On Broadening Failure Rate Distributions in PRA Uncertainty Analyses
作者:
Harry F. Martz,
期刊:
Risk Analysis
(WILEY Available online 1984)
卷期:
Volume 4,
issue 1
页码: 15-23
ISSN:0272-4332
年代: 1984
DOI:10.1111/j.1539-6924.1984.tb00128.x
出版商: Blackwell Publishing Ltd
关键词: Probabilistic risk assessment;uncertainty analysis;prior distributions;population variability curves;broadening failure rate distributions
数据来源: WILEY
摘要:
Several recent nuclear power plant probabilistic risk assessments (PRAs) have utilized broadened Reactor Safety Study (RSS) component failure rate population variability curves to compensate for such things as expert “overvaluation bias” in the estimates upon which the curves are based.A simple two‐components of variation empirical Bayes model is proposed for use in estimating the between‐expert variability curve in the presence of such biases. Under certain conditions this curve is a population variability curve. Comparisons are made with the existing method.The popular procedure appears to be generally much more conservative than the empirical Bayes method in removing such biases. In one case the broadened curve based on the popular method is more than two orders of magnitude broader than the empirical Bayes curve. In another case it is found that the maximum justifiable degree of broadening of the RSS curve is to increase α from 5% to 12%, which is significantly less than the 20% value recommended in the popular
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