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Finite element method (FEM) modeling of the volumetric expansion phenomenonassociated with the accumulation of irradiation was performed on rocks in aconcrete for nuclear power plant. The FEM mesh of sandstone, tuff, and granitewas created based on microscopic images, and the volumetric expansion due toirradiation was calculated. The saturated value of the volume expansion due toirradiation accumulation was calculated, and it was shown that the saturatedvalue of the volume expansion was well explained by the experimental value. Inaddition, the FEM analysis indicates that irradiation-induced degradation ofrock propagates through a localized concentration of stress followed byfracture with cracks spreading throughout the rock.

Finite element method modeling of expansion of irradiated rocks: focusing on the minerals