Document: NUREG-0800
Document ID: b8d2b8f5-432a-4c0a-81ab-20231f7d0f28
Document Type: srp
Title: PROBABILISTIC RISK ASSESSMENT AND SEVERE ACCIDENT EVALUATION FOR
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1508/ML15089A068.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
plant applications should be satisfied consistent with the clarifications and qualifications of RG 1.200. Determine if the process used to determine basic event probabilities is reasonable. Check the assumptions made in calculating the probabilities of basic events (unavailabilities). Confirm that the data used in the PRA are appropriate for the hardware and software version being modeled, or that adequate justification is provided. Note that a fault-tolerant feature of a DI&C system (or one of its components) can be explicitly included either in the logic model or in the probabilistic data of the components in the model. It should not be included in both because this would result in double-counting the feature’s contribution. H. If the values of the data used appear to be skewed and use of different values might change the insights drawn from the DI&C risk assessment, confirm that the data meet the following criteria: a. The data are obtained from the operating experience of the same equipment as that being evaluated, and preferably in the same or similar applications and operating environment. Uncertainty bounds should appropriately reflect the level of uncertainty. (Applies to both component- specific and generic data) 19.0-32 Revision 3 – December 2015 b. The sources for raw data or generic databases are provided. (Applies to both component-specific and generic data) c. The method used in estimating the parameters is documented, so that the results can be reproduced. (Applies to component specific data) d. If the system being modeled is qualified for its environment but the data obtained are not drawn from systems qualified for that environment, the data should account for the differences in application environments. (Applies to both component-specific and generic data) e. Data for CCF meet the above criteria in Ha to Hd. (Applies to both component-specific and generic data, as appropriate) f. Data for fault coverage meet the above criteria in Ha to Hd.