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• Development of a nuclear power plant decommissioning cost estimation program algorithm based on the CANDU structure. • Developed by supplementing the disadvantages of the established nuclear power plant decommissioning cost estimation program, such as repetitive work and difficulty in correcting errors. • Some input items for cost estimation can be automatically entered, and the user can select the desired work object. As part of the safety evaluation during the decommissioning process of Kori Unit 1, candidate scenarios were selected using the risk matrix method. Since Korea has no experience in dismantling commercial nuclear power plants, systematic research on how to select accident scenarios in risk assessment is performed. In this paper, the priority of 11 candidate scenarios selected by the risk matrix method is determined using the AHP method to facilitate the selection of additional scenarios. [ABSTRACT FROM AUTHOR]