Document: NRC Regulatory Guide
Document ID: aa450282-f5b0-4dd2-b41a-917a7491deb2
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:
the assumptions and choices made for the most important inputs to confirm their validity. The applicant should also consider the use of sensitivity studies to show the impact (or lack thereof) of some of the key assumptions made for the inputs that are most important to the outcome of the analyses. Table C-4: Categorization Based on Knowledge and the Importance of Inputs Used in the Analysis Input Category Low Knowledge of Input Characteristics High Knowledge of Input Characteristics Deterministic Uncertain Deterministic Uncertain High Importance I-4D I-4R I-3D I-3R Low Importance I-2D I-2R I-1D I-1R For guidance on the documentation of inputs, the applicant should refer to Table C-5. The applicant should provide the information recommended in Table C-5 for each input based on each input’s independent categorization. RG 1.245 Revision 0, Page 17 Table C-5: Submittal Guidelines for Inputs Category Submittal Guidelines I-1D • List input value. I-1R • List input distribution type and parameters, as well as sampling frequency (if applicable). • If applicable, list uncertainty classification (aleatory or epistemic). I-2D • List input value. • If there is a lack of data, justify the use of expert judgment. I-2R • List input distribution type and parameters, as well as sampling frequency (if applicable). • If applicable, list uncertainty classification (aleatory or epistemic). • If there is a lack of data, justify the use of expert judgment. I-3D • List input value. • State the rationale for setting the input to a deterministic value. • For each deterministic input, give the rationale (method and data) for the selection of its numerical value, along with any known conservatisms or non-conservatisms in that numerical value and the rationale for such conservatisms or non-conservatisms. • Reference documents that contain the foundation for input choices. • Explain the correlations between inputs and how they are modeled and verify that correlated