Measures of Risk Importance and Their Applications (NUREG/CR-3385, BMI-2103)

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Publication Information

Manuscript Completed: March 1983
Date Published: July 1983

Prepared by:
W.E. Vesely, T.C. Davis, R.S. Denning, N. Saltos
Battelle Columbus Laboratories
505 King Avenue
Columbus, Ohio 43201

Prepared for:
Division of Risk Analysis
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

NRC FIN B-2386

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Abstract

The objectives of this work are to evaluate the importance of the containment and the different safety functions as assessed in probabilistic risk-analyses. To accomplish this objective, risk importance measures are defined to evaluate a feature's importance in further reducing the risk and its, importance in maintaining the present risk level. One defined importance measure, called the feature's risk reduction worth, is useful for prioritizing feature improvements which can most reduce the risk. The other defined importance, called the feature's risk achievement worth, is useful for prioritizing features which are most important in reliability assurance and maintenance activities.