钒自给能探测器响应电流“γ峰”现象的模拟与分析  

Simulation and Analysis of Response Current“γ Peak”Phenomenon in Vanadium Self-Powered Neutron Detector

作　　者：邵睿智 曹良志[1] 李云召[1] 李雪松 司峰伟 郝腾飞 桑耀东 邓邦杰 张清民 吉文浩 SHAO Rui-zhi;CAO Liang-zhi;LI Yun-zhao;LI Xue-song;SI Feng-wei;HAO Teng-fei;SANG Yao-dong;DENG Bang-jie;ZHANG Qing-min;JI Wen-hao(School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an 710049,China;Sanmen Nuclear Power Company,Taizhou 317100,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Insitute of China,Chengdu 610213,China)

机构地区：[1]西安交通大学核科学与技术学院,西安710049 [2]三门核电有限公司,台州317100 [3]中国核动力研究设计院核反应堆系统设计技术重点实验室,成都610213

出　　处：《现代应用物理》2021年第1期51-55,共5页Modern Applied Physics

基　　金：国家自然科学基金资助项目(12005164)。

摘　　要：利用西安交通大学自主研发的压水堆堆芯分析程序NECP-Bamboo和自给能探测器响应电流模拟程序SPND-Signal,构建了自给能探测器响应电流模拟分析平台,对AP1000堆芯中钒自给能探测器的响应电流“γ峰”现象进行了模拟计算与分析,给出了不同燃料组件内响应电流在快速甩负荷过程中的变化曲线,分析了响应电流的构成组分,探讨了AP1000堆芯中钒自给能探测器响应电流“γ峰”现象的产生机理。结果表明,在AP1000堆芯中的钒自给能探测器内,中子对电流的贡献为正向、光子对电流的贡献为负向,在甩负荷瞬间,正向电流降低的值小于负向电流降低的值,导致总电流短暂升高,从而形成“γ峰”现象。In this paper,the response current“γpeak”phenomenon of vanadium self-powered neutron detector(SPND)in AP1000 core is simulated and analyzed based on NECP-Bamboo program and SPND-Signal program which are developed by Xi’an Jiaotong University.The response current-time curves in different assemblies during the rapid load-off process are given,and the components of the response current in SPND are analyzed.The generation mechanism of response current“γpeak”phenomenon in vanadium self-powered neutron detector is discussed.The results show that in AP1000 core self-powered neutron detector,the response current induced by neutron is positive,the response current induced by photon is negative.In the moment of power dump,the value of positive current decrease is less than that of negative current,resulting in a transient increase of total current,thus forming“γpeak”phenomenon.

关 键 词：AP1000 自给能探测器 “γ峰” NECP-Bamboo程序 SPND-Signal程序 

分 类 号：TL329[核科学技术—核技术及应用]