液体燃料熔盐堆的物理热工特性与固体燃料反应堆有很大的不同,在分析计算中必须考虑燃料流动特性的影响。根据熔盐堆的流动特性,采用多群扩散理论,建立了液体燃料熔盐堆的三维中子动力学模型和流动传热模型,开发了针对液体燃料熔盐堆的三维核热耦合程序,并以此分析了瞬态情况下MOSART堆的物理热工特性。结果表明,堆芯热工参数的瞬态变化会直接影响物理参数的变化,液体熔盐堆具有较明显的温度负反馈特性。 The physical thermal properties of liquid fuel molten salt reactors are very different from those of solid fuel reactors and the effects of fuel flow characteristics must be considered in the analysis and calculation. According to the flow characteristics of molten salt heap, three-dimensional neutron kinetic model and flow heat transfer model of liquid fuel molten salt heap are established based on multi-group diffusion theory. A three-dimensional nuclear thermal coupling program for liquid fuel molten salt heap is developed. In this way, the physical thermal characteristics of the MOSART reactor under transient conditions are analyzed. The results show that the transient changes of the thermal parameters of the core will directly affect the change of the physical parameters, and the liquid molten salt reactor has the obvious negative temperature feedback characteristics.