堆外核测量系统裂变电离室线性响应研究  

Study on the Linear Response of Fission Ionization Chamber for Ex-core Nuclear Instrumentation System

作　　者：邱顺利 董进诚 葛孟团 肖伟 孙光智[1] 周宇琳 曾乐 刘海峰 翟春荣 汤仲鸣 石先武 刘文臻 QIU Shunli;DONG Jincheng;GE Mengtuan;XIAO Wei;SUN Guangzhi;ZHOU Yuling;ZENG Le;LIU Haifeng;ZHAI Chunrong;TANG Zhongming;SHI Xianwu;LIU Wenzhen(Wuhan Secondary Institute of Ships,Wuhan 430064,China;State Nuclear Power Automation System Engineering Company,Shanghai 200233,China)

机构地区：[1]武汉第二船舶设计研究所,武汉430205 [2]国核自仪系统工程有限公司,上海200233

出　　处：《核电子学与探测技术》2024年第3期454-463,共10页Nuclear Electronics & Detection Technology

基　　金：国家科技重大专项(2019ZX06002012)。

摘　　要：为满足先进反应堆堆外核测量系统中间量程测量通道灵敏度高、探测器灵敏区长、反应堆线性响应好的需求,采用多支灵敏区长度具有一定比例关系、同时机械结构完全相同的裂变电离室,进行热中子灵敏度标定和反应堆线性响应研究,以为核电厂实际所需长灵敏区裂变电离室提供一种在现有试验堆条件下进行其核性能试验的方法。通过测量不同灵敏区长度的裂变电离室热中子灵敏度和反应堆高中字注量率下的线性响应,对其热中子灵敏度随灵敏区长度的线性变化和反应堆线性响应进行试验验证。测量结果表明,裂变电离室热中子灵敏度随灵敏区长度呈线性关系,且在反应堆热中子注量率1.23×10^(2)~3.10×10^(10)nv(1nv=1n·cm^(-2)·s^(-1))范围内进行计数率模式和MSV模式线性拟合,裂变电离室最大线性度为-1.23%。In order to meet the requirements of high sensitivity,long sensitive region of detector,and good reactor linear response of the intermediate range channel of advanced reactor ex-core nuclear instrumentation system,thermal neutron sensitivity calibration and reactor linear response test were carried out,in this work,by using a plurality of fission ionization chambers having a proportional length of the sensitive region and the same mechanical structure.This paper provides a method of nuclear performance test for long sensitive region fission ionization chamber in nuclear power plant under the existing test reactor conditions.By measuring the thermal neutron sensitivity of fission chamber with different length of sensitive region and the linear response of the reactor under high neutron flux,the linear variation of the thermal neutron sensitivity with the length of the sensitive region and the linear response of the reactor are tested and verified.The results show that the thermal neutron sensitivity of fission ionization chamber is linear with the length of sensitive region,and the linear fitting on counting rate mode and MSV mode has been done in the range of 1.23×10^(2)~3.10×10^(10)nv(1nv=1n·cm^(-2)·s^(-1)),the maximum linearity of the fission chamber is-1.23%.

关 键 词：堆外核测量系统 裂变电离室 反应堆线性响应 热中子灵敏度 线性度 

分 类 号：TL816[核科学技术—核技术及应用]