Abstract
The assessment of operator actions within the scope of probabilistic risk analyses is an important task; however, it is connected with considerable uncertainties. The aim of the expert system ESAP (an easy-to-use expert system for the systematic analysis of operator actions within the scope of probabilistic risk assessment) is the reduction of those uncertainties caused by subjectivities in using the technique of human error rate prediction (THERP) methodology. The transformation of THERP using the expert system shell knowledge engineering environment (KEE) and the input logic are briefly described as well as the calculation of error probabilities using KEE rules. The advantages of ESAP and further developments are summarised.
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