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在自然循环过渡过程模拟实验中，真实地模拟反应堆堆芯及其控制系统是十分重要的。本文着重叙述了仿真堆芯的中子动力学模型和热工水力学模拟，并用 RETRAN程序的计算结果对模型及其相应程序进行了验证，获得了满意的结果。
In the simulation of natural circulation transition process, it is very important to simulate the reactor core and its control system. In this paper, the neutron kinetic model and thermal-hydraulic simulation of the simulation core are emphatically described. The model and its corresponding program are verified by the calculation results of RETRAN program, and satisfactory results are obtained.