Study of the Application of LOPA in Risk Assessment of Multi-initiating Events

There are some defects when dealing some types of complex accident scenes which using LOPA as the strict definition of independent protection layer limits its application scope. The purpose of this paper is aimed at the accident scenarios where multi-initiating event trigger a single accident consequence, putting forward strategy of selecting the aggregation method and the maximum screening method, so that the effectiveness of LOPA applying in such accident scenarios can be expanded. Meanwhile, for the condition that the passive protective layer is not completely effective in the accident scenarios, consequence reduction coefficient is introduced in and correctional program based on accident consequence is presented. All these work is to make the accident frequency calculation results closer to its actual value and finally enhance the accuracy of LOPA analysis.