核电站核岛和常规岛废液放射性活度监测通道系统优化研究

Research on the Optimization of Channels for Monitoring Activity of Liquids in Nuclear Island and Conventional Island Liquid Waste Discharge System of Nuclear Power Plant

大亚湾及岭澳核电站辐射监测系统整体改造项目中,核岛、常规岛废液放射性活度监测通道将采用在线测量方式来代替原来的取样离线连续测量方式。采用MCNP5蒙特卡罗计算软件,通过建立计算模型后,并输入相关参数,模拟计算出在线测量方式下探测器的测量范围和探测下限均好于原有测量方式。结果表明:核岛、常规岛废液放射性活度监测通道拟采用在线测量方式是可行的,其性能完全可以满足原设计的要求,可实现监测通道的系统优化。

In Daya Bay and LingAo Plant Radiation Monitoring system retrofit project , channels for monitoring activity of liquids in Nuclear Island and Conventional Island Liquid Waste Discharge system will use on line liq -uid monitor to replace the existing off -line sampling monitor .A mathematical model was created by using of the Monte Carlo simulation software -MCNP5.After inputting several parameters about the on line liquid mo-nitor measurement loop , the measurement range and the minimum detectable activity （ MDA） of the on line liq-uid monitor calculated by MCNP 5 are better than the existing off -line sampling monitor .The results indicates that it is feasible to use on line liquid monitor to monitor activity of liquids in Nuclear Island and Conventional Island Liquid Waste Discharge system , and the performance can completely meet the requirement of the original design of these channels , so as to realize the optimization of the radiation monitoring system .