FCM燃料辐照-热-力耦合性能数值研究

Numerical Research on Irradiation-Thermal-Mechanical Coupling Behavior of FCM Fuel

使用ABAQUS软件编写相应的用户自定义子程序,初步建立了全陶瓷微封装燃料(FCM)的辐照-热-力耦合性能模拟方法,采用该数值方法对TRISO燃料球的堆内性能进行了模拟,并与程序BISON计算结果进行对比,验证了该模拟方法的有效性。同时,对FCM燃料的辐照-热-力耦合性能进行了数值模拟,结果表明,FCM燃料芯块的温度分布与力学分布均表现出较强的非均匀性,裂变气体释放对于FCM燃料的性能影响较大,FCM燃料内包覆层的环向应力与FCM芯块温度变化对于功率瞬态并不敏感。

User defined subroutines were coded under the calculation frame of ABAQUS software, and then, the irradiation-thermal-mechanical coupling behavior simulation method of fully ceramic micro-capsuled(FCM) fuel was preliminary established. With this simulation method, the in-pile behaviors of TRISO particle were modeled. Compared with the BISON calculation results, the validity of this simulation method was tested. Subsequently, the irradiation-thermal-mechanical coupling behavior of FCM fuel was modeled. The simulation results showed that the temperature distribution and stress distribution of FCM fuel exhibited a strong non-uniformity. The fission gas release had a strong effect on the mechanical performance of FCM fuel. The hoop stresses and temperature distribution of FCM fuel were not sensitive to transient power increasing.