Pressure Resistance Thickness of Disposal Containers for Spent Fuel Direct Disposal

A series of structural analyses of disposal containers for the direct disposal of spent fuel was car-ried out to provide preliminary estimates of the required thickness for adequate pressure resistance of the disposal container. Disposal containers were designed to contain either 2, 3 or 4 spent fuel assemblies in linear, triangular or square arrangements, respectively. The required pressure resistance thickness was evaluated using the separation distance of the housing space for each spent fuel assembly as a key model parameter to obtain the required thickness of the body as well as the lid of the disposal container. In this work, we also provide additional technical knowledge on the structural analysis of disposal containers, such as the validity of the setting of the stress evaluation line and the effect of the model length on the analysis. These can then be referred to and used again in the future as a basis for conducting similar evaluations under different conditions or proceeding with more detailed evaluations.