Disposal Container Concepts and Disposal Effectiveness Analyses According to the Spent Fuel Cooling Time for a Deep Geological Repository

A deep geological repository concept for the disposal of spent fuels from reactors involves emplacing heatgenerating disposal containers with spent fuels at a depth between 500 to 1000 m in a plutonic rock mass. Extremely high and long-time scale radioactivity of them led to the idea of deep geological repositories in stable geological formations. The objective is to isolate the spent fuels from the biosphere for as long as they could be harmful to the people's health and the environment Further delaying the spent fuels disposal results in a further decay of the radioactivity, in turn, reducing the intensity of the heat source of the waste. In this study, based on the reference disposal concept which has been developed, to improve the disposal density, the correlations between spent fuel cooling times and the heat capacity of a disposal container satisfying the thermal requirement were reviewed. From this review, the concepts of a disposal container were proposed. According to the concepts of the disposal container, the effectiveness of the repository such as the area and disposal density was analyzed. The results of this study can be used in the design of a deep geological disposal system for a high level radioactive waste