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:
ling, epistemic) being summarized. • Summarize key uncertainties considered in the analysis and any major assumptions, conservatisms, or simplifications that were included and assess (qualitative or quantitative) their effect on the analysis conclusions. O-2A Acceptance criteria met with less than one order of magnitude margin and a strong basis for input distributions and uncertainty classification • See the submittal guidelines for O-1 and provide the reasoning behind a strong basis. O-2B [Acceptance criteria met with less than one order of magnitude margin] and [no strong basis for input distributions or uncertainty classification, or both] • See the submittal guidelines for O-1. • Include a sensitivity analysis (if important inputs are unknown) and sensitivity studies for any inputs that do not have a strong basis. O-3 O-1, O-2A, or O-2B and potential unknowns • See the submittal guidelines for O-1 and provide the reasoning behind a strong basis. • Describe potential unknowns and their possible effect on analysis results. OR • Include a sensitivity analysis (if important inputs are unknown) and sensitivity studies for any inputs that do not have a strong basis. RG 1.245 Revision 0, Page 24 2.11. Sensitivity Studies In most cases, the applicant should perform sensitivity studies to understand how analysis assumptions impact the results of the overall analysis, to show why some assumptions may or may not impact the results, and to understand new and complex codes, models, or phenomena, especially if there are large perceived uncharacterized uncertainties. The applicant should assess its PFM software and analysis to determine the sensitivity studies category shown in Table C-10. The applicant should follow the guidelines in Table C-10 to document the details of sensitivity studies. If the combination of PFM software and analysis belongs to category SS-1 in Table C-10, the staff does not recommend performing sensitivity studies. If the submittal