Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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An Experimental Study on Drilling Conditions for the Instrumentation of Nuclear Fuel

핵연료 계장을 위한 천공조건에 대한 실험적 연구

  • 홍진태 (한국원자력연구원 중성자이용기술개발부) ;
  • 김가혜 (한국원자력연구원 중성자이용기술개발부) ;
  • 정황영 (한국원자력연구원 중성자이용기술개발부) ;
  • 안성호 (한국원자력연구원 중성자이용기술개발부) ;
  • 정창용 (한국원자력연구원 중성자이용기술개발부)
  • Received : 2012.09.12
  • Accepted : 2012.10.10
  • Published : 2013.01.01
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Abstract

To develop a new nuclear fuel, it needs to make a test fuel rod and carry out burn-up test in the test loop of a research reactor to check the irradiation characteristics of the nuclear fuel. At that time, several sensors such as thermocouples, LVDTs and SPNDs are needed to be attached in and out of the fuel rod and connect them with instrumentation cables. Then, the instrumentation cables deliver the signals measured by the sensors to the measuring device located outside of the reactor pool. In particular, to install a thermocouple in a fuel rod, it needs to drill off holes on the alumina blocks and sintered $UO_2$ pellets. However, because the hardness of a sintered $UO_2$ pellet is 700 Hv (or HRC 61) and that of an alumina block is 1480 Hv, a special drilling machine which adapts a diamond coated drill bit had developed. In this study, several case experiments have been carried out to find an optimal drilling condition of the drilling machine. And, using the optimal drilling condition, minimum numbers of the holes that a drill bit can drill off are verified.

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References

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