New laser decontamination technique for radioactively contaminated metal surfaces using acid-bearing sodium silicate gel

Kameo, Yutaka; Nakashima, Mikio; Hirabayashi, Takakuni*

Journal of Nuclear Science and Technology, 41(9), p.919 - 924, 2004/09

https://doi.org/10.3327/jnst.41.919

A new laser decontamination method utilizing a gel made from a sodium silicate solution and an acid was developed for removing radioactive nuclide incorporated into a surface oxide layer on metal waste. Decontamination tests were carried out using both simulated contaminated samples and pipe specimens cut from the primary coolant system of the Japan Power Demonstration Reactor. In the case of surface oxide layer consisting mainly of iron oxide, more than 99% of surface radioactivities were removed after two to three decontamination runs. In order to ascertain the role of laser irradiation on chemical reactions, chemical states of O and Fe in the oxide layer before and after decontamination were analyzed by X-ray photoelectron spectroscopy. It was found that the oxide layer was dissolved into the acid-containing gel, and the reaction was extensively promoted by the laser irradiation.

Chemical decontamination process with sulfuric acid-cerium(IV) for decommissioning; Decontamination of dismantled components

Suwa, Takeshi; ; ; Tachikawa, Enzo

Proc. of 1991 JAIF Int. Conf. on Water Chemistry in Nuclear Power Plants: Water Chemistry,91, p.737 - 742, 1991/00

no abstracts in English

Development of chemical decontamination process with sulfuric acid-cerium(IV) for decommissioning; Demmonstration test at JPDR recirculation system

Suwa, Takeshi; ; ; ; ; Hoshi, Michio; Sagawa, Chiaki; Yonezawa, Chushiro; ; ; et al.

Nihon Genshiryoku Gakkai-Shi, 30(11), p.1020 - 1029, 1988/11

https://doi.org/10.3327/jaesj.30.1020

no abstracts in English

Dissolution behavior of nickel ferrite in sulfuric acid; Cerium(IV) solution

; ; Tachikawa, Enzo

Boshoku Gijutsu, 36(4), p.204 - 209, 1987/04

https://doi.org/10.3323/jcorr1974.36.4_204

no abstracts in English

Development of chemical decontamination process with sulfuric acid-cerium(IV)for decommissioning; Single step process to dissolve chromium-rich oxides

; ; Tachikawa, Enzo

Journal of Nuclear Science and Technology, 23(7), p.622 - 632, 1986/00

https://doi.org/10.3327/jnst.23.622

no abstracts in English

Study of Chemical Decontamination of JRR-3 Primary Coolant Heavy Water System・Part2

; ; ; ; ;

JAERI-M 85-039, 26 Pages, 1985/03

JAERI-M-85-039.pdf:0.77MB

no abstracts in English

Investigation for Chemical Decontamination of JRR-3 Primary Cooling System,No.1; Chemical Decontamination by CAN DECON Process

; ; ; ; ; Horiki, Oichiro;

JAERI-M 8076, 33 Pages, 1979/02

JAERI-M-8076.pdf:1.13MB

no abstracts in English