中文摘要：

阐述了压水堆堆芯的数学模型,基于SIMULINK计算仿真工具,建立了相应的仿真模型,并进行了仿真计算.结果表明：不考虑中毒效应,引入反应性阶跃扰动和冷线温度扰动,由于温度效应的负反馈作用,中子密度、燃料温度和冷却剂温度能够到达一个新的平衡,核反应堆具有内在的自稳定性.考虑中毒效应后,反应堆受到的扰动减少,有利于反应堆的自稳定性.

英文摘要：

The mathematical model of the PWR core is expounded. Based on SIMULINK tool,the corresponding simulation model is established,and the mode is simulated. The analysis results show that： regardless of the poisoning effects,importing reactivity step disturbance and cold line temperature disturbance,due to the effect of negative feedback of the temperature effect,neutron density,fuel temperature and coolant temperature can reach a new equilibrium. The nuclear reactor has intrinsic stability. Considering the poisoning effects,reactor is fewer disturbed,which is beneficial to the stability of the reactor.