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Swept-frequency ET and Innovative Feature Extraction of Abrasion Defects for Thimble Tubes in Nuclear Power Plants |
ZHANG Lei1;LIU Wujun3;XIE Shejuan1,4;WANG Xiaogang2;KONG Yuying2;MA Qiang2;CHEN Zhenmao1 |
1. State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Research Center of Nondestructive Testing and Structural Integrity Evaluation, Xi’an Jiaotong University, Xi’an,710049
2. CGN Inspection Technology Co., Ltd., Suzhou,Jiangsu,215021
3. Xinte Energy Co., Ltd., Urumqi, 830011
4. Xinjiang Uygur Autonomous Region Special Equipment Inspection and Research Institute, Urumqi, 830011 |
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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.
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