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-ray emitting radioactive nuclides from the Fukushima Dai-ichi Nuclear Power Plant accidentSaito, Kimiaki; Tanihata, Isao*; Fujiwara, Mamoru; Saito, Takashi*; Shimoura, Susumu*; Otsuka, Takaharu*; Onda, Yuichi*; Hoshi, Masaharu*; Ikeuchi, Yoshihiro*; Takahashi, Fumiaki; et al.
Journal of Environmental Radioactivity, 139, p.308 - 319, 2015/01
Times Cited Count：243 Percentile：98.43(Environmental Sciences)Kawamura, Takumi*; Ito, Kei; Sakai, Takaaki; Nakajima, Masayoshi; Fujiwara, Koji; Ohshima, Hiroyuki
Nihon Genshiryoku Gakkai Wabun Rombunshi, 7(3), p.297 - 307, 2008/09
In a vitrification process of high level radio-active liquid wastes, platinum group particles are mixed into molted glass and convected with the glass flow in vitrification melters. Though behaviors of the particles in the melters should be investigated to establish efficient melter operation, difficulties on observations in the high-radioactive melters have prevented enough investigation. In this paper, we present a numerical analysis method to evaluate the particles behaviors. Since thermal convection of the molten glass, electrical potential and particle distribution are interacting each other, we coupled these physical behaviors to evaluate the melter status with high accuracy. The simulation results for ten batches of operation showed that an effective discharge of the particles can be achieved as well as the mock-up experiments did. These results imply that our numerical method can evaluate transient behaviors of the platinum group particles in vitrification melters.
Kuboki, Michikatsu; Naito, Masakazu; Sumi, Hirotaka; Nakayama, Jiro; Kano, Shigeru; Niitsuma, Koichi; Kodaka, Akira; Fujiwara, Koji
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Sumi, Hirotaka; Nakayama, Jiro; Kuboki, Michikatsu; Kodaka, Akira; Fujiwara, Koji
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Michishio, Koji*; Fujiwara, Takeshi*; Hirade, Tetsuya
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Michishio, Koji*; Fujiwara, Takeshi*; Hirade, Tetsuya
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Shimbara, Shigehiro; Fujiwara, Koji; Kozaka, Tetsuo; Ueno, Tsutomu; Aoshima, Atsushi
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Ito, Yoshiyuki; Ikegami, Yasushi; Suda, Masanori; Shimbara, Shigehiro; Fujiwara, Koji
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The off gas from the TVF glass melter was washed by the scrubber and the Venturi Scrubber, but boric acid in the off gas was put on the pipe of the off gas scrubber. Differential presser of the Venturi Scrubber was increased by the vitrification process. The mechanism was investigated, therefore the spray from the scrubber was sent up to the off gas line, the spray was dried with the vitrification cell air, because the vitrification cell air was low humidity, the humidity is 15 percent. And the boric acid in the spray was extracted, and the extraction was carried to the entrance of the venturi scrubber. And also, by the check experiment of the washing method, it was confirmed that the confluence line of vitrification cell air was effectively washed.
Takaya, Akikazu; Kato, Junya; Fujiwara, Koji; Ueno, Tsutomu
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Kato, Junya; Takaya, Akikazu; Fujiwara, Koji; Isozaki, Koei
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Nakayama, Jiro; Sumi, Hirotaka; Kuboki, Michikatsu; Kodaka, Akira; Fujiwara, Koji
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Sumi, Hirotaka; Ito, Yoshiyuki; Fujiwara, Koji; Ueno, Tsutomu
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Nakazaki, Katsutoshi; Takaya, Akikazu; Kato, Junya; Kobayashi, Masahiro; Matsumura, Tadayuki; Niitsuma, Koichi; Fujiwara, Koji
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Matsumura, Tadayuki; Takaya, Akikazu; Sumi, Hirotaka; Ishii, Kiyonori; Niitsuma, Koichi; Kodaka, Akira; Fujiwara, Koji
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Nakatani, Takayoshi; Kozaka, Tetsuo; Niitsuma, Koichi; Fujiwara, Koji; Semba, Yasunari; Abe, Shinya
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Sasage, Kenichi; Kobayashi, Hidekazu; Ayame, Yasuo; Fujiwara, Koji; Shiotsuki, Masao; Miura, Nobuyuki
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Fujiwara, Koji
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Kato, Junya; Nakazaki, Katsutoshi; Takaya, Akikazu; Matsumura, Tadayuki; Niitsuma, Koichi; Kodaka, Akira; Fujiwara, Koji
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