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학술저널
저자정보
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대한기계학회 Journal of Mechanical Science and Technology KSME International Journal Vol.16 No.7
발행연도
2002.7
수록면
927 - 934 (8page)

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HANARO (High-flux Advanced Neutron Application Reactor) has been operated since 1995. The Cold Neutron (CN) hole was implanted in the reflector tank from the design stage. Before a vacuum chamber and a moderator cell for the cold neutron source are installed into the CN hole. it is necessary to measure exactly the size of the inside diameter and thickness of the CN hole to prevent the interference problem. Due to inaccessibility and high radiation field in the CN hole, a mechanical measurement method is not permitted. The immersed ultrasonic technique is considered as the best way to measure the thickness and the diameter of the CN hole. The 4-Axis manipulator was designed and fabricated for locating the ultrasonic sensors. The transducer of an ultrasonic sensor having 10M Hz frequency leads to high resolution as much as 0.03mm. The inside diameter and thickness of 550 points of the CN hole were measured
using 2 channel ultrasonic sensors. The results show that the thickness and inside diameter of the CN hole is in the range of 3.3-6.7㎜ and ? l56-165㎜. respectively. This data will be a good reference for the design of the cold neutron source facility.

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Abstract

1.Introduction

2.Surface Inspection in Radioactive Area

3.Ultrasonic Measurement Method

4.Measurement Test and Results Analysis

5.Conclusions

Acknowledgement

References

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