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Kobayashi, Yuki; Takahashi, Tetsuro; Shinozaki, Tadahiro; Ogasawara, Koji; Koizumi, Kenji; Nakajima, Yasuo
Nihon Hozen Gakkai Dai-7-Kai Gakujutsu Koenkai Yoshishu, p.161 - 166, 2010/07
The negative pressure control valve is reliable apparatus which has been used in many nuclear facilities. In recent years, there are some troubles on those valves in CPF (Chemical Reprocessing Facility) by the aged deterioration because the valves were kept using for more than 25 years after facility had operated. Therefore, we have been carrying out renewal of driving units of the valves to assure performance of negative pressure control function and to keep stability of operation of the facility. In this presentation, we report knowledge provided through the renewal work, such as the renewal procedure, the deterioration situation of components and the cause of troubles.
Kitawaki, Shinichi; Shinozaki, Tadahiro; Fukushima, Mineo; Usami, Tsuyoshi*; Yahagi, Noboru*; Kurata, Masaki*
Nuclear Technology, 162(2), p.118 - 123, 2008/05
Times Cited Count：18 Percentile：74.54(Nuclear Science & Technology)A series test of pyro-process was carried out to recover U-Pu alloy from MONJU MOX pellets. In the Li-reduction step, the reduction behavior of MOX was similar to that of UO
. In the electrorefining step, the separation factor between U and Pu was 5.7 for the combination of reduced MOX anode and liquid cadmium cathode, which is almost comparable to the value in the previous studies. For the material balance, approximately 98% of U and 103% of Pu were detected in the electrodes or molten salt after the electrolysis with respect to the initial amounts in the anode or molten salt. Considering the analytical error of ICP-AES, these values are reasonable. The remained amount of U in the anode was slightly larger than that of Pu due to the re-oxidation. The U-Pu alloy ingot was successfully formed by distillation of Cd.
Koyama, Tadafumi*; Hijikata, Takatoshi*; Usami, Tsuyoshi*; Inoue, Tadashi*; Kitawaki, Shinichi; Shinozaki, Tadahiro; Fukushima, Mineo; Myochin, Munetaka
Journal of Nuclear Science and Technology, 44(3), p.382 - 392, 2007/03
Times Cited Count：24 Percentile：82.59(Nuclear Science & Technology)Electrometallurgical pyroprocessing is a promising technology to realize actinide fuel cycle. Integrated experiments to demonstrate electrometallurgical pyroprocessing of plutonium oxide in continuous operation were carried out. In each test, 10 to 20 g of PuO was reacted with Li reductant to form metal product. The reduction products were charged in the anode basket of the electrorefiner with LiCl-KCl-UCl
electrolyte. With using the anodes, deposition of uranium on the solid cathode was carried out, when PuCl concentration was low. After Pu/U ratio in salt electrolyte was increased enough, plutonium and uranium were recovered simultaneously on the liquid cadmium cathode. By heating up the deposits for distillation of the salt and the cadmium, U metal or Pu-U alloyed metal were obtained as residues in the crucible. It was first result to demonstrate the recovery of metal actinides in the continuous operation of pyroprocessing of oxide fuels.
Kitawaki, Shininchi; Shinozaki, Tadahiro; Fukushima, Mineo; Hijikata, Takatoshi*; Usami, Tsuyoshi*; Koyama, Tadafumi*
Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 5 Pages, 2005/10
Electrometallurgical pyroprocess is a key innovative technology to realize closed actinides cycle with keeping high proliferation-resistance and economy. JNC and CRIEPI have been carrying out the integrated tests of electrometallurgical reprocessing of metal and oxide Pu-containing fuel to demonstrate whole process in continuous operation. After intensive cold test to confirm the functions of experimental apparatus and the test conditions, recovery test of actinide metal product from actinide oxide fuels has started as a first series of the integrated tests. In this report, result of the recovery test is described to elucidate the material flow in the process.
Kitawaki, Shinichi; Shinozaki, Tadahiro; Fukushima, Mineo; Usami, Tsuyoshi*; Yahagi, Noboru*; Kurata, Masaki*
no journal, ,
no abstracts in English
Usami, Tsuyoshi*; Kurata, Masaki*; Yahagi, Noboru*; Kitawaki, Shinichi; Shinozaki, Tadahiro; Fukushima, Mineo
no journal, ,
no abstracts in English
Yahagi, Noboru*; Usami, Tsuyoshi*; Kurata, Masaki*; Kitawaki, Shinichi; Fukushima, Mineo; Shinozaki, Tadahiro
no journal, ,
no abstracts in English
Kurata, Masaki*; Usami, Tsuyoshi*; Yahagi, Noboru*; Kitawaki, Shinichi; Fukushima, Mineo; Shinozaki, Tadahiro
no journal, ,
no abstracts in English
Aose, Shinichi; Ogasawara, Koji; Nomura, Kazunori; Miyachi, Shigehiko; Ichige, Yoshiaki; Shinozaki, Tadahiro; Ouchi, Shinichi; Kitajima, Takafumi
no journal, ,
no abstracts in English
Aose, Shinichi; Kitajima, Takafumi; Ogasawara, Koji; Nomura, Kazunori; Miyachi, Shigehiko; Ichige, Yoshiaki; Shinozaki, Tadahiro; Ouchi, Shinichi; Nabemoto, Toyonobu*; Katahira, Fujio*; et al.
no journal, ,
no abstracts in English
Kobayashi, Yuki; Takahashi, Tetsuro; Shinozaki, Tadahiro; Ogasawara, Koji; Koizumi, Kenji; Nakajima, Yasuo
no journal, ,
The negative pressure control valve is reliable apparatus which has been used in many nuclear facilities. In recent years, there are some troubles on those valves in CPF (Chemical Reprocessing Facility) by the aged deterioration because the valves were kept using for more than 25 years after facility had operated. Therefore, we have been carrying out renewal of driving units of the valves to assure performance of negative pressure control function and to keep stability of operation of the facility. In this presentation, we report knowledge provided through the renewal work, such as the renewal procedure, the deterioration situation of components and the cause of troubles.
Kobayashi, Yuki; Funakoshi, Tomomasa; Shinozaki, Tadahiro; Shibata, Atsuhiro; Nomura, Kazunori
no journal, ,
no abstracts in English
Kobayashi, Yuki; Funakoshi, Tomomasa; Shinozaki, Tadahiro; Watanabe, So; Yajima, Hiroshi*; Masaoka, Hideki*; Saitani, Akihiro*
no journal, ,
The Chemical Processing Facility (CPF) has the concrete-shielded hot-cells using the mercury lamps. However, all the production, export and import of the mercury lamp have been prohibited since 2021 by the Minamata Convention on Mercury, and substitutes of the lamps are required. In this study, the LED lamps with high resistance against exposure to the irradiation and the chemicals are developed for a substitute of the mercury lamp. As the results, newly developed high resistance LED lamps can be operated continuously for more than 20 years under the environment in the respect of the irradiation resistance. Use of the LED lamps will reduce the operational cost and the amount of wastes of the facility. Practical demonstration of the lamps in the hot-cells of the CPF will be performed in near future. lamps will reduce the operational cost and the amount of wastes of the facility. Practical demonstration of the lamps in the hot-cells of the CPF will be performed in near future.
船越 智雅; 篠崎 忠宏; 小林 雄樹; 薩田 将年
矢島 裕史*; 正岡 秀樹*; 村上 昭二*
JP, 2021-049719 
Patent licensing information
【課題】原子力施設で用いるのに適したランプを提供する。 【解決手段】耐放射線直管型LEDランプ(10)は、表面に無機絶縁反射膜が形成された光源基板、及び光源基板の無機絶縁反射膜上に実装されたLED素子を有する光源部(12)と、前面で光源部を支持し、背面に複数のフィン(11C)が立設されたヒートシンク(11)と、ヒートシンクの長手方向の両側の端面それぞれに取り付けられて、電力が供給されるソケットに着脱される口金(13A,13B)と、ヒートシンクの端面及び口金の間に配置されるリングパッキン(14A,14B,15A,15B)と、口金及びLED素子を電気的に接続する導電線(28A,28B)とを備え、ヒートシンクは、端面と前面とに開口する内部通路(11F,11G)を有し、導電線は、リングパッキンの内側及び内部通路を通って、口金及びLED素子を電気的に接続する。
