【摘要】 依据中子增殖规律,应用点堆模型动态方程分析了CFBR-Ⅱ脉冲堆停堆的物理过程,发现坪区功率与预加反应性无关,原因是缓发中子产生强度与中子增殖两个相反因素互相抵消。利用两套10 B电离室分别测量获得了坪区功率和爆发脉冲后350s内堆功率的变化。该堆停堆过程中功率变化为:坪区时3.5MW,主安全块下降5mm时209kW,各部件外下限时4.8kW,30s时约60W。更多还原

【Abstract】 The shutdown physics process of CFBR-Ⅱ was analyzed based on dynamic function in point reactor model and principle of neutron multiplication.It is found that the plateau power is not determined by preloaded reactivity because the intensity of delayed neutron counteracts neutron multiplication.The plateau power and the power within 350 s after burst were measured by two 10B ionization chamber systems.The respective powers in shutdown process are 3.5 MW on plateau for delayed neutron,209 kW when major safety block drops to 5 mm,4.8 kW when the all rods and major safety block get out and 60 W at 30 s after burst.更多还原