Fault tree analysis initial state

Similar to fault tree analysis, this works from a selected initiating evenF, such as a pressure control failure. It is, basically, a systematic representation of all the possible states of the processing system conditional to the specific initiating event and relevant for a certain type of outcome, e.g. a pollution incident or a major fire. 

A significant development of the study was the use of event trees to link the system fault trees to (lie accident initiators and the core damage states as described in Chapter 3. This was a response to the ditficulties encountered in performing the in-plant analysis by fault trees alone. Nathan Villalva and Winston Little proposed the application of decision trees, which was recognized by Saul Levine a.s providing the structure needed to link accident sequences to equipment failure. 

Thus the initial fault set detected from the thermal domain tree is Qp, Q, R, and P. However, the initial fault hypothesized from the hydraulic domain analysis and. The common hydraulic fault in both these sets is Qp and it too has same qualitative state. The final fault candidate list is Qj, Pj , and P. Since single fault hypothesis is considered, Qp should be the cause of the fault. 

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