三维燃料棒精细化模拟软件FUPAC3D与FUPAC的对比验证研究

Comparative Validation of Three Dimensional Fuel Rod Fine Simulation Software FUPAC3D and FUPAC

为验证基于三维有限元分析平台建立的三维燃料棒精细化模拟软件FUPAC3D在分析评价压水堆燃料棒辐照-热-力耦合行为方面的能力和精度,本文给出了三维FUPAC3D软件采用的热学模型、燃料棒力学模型、裂变气体释放模型以及腐蚀模型,以华龙一号典型燃料棒参数和运行工况作为输入参数,分别使用三维FUPAC3D软件和已工程化应用的1.5维FUPAC软件进行建模分析,并针对2种软件在芯块和包壳温度、包壳应力与应变、芯块与包壳间间隙宽度的计算结果进行对比研究。研究结果表明,FUPAC3D软件与FUPAC软件具有相当的精度,FUPAC3D软件具备压水堆燃料棒辐照-热-力耦合行为的精细化模拟能力。

To verify the function and accuracy of the three-dimensional fuel rod fine simulation software FUPAC3D based on the three-dimensional finite element analysis platform in analyzing and evaluating the radiation-thermal-mechanical coupling behavior of PWR fuel rods,in this paper,the thermal model,fuel rod mechanical model,fission gas release model and corrosion model adopted by the three-dimensional FUPAC3D software are given.Taking the typical fuel rod parameters and operating conditions of HPR1000 as input parameters,the three-dimensional FUPAC3D software and the 1.5-dimensional FUPAC software that has been applied in engineering are used for modeling and analysis.The calculation results of two kinds of software in the temperature of pellet and cladding,the stress and strain of cladding,and the gap width between pellet and cladding are compared.The results show that FUPAC3D software and FUPAC software have considerable accuracy,and FUPAC3D software has the fine ability to simulate the radiation-thermal-mechanical coupling behavior of PWR fuel rods.