Application of Nonlinear Iteration Method in Reactor Real-Time Simulation
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摘要: 在核电厂全范围仿真机开发过程中,针对反应堆功率三维分布计算的高精度与实时性难以兼顾问题,采用非线性迭代法(NIM)作为迭代策略,利用节块展开法(NEM)计算耦合修正因子,用以校正粗网有限差分法(CMFD),并编制了相应的计算程序。经过典型基准算例的仿真检验证实,NEM计算精度高,适用于以长时间步距来计算耦合修正因子;CMFD计算速度快,适用于以短时间步距实时计算功率分布。NIM融合2种方法的优点,应用于反应堆堆芯实时计算,既可以达到相应精度,又可以达到实时性好的特点,最终结果满足核电厂仿真机反应堆模型对实时性与高精度的要求。
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关键词:
- 非线性迭代法(NIM) /
- 耦合修正因子 /
- 堆芯物理 /
- 实时仿真
Abstract: It is difficult to satisfy both high precision and speed of the 3 D distribution calculation of reactor power, during the development of full scope simulator for nuclear power plants. A 3 D real-time simulation code is developed for reactor core based on the Nonlinear Iteration Method(NIM). The coupled correction factor is calculated with long step time using Nodal Expansion Method(NEM) by its high accuracy. The flux and power are calculated in real-time using Coarse Mesh Finite Difference Method(CMFD) by its rapid speed. In contrast with the calculation of typical benchmark examples, the NIM simulation results showed that the calculation of reactor core using corrected coupling factor revised CMFD can not only keep the precision, but also can improve the calculation speed. NIM is a good 3 D real-time iteration strategy satisfied with the full scope simulator in nuclear power plants.-
Key words:
- NIM /
- Corrected coupling factor /
- Reactor core /
- Real time
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