Laser Ultrasonic System for Surface Crack Visualization in Dissimilar Welds of Control Rod Drive Mechanism Assembly of Nuclear Power Plant
In this paper, we propose a J-groove dissimilar weld crack visualization system based on ultrasonic propagation imaging (UPI) technology. A full-scale control rod drive mechanism (CRDM) assembly specimen was fabricated to verify the proposed system. An ultrasonic sensor was contacted at one point of...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2014/296426 |
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| author | Yun-Shil Choi Hyomi Jeong Jung-Ryul Lee |
| author_facet | Yun-Shil Choi Hyomi Jeong Jung-Ryul Lee |
| author_sort | Yun-Shil Choi |
| collection | DOAJ |
| description | In this paper, we propose a J-groove dissimilar weld crack visualization system based on ultrasonic propagation imaging (UPI) technology. A full-scale control rod drive mechanism (CRDM) assembly specimen was fabricated to verify the proposed system. An ultrasonic sensor was contacted at one point of the inner surface of the reactor vessel head part of the CRDM assembly. Q-switched laser beams were scanned to generate ultrasonic waves around the weld bead. The localization and sizing of the crack were possible by ultrasonic wave propagation imaging. Furthermore, ultrasonic spectral imaging unveiled frequency components of damage-induced waves, while wavelet-transformed ultrasonic propagation imaging enhanced damage visibility by generating a wave propagation video focused on the frequency component of the damage-induced waves. Dual-directional anomalous wave propagation imaging with adjacent wave subtraction was also developed to enhance the crack visibility regardless of crack orientation and wave propagation direction. In conclusion, the full-scale specimen test demonstrated that the multiple damage visualization tools are very effective in the visualization of J-groove dissimilar weld cracks. |
| format | Article |
| id | doaj-art-59c7ac4f8abb4611ad1026e0e9611445 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-59c7ac4f8abb4611ad1026e0e96114452025-02-03T05:59:50ZengWileyShock and Vibration1070-96221875-92032014-01-01201410.1155/2014/296426296426Laser Ultrasonic System for Surface Crack Visualization in Dissimilar Welds of Control Rod Drive Mechanism Assembly of Nuclear Power PlantYun-Shil Choi0Hyomi Jeong1Jung-Ryul Lee2Department of Aerospace Engineering and LANL-CBNU Engineering Institute Korea, Chonbuk National University, 664-14 Deokjin-dong, Deokjin-gu, Jeonju, Jeollabuk-do 561-756, Republic of KoreaDepartment of Aerospace Engineering and LANL-CBNU Engineering Institute Korea, Chonbuk National University, 664-14 Deokjin-dong, Deokjin-gu, Jeonju, Jeollabuk-do 561-756, Republic of KoreaDepartment of Aerospace Engineering and LANL-CBNU Engineering Institute Korea, Chonbuk National University, 664-14 Deokjin-dong, Deokjin-gu, Jeonju, Jeollabuk-do 561-756, Republic of KoreaIn this paper, we propose a J-groove dissimilar weld crack visualization system based on ultrasonic propagation imaging (UPI) technology. A full-scale control rod drive mechanism (CRDM) assembly specimen was fabricated to verify the proposed system. An ultrasonic sensor was contacted at one point of the inner surface of the reactor vessel head part of the CRDM assembly. Q-switched laser beams were scanned to generate ultrasonic waves around the weld bead. The localization and sizing of the crack were possible by ultrasonic wave propagation imaging. Furthermore, ultrasonic spectral imaging unveiled frequency components of damage-induced waves, while wavelet-transformed ultrasonic propagation imaging enhanced damage visibility by generating a wave propagation video focused on the frequency component of the damage-induced waves. Dual-directional anomalous wave propagation imaging with adjacent wave subtraction was also developed to enhance the crack visibility regardless of crack orientation and wave propagation direction. In conclusion, the full-scale specimen test demonstrated that the multiple damage visualization tools are very effective in the visualization of J-groove dissimilar weld cracks.http://dx.doi.org/10.1155/2014/296426 |
| spellingShingle | Yun-Shil Choi Hyomi Jeong Jung-Ryul Lee Laser Ultrasonic System for Surface Crack Visualization in Dissimilar Welds of Control Rod Drive Mechanism Assembly of Nuclear Power Plant Shock and Vibration |
| title | Laser Ultrasonic System for Surface Crack Visualization in Dissimilar Welds of Control Rod Drive Mechanism Assembly of Nuclear Power Plant |
| title_full | Laser Ultrasonic System for Surface Crack Visualization in Dissimilar Welds of Control Rod Drive Mechanism Assembly of Nuclear Power Plant |
| title_fullStr | Laser Ultrasonic System for Surface Crack Visualization in Dissimilar Welds of Control Rod Drive Mechanism Assembly of Nuclear Power Plant |
| title_full_unstemmed | Laser Ultrasonic System for Surface Crack Visualization in Dissimilar Welds of Control Rod Drive Mechanism Assembly of Nuclear Power Plant |
| title_short | Laser Ultrasonic System for Surface Crack Visualization in Dissimilar Welds of Control Rod Drive Mechanism Assembly of Nuclear Power Plant |
| title_sort | laser ultrasonic system for surface crack visualization in dissimilar welds of control rod drive mechanism assembly of nuclear power plant |
| url | http://dx.doi.org/10.1155/2014/296426 |
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