Swept-frequency ET and Innovative Feature Extraction of  Abrasion Defects for Thimble Tubes in Nuclear Power Plants

doi:10.3969/j.issn.1004-132X.2021.01.003

Abstract

Abstract: To avoid reactor coolant leakage because of abrasion defects of thimble tubes in nuclear power plants from micro-vibration abrasion, the depths of abrasion defects needed to be accurately quantified. A finite element model of thimble tubes ET was established. The effects of depth, axial length and circumferential angle of abrasion defects of thimble tubes on ET signals were analyzed by simulation. Results show that the phase angle features of ET signals are not independently related to the defect depths，which means that conventional single frequency ET may lead to large errors of defect depths. Thus, a swept-frequency ET method was proposed for abrasion defects of thimble tubes, and an innovative feature namely zero-crossing frequency feature was extracted. Results of simulation analysis show that zero-crossing frequency feature is highly independently related to the defect depths.

Key words: thimble tube, depth of abrasion defect, swept-frequency eddy-current testing(ET), zero-crossing frequency feature

摘要： 为避免核电站指套管在微振磨蚀作用下产生磨损缺陷导致反应堆冷却剂泄漏，需要精确定量指套管磨损缺陷深度。建立了指套管涡流检测的有限元模型，通过仿真分析了指套管磨损缺陷的深度、轴向长度、周向角度对涡流检测信号的影响，结果表明涡流检测信号的相位角特征与缺陷深度不是独立相关的，使用常规单频涡流检测方法会导致缺陷深度误差过大。基于此提出了指套管磨损缺陷的扫频涡流检测方法，并从中提取了创新型特征，即过零频率特征。仿真分析结果表明过零频率特征与缺陷深度高度独立相关。

关键词: 指套管, 磨损缺陷深度, 扫频涡流检测, 过零频率特征

CLC Number:

TG115.28

ZHANG Lei1;LIU Wujun3;XIE Shejuan1,4;WANG Xiaogang2;KONG Yuying2;MA Qiang2;CHEN Zhenmao1. Swept-frequency ET and Innovative Feature Extraction of Abrasion Defects for Thimble Tubes in Nuclear Power Plants[J]. China Mechanical Engineering, DOI: 10.3969/j.issn.1004-132X.2021.01.003.

张磊1;刘武军3;解社娟1,4;王小刚2;孔玉莹2;马强2;陈振茂1. 核电站指套管磨损缺陷的扫频涡流检测及创新型特征提取[J]. 中国机械工程, DOI: 10.3969/j.issn.1004-132X.2021.01.003.

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Swept-frequency ET and Innovative Feature Extraction of Abrasion Defects for Thimble Tubes in Nuclear Power Plants

核电站指套管磨损缺陷的扫频涡流检测及创新型特征提取

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