基于动态氙条件的单点校刻技术研究及应用  

Research and Application of Single-Point Calibration Technology Based on Dynamic-xenon Condition

作　　者：白家赫 郑东佳 万承辉 李载鹏[2] 房何 潘泽飞 吴宏春[1] Bai Jiahe;Zheng Dongjia;Wan Chenghui;Li Zaipeng;Fang He;Pan Zefei;Wu Hongchun(School of Nuclear Science and Technology,Xi’an Jiaotong University,Xi’an,710049,China;Jiangsu Nuclear Power Co.,Ltd.,Lianyungang,Jiangsu,222042,China)

机构地区：[1]西安交通大学核科学与技术学院,西安710049 [2]江苏核电有限公司,江苏连云港222042

出　　处：《核动力工程》2024年第3期45-50,共6页Nuclear Power Engineering

基　　金：国家自然科学基金(12005164);中国国家留学基金(202206280230)。

摘　　要：核电厂在换料大修后的升功率期间会在指定功率水平实施堆外功率量程探测器(简称堆外探测器)校刻试验,以指示准确的堆芯功率水平和轴向功率偏差。本文提出了在动态氙条件下进行堆外探测器校刻的方法,基于动态氙条件单次堆芯通量测量试验,结合堆芯物理分析程序SPARK提供的动态氙理论库,进行堆芯功率重构,然后采用单点校刻方式完成堆外探测器校刻;整个过程无需长时间等待堆芯达到氙平衡状态,具有较高的经济效益。采用田湾核电站5号机组第2次大修升功率期间的实测数据对该方法进行验证,功率水平误差全部在±1.0%以内,轴向功率偏差的误差全部在±0.5%以内。验证结果表明,本文提出的动态氙条件下单点校刻方法能够在达到指定功率水平2 h后即完成堆外探测器校刻任务,且校刻系数具有较高的计算精度。During the power-elevation after refueling overhaul,the nuclear power plant will carry out calibration test of ex-core power range detector(referred to as ex-core detector)at the specified power level to indicate the accurate core power level and axial power deviation.This paper proposes an ex-core detector calibration method based on dynamic-xenon condition.Based on the single core flux measurement test under dynamic xenon condition,and combined with the dynamic xenon theoretical library provided by the core physical analysis code SPARK,the core power is reconstructed,and then the calibration of the ex-core detector is completed by single-point calibration.The long waiting time for xenon equilibrium isn’t required in the whole process,which has high economic benefits.The method is verified by the measured data of Unit 5 in Tianwan Nuclear Power Station during power elevation in the second overhaul,and the errors of power level and axial power deviation are all within±1.0%and±0.5%,respectively.The verification results show that the single-point calibration method proposed in this paper can complete the calibration of ex-core detector within 2 h after the specified power level is reached,and the calibration coefficient has high calculation accuracy.

关 键 词：堆外功率量程探测器 单点校刻法 动态氙通量测量 动态氙理论库 SPARK程序 

分 类 号：TL329[核科学技术—核技术及应用]