Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Laser Peening Application for PWR Power Plants

비등수형 원자로 발전소에의 레이저 피닝 적용기술

  • Kim, Jong-Do (Division of Marine Engineering, Korea Maritime & Ocean University) ;
  • SANO, Yuji (Power and Industrial Systems Research and Development Center, Toshiba Corporation)
  • 김종도 (한국해양대학교 기관공학부) ;
  • 유지 사노 ((주)도시바 전력시스템사 전력.사회시스템기술개발센터)
  • Received : 2016.09.18
  • Accepted : 2016.09.29
  • Published : 2016.10.31
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Abstract

Toshiba has developed a laser peening system for PWRs(pressurized water reactors) as well after the one for BWRs(boiling water reactors), and applied it for BMI(bottom-mounted instrumentation) nozzles, core deluge line nozzles and primary water inlet nozzles of Ikata Unit 1 and 2 of Shikoku Electric Power Company since 2004, which are Japanese operating PWR power plants. Laser pulses were delivered through twin optical fibers and irradiated on two portions in parallel to reduce operation time. For BMI nozzles, we developed a tiny irradiation head for small tubes and we peened the inner surface around J-groove welds after laser ultrasonic testing (LUT) as the remote inspection, and we peened the outer surface and the weld for Ikata Unit 2 supplementary. For core deluge line nozzles and primary water inlet nozzles, we peened the inner surface of the dissimilar metal welding, which is of nickel base alloy, joining a safe end and a low alloy metal nozzle. In this paper, the development and the actual application of the laser peening system for PWR power plants will be described.

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References

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