Abstract
A safety system is aimed at monitoring the behavior of a process and at preventing severe damage to the process itself and its environment upon occurrence of an incident, du to the propagation of its effects. The paper is devided in three parts. In the first part the functions of a safety systems are stated and the dependability measures for such a system are defined. The second part is firstly devoted to a detailed study of the dependability of a simplex non fault-tolerant safety system, the problems of unrevealed faults and maintenance policy which are of a particular importance are emphized. The results are then used to study the dependability of fault-tolerant safety systems. The third part is devoted to the evaluation of an actual distributed safety system with degraded mode of operation: the control system of the extra high voltage substations of French Electricity network.
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