A MAUT approach for selecting a dismantling scenario for the thermal column in KRR-1

In this paper, an evaluation methodology for selecting an optimal dismantling scenario at the stage of a decommissioning planning is presented. The selection of a dismantling scenario is critical for an entire decommissioning project because by the selected dismantling scenario, the dismantling schedule, the dismantling cost, a worker’s exposure, and the work safety level are determined. So it is necessary that an optimal scenario for dismantling an object is selected through an evaluation of the relevant scenarios in consideration of several evaluation items. In this research, as an evaluation model, the multi-attribute utility theory (MAUT) is quantitatively and qualitatively applied to assess these scenarios. Quantification of an evaluation item in the MAUT method has been performed by using a single utility function as well as a multi-utility function for each item. As an implementation, the MAUT method is applied to select the best scenario for the thermal column in Korea Research Reactor-1 (KRR-1) and its advantages and disadvantages compared with the (analytic hierarchy process) AHP method about the application to a decommissioning project.