铀浓缩厂铀丰度在线监测装置研制  

Development of On-line Uranium Enrichment Monitor of Gaseous UF_6 for Uranium Enrichment Plant

作　　者：吕学升[1] 刘国荣[1] 金惠民[1] 赵永刚[1] 郝学元 李井怀[1] 应斌 俞兆飞 

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413 [2]中核兰州铀浓缩有限公司,甘肃兰州730030

出　　处：《原子能科学技术》2013年第6期1060-1063,共4页Atomic Energy Science and Technology

摘　　要：研制了铀浓缩厂产品端UF6气体235 U丰度在线实时监测装置。该装置由NaI(Tl)探测器、脉冲处理器、压力和温度传感器、管道阀门系统等组成,利用NaI(Tl)探测器对测量容器内气态UF6中235 U发射的特征γ射线进行测量来得到235 U的量,利用传感器对气体温度、压力进行测量,根据理想气体状态方程得到UF6气体中U的总量,从而得到235 U丰度。该装置现场应用实验表明:铀丰度在线监测结果相对标准偏差小于1%,与气体质谱计测量结果相对偏差小于1%。An on-line enrichment monitor was developed to measure the enrichment of UF6 flowing through the processing pipes in uranium enrichment plant.A NaI（Tl） detector was used to measure the count rates of the 185.7 keV γ-ray emitted from 235U,and the total quantity of uranium was determined from thermodynamic characteristics of gaseous uranium hexafluoride.The results show that the maximum relative standard deviation is less than 1% when the measurement time is 120 s or more and the pressure is more than 2 kPa in the measurement chamber.Uranium enrichment of gaseous uranium hexafluoride in the output end of cascade can be monitored continuously by using the device.It should be effective for nuclear materials accountability verifications and materials balance verification at uranium enrichment plant.

关 键 词：铀浓缩厂 铀丰度 在线监测 

分 类 号：TL275[核科学技术—核燃料循环与材料]