抄録
At Fukushima Daiichi Nuclear Power Station, flange-type tanks which could be deployed in a short time were installed at the time of the disaster because it was necessary to store the increasing number of contaminated water securely. After a while, replacement of flange-type tanks to more reliable welded-type tanks has been carried out. In dismantling the flange-type tanks, loose radioactive material is fixed and prevented from scattering by coating of inner surface before the dismantling. This paper describes the development status of the method to prevent scattering of radioactive material by reducing (decontaminating) the loose radioactive material with irradiating the laser to inner surface of the flange type tanks instead of the coating carried out so far.
