Title: Concurrent Importance and Sensitivity Analysis Applied to Multiple Fault Trees
Authors: CONTINI SergioFABBRI LucianoMATUZAS VAIDAS
Citation: Reliability, Risk and Safety p. 2072-2080
Publisher: Taylor & Francis Group
Publication Year: 2010
JRC Publication N°: JRC57859
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC57859
Type: Contributions to Conferences
Abstract: Fault-Tree Analysis (FTA) is one of the most popular techniques for studying the system failure states having unacceptable consequences. This model is applied in the design phase to support the designer in producing a system satisfying the safety and availability requirements. In order to help identifying suitable design modifications for complex systems, there is a need to: 1) determine the weakest elements of the system, 2) identify a better design alternative, and 3) evaluate the effect of the adopted solution on system safety / availability. These are the three phases on the Importance and Sensitivity Analysis (ISA) procedure. In actuality, several undesired system states have to be checked for. Therefore, as many fault trees as the number of systems critical states are constructed and analysed, when their occurrence probabilities are deemed not ac-ceptable. This paper describes a novel approach based on ISA aiming at supporting the designer to achieve the objective of obtaining a uniformly protected system satisfying the predefined design goals in a cost-effective manner. It is based on the concurrent analysis of all relevant system¿s fault trees. This approach aims at over-coming the limitations of the current approach, which is based on the sequential analysis of fault trees. In ad-dition, it extends the ISA application also to ¿over-reliable¿ or ¿over-protected¿ system functions on which the reliability/maintainability characteristics of the involved components can be relaxed with consequent cost saving. The paper will describe the basic concepts of the concurrent ISA approach. A simple application ex-ample is added to clarify how the proposed method works.
JRC Institute:Institute for the Protection and Security of the Citizen

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