UMo-Zr单片式燃料板结构改进研究

基于有限元分析软件ABAQUS将燃料包壳和芯体的辐照-热-力本构关系引入数值模拟计算，初步建立了UMo-Zr单片式燃料板堆内热力行为的模拟方法。基于该数值模拟方法，针对均匀辐照的工况，通过改变燃料芯体长度、宽度、厚度3个方向的尺寸和边角的形状，研究芯体结构对辐照后温度场和应力场的影响。研究结果表明，辐照后的温度场和应力场对芯体厚度方向的尺寸变化最敏感；对芯体边角处进行倒角处理能够减小辐照后的米塞斯（MISES）应力峰值。 

Structural Improvement of UMo-Zr Monolithic Fuel Plates

In this study, the in-pile thermo-mechanical constitutive relation of fuel pellet and cladding was introduced into the numerical simulation based on ABAQUS, and the method of numerical simulation of the in-pile behavior of the UMo-Zr monolithic fuel plate was preliminarily established. Based on the method of numerical simulation, the effect of fuel pellet structure on the temperature field and stress field was analyzed by changing the length, the width, and the thickness of the fuel pellet and the shape of the edges. The research results indicated that the temperature field and stress field in the post-irradiation fuel pellet were sensitive to the thickness of the fuel pellet; the peak Mises stress in the post-irradiation fuel pellet was decreased by chamfering the fuel pellet.