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Kobayashi, Kazuhiro; Hayashi, Takumi; Nishi, Masataka; Oya, Yasuhisa*; Okuno, Kenji*
Fusion Engineering and Design, 81(8-14), p.1379 - 1384, 2006/02
Times Cited Count：5 Percentile：36.24(Nuclear Science & Technology)In facilities of ITER, various construction materials are possibly exposed by tritium during periodical maintenances and an accident. It is required to establish the effective surface decontamination methods for the above construction materials of ITER. In tritium decontaminating, so-called "soaking" effect is important. This effect is based on sorption of tritiated water on the materials and subsequent desorption from them. In order to obtain and summarize data on the amount of tritium adsorption on the various materials, a series of tritiated water vapor exposure experiments have been carried out as a function of time. The amounts of tritium adsorption on the materials saturated almost within the period from several weeks to 1 month. The adsorption rate of the epoxy was found to be the largest. In the exposure time less than 2 hrs, the adsorption coefficients for the examined materials were found to be in the same order as those reported by F.Ono. It will be also discussed from viewpoint of kinetics for adsorption and desorption.
Saeki, Masakatsu
JAERI-Review 2004-011, 54 Pages, 2004/03
JAERI-Review-2004-011.pdf:5.21MB
In this review, experimental results on studies of radioactive iodine, tritium and neptunium are summarized. On studies of radioactive iodine, from various experimental results, the process establishing the formation mechanism of organic iodides was fully described. On the basis of formation mechanism, possibilities for the formation of organic iodides under nuclear reactor accidents and so on were also discussed. On studies of tritium, three topics were concisely described on the isotopic composition of tritium gases, the chemical forms and the diffusivity of tritium in various materials, and the sorption and desorption behaviors of tritium on surfaces of various materials. On the neptunium chemistry, the relationship between the structure of neptunium compound and the Moessbauer isomer shift and experimental results on neptunyl(VI) hydroxides were discussed.
Kobayashi, Kazuhiro; Hayashi, Takumi; Iwai, Yasunori; Nishi, Masataka
Fusion Engineering and Design, 58-59, p.1059 - 1064, 2001/11
Times Cited Count：11 Percentile：61.93(Nuclear Science & Technology)no abstracts in English
Takebe, Shinichi; Mukai, Masayuki; Komiya, Tomokazu; Kamiyama, Hideo
JAERI-M 92-205, 19 Pages, 1993/01
no abstracts in English
Saeki, Masakatsu; Hirabayashi, Takakuni; Aratono, Yasuyuki; Nakashima, Mikio; ; Tachikawa, Enzo
Fusion Technology, 21, p.806 - 811, 1992/03
no abstracts in English
Saeki, Masakatsu
Kaku Yugoro, 19, p.6 - 10, 1987/00
no abstracts in English
Kurasawa, T.; ; ;
JAERI-M 86-152, 81 Pages, 1986/10
no abstracts in English
