This paper presents a user-friendly decision-making support system for a preventive maintenance scheduling. The motivation for the development of the package is to provide KEPCO's working-level experts with a simple and useful tool for gaining a practical maintenance schedule. This MS Windows based program consists of two main modules. The first is an interactive decision-making support module(IDSM). The main objective of this module is to provide various useful text and graphic information to users, and enable practicing engineers with sensitivity analysis of a targeting maintenance schedule. The second is a mathematical optimization module(MOM). In this module, the objective function of levelizing net reserve ratio with daily time-increment is optimized using the relaxation method. The developed package allows automatic data transfer between IDSM and MOM, and easy interaction between input data and maintenance scheduling modules. Therefore, we can establish a practical maintenance scheduling which reflects a mathematical optimization as well as technical/physical constraints adjusted by practicing experts.
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