Document: NRC Regulatory Guide
Document ID: cde52d5a-adf9-49be-9d1f-59449dfca895
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
ation of a mean hazard curve from the family of hazard curves obtained. The characteristics and attributes needed to achieve the objectives of the high wind hazard analysis PRA analysis element are as follows: • A probabilistic wind hazard analysis— o results in frequency of high wind at the site, o is based on site-specific data, and o reflects recent information. • Uncertainties in the models and parameter values— o are properly accounted for, o are fully propagated, and o allow estimate of the mean hazard curve. The objective of a high wind fragility analysis is to estimate plant-specific, realistic wind fragilities for those SSCs (or their combination) whose failure contributes to plant risk or radiological consequences. The characteristics and attributes needed to achieve the objectives of high wind fragility analysis are as follows: • The analysis is plant-specific. • The analysis is realistic. • All SSCs whose failure contributes to core damage or large early release are included. • The analysis is confirmed through plant walkdowns or by evaluating available data and findings of investigations of the plant design and operations information for plants that have not started construction or do not have enough construction completed to allow physical walkdowns. • The uncertainties related to the high wind fragility analysis are identified and characterized. The objective of a high wind plant response analysis is to develop a high wind PRA systems model that includes all significant high-wind-induced initiating events and other failures that can lead to plant risk or radiological consequences. The model is adapted from the internal events model to incorporate unique high wind analysis aspects that are different from those in the internal events PRA model. The characteristics and attributes needed to achieve the objectives of high wind plant response analysis PRA analysis element are as follows: • All significant high-wind-induced initiating