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Kato, Atsushi; Nagai, Keiichi; Ara, Kuniaki; Otaka, Masahiko; Oka, Nobuki*; Tanaka, Masako*; Otani, Yuichi*; Ide, Akihiro*
Proceedings of 2017 International Congress on Advances in Nuclear Power Plants (ICAPP 2017) (CD-ROM), 8 Pages, 2017/04
In a fuel handling system (FHS) of a sodium-cooled fast reactor, it is necessary to reduce residual sodium on a spent fuel subassembly before storing at a spent fuel water-pool (SFP) in order to minimize design loads. Although the wet cleaning process adopted on MONJU could eliminate almost all of residual sodium, a large amount of radioactive liquid waste occurs and it needs long duration of cleaning treatment and large plant commodities. On the other hand, Japan sodium-cooled fast reactor adopted an advanced dry cleaning system which consists of roughly blowing massive sodium on the fuel subassembly out by 300
C argon gas, inactivation of residual sodium to NaOH by moist argon gas and directly immersion into the SFP to achieve economic competitiveness and waste reduction. This paper reports current status of recent R&D activities to demonstrate a performance of the dry cleaning process in Japan which are for improvement of the cleaning performance and optimizing the FHS design.
Iwai, Yasunori; Oka, Nobuki*; Yamanishi, Toshihiko
Journal of Physics and Chemistry of Solids, 70(5), p.881 - 888, 2009/05
Times Cited Count：9 Percentile：39.82(Chemistry, Multidisciplinary)The influence of the framework SiO
/AlO
ratio from 2.0 to 10.0 of faujasite-type CaX/CaY zeolites on the water adsorption and desorption characteristics was examined. Not only the change in electronegativity but the change in pore size distribution of the zeolite affects the water adsorption and desorption characteristics of the zeolite. We found the great differences in isotherms of water on CaY7.0 (SiO/AlO = 7.0) and on CaY10.0. A step-wise variation was observed in the desorption isotherm of water from CaY10.0. We judged the phenomenon due to the pore distribution rich in meso-pores, since similar phenomenon is observed in the case of the argon adsorption on CaY10.0.
Saito, Junichi; Ara, Kuniaki; Sugiyama, Kenichiro*; Kitagawa, Hiroshi*; Oka, Nobuki*; Yoshioka, Naoki*
Proceedings of 15th International Conference on Nuclear Engineering (ICONE-15) (CD-ROM), 5 Pages, 2007/04
Liquid sodium is used as the coolant of the fast breeder reactor (FBR), because of its high thermal conductivity and wide temperature range of liquid. However the chemical reactivity with water and oxygen of sodium is very high. So an innovative technology to control the reactivity is desired. The purpose of this study is to reduce the chemical reactivity of liquid sodium by dispersing the nanometer-size metallic particles into liquid sodium. Sub-themes of this study are nanoparticles production, evaluation of reaction control of liquid sodium, and feasibility study to FBR. In this paper, we describe the research program of them.
Saito, Junichi; Ara, Kuniaki; Sugiyama, Kenichiro*; Kitagawa, Hiroshi*; Yamauchi, Miho*; Yamashita, Akihiro*; Oka, Nobuki*; Yoshioka, Naoki*
no journal, ,
no abstracts in English
Saito, Junichi; Ara, Kuniaki; Nagai, Keiichi; Nishimura, Masahiro; Onojima, Takamitsu; Sugiyama, Kenichiro*; Zhang, Z.*; Kitagawa, Hiroshi*; Nakano, Haruyuki*; Oka, Nobuki*; et al.
no journal, ,
no abstracts in English
Saito, Junichi; Ara, Kuniaki; Ogata, Kan*; Fukunaga, Koichi*; Oka, Nobuki*; Kitagawa, Hiroshi*; Yamauchi, Miho*
no journal, ,
no abstracts in English
Saito, Junichi; Ara, Kuniaki; Fukunaga, Koichi*; Ogata, Kan*; Nagai, Masahiko*; Oka, Nobuki*; Kitagawa, Hiroshi*; Yamauchi, Miho*
no journal, ,
no abstracts in English
Saito, Junichi; Ara, Kuniaki; Nagai, Masahiko*; Fukunaga, Koichi*; Kitagawa, Hiroshi*; Yamauchi, Miho*; Oka, Nobuki*
no journal, ,
no abstracts in English
Saito, Junichi; Ara, Kuniaki; Fukunaga, Koichi*; Oka, Nobuki*; Nagai, Masahiko*
no journal, ,
no abstracts in English
Saito, Junichi; Fukunaga, Koichi*; Oka, Nobuki*; Nagai, Masahiko*; Ara, Kuniaki
no journal, ,
no abstracts in English
Kato, Atsushi; Nagai, Keiichi; Oka, Nobuki*; Ide, Akihiro*; Tanaka, Masako*; Otani, Yuichi*
no journal, ,
JAEA, MFBR and MHI have been studying the dry cleaning system of residual sodium on core components with blowing argon gas. This reports the master planning of the glove box test and sodium loop test to investigate and demonstrate the dry cleaning performances.
Kato, Atsushi; Nagai, Keiichi; Oka, Nobuki*; Ide, Akihiro*; Otani, Yuichi*; Tanaka, Masako*
no journal, ,
JAEA, MFBR and MHI have been studying the dry cleaning system of residual sodium on core components with blowing argon gas. This reports the results of the glove box test to conduct for investigating the sodium test conditions of demonstration test by sodium loop.
荒 邦章; 大平 博昭
西 敏郎*; 戸田 幹雄*; 岡 伸樹*; 蔦谷 博之*; 黒目 和也*; 吉岡 直樹*
JP, 2004-178900 
Patent licensing information Patent publication (In Japanese)
【課題】各種産業に利用されている液状流体において、その構成物質が有する諸特性の内より増強したい特性とより抑制したい特性とを希望通りに増強もしくは抑制する技術を提供する。 【解決手段】液状流体に分散させるナノ粒子の表面に酸化膜が存在しない状態とすることによりナノ粒子の均一分散度を向上させ、それにより液状流体の諸特性の抑制もしくは増強を図る。炎色反応を有する物質を含む液状流体にナノ粒子を均一に分散させて前記流体の発光を高輝度化させ、該流体の所在を容易に確認する。
荒 邦章; 斉藤 淳一
佐藤 裕之*; 岡 伸樹*; 永井 正彦*; 福永 浩一*
JP, 2010-041415 Patent licensing information Patent publication (In Japanese)
【課題】アルカリ液体金属中にナノ粒子を分散させるに際して、ナノ粒子の凝集、沈降がなく、かつ、時間が経過しても安定的にナノ粒子の分散を維持するナノ粒子を分散したアルカリ液体金属を得る。 【解決手段】アルカリ液体金属にナノ粒子を分散させるナノ粒子分散アルカリ液体金属の製造方法であって、前記アルカリ液体金属にナノ粒子を物理的な作用によって攪拌する粗分散工程と、前記粗分散工程の後、前記アルカリ液体金属に超音波を照射してナノ粒子を分散させる分散工程と、を行なうことにより、アルカリ液体金属にナノ粒子を分散させたアルカリ液体金属を製造するものであり、アルカリ液体金属が、リチウム、ナトリウム、カリウム等であり、ナノ粒子は、チタン、バナジウム、クロム、鉄、コバルト、ニッケル、ならびに銅のいずれかよりなる。
