[1A09-14] Treatment Technology of Concrete and Metal

[1A13] Development of high-power density, high-speed scanning laser decontamination technology

(1) Experimental evaluation of metal surface delamination

*Atsushi Kosuge¹ (1. JAEA)

Keywords:Fiber Laser, High power density, Laser Decontamination, Decontamination mechanism, High-speed scanning

A large amount of radioactive waste is generated during the decommissioning of nuclear reactors that have completed their operational period. Efficient decontamination of metal parts such as reactor piping can reduce the amount of waste and significantly lower storage costs. Decontamination using lasers is non-contact, can be operated remotely, and can significantly suppress secondary waste generation. We are developing a laser decontamination technique using instantaneous evaporation by focusing a high-power continuous-wave fiber laser to a small spot size and sweeping it at high speed with high power density, and are conducting experimental and analytical evaluations.In this presentation, samples were laser irradiated under various laser irradiation conditions, and the depth of melting was observed by cross-sectional measurement and surface observation of metal ablation. Simulated decontamination tests were also conducted by measuring fluorescence spectral intensity using fluorescent paint as a simulated contaminant, and changes in the amount of removal due to laser irradiation conditions were investigated.