The Application of Modelica Simulation Technology in Micro Gas-Cooled Reactor
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摘要: 相比传统大型核电厂，微型反应堆各系统功能间紧密耦合且相互制约，传统的分专业解耦设计模式难以应对，需开展全范围的系统仿真。采用Modelica语言建立了气冷式微型反应堆的系统仿真模型，以未能紧急停堆的预期瞬态（ATWS）事故为例开展事故分析计算，并与专业堆芯安全分析结果对比，结果表明反应堆功率变化趋势较为一致，且ATWS事故后仅依靠堆芯温度升高引入的负反应性可实现停堆。本文研究方法为气冷式微型反应堆的全系统建模仿真打下了坚实基础，也为其他类型反应堆的系统建模仿真提供了很好的借鉴作用。
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关键词:
- Modelica语言 /
- 系统建模 /
- 系统仿真 /
- 微型反应堆
Abstract: Compared with traditional large-scale nuclear power plants, the functions of micro reactor systems are closely coupled and restrict each other. The traditional professional decoupling design mode is difficult to deal with it, and a full range of system simulation is needed. A system simulation model of an gas-cooled micro reactor is established by using Modelica language, and the accident analysis and calculation is carried out by taking the expected transient (ATWS) accident without emergency shutdown as an example, and compared with the results of professional core safety analysis. The results show that the change trend of reactor power is consistent, and the shutdown can be realized only by the negative reactivity caused by the increase of core temperature after ATWS accident. The research method proposed in this paper not only lays a solid foundation for the whole system modeling and simulation of gas-cooled micro reactor, but also provides a good reference for the system modeling and simulation of other types of reactors.-
Key words:
- Modelica language /
- System modeling /
- System simulation /
- Micro-reactor
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图 6 燃料区热工模型
Qfission,i,j—内热源形式的输入热能，W；Qcoolant,i,j—内部通道冷却剂对流传热的输出能量，W；Qradial,i−1,j—径向内侧区域的输入导热能量（i=1的各节块不含此项），W；Qradial,i+1,j—向径向外侧区域的输出导热能量（i=4时，此项即为堆芯最外层与非燃料区反射层的导热能量），W；Qaxial,i,j−1—轴向上侧节块的导热能量（j=1的各节块不含此项，输入输出由计算得出），W；Qaxial,i,j+1—轴向下侧节块的导热能量（j=6的各节块不含此项，输入输出由计算得出），W
Figure 6. Thermal Model of Fuel Region
图 7 一维导热模型
Qflow,cond—导热能量，W；port,a—内侧节块；port,b—外侧节块
Figure 7. One-Dimensional Heat Conduction Model
图 8 二维导热模型
nx—径向节块数；Qst,inner—径向内侧其他部件向热构件最内侧节块的输入能量（仅i=1的各节块含此项），W；Qst,outer—热构件最外侧节块向径向外侧其他部件的输出能量（仅i=nx的各节块含此项），W；Qst,radial,i−1,j—热构件内部径向内侧节块的输入导热能量（i=1的各节块不含此项），W；Qst,radial,i+1,j—热构件内部径向外侧节块的输出导热能量（i=nx的各节块不含此项），W；Qst,axial,i,j−1—热构件内部轴向上侧节块的导热能量（j=1的各节块不含此项，输入输出由计算得出），W；Qst,axial,i,j+1—热构件内部轴向下侧节块的导热能量（j=6的各节块不含此项，输入输出由计算得出），W
Figure 8. Two-Dimensional Heat Conduction Model
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