[1B10-15] Cutting and Decontamination

[1B10] Laser decontamination mechanism using high-speed scanning of high-power density continuous wave fiber laser and high speed camera

(1)Laser decontamination of concrete surface

*Atsushi Kosuge¹, Eisuke J. Minehara² (1. JAEA, 2. LDD Corporation)

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

In the decommissioning of nuclear reactors, it is possible to reduce the amount of radioactive wastes and significantly reduce the storage cost by efficiently decontaminating the contaminated concrete used in the reactor building. Conventional decontamination methods have some disadvantages. Laser decontamination has been shown to be non-contact, remote-controlled, especially capable of a decontamination coefficient of 100%, and significantly suppresses the generation of secondary wastes. Irradiation of the concrete surface with a laser causes the formation of a glass layer on the surface, thermal fracturing, and an explosive fracture by water and carbonate. In this study, we explain observations for elucidating the surface peeling mechanism of the concrete surface layer using high-speed scanning of a high-power density continuous-wave fiber laser.