启明星Ⅱ号中子吸收体反应性价值测量

Measurement of Reactivity Value of Neutron Absorber in Venus-Ⅱ

为验证加速器驱动的次临界系统(ADS)次临界反应堆设计时理论计算所使用的计算程序和核数据,在ADS启明星Ⅱ号零功率装置的铅冷堆芯中采用不锈钢元件作为中子吸收体,利用周期法对不锈钢中子吸收体的反应性价值进行实验研究。实验结果表明:吸收体的反应性价值随元件与中心径间距离的增加而降低,实验测量与理论计算的反应性价值接近,变化趋势相互吻合。经实验验证的理论计算程序和核数据可用于ADS次临界反应堆的设计。

In order to verify the calculation code and nuclear data used in the theoretical calculation of the accelerator driven sub-critical system(ADS) sub-critical reactor design, a stainless steel component was used as a neutron absorber in the lead-cooled core of the ADS Venus-Ⅱ zero-power facility, and reactivity value of stainless steel neutron absorber was measured with the periodic method. The experimental results show that the reactivity value of stainless steel neutron absorber decreases with the increase of the distance between the rod and the center. The experimental value is close to the theoretical value, and they have similar variation trend. Experimentally validated theoretical calculation code and nuclear data can be used in ADS sub-critical reactor design.