Development of decontamination method for the concrete contaminated with C-14 nuclide in Fugen

Kitamura, Koichi ; Hayashi, Hirokazu ; Shimizu, Mitsumori*; Matsuo, Kiyoshi*; Namba, Haruyuki*; Murakami, Kazuo*

Planning and preparation on decommissioning of the Fugen Nuclear Power Plant have been carried out, and it is one of the most important issues to reduce amount of the radioactive waste for decreasing the disposal cost of them in the dismantling process. In Fugen, the concrete of the reactor building is penetrated with C-14 nuclide that was generated due to the activation of carbon dioxide during the plant operation. In this study, concrete samples were taken from the reactor building to survey how the concrete was contaminated by C-14 nuclide during the plant operation. Moreover, the estimation of the contamination mechanism with C-14 nuclide to the concrete and the study of the rational decontamination method were carried out.