Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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A Study about Detection of Defects in the Nuclear Piping Loop System Using Cooling Lock-in Infrared Thermography

원전 배관 루프시스템의 냉각 위상잠금 적외선열화상을 이용한 결함 검출에 관한 연구

  • 김상채 (조선대학교 기계시스템공학과) ;
  • 강성훈 (조선대학교 기계시스템공학과) ;
  • 윤나연 (조선대학교 기계시스템공학과) ;
  • 정현철 (조선대학교 기계시스템공학과) ;
  • 김경석 (조선대학교 기계시스템공학과)
  • Received : 2015.08.27
  • Accepted : 2015.10.26
  • Published : 2015.10.30
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Abstract

A study on the application of cooling defect detection was performed on the basis of a preceding study on the heated defect detection in nuclear piping loop system, using lock-in infrared thermography. A loop system with piping defects was made by varying the wall-thinning length, the circumference orientation angle, and the wall-thinning depth. The test was performed using an IR camera and a cooling device. Distance between the cooling device and the target loop system was fixed at 2 m. For analyzing experimental results, the temperature distribution data for cooling, and phase data were obtained. Through the analysis of this data, the defect length was measured. The reliability of the measurements for cooling defect conditions was shown to be higher in the lock-in infrared thermography data than the infrared thermography data.

냉각 위상잠금 적외선열화상 기법을 이용하여 원전 배관 루프시스템의 가열결함 검출의 선행연구를 통하여 냉각결함 검출조건의 적용에 관한 연구를 수행하였다. 배관의 결함가공은 감육 길이, 감육 깊이를 변화시켜 결함조건을 가공하여 루프시스템을 제작하였다. 사용된 장비는 적외선열화상 카메라와 냉각장치를 사용하였으며 냉각장치와 대상 루프시스템과의 거리는 2m로 고정시켜 실험을 수행하였다. 실험 결과의 분석을 위하여 냉각온도 분포, 위상데이터를 확보하고, 이를 분석하여 결함 길이를 측정하였다. 냉각결함 검출조건은 적외선열화상 데이터보다 위상잠금 적외선열화상 데이터가 측정 결과의 신뢰도가 높았다.

Keywords

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