弱耦合堆芯功率调节系统的稳定性

Stability of Weak-Coupled Core Power Adjustment System

对两个弱耦合堆芯的功率调节系统的稳定性作了分析研究。由一个简单物理模型得到了弱耦合堆芯之间的耦合反馈系数和反馈传递函数,建立了弱耦合堆芯的功率调节方块图。对系统作了稳定性分析,得出了堆功率的稳定范围;分析了系统参数变化对稳定功率阈值的影响。结果表明:在一定的耦合条件下,超过某个功率阈值将导致系统不稳定;随着两个堆芯区域之间的耦合减弱,这一功率阈值变低,反应堆只能在较低功率水平下稳定运行。

The stability of the weak coupled core power adjustment system was investigated.Coupling feedback coefficient and feedback transfer function of the weak coupled core were set up.System stability analysis was performed by the power adjustment block diagram of the weak coupled core,and the core power stable thresholds were obtained.Influence of the system parameter change on stable power threshold was analysed.Results show,under a given coupling condition,the system will be unstable when the power overtakes its threshold.The power threshold is decreasing when the coupling of two core areas is weakening,and the reactor could operate stably only on a lower power level.