摘要
分别采用点堆模型及蒙特卡罗方法,模拟计算了炸药样品在CFBR-II堆外辐照时,样品组合板内中子注量率不均匀度随防爆罐安放距离的变化关系。统筹考虑实验效率与质量控制之间的矛盾,最终确定防爆罐距堆芯的最佳安放距离为40.5 cm,对应的样品组合板内中子注量率不均匀度好于11%。模拟结果显示,防爆罐的引入使得样品处中子注量率增加而能谱软化,等效中子注量率比裸场数据低约1.6%。分析了事故情形下堆体产生的总裂变数,论证了其核安全性,为指导实验顺利开展提供了理论指导。
Unevenness of irradiation explosive＇ s neutron flux rate was calculated using point reactor model and Monte Carlo meuhod. Considering experimental efficiency and quality control, the best distance was confirmed to be 40.5 cm, so that the corresponding neutron flux rate unevenness could be better than 11%. Simulation results showed that, the introduction of the explosion-proof can increased neutron fluence rate in samples with the energy spectrum softening, equivalent neutron flux rate was about 1.6% lower than bare field data. The total fission num- ber under extreme accident circumstances were analyzed and its security was demonstrated. These studies could be a theoretical guidance to experiment smoothly.
出处
《科学技术与工程》
北大核心
2015年第13期140-143,共4页
Science Technology and Engineering
关键词
炸药
辐照实验
安全分析
蒙特卡罗
explosive irradiation experiment safety analysis Monte Carlo method
