Study on probabilistic safety assessment in decommissioning of nuclear power plant

Abstract The decommissioning of Nuclear power plant involves many activities different from the normal operation stage of Nuclear power plant. In the process of decommissioning, there are many new safety problems, which usually require new safety evaluation. The safety management of decommissioning runs through the whole decommissioning stage until the decommissioning of the plant site is completed. The management level depends on the risk level of each stage of decommissioning, especially the decommissioning process of high radioactivity in nuclear power plant, so it is necessary to pay attention to the risk of different stages of decommissioning and improve the decommissioning safety management. At present, probabilistic safety assessment method has become an effective tool to support and supplement deterministic safety assessment, and is used in regulatory activities. The safety risk analysis of nuclear power plant in the decommissioning stage in China is in the initial stage, with little experience. Therefore, it is necessary to study the corresponding technical methods and risk management applications. This paper study on the probabilistic safety assessment in the decommissioning of nuclear power plant, including its scope of application, risk-informed assessment method and safety management application. The probabilistic safety assessment of decommissioning of nuclear power plant is an effective means to evaluate the potential risks related to decommissioning activities and their possible consequences. This method can be used for safety review and safety management in the decommissioning stage of nuclear power plant.