FULLY CERAMIC CAPSULATED NUCLEAR FUEL COMPOSITION CONTAINING THREE-LAYER-STRUCTURED ISOTROPIC NUCLEAR FUEL PARTICLES WITH COATING LAYER HAVING HIGHER SHRINKAGE THAN MATRIX, MATERIAL THEREOF AND METHOD FOR PREPARING THE SAME

摘要

The present invention relates to a method for preparing a fully ceramic capsulated nuclear fuel material containing three-layer-structured isotropic nuclear fuel particles coated with a ceramic having a composition which has a higher shrinkage than a matrix in order to prevent cracking of ceramic nuclear fuel, wherein the three-layer-structured nuclear fuel particles before coating is included in the range of between 5 and 40 fractions by volume based on after sintering. More specifically, the present invention provides a composition for preparing a fully ceramic capsulated nuclear fuel containing three-layer-structured isotropic particles coated with the substance which includes, as a main ingredient, a silicon carbine derived from a precursor of the silicon carbide wherein a condition of ΔL_cΔL_m at normal pressure sintering is created, where the sintering shrinkage of the coating layer of the three-layer-structured isotropic nuclear fuel particles is ΔL_c and the sintering shrinkage of the silicon carbide matrix is ΔL_m; material produced therefrom; and a method for manufacturing the material. The residual porosity of the fully ceramic capsulated nuclear fuel material is 4% or less.