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Containment Liner Plate Void Defect Detection Technique Using Phased Array Ultrasonic Testing and Acoustic Resonance

Yun-Taek Yeom¹, Yeong-Won Choi¹, Hak-Joon Kim¹

¹School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea.

Materials (Basel, Switzerland)

|February 25, 2022

Summary

This summary is machine-generated.

Nuclear power plant containment liner plates (CLP) face defects like corrosion and voids. This study introduces new phased array ultrasonic and acoustic resonance methods for defect detection and proposes an automated inspection system.

Keywords:

ARM PAUT containment liner plate signal mapping void defect

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Area of Science:

Nuclear Engineering
Materials Science
Structural Health Monitoring

Background:

Containment liner plates (CLP) are critical nuclear power plant structures for safety and radioactive material containment.
Corrosion and concrete voids behind the liner plate are significant defects identified in South Korean nuclear facilities.
Existing inspection methods may not adequately address these specific rear-side CLP defects.

Purpose of the Study:

To develop and propose novel inspection methodologies for detecting defects in nuclear power plant containment liner plates.
To enhance the accuracy and efficiency of identifying corrosion and concrete voids within the CLP structure.
To introduce an automated system for comprehensive inspection of the internal CLP.

Main Methods:

Application of phased array ultrasonic testing (PAUT) for line-type inspection of the CLP.
Utilization of an acoustic resonance method with a developed movable tapper for area-based inspection.
Signal processing of acoustic data to generate mapping images for defect visualization and characterization.

Main Results:

Successful differentiation of defect types (corrosion, voids) through processed acoustic signal mapping.
Demonstration of the effectiveness of combined PAUT and acoustic resonance for defect detection.
Development of a prototype for an automated inspection system for internal CLP assessment.

Conclusions:

The proposed inspection methods provide a viable solution for identifying critical defects in nuclear power plant containment liner plates.
The developed acoustic resonance and PAUT techniques enable precise defect localization and characterization.
The automated inspection system offers potential for improved safety and maintenance efficiency in nuclear facilities.