速率理论在核燃料模拟计算中的应用现状与展望

Status and Prospect of Rate Theory in Nuclear Fuel Simulation

速率理论是一种先进的模拟核燃料机理行为的途径。通过建立微观尺度下的原子和晶体缺陷的速率方程,求解原子和缺陷浓度方程,模拟核燃料的裂变产物和缺陷的行为,计算核燃料的裂变气体释放率、包壳空洞肿胀速率和辐照生长应变率等与反应堆安全密切相关的物理量。介绍了速率理论在核燃料模拟计算中的应用,对比了国际上速率理论在核燃料模拟计算中的发展现状,分析了速率理论在模拟中存在的缺点和不足,在此基础上对速率理论在核燃料性能分析领域的发展前景和研究方向进行了展望。

Rate theory is an important approach to simulate the behavior of nuclear fuel.The fission products and defects behavior are modeled by establishing the rate equations and solving the concentration equations of atoms and defects in microscopic scale.The fission gas release rate of nuclear fuel,cladding irradiation swelling rate,irradiation-induced growth rate,and physical characteristics which are closely related to the safety of the reactor,are also calculated.First,the rate theory and its application in nuclear fuel simulation are introduced,and the development status both in domestic and aboard are compared.Then,the disadvantages and inadequacies of the rate theory in simulation are analyzed.Finally,the future development and research direction of the rate theory in nuclear fuel performance are discussed.