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Report No.

Development of pulse laser processing and related technologies in maintenance for atomic power plants

Nishimura, Akihiko  ; Yonemoto, Yukihiro; Shimada, Yukihiro

Femtosecond laser pulses ablated a thin layer on the stainless steel surface where tensile stress had been mechanically induced. Thermal damage was strongly restricted by femtosecond laser pulses. The surface condition after laser ablation turned to be compressive gradually, which indicated a tolerance for Stress Corrosion Cracking. The laser processing application successfully produced two research directions for maintenance of nuclear power plants. One research direction was the fabrication of fiber Bragg grating. The other research direction was the development of prototype new probing system for heat exchanger by laser micro welding. It is the prototype probing system. Up to now, we have been working on both research directions in the new organization in Tsuruga since November 2009.



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