Logic model needs for diverse facility types

摘要

This paper compares the characteristics of fault trees (where initiators are developed within the fault tree) vs. event trees (where the nodes are developed by fault trees). This comparison requires some additional discussion on the subtlety of initiators. Difficulties when analyzing various reactor-type and processing facilities are discussed to illustrate the particular characteristics of each type of logic. The intent is to allow probabilistic risk assessment (PRA) analysts to be (open quotes)bi-logical,(close quotes) or equally comfortable with event-tree or fault-tree logic, knowing when to apply each.