The use of HazOp and Fault Tree techniques for the assessment of non-accident induced release frequencies in the transport of hazardous substances
No well defined methodology is present in the literature for the quantitative risk assessment of non-accident induced releases during the road or rail transport of hazardous substances. The present study was dedicated to the development of a specific technique for the estimation of release frequencies of non-accident induced releases in marshalling yards. The methodology was based on the application of Hazop and Fault Tree techniques to reference schemes for tank-car vessels transporting liquids and liquefied gases. Failure frequencies and uncertainty intervals were thus estimated. The availability of release frequencies made possible the quantitative assessment of the risk caused by this kind of releases. An italian marshalling yards was analyzed. The Aripar-GIS software was used to estimate individual and societal risk caused by the different risk sources. The results pointed out that non-accident induced releases may give a relevant contribution to global risk indexes, in particular if the transport of toxic substances is concerned.
KeywordsHazardous Substance Release Frequency Expected Frequency Rail Transport Failure Frequency
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