基于涡流技术的燃料棒氧化膜测量信号有效性评估与统计  

Effectiveness Assessment and Statistics of Eddy Current Signal in Measuring Oxide Layer of Fuel Rods

作　　者：程曦 周国正[1] 唐西明[1] 梁军[1] 赵博文 Cheng Xi;Zhou Guozheng;Tang Ximing;Liang Jun;Zhao Bowen(Suzhou Nuclear Power Research Institute Co.Ltd.,Shenzhen,Guangdong,518026,China)

机构地区：[1]苏州热工研究院有限公司,广东深圳518026

出　　处：《核动力工程》2020年第1期49-53,共5页Nuclear Power Engineering

摘　　要：应用统计学中的中位数、四分位距概念并结合实践经验,研究了燃料棒氧化膜涡流测量信号在线及离线处理流程的优化方法,提出了使用标定信号检验结合氧化膜轴向变化趋势图进行在线的燃料棒氧化膜信号有效性评估,以减少事后复测带来的频繁吊运燃料组件的问题。同时,在对燃料棒氧化膜涡流信号进行离线统计时发现,相对平均数统计,中位数统计可以排除极端信号的干扰,燃料棒轴向长约150mm区域段的氧化膜厚度数据的四分位距多数分布于0~3μm。结果表明,使用中位数可以准确、直观地代表各个区域段的氧化膜厚度水平。This paper studied the optimization of online and offline ET signal processing procedure in oxide layer measurement of fuel rods by utilization of median, interquartile range and on-site inspection experience. Online verification by the calibration signal combined with the oxide layer prediction curve are proposed to assess the effectiveness of the acquisition signal. By this way, the problem of handling fuel assembly frequently can be improved. In addition, it is found that the median statistics can avoid the interference of extreme signal compared with average statistics. And most of the average interquartile range of divided 150 mm parts of three fuel rods is between 0~ 3 μm. The results indicate that the oxide layer thickness level of each part can be represented well by the median.

关 键 词：燃料棒氧化膜 涡流信号 有效性评估 中位数 四分位距 

分 类 号：TL352[核科学技术—核技术及应用]