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However, in the context of fault and event trees and thenotion of ‘defence in depth’, the barrier concept has beenstretched comprising also barriers that in themselves cannotprotect the target from the hazard, but are part of a wholeset of measures that together represent the classical barrierconcept of the MORT tree. Hence, between the hazard andthe target many ‘barriers’ are put that together should preventthe hazard from damaging the target, i.e. ‘defence in depth’.In such a series, many barriers are not so much concernedwith actual hazards but with occurrences or events that mightlead to some sort of loss of control and, in the long run,the unwanted release of a hazardous energy source. Barrierstherefore have different functions, based on their location inthe fault tree (or event tree).
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