Abstract
AbstractThe safety index is proposed as an index for system reliability. In order to determine this index, the tree analysis for safety (TAS) must be constructed for the individual system. This paper focuses on the hazard source of the fault analysis (FA) system and discusses a method to construct standard TAS, which is independent of the system configuration of the FA system. As a first step, the hazard sources of the FA system are divided into two classes. One is the class in which the existence of the hazard source itself is the problem, and the source must be deleted from the viewpoint of safety (explicit hazard source). the other is the class where the hazard source is indispensable to the FA system; however, a serious event may be produced if an explicit hazard source is generated (potential hazard source). the case where the potential hazard source in the FA system induces an accident is defined as the standard model. the standard TAS is constructed. By providing a selection branch at the lowest level node of TAS, a TAS aligned to the checklist is constructed. By those approaches, it is made possible that a beginner unfamiliar with TAS can determine the safety index. In other words, the safety index is now a useful criterion for the safety evaluation of the FA system.
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