YG-1型运输容器跌落分析与结构优化

Dropping Analysis and Structure Optimization of YG-1 Cask

利用ANSYS/LS-DYNA程序进行了YG-1型运输容器9m动态压碎试验的显示动力学分析。根据材料力学试验确定金属材料和非金属材料各项参数,建立合理的有限元模型进行模拟。初步计算结果表明,箱盖上的角钢结构不利于碰撞能量的吸收,导致燃料元件应力过大,不满足ASME规范BPVC-Ⅲ的强度要求。经过对容器防撞结构的重新设计,最终使YG-1型运输容器设计满足ASME规范强度要求。

The dynamic analysis of the YG-1cask of 9 mdropping test was performed using the ANSYS/LS-DYNA code.The finite element model was established based on the non-metallic and metallic material parameters obtained from the experiments,and then the primary design of the cask was numerically investigated.The result shows that the steel frame of the cask does not satisfactorily dissipate the shock energy from the dropping heavy plate,which leads to a large stress in the fuel elements and exceeds the stress intensity limitation of ASME BPVC-Ⅲcriterion.Then,a new design of cask was proposed with improvement of the steel frame.The computation for newly-designed cask illustrates that the steel frame can well dissipate the shock energy.Therefore,the entire cask design satisfactorily meets the requirement of ASME criterion.