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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.
