核电站冷却海水放射性监测仪表设计改进

Design Improvement of Radioactive Monitoring Instrument for Cooling Seawater in Nuclear Power Plant

本文介绍核电站回排海水放射性监测仪表的基本探测原理和架构;针对水下探测组件导向管腐蚀和变形问题,对仪表导向管进行了设计改进;使用蒙卡计算、标准放射源实验方法,分别验证了改进后的仪表导向管对探测效率的影响,两种方法计算出的仪表探测效率在0.8~1.5 MeV能区基本吻合;改进的导向管设计及效率验证方法,可供辐射仪表研制和运维参考.

This paper introduces the basic detection principle and structure of the seawater radioactivity monitoring instrum ent for nuclear power plant back-drain.Aiming at the corrosion and deformation of the guide tube of underwater detection m odule,the design of the guide tube is improved.The influence of the improved guide tube on the detection efficiency is verified by using Monte Carlo calculation and standard radiation source experiment methods,and the detection efficiency of the instrum ent calculated by the two methods is also verified and basically coincides from 0.8〜1.5MeV energy range of radiations.The improved design and efficiency verification method of guide tube can be used for reference in the development and maintenance of radiation instruments.