A fault tree built on a past accident shows that many events took part in it: they can be examined separately as such, i.e. without the tree they are hanging on. After coding those events (this being the main difficulty), the calculations be methods of factorial analysis determine the relationships between the different modalities of the chosen criteria: the most efficient prevention actions may be inferred. We give an example based on twenty accidents during ordinary work and another example based on forty six incidents at units using inflammable fluids for heat transfer.
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