重水反应堆启动“盲区”特性模拟研究  

Simulation Study on Characteristics of “Blind zone” in Startup of Heavy Water Reactor

作　　者：花晓[1] 王玉林[1] 朱学微[1] 丁丽[1] HUA Xiao;WANG Yu-lin;ZHU Xue-wei;DING Li(China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]中国原子能科学研究院,北京102413

出　　处：《核电子学与探测技术》2018年第4期596-598,共3页Nuclear Electronics & Detection Technology

摘　　要：采用MCNP程序和ORIGEN-ARP程序对以重水为慢化剂的研究堆低功率水平下光激中子特性进行计算,以此反应堆核测量系统为例研究了由于光激中子强度低导致反应堆启动"盲区"的机理。分析结果表明,停堆后50 d内光激中子大约为1×109n/s数量级,在停堆超过150 d以后核测系统将无法探测到临界状态以及次临界状态下堆内中子水平的变化,导致"盲区"的产生,在停堆超过200 d后光激中子强度约为1×107n/s数量级。In this paper,the photoneutron characteristics of a research reactor (with heavy water as the moderator)at low power level are calculated by the MCNP program and the ORIGEN-ARP program.The nuclear measuring system of this reactor is taken as an example to study the formation mechanism of "blind zone"in reactor startup due to low intensity of photoneutron.The analysis results show that the photo neutron intensity is approximate to 1× 10^9 n/s within 50 days after shutdown.150 days later after the shutdown,the nuclear measuring system will not be able to detect the in-core neutron level variation under the critical and subcritical states,causing the formation of "blind zone".200days later after the shutdown,the photoneutron intensity is approximate to l×l0^7 n/s.

关 键 词：低功率 光激中子 反应堆启动“盲区” 

分 类 号：TL18[核科学技术—核能科学]