核临界安全中子吸收体干涉效应实验研究

Interfering Reaction Experiment Study of Neutron Absorber Object for Nuclear Critical Safety

简要阐述了干涉效应的原理、铀溶液实验装置的临界测量实验,研究了多组固体中子吸收体在装置容器中的不同位置、不同铀溶液浓度、不同组合情况下的吸收效率,并给出干涉效应。测量结果表明,偏心对称布置的干涉效应为正,偏心非对称布置的干涉效应为负。同时,利用蒙特卡罗程序分别对固体中子吸收体不同布置和组合情况下的中子吸收效率进行了计算分析。计算结果表明,实验测量与理论计算的干涉效应大小、正负的变化趋势相互一致,这表明,利用蒙特卡罗程序计算分析铀溶液系统的中子吸收体的干涉效应是适宜的。

The theory of interfering effects of neutron absorber and the criticality measurement experiments at the uranyl nitrate solution experiment facility was described.In the criticality experiments,the absorbing efficiencies and its interfering effects for multi-group solid neutron absorbers under different locations and arrangements with different concentrations of the uranyl nitrate solutions were measured.The measured results indicate that for eccentric symmetrical arrangement the interfering effect is positive,and for eccentric non-symmetrical arrangement the interfering effect is negative.Meanwhile,Monte-Carlo calculation code was used for calculations in these different cases.The calculated results show the consistence with the experimental data on the values and its variance trend of interfering effects.It confirms that the Monte-Carlo calculation code is suitable for analyses of interfering effects on the uranyl nitrate solution facility.