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http://dx.doi.org/10.20466/KPVP.2019.15.1.046

Design and Test of ElectroMagnetic Acoustic Transducer applicable to Wall-Thinning Inspection of Containment Liner Plates  

Han, Soon Woo (한국원자력연구원 안전재료기술개발부)
Cho, Seung Hyun (한국표준과학연구원 안전측정센터)
Kang, To (한국원자력연구원 안전재료기술개발부)
Moon, Seong In (한국원자력연구원 안전재료기술개발부)
Publication Information
Transactions of the Korean Society of Pressure Vessels and Piping / v.15, no.1, 2019 , pp. 46-52 More about this Journal
Abstract
This work proposes a noncontact ultrasonic transducer for detecting wall-thinning of containment liner plates of nuclear power plants by measuring their thickness without physical contact. Because the containment liner plate is designed to prevent atmospheric leakage of radioactive substances under severe nuclear accident, its wall-thinning inspection is important for safety of nuclear power plants. Wall-thinning investigation of containment liner plates have been carried out by measuring their thickness with contact-type ultrasonic thickness gauge by inspectors and needs a lot of time and cost. As an alternative, an electromagnetic acoustic transducer measuring precisely thickness of containment liner plates without any physical contact or couplant was suggested in this research. A transducer generating and measuring shear ultrasonic waves in thickness direction was designed and wave field produced by the transducer was analyzed to verify the design. The working performance of the suggested transducer was tested with carbon steel plate specimens with various thicknesses. The test result shows that the proposed transducer can measure thickness of the specimens precisely without any couplant and implies that swift scanning of wall-thinning of containment liner plates will be possible with the proposed transducer.
Keywords
Containment liner plate; Electromagnetic Acoustic Transducer; Noncontact; Thickness measurement;
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