摘要
当前基于燃耗信任制的乏燃料密集贮存方式,对乏燃料水池格架中子吸收材料的可靠性和有效性,都提出了更高的要求。在格架材料生产和使用过程中需要对其中子吸收性能(硼含量)进行无损检测和监测,针对这两个方面的需求,我们研制了核电厂乏燃料水池格架B_(4)C_Al中子吸收材料检测设备。该检测设备主要由中子源(3枚252Cf放射源)、中子探测器(^(10)个锂玻璃组成的探测阵列)、中子屏蔽准直和慢化系统等组成,通过测量中子透射率来推算待测样板上各个测量点的^(10)B面密度,从而达到对于乏燃料水池贮存格架材料B_(4)C_Al合金硼含量的无损检测。使用该套设备进行了两种B_(4)C_Al合金20 cm×30 cm悬挂样片的检测,结果可靠。该B_(4)C_Al材料中子吸收性能检测设备为国内首创,推动了我国含硼中子吸收材料的无损检测研究,能为核电厂乏燃料水池的临界安全监测提供有力保障。
The current intensive storage method of spent fuel based on fuel consumption trust system has put forward higher requirements for the reliability and effectiveness of neutron absorbing materials in the spent fuel pool grid.Non-destructive testing and monitoring of neutron absorption performance(boron content)is required during the production and use of grid materials.In response to these two requirements,a nuclear power plant spent fuel pool grid B_(4)C_Al neutron absorption material testing equipment has been successfully developed.The detection equipment is mainly composed of the neutron source(3252Cf radiation sources),the neutron detection array(a detection array composed of^(10)lithium glass detectors),the neutron shielding collimation and slowing system,etc.,and then the^(10)B surface density of each measuring point on the sample plate would be calculated by measuring the neutron transmittance,and the method of non-destructive testing of the B_(4)C_Al alloy boron content of the spent fuel pool storage grid material would be accomplished.The equipment has been successfully used to complete the 20 cm×30 cm hanging sample test,and the results were reliable.The detection equipment is the first one designed for B_(4)C_Al material neutron absorption performance testing,which promotes the non-destructive testing of boron-containing neutron absorption materials of China,and provides a strong guarantee for the criticality safety monitoring of the spent fuel pool of nuclear power plants.
作者
苏晓斌
侯龙
刘世龙
杨毅
王琦
SU Xiaobin;HOU Long;LIU Shilong;YANG Yi;WANG Qi(Science and Technology on Nuclear Data Laboratory,China Institute of Atomic Energy,Beijing 102413,China)
出处
《原子核物理评论》
CAS
CSCD
北大核心
2021年第3期283-292,共10页
Nuclear Physics Review
