Ultrasonic guided wave parameters for detection of axial cracks in feeder pipes of PHWR nuclear power plants

Cheong, Yong Moo; Lee, Dong‐Hoon; Jung, Hyun-Kyu

doi:10.1016/j.ultras.2004.01.073

Cited by 47 publications

(24 citation statements)

References 10 publications

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“…Therefore, those components need a unique inspection method to achieve high safety demands. Nuclear power plant components inspection by Guided wave inspection method is presented such as nuclear power plant valves [2], pipes [3][4][5] and steam generator tube [6]. Nuclear power plants are inspected regular schedule based maintenance.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Interface Defects for Inaccessible Reactor Shrink Fit Nozzle Weld by Ultrasonic Wave

Lee

Cho

2017

Preprint

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An effective method to inspect inaccessible nuclear power facility by interface wave which propagate along the shrink fit boundary of reactor head is proposed in this study. Reactor head is relatively thick to inspect from the outside of reactor by conventional ultrasonic testing. The proposed interface wave can propagate a long distance from the fixed transducer position. The inside of nuclear reactor is limited to access due to the high radiation, so transducers are located at outside of nuclear facility and interface wave propagates into the nuclear reactor for defect detection. The numerical simulation and experiments were carried out to validate the effectiveness of the proposed interface wave inspection method. Various defect cases simulating field failures are also presented with satisfactory detectability by the proposed technique with the features for defect classification.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Interface Defects for Inaccessible Reactor Shrink Fit Nozzle Weld by Ultrasonic Wave

Lee

Cho

2017

Preprint

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“…Recently, PAUT was employed for precise defect detection and sizing [2]. Nuclear power plant components inspection by LRUT such as nuclear power plant valves [3,4], pipes [5][6][7][8][9][10] and steam generator tubes [11][12][13][14] has been reported. Control element driving mechanism (CEDM) nozzles are attached to and penetrate through the reactor head.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Interface Defects in Inaccessible Reactor Shrink Fit Nozzle Welds Using Ultrasonic Waves

Lee

Cho

2017

Energies

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Abstract:This study proposes an effective method to inspect inaccessible nuclear power reactor head nozzles using interface waves that propagate along the shrink fit boundary of a reactor head. The reactor head is relatively thick, which makes it difficult to inspect from the outside by conventional ultrasonic testing. However, interface waves can propagate a long distance from a fixed transducer position. The inside of the nuclear reactor has limited access due to the high radiation, so the transducers are located outside the nuclear reactor head, and interface waves propagate into the nuclear reactor to detect defects. A numerical simulation and experiments were carried out to validate the method. Various defect cases that simulate field failures are also presented, and the proposed technique shows satisfactory defect classification.

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“…Ultrasonic sensors are used for imaging in various fields of science and engineering, ranging from fetal scanners [1][2][3][4][5] to non-destructive testing and evaluation of nuclear power stations [6][7][8]. Ultrasound transducers are the components which generate and detect sound waves, converting electrical energy to mechanical energy (and vice versa) through vibrations induced on the transducer [9].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Performance of a Fractal Ultrasonic Transducer Under Varying System Conditions

2016

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Abstract:As applications become more widespread there is an ever-increasing need to improve the accuracy of ultrasound transducers, in order to detect at much finer resolutions. In comparison with naturally occurring ultrasound systems the man-made systems have much poorer accuracy, and the scope for improvement has somewhat plateaued as existing transducer designs have been iteratively improved over many years. The desire to bridge the gap between the man-made and naturally occurring systems has led to recent investigation of transducers with a more complex geometry, in order to replicate the complex structure of the natural systems. These transducers have structures representing fractal geometries, and these have been shown to be capable of delivering improved performance in comparison with standard transducer designs. This paper undertakes a detailed investigation of the comparative performance of a standard transducer design, and a transducer based on a fractal geometry. By considering how these performances vary with respect to the key system parameters, a robust assessment of the fractal transducer performance is provided.

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Ultrasonic guided wave parameters for detection of axial cracks in feeder pipes of PHWR nuclear power plants

Cited by 47 publications

References 10 publications

Evaluation of Interface Defects for Inaccessible Reactor Shrink Fit Nozzle Weld by Ultrasonic Wave

Evaluation of Interface Defects for Inaccessible Reactor Shrink Fit Nozzle Weld by Ultrasonic Wave

Evaluation of Interface Defects in Inaccessible Reactor Shrink Fit Nozzle Welds Using Ultrasonic Waves

Investigating the Performance of a Fractal Ultrasonic Transducer Under Varying System Conditions

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