Abstract
Summary Probabilistic failure analyses of complex installations are usually made for a plant in a steady state. The current techniques are however too limited for non-steady state situations (e.g. in case of start-up of a plant). This paper will present a possible technique for evaluating the safety of a man-machine system that is brought to another state for which procedural actions have to be performed. It consists of combining a method for the identification of the systems states that may occur due to human errors in following the procedure incorrectly and a systems analysis of these system states. An example related to a man-machine system for locking out electrical power for maintenance is presented.
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