3. Build the event tree
As with the fault tree, in hazard studies, the downstream part of the dreaded event is generally represented by a tree structure in which the mitigation barriers are symbolically represented (by a vertical bar that runs counter to the accident sequence). As a result, the tree structure does not correspond strictly speaking to an event tree, since it does not show the different possible consequences depending on whether or not the mitigation barriers are fulfilling their safety function. An example of a simplified representation is shown in the figure "Simplified event tree for the dreaded event: Chlorine leak during wagon unloading".
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Build the event tree
Quantify the bow tie
Bibliography
Also in our database
Bibliography
Yves Mortureux — Fault, cause and event trees — SE 4050
Yves Mortureux — Dependability: risk management methods — BM 5008
Olivier Iddir — The bow tie: a method for quantifying major risk — SE 4055
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