Abstract
This paper analyses probabilistic properties of an alarm subsystem, where the following two kinds of human interface configurations are distinguished: (1) fault-alerting configuration and (2) safety-presentation configuration. The latter configuration requires safety-control policies to be classified into fault-warning safety-control policies and safety-preservation safety-control policies. We investigate time-dependent characteristics of probabilities that an alarm subsystem causes spurious shutdowns (SS) and hazardous accidents (HA) for the plant. We prove that the safety-presentation alarm subsystem with safety-preservation safety-control policy can be optimal, in a certain time interval, in the sense that it minimizes SS and HA failure probabilities simultaneously. We prove also that the safety-presentation alarm subsystem with fault-warning safety-control policy can be optimal at any time point.
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