비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)
- 제18권6호
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- Pages.455-463
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- 1998
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- 1225-7842(pISSN)
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- 2287-402X(eISSN)
원자로 제어봉 End-Tip 원주방향균열 와전류검사
RCCA End-Tip Examination by ECT
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이희종
(한국전력공사 전력연구원 원자력연구실 원전설비지원그룹) ;
- 남민우 (한국전력공사 전력연구원 원자력연구실 원전설비지원그룹) ;
- 정계조 (한국전력공사 전력연구원 원자력연구실 원전설비지원그룹)
-
Lee, H.J.
(Nuclear Power Generation Research Lab., KEPRI, Korea Electric Power Corporation) ;
- Nam, M.W. (Nuclear Power Generation Research Lab., KEPRI, Korea Electric Power Corporation) ;
- Jung, G.J. (Nuclear Power Generation Research Lab., KEPRI, Korea Electric Power Corporation)
- 발행 : 1998.12.30
초록
경수로형 원자로 제어봉집합체(rod cluster control assembly)의 제어봉선단 봉단마개 부위에 발생할 수 있는 원주방향균열을 검출하기 위한 다중표면 와전류탐촉자를 설계하였으며, 이를 MIZ-30 주파수발생장치에 연 결하여 원주방향균열을 검출하고 원주방향길이를 측정 할 수 있는 와전류검사기술을 개발하였다.
RCCA(rod cluster control assembly) End-Tip suffers from neutron irradiation and constant vibration due to high-speed internal flow of primary coolant during plant operation. Such operating conditions cause the RCCA end-tip crackings around tile circumferential weldment of the end-tip, and in some cases, the defective end-tips were completly broken loose. However, no reliable inspection techniques for end-tip crackings were developed in the past, although some techniques exist for inspecting RCCA control rod wears. Therefore, NDE group at KEPRI has developed an ECT technique for the detection and the sizing of the end-tip crackings. The technique uses a specially designed surface-riding probe that can detect size of circumferential crackings with an accuracy of
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