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Tamura, Koji*; Toyama, Shinichi
Nihon Genshiryoku Gakkai-Shi ATOMO, 61(5), p.413 - 415, 2019/05
In decommissioning of nuclear reactors, it is necessary to disassemble the nuclear reactor structure. In addition to the conventional cutting method, the laser method has many advantages such as remote controllability and no need for replacement parts such as blades, which can be a powerful choice. Nuclear reactor structure such as a pressure vessel are made of steel materials with a thickness exceeding 100 mm, and the laser method has poor knowledge and experience in cutting such thick steel materials. Therefore, as a result of trial cutting of steel materials under various cutting conditions with the high power fiber laser which is progressively available nowadays, it has been demonstrated that laser cutting is also possible for thick plates such as those used in nuclear reactors, and cutting of thick steel plates. We also developed the cutting technology using remote control using a robot in order to apply it to the decommissioning of thick steel cutting on the spot.
Tamura, Koji; Ishigami, Ryoya*
no journal, ,
The laser cutting of thick steel plates with 30 kW fiber laser has been developed. Output of the introduced fiber laser (30 kW, IPG YLS-30000) was collimated with a pair of focusing lens, and was irradiated to stainless steel and carbon steel plates, which were transferred at a constant speed. Assist gas of air at a flow rate of about 500 l/min was used. It was demonstrated in this experiment that thick stainless steel plates up to 300 mm and carbon steel plates up to 300 mm were successfully cut. These results are quite promising for the application of laser cutting to the actual nuclear decommissioning.