衝撃荷重を受ける燃料棒の座屈に関する数値解析

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Nuclear fuel assembly is installed in the cask with the necessary protective function during fuel transportation. The structural integrity of the fuel rods which constitutes fuel assembly has to be evaluated to ensure the safety even for the cask vertical drop accident. The buckling behavior of thin shell tubes by an impact weight have already studied by many researchers experimentally and numerically. However the experiments of irradiated fuel cladding tubes accompany many of difficulties and the number of the experiment is limited. The authors have derived the constitutive relation of the irradiated fuel cladding material, Zircaloy-2, in the previous work and have studied the influences of material properties on the buckling behavior of irradiated fuel cladding tube under the cask drop incident by using finite element simulation code, LS-DYNA. The purpose of this paper is to elucidate the effect of impact velocities, impact mass, boundary conditions and eccentricity of the impact point on the dynamic buckling behavior of the irradiated cladding tube. It is found that the larger impact velocities under the same mass and the smaller impact mass under the same impact energy induce the larger load. The boundary conditions and eccentricities of the impact point have not affected the dynamic buckling load and absorbed energy. However, the deformed shape of the cladding tube is changed largely by the boundary condition. It is also found that the Euler buckling load has possibility to underestimate the dynamic buckling load of the cladding fuel rods.

衝撃荷重を受ける燃料棒の座屈に関する数値解析

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