Abstract
The common cause failures (ccf) are the biggest part when calculating the probability of failure for redundant safety integrity systems. A ccf can occur, when a random hardware failure leads to a failure of several components. There are several methods to calculate the probability of ccf. Three models will be shown in this paper, with the help of which the beta-factor will be calculated. The ccf ratio for the calculation of the overall probability of failure is defined with the beta-factor.
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