ABSTRACT:At present,the modular simulation techniques of the second loop in nuclear reactor system have been mature,while the primary loop can not be fully modular simulated.By using the THEATRe software running on the SimExec platform,taking the Qinshan phase I NPP as the simulation object,a coolant system model can be established,the errors can be controlled within 0.5%;Modular simulating the natural circulation steam generator,then coupled the SG with the primary loop,the distinctions between the modular system with the former system are no more than 1%;Comparing the transient characteristics of the modular model with that of the former loop model by ascending the power transiently,ultimately draw a conclusion on the focus whether the modular simulation techniques of the SG in the primary loop is feasible,and thus give suggestions on improvements and recommendations of the modular simulation methods.%目前对于核电站系统二回路的模块化仿真建模技术已较为成熟，而一回路还未完全实现模块化。利用运行在SimExec平台上的THEATRe软件，以秦山一期核电站为仿真对象，建立冷却剂系统仿真模型，进而对模型进行仿真研究，误差可控制在0.5%以内；将主回路中的自然循环蒸汽发生器进行模块化建模，并通过方案优化，采用边界交换的方法将蒸汽发生器模块与系统主回路进行耦合，耦合前后系统运行参数误差不超过1%；通过瞬态提升功率比较模块化模型与环路模型的瞬态特性，最终得出对自然循环蒸汽发生器进行模块化建模仿真方法可行的结论，并由此提出改进方法及其在实际建模仿真中的建议。
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