Abstract
α-radiolysis could affect the dissolution behaviour of used UO 2 fuel. To model this effect, one must first determine the α-radiation dose absorbed by the water near the fuel surface, e.g. in fuel cracks. This is the purpose of our paper. First, using the actinide inventories of used UO 2 fuel, we calculate the number and energies of the α-particles created in various used fuels. However, the α-particles created in the fuel deposit a large fraction of their energy in the fuel matrix before reaching the fuel surface. In this paper, we show that the self-shielding by the surface layer of the fuel reduces the α-particle dose rate at the fuel surface by about a factor of seven.
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