中文摘要：

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，一般分析固体反应堆的程序均不能直接用于分析液体燃料熔盐堆。根据熔盐堆的流动特性，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稳态核热耦合程序，并以此分析了稳态情况下MOSART堆的物理热工特性。结果表明，堆芯流速对快中子和热中子影响较小，对堆芯温度和缓发中子分布影响较大。

英文摘要：

The physics properties and thermal-hydraulic characteristics of liquid-fuel molten salt reactor are different to that of solid fuel reactor ,and the effect of liquid fuel flow must be considered w hen the analysis code used in solid fuel reactor analysis will no longer be directly applied .Considering the fuel flow effect of the reactor ,the neutron dynamic model based on particle conservation equation coupled with molten salt fuel flow and heat transfer models was derived and a three-dimensional neutronics/thermal-hydraulics coupled code was developed .The physics and thermal-hydraulic characteris-tics of MOSART in steady state were studied .The calculation results indicate that the fuel flow has minor effect on neutron distribution , but major effects on the delayed neutron distribution and temperature distribution in the core .