中文摘要：

针对美国橡树岭国家实验室（ORNL）熔盐堆（MSR）实验的堆芯设计，采用物理分析程序MCNP进行三维堆芯功率分布计算。针对以石墨作为慢化剂的堆芯结构，开发了并联多通道程序来进行堆芯热工水力分析。在此基础上，把物理和热工分析程序进行耦合，用ORNL技术报告中的相关内容来验证物理一热工耦合分析的可行性和准确性。结果表明，本工作的耦合计算方法可获得熔盐堆堆芯功率分布、温度分布、压降和流量分配。熔盐堆耦合程序的研发对熔盐堆概念设计、运行分析有重要意义。

英文摘要：

The three-dimensional power distribution of the molten salt reactor （MSR） designed by Oak Ridge National Laboratory （ORNL） was analyzed by using MCNP code. Besides, a multiple-channel analysis code （MAC） was developed for the special geometry of graphite moderator design and coupled with MCNP code to analyze the neuron behavior as well as thermal-hydraulics of MSR experiment. The feasibility and accuracy of the analysis with coupled neutronics/thermal-hydraulics were validated by relevant results from the ORNL technical report. The results show that the coupling method can obtain accurately the power distribution, temperature distribution, pressure drop and mass flow distribution. This work is helpful for further design analysis andoperation of MSR.