Review of the cost estimation in nuclear power plant decommissioning and proposal of the cost estimation methodology for kori unit 1

Abstract

order to decommissioning a nuclear power plant, a decommissioning plan must be prepared in accordance with the relevant laws and regulations. According to the nuclear safety regulations of Korea in Chapter 2 of the decommissioning plan, the project management part should quantitatively evaluate the cost required for decommissioning a nuclear power facility by considering the characteristics of the facility and the site. However, since there is no guideline for quantitative evaluation method, a domestic decommissioning cost evaluation system was established by investigating the AIF/NESP-036 guidelines, which provide a standardized cost evaluation framework in the field of NPP decommissioning, and overseas cost evaluation cases. The decommissioning cost evaluation items were classified into three cost categories: activity-dependent cost, period-dependent cost and collateral cost, and the application cases of contingency for each sub-item of the cost category was analyzed to establish the criteria for applying contingency for each domestic decommissioning cost item. In addition, the Work Breakdown Structure (WBS) and Unit Cost Factor (UCF) based bottom-up cost estimation method presented in the AIF/NESP-036 were actually applied to domestic NPP, and the evaluation results were presented in this paper. Based on this, we established a cost evaluation system, which is expected to be used as a methodology for evaluating decommissioning costs, and important project management factor in the preparation of decommissioning projects.