitivity analysis, but local sensitivity analysis does have its risks in that it can miss important inputs if the input/output relationship is nonlinear. Sensitivity analysis should be performed unless there is a strong basis for what inputs are important (e.g.,