“华龙一号”铑自给能中子探测器信号电流成分分析  

Analysis of Signal Current Composition of the Rhodium Self-powered Neutron Detector in HPR1000

作　　者：吴雄 蔡利 张香菊 吴亭雨 罗世杰 蒋洁琼[1] WU Xiong;CAI Li;ZHANG Xiangju;WU Tingyu;LUO Shijie;JIANG Jieqiong(Institute of Nuclear Energy Safety Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei of Anhui Prov.230031,China;University of Science and Technology of China,Hefei of Anhui Prov.230026,China;China Nuclear Power Technology Research Institute Co.,Ltd.,Shenzhen of Guangdong Prov.518000,China)

机构地区：[1]中国科学院合肥物质科学研究院核能安全技术研究所,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026 [3]中广核研究院有限公司,广东深圳518000

出　　处：《核科学与工程》2024年第5期1030-1037,共8页Nuclear Science and Engineering

摘　　要：“华龙一号”是我国自主研发的第三代大型先进压水反应堆核电厂,其反应堆内数以百计的铑自给能中子探测器被用于堆芯在线监测。铑自给能中子探测器在反应堆内不仅受到中子照射,堆内的高强度γ射线也会产生噪声电流。同时,铑自给能中子探测器作为一种代表性的延迟响应探测器,其自身还存在一定份额的瞬发电流信号。这些特征使其电流组成成分相当复杂,精确确定有效电流信号并且剔除噪声信号对探测器的性能和测量精度至关重要。本文对铑自给能中子探测器的电流组成成分进行了详细分析,并基于蒙特卡罗方法提出了定量计算各部分电流的模型。计算结果表明,铑自给能中子探测器在“华龙一号”中的瞬发电流占总电流的比值约为8%,其中由光子引起的电流约为3%,该结果和实验值符合良好。该方法主要的优点在于可以模拟堆内不同中子、光子环境而不必依赖于大量的实验。同时该方法具有通用性,可对不同堆型的自给能中子探测器进行电流分析并提供有益的参考和借鉴。The HPR1000 is a self-developed advanced Gen.ⅢPWR nuclear power plant,of which hundreds of rhodium self-powered neutron detectors(SPND)are equipped for reactor core monitoring.The rhodium detectors are not only irradiated by the in-core neutrons but also generate noise currents due to the high intensity of theγrays.Meanwhile,as a representative delayed-response detector,the rhodium SPND also have a proportion of the prompt current.These characteristics lead to a significant complexity in its response composition,exactly determining the effective signal and thereby removing the noise is critical to the detector's performance and measurement accuracy.In this paper,the current composition components of rhodium detectors are analyzed thoroughly,and the model based on the Monte Carlo methods for quantitative calculations of each part of the current has been proposed.The calculation results show that the prompt current of the rhodium SPND in the HPR1000 accounts for about 8%of the total current,and the current induced by photons is approximately 3%.These results are in good agreement with the experimental values.The main advantage of this method is that it can simulate different neutron and photon environments in the reactor without relying on a large number of experiments.At the same time,this method is universal and could provide a valuable reference for the signal analysis of SPND in different reactors.

关 键 词：反应堆监测 铑自给能中子探测器 信号电流组成 “华龙一号” 蒙特卡罗方法 

分 类 号：TL48[核科学技术—核技术及应用]