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증기발생기 전열관의 비파괴 탐상용 차등형 와전류 탐촉자 개발
정선영(S. Y. Jung),손대락(D. Son),유권상(K. S. Ryu),박덕근(D. K. Park) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.5
Steam generator of a nuclear power plant has important rolls for the heat transfer and the isolation of radioactive materials. So bursting of the steam generator tube is directly related to the accident of nuclear power plants. Inconel600 has been used for the steam generator tube material. The material shows non-magnetic and metallic properties, eddy current NDT method has been employed for defects detection. In this work, a differential type of eddy current probe was developed to improve resolution of defect detection. To verify properties of the developed differential type eddy current probe, we have made reference material with SUS304 which has similar magnetic and electrical properties of Inconel600. Using the developed differential type eddy current probe, we can detect defect size of 0.25 ㎜ in diameter and 0.2 ㎜ in depth (volume of 1×10-³ ㎣) with the reference material.