压水堆堆外核仪表系统单点校刻法研究及应用  

Research and Application of Single-Point Calibration Method for Ex-core Nuclear Instrument System of PWRs

作　　者：白家赫 杨灏哲 万承辉 潘泽飞 李载鹏[2] 李云召[1] 吴宏春[1] Bai Jiahe;Yang Haozhe;Wan Chenghui;Pan Zefei;Li Zaipeng;Li Yunzhao;Wu Hongchun(Department 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系,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》2023年第4期25-32,共8页Nuclear Power Engineering

基　　金：国家自然科学基金(12005164)。

摘　　要：压水堆堆外探测器用于实时指示堆芯的功率水平以及轴向功率偏差,需要定期校刻保证指示精度,一般采用多点校刻的方式,多次移动控制棒及通量图测量,极大地影响了核电厂的经济性和安全性。因此,本研究提出了堆外核仪表系统的单点校刻法,将理论计算与实测数据结合,引入轴向功率偏移修正量和堆外探测器灵敏度系数,并利用堆芯分析软件模拟控制棒移动,最后确定堆外探测器的校刻系数。基于该单点校刻法,在压水堆堆芯分析程序SPARK中完成了功能开发,并采用M310机组多循环的实测数据完成了单点校刻法在工程应用中的验证。验证结果表明,本文提出的单点校刻法具有较高的校刻精度,与实测值对比,功率水平和轴向功率偏差的误差平均值分别为0.31%和0.16%。因此,该单点校刻法能够准确确定堆外探测器校刻系数,且能节省校刻时间,无需控制棒移动,有助于提升核电厂经济性和安全性,具有工程应用及推广价值。The ex-core detector is used to indicate the reactor power and axial-power difference in commercial PWRs,and it needs to be calibrated regularly to ensure the accuracy.The conventional multi-point calibration method needs to move the control rods and measure the fluxmapping several times,which influences the economy and safety of power plants.Therefore,the single-point calibration method for the ex-core nuclear instrument system has been proposed in this paper,which combines both the theoretical calculation and measurement data.The axial offset correction factor and the ex-core detector sensitivity are introduced in this method.And the coreanalysis code is utilized to simulate the movement of control rods.Eventually,the calibration coefficients could be determined.Based on the single-point calibration method,the function development has been achieved in the core-analysis code SPARK,and it has been verified by the multiple cycles’measurement data from M310 reactor.The verification results indicate that the single-point calibration method proposed in this research has higher calibration accuracy.Compared with the measured power level and axial power difference,the average biases of calibration results are 0.31%and 0.16%,repectively.Therefore,the single-point calibration method is capable to determine the calibration coefficients accurately,and save calibration time without control rod movement.This method could improve the economy and safety of power plants and has the engineering application and popularization value.

关 键 词：堆外探测器 单点校刻法 多点校刻法 SPARK程序 

分 类 号：TL329[核科学技术—核技术及应用]