HFETR燃料元件破损监测样机的无源效率刻度  

Sourceless efficiency calibration of fuel element failure monitoring prototype of HFETR

作　　者：王力 左伟[1,2] 吴耀 刘晓松 许非[1,2] 杨潇潇 WANG Li;ZUO Wei;WU Yao;LIU Xiaosong;XU Fei;YANG Xiaoxiao(Institute of Reactor Operation and Application,Nuclear Power Institute of China,Chengdu,610005,China;Sichuan Engineering Laboratory for Nuclear Facilities Decommissioning and Radwaste Management Chengdu,610005,China)

机构地区：[1]中国核动力研究设计院第一研究所,四川成都610005 [2]四川省核设施退役与放射性废物治理工程实验室,四川成都610005

出　　处：《核电子学与探测技术》2025年第1期25-30,共6页Nuclear Electronics & Detection Technology

基　　金：中国核动力研究设计院核技术预研基金,JJXM-HJYY-2020。

摘　　要：基于γ能谱测量法研制的HFETR(高通量工程试验堆,High Flux Engineering Test Reactor)燃料元件破损监测样机,其探测效率的主要影响因素是准直孔直径和探测距离;样机监测对象为HFETR一回路引出管道中的冷却剂,采用蒙特卡罗模拟法对样机进行无源效率刻度;建立了样机的探测模型,利用标准源修正了模型的准确性。计算了^(24)Na在不同准直孔直径、不同探测距离下的探测效率值,拟合了探测效率曲线公式,完成了^(24)Na活度监测的无源效率刻度;计算了准直孔直径为5cm、探测距离为65cm情况下^(24)Na的探测效率值,对HFETR一回路冷却剂进行连续监测并获取了^(24)Na的活度浓度;与取样监测相比,^(24)Na活度浓度的相对偏差在5%以内,证明了该无源效率刻度方法的准确性与实用性。The main factors affecting the detection efficiency of the HFETR fuel element failure monitoring prototype developed based onγ-energy spectrum measurement are collimation hole diameter and detection distance.The monitoring object of the prototype is the coolant in the primary extraction pipe of HFETR,so it is impossible to prepare a standard source for active efficiency calibration of the prototype,and Monte Carlo simulation method is adopted for passive efficiency calibration of the prototype.The probe model of HPGe detector is established,and the accuracy of the model is corrected by using standard source.The detection efficiency values of^(24)Na under different collimation hole diameters and detection distances were calculated,and the detection efficiency curve formula was fitted to complete the passive efficiency scale of^(24)Na activity monitoring.The detection efficiency of^(24)Na with collination hole diameter of 5cm and detection distance of 65cm was calculated,and the activity concentration of^(24)Na was obtained by continuous monitoring of HFETR primary coolant.Compared with sampling monitoring,the relative deviation of^(24)Na activity concentration was less than 5%,which proved the accuracy and practicability of the passive efficiency calibration method.

关 键 词：监测样机 无源效率刻度 直径 距离 活度 

分 类 号：TL814[核科学技术—核技术及应用]