PMID: 11900903Mar 20, 2002Paper

Use of the most likely failure point method for risk estimation and risk uncertainty analysis

Journal of Hazardous Materials
B Mitchell

Abstract

The most likely failure point (MLFP) method, developed within the field of structural reliability analysis (where it is known as the FORM/SORM method) is a technique for estimating the risk (probability) that a calculated quantity Q exceeds a set limit Q(lim) when some or all of the inputs to the calculation are uncertain. It can be used as an efficient stand-alone method for this type of risk calculation. However, for application within the field of toxic hazards, it is proposed as a means for performing sensitivity analyses, possibly in parallel with a risk calculation carried out by conventional methods. The basis of the method is outlined and its use is demonstrated by means of an example calculation of the risk arising from an installation containing chlorine. The calculation uses, as a consequence model, commercial software for the prediction of dense gas transport. The risk estimate is shown to be acceptably close to that obtained by the Monte Carlo method. The use of a proposed screening procedure utilising the sensitivity formulas that the method provides, in order to identify the most significant uncertainties, is demonstrated. The identification of a single set of input values containing sufficient information to sum...Continue Reading

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