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:
ugh the PFM model such that analysis results may be reproduced. The applicant should determine the PFM analysis uncertainty propagation category, as shown in Table C-6. The applicant should follow the guidelines in Table C-6 to document how uncertainties are propagated in the PFM analysis. If the submittal presents several analyses, the applicant should determine the category for each analysis and document the uncertainty propagation for each analysis according to the guidelines in Table C-6. Table C-6: Submittal Guidelines for Uncertainty Propagation Category Description Submittal Guidelines UP-1 Analysis does not employ a surrogate model • Give the method for uncertainty propagation and describe the simulation framework. • If Monte Carlo sampling is used, describe the finalized sampling scheme and rationale for the sampling scheme, including sampling method, sample size, the pseudo-random number generation method, and the random seeds used. • Describe the approach for maintaining separation of aleatory and epistemic uncertainties, if applicable. • If importance sampling is used to oversample important regions of the input space, justify the choice of importance distribution. UP-2 Analysis does employ a surrogate model • See the submittal guidelines for UP-1 and describe the form of the surrogate model(s), any approximations or assumptions, the method used for fitting the surrogate, and the validation process for the surrogate model. UP-2A Surrogate model used for sensitivity analysis • See the submittal guidelines for UP-2 and describe the features of the different surrogate models used. UP-2B Surrogate model is used for uncertainty propagation • See the submittal guidelines for UP-2 and quantify the magnitude of error associated with the surrogate model approximation and include as additional uncertainty in the estimation of the QoI. RG 1.245 Revision 0, Page 19 2.8. Convergence To assess the convergence of the QoI estimate, the applicant’s