基于钚铍中子源的硼表辐射屏蔽分析  

Radiation Shielding Analysis of Boron Meter Based on Pu-Be Neutron Source

作　　者：代启东[1,2] 踪训成 舒文[1] 陶昱姗 王红波 牛江[1] DAI Qidong;ZONG Xuncheng;SHU Wen;TAO Yushan;WANG Hongbo;NIU Jiang(Reactor Engineering Research Division,Nuclear Power Institute of China,Chengdu 610213,China;Institute of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China)

机构地区：[1]中国核动力研究设计院反应堆工程研究所,成都610213 [2]四川大学原子核科学技术研究所,成都610064

出　　处：《核电子学与探测技术》2024年第5期832-838,共7页Nuclear Electronics & Detection Technology

摘　　要：压水堆核电站一回路水中硼浓度的连续监测装置称为硼表,在硼表正常工作过程中,需要使用活度满足硼浓度在线监测要求的中子源。为了确保操作人员在调试、使用硼表过程中,人员受照剂量不超限值,并掌握硼表周围的中子、伽马剂量分布情况,使用MCNP软件对基于钚铍中子源的硼表进行了辐射屏蔽计算,测量了硼表探测装置外部六个方位的辐射剂量分布,并将计算结果与测量结果进行了对比。研究结果表明,探测装置外部的中子、伽马剂量率计算值与测量值符合较好,硼表探测装置周围剂量率分布测量结果表明剂量率随距离下降趋势明显,只要控制操作时间及操作距离,可确保人员辐射安全。The continuous monitoring device of boron concentration in primary system of PWR nuclear power plant is called boron meter,and during normal operation of the boron meter,it is necessary to use a neutron source whose activity meets the requirements of on-line boron concentration monitoring.In order to ensure that while the operator is debugging or using boron meter,the exposure dose is below the limit and in order to get the distribution of neutron and gamma outside the boron meter,MCNP was used to calculate the radiation shielding of boron meter based on Pu-Be neutron source,and the radiation dose distribution in six directions outside the boron meter detector was measured,and the calculated results were compared with the measured results.The results show that the calculated neutron and gamma dose rates outside the boron meter detector are in good agreement with the measured values,the distribution measuring result of dose rate outside the boron meter detector shows that the dose rate decreases significantly by distance.As long as the operation time and operating distance are controlled,the radiation safety of personnel can be ensured.

关 键 词：钚铍中子源 硼表 屏蔽计算 核电站 

分 类 号：X826[环境科学与工程—环境工程]