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Nakanishi, Yoshiki; Nakagawa, Akinori; Sone, Tomoyuki; Sasaki, Toshiki; Nakazawa, Osamu; Tashiro, Kiyoshi
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no abstracts in English
and (U,Zr)O in a LiCl moltenNakayoshi, Akira; Kitawaki, Shinichi; Kofuji, Hirohide; Sakamura, Yoshiharu*; Akiyama, Naoyuki*
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Kobayashi, Hidekazu; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Amamoto, Ippei; Ayame, Yasuo
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no abstracts in English
Sato, Hiroyuki
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The present study reviews the safety analysis results of depressurized loss-of-forced cooling accident without scram, control simulations for load-following operations.
Kim, Jae-Hwan; Nakamichi, Masaru
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no abstracts in English
Oda, Yasuhisa; Sugawara, Shuhei*; Atsumi, Kohei*; Yamaguchi, Tomoki*; Saigusa, Mikio*; Sakamoto, Keishi
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no abstracts in English
Saito, Akihito*; Iwata, Masayuki*; Sato, Hayato*; Arai, Tsuyoshi*; Nagayama, Katsuhisa*; Suzuki, Tatsuya*; Horiguchi, Kenichi; Sugaya, Atsushi
no journal, ,
no abstracts in English
Aihara, Haruka; Hinai, Hiroshi; Nakajima, Yasuo
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Kumagai, Yuta; Nagaishi, Ryuji; Kimura, Atsushi; Taguchi, Mitsumasa; Nishihara, Kenji; Yamagishi, Isao
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The accumulated water in Fukushima Dai-ichi Nuclear Power Station contains salts from seawater and is treated by zeolite adsorbents. Thus, radiolysis of seawater and the hydrogen production in the presence of zeolites were studied. Seawater was irradiated by 
Co 
-rays. The produced amount of hydrogen and the concentration of hydrogen peroxide were measured. The concentrations of anions were also analyzed. The results show that the oxidation of hydrogen in aqueous phase was inhibited and the hydrogen by radiolysis totally transferred to the gas phase. Then, the hydrogen production in the presence of mordenite-type zeolite and zeolites supplied by KURION was investigated. The results show that the hydrogen production was suppressed by decreasing the amount of seawater. The difference among the zeolites was not significant. Therefore it was suggested that the hydrogen from the waste zeolite can be suppressed by maintaining the water content at low level.
Ohata, Fumikazu; Oyama, Koichi; Kaji, Naoya; Sano, Yuichi
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no abstracts in English
Iguchi, Masahide; Saito, Toru; Chida, Yutaka; Nakajima, Hideo; Koizumi, Norikiyo
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no abstracts in English
Kamiji, Yu
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In Fukushima-NPP, cesium adsorption apparatus is used to defecate radioactivities in polluted water. Zeolite as adsorbing material is set into adsorption vessel. The polluted water is led into the vessel and the cesium in the water is adsorbed. Spent vessel including zeolite is exchanged for new vessel and temporarily stored in storage facility. Residual water in the vessel is decomposed into hydrogen and oxygen by radiolysis. It is important to consider them for safety storage. It was proposed to install recombination catalyst in the vessel which can lead to recombine hydrogen and oxygen into water under ambient temperature and pressure. To apply the catalyst to the vessel, we tried to measured reaction rate of hydrogen by catalyst. In the experiments, hydrogen and oxygen mixed humid gas was led to catalyst and several temperature conditions were tested. They were found that hydrogen reaction rate was 100% for 80degree-celsious humid gas and over 50% under the dew condensation.
Wakui, Ryohei; Kitagaki, Toru; Higuchi, Hidetoshi; Koizumi, Kenji; Takeuchi, Masayuki; Washiya, Tadahiro
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no abstracts in English
Tanaka, Nobuyuki
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Effect of temperature on the proton permeability (conductivity and transport number) of ion exchange membrane in a HIx solution (HI-I-HO mixture) was investigated for an electro-membrane process in the thermochemical water-splitting iodine-sulfur process. A theoretical formula was derived on the basis of the Nernst-Planck equation. In order to confirm the validation, the experimental results were correlated with the obtained formula and the results showed good agreement. The temperature dependence of the conductivity and transport number was suggested to be determined by that of proton and iodide ion diffusion coefficient.
Noguchi, Hiroki
no journal, ,
The heat exchanger made by SiC ceramics has expanded the application in high temperature and corrosive condition in chemical plants. The heat transfer enhancement technology by nanostructure surface was applied for pressureless sintering SiC ceramics. Nanostructure surface by carbon nano tubes (CNT) generated by the surface decomposition was manufactured, and its convective heat transfer performance for water was acquired. As a result of comparing with the SiC, heat transfer enhancement of nanostructure surface could not be observed. It is thought to be related that the heat transfer surface changed from hydrophile to hydrophobic by the CNT processing.
Hemmi, Tsutomu; Matsui, Kunihiro; Koizumi, Norikiyo; Kajitani, Hideki
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Hemmi, Tsutomu; Kajitani, Hideki; Koizumi, Norikiyo; Nunoya, Yoshihiko; Harjo, S.
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Shimada, Asako; Nash, K.*; Kameo, Yutaka; Takahashi, Kuniaki
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no abstracts in English
Aburadani, Atsushi; Shigematsu, Soichiro; Tanigawa, Hisashi; Takeda, Nobukazu; Kakudate, Satoshi
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no abstracts in English
Ito, Tatsuya; Kim, S.-Y.*; Yamazaki, Hiromichi*; Ishii, Keizo*; Nagaishi, Ryuji; Kimura, Takaumi
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no abstracts in English