Developing risk breakdown structure for nuclear power plant decommissioning projects in Korea focusing on radioactive concrete dismantle

Nuclear power plants (NPP) that prepare for dismantling under permanent suspension due to end of designed life or environmental problems are increasing worldwide. In NPP decommissioning work, structural and job risk analysis and management, taking into account the characteristics of radioactive contamination, are critical because they are directly related to workers' safety. However, structural disasters and job risk factors that may occur during the decommissioning work are not addressed large compared to the risk of dismantling facilities such as nuclear reactor dismantling. For this reason, structural disasters and workers' job risks that may be caused by disasters are not systematically established. The structural and job risk and the breakdown structure are not classified according to the specified dismantling work characteristics, so it is difficult to use it for risk analysis for actual dismantling work. It is also difficult to characterize NPP decommissioning due to not sophisticated work breakdown structure (WBS). Therefore, the purpose of this study is to establish a risk breakdown structure (RBS) that reflects the characteristics of the NPP dismantling work according to structural/job as a primary step for risk analysis and management. To this end, we will analyze each work's risk factors based on similarity to the construction dismantling work targeting the cutting work when dismantling the radioactive concrete structure, which has the most significant risk and derives the risk factors by matching them with structural and human damage factors. The RBS model established as a result of the study is expected to be used as primary data for risk analysis and the safety evaluation of NPP dismantling works in the future.