Abstract
Classical Fault Tree Analysis (FTA) can determine the effects of combinations of failure events on a system but cannot capture the significance of the temporal ordering of events, which may be critical. In this paper, we propose a temporal extension based on formal definition and use of Priority AND gates to allow relative temporal ordering and analysis of temporal relationships in FTA. In this work, the classical notion of minimal cut-sets is replaced with the notion of minimal cut-sequences and a methodology is proposed for qualitative analysis of temporal fault trees and the derivation of minimal cut-sequences. The approach is demonstrated on a generic two stage standby recovery system. The paper tentatively concludes that this type of temporal FTA can provide a more precise and ultimately more correct insight into the failure behaviour of a system.
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