Abstract
This paper deals with the important problem of the impact of human errors on nuclear reactor operation. Human malfunctions are classified according to a taxonomy developed from a consideration of real records of incidents. Two main roles have been ascertained for the operator actions: controlling incident development, and carrying out test and maintenance procedures. Two different models have therefore been set up: a dynamic model which allows identification of critical timings of operator intervention and recovery, and a static model which takes care of the dependence structure of the various steps in maintenance and test procedures. These models may be used in “a priori” risk assessment, and also for optimization of procedures and the man-machine interface.
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