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Journal Articles

Research on vitrification technology to immobilize radioactive sludge generated from Fukushima Daiichi Power Plant; Enhanced glass medium

Amamoto, Ippei; Kobayashi, Hidekazu; Kitamura, Naoto*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*; Fukayama, Daigen*; Nagano, Yuichi*; Jantzen, T.*; Hack, K.*

Journal of Nuclear Science and Technology, 53(10), p.1467 - 1475, 2016/10

 Times Cited Count:1 Percentile:14.27(Nuclear Science & Technology)

The iron phosphate glass (IPG) medium is known to be a high-efficiency glass medium, therefore we try to evaluate its applicability to immobilize sludge bearing radioactive nuclides arising from treatment of contaminated water at the stricken Fukushima Daiichi Nuclear Power Plant. For this study, many physical and chemical properties of target materials are necessary to evaluate the behaviours of IPG medium and its waste forms. Inevitably, it will entail the need for many and varied types of experiments to be carried out under high temperature. It is therefore rational to apply appropriate theoretical analysis first so as to reduce the number of experimental run. For this reason, some necessary thermodynamic values for theoretical analysis were estimated by CALPHAD approach followed by making up the calculated phase diagrams. By comparison with experimental results, they were found to be reliable for evaluating the behaviours of IPG medium and its waste forms.

Journal Articles

Transmission secondary ion mass spectrometry using 5 MeV C$$_{60}$$$$^{+}$$ ions

Nakajima, Kaoru*; Nagano, Kengo*; Suzuki, Motofumi*; Narumi, Kazumasa; Saito, Yuichi; Hirata, Koichi*; Kimura, Kenji*

Applied Physics Letters, 104(11), p.114103_1 - 114103_4, 2014/03

 Times Cited Count:5 Percentile:26.55(Physics, Applied)

Journal Articles

Development of a methodology to evaluate characteristics of energy technology by conjoint analysis

Hiwatari, Ryoji*; Okano, Kunihiko*; Asaoka, Yoshiyuki*; Nagano, Koji*; Ogawa, Yuichi*; Kato, Takaaki*; Tobita, Kenji; Norimatsu, Takayoshi*

Denryoku Chuo Kenkyusho Hokoku (L07012), P. 34, 2008/07

Key to take public acceptance into account on the energy system is how to evaluate and compare quantitatively the merits and the demerits of each energy system from the public viewpoint. For this purpose, a method to evaluate the property of energy technology is developed based on the conjoint analysis technique. Based on the statistical method, utility values for energy abundance, environmental load (i.e. CO$$_{2}$$ emission), stability of supply, sense of security, and other features as well as economic performance, are estimated from several thousands of choice experiments to more than 1600 respondents volunteered in the study. The basic methodology developed in this study establishes the first step to assess energy technology quantitatively on a common standard, and needs further integration with other factors, such as waste generation other than CO$$_{2}$$ emission.

Oral presentation

Forward emission of secondary ions from phenylalanine films on SiN membranes penetrated by MeV Cu$$^{4+}$$ and C$$_{60}$$$$^{+}$$ from the backside

Nagano, Kengo*; Nakajima, Kaoru*; Suzuki, Motofumi*; Kimura, Kenji*; Narumi, Kazumasa; Saito, Yuichi

no journal, , 

no abstracts in English

Oral presentation

Fast-C$$_{60}$$$$^{+}$$-ion-transimission-induced secondary-ion forward emissions from amino acids on SiN thin films

Nagano, Kengo*; Nakajima, Kaoru*; Suzuki, Motofumi*; Kimura, Kenji*; Narumi, Kazumasa; Saito, Yuichi

no journal, , 

no abstracts in English

Oral presentation

Thermodynamic approach for iron phosphate glass as a waste medium

Amamoto, Ippei; Kobayashi, Hidekazu; Yamashita, Teruo; Nagai, Takayuki; Kitamura, Naoto*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*; Fukayama, Daigen*; Nagano, Yuichi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Forward emission of secondary ions from phenylalanine films on SiN membrane penetrated by swift C$$_{60}$$$$^{+}$$ from the backside

Nagano, Kengo*; Nakajima, Kaoru*; Suzuki, Motofumi*; Kimura, Kenji*; Narumi, Kazumasa; Saito, Yuichi

no journal, , 

no abstracts in English

Oral presentation

Transmission secondary ion mass spectrometry of phenylalanine on silicon nitride membranes using MeV monoatomic and cluster ions

Nakajima, Kaoru*; Nagano, Kengo*; Suzuki, Motofumi*; Narumi, Kazumasa; Saito, Yuichi; Hirata, Koichi*; Kimura, Kenji*

no journal, , 

Oral presentation

Forward emission of secondary ions from phenylalanine films on SiN membranes penetrated by swift C$$_{60}$$$$^{+}$$ from the SiN side, 2

Nakajima, Kaoru*; Marumo, Tomoya*; Nagano, Kengo*; Kimura, Kenji*; Narumi, Kazumasa; Saito, Yuichi

no journal, , 

no abstracts in English

Oral presentation

Transmission secondary ions mass spectrometry of an amino acid using 5 MeV C$$_{60}$$ ions

Nakajima, Kaoru*; Nagano, Kengo*; Suzuki, Motofumi*; Narumi, Kazumasa; Saito, Yuichi; Hirata, Koichi*; Kimura, Kenji*

no journal, , 

no abstracts in English

Oral presentation

Construction of Glass Database, 1; Acquisition of required thermodynamic properties for the construction of computational phase diagrams of vitrified wastes

Amamoto, Ippei; Oyama, Koichi; Nagano, Yuichi*; Jantzen, T.*; Hack, K.*; Fukayama, Daigen*

no journal, , 

As the vitrified study of the high-level radioactive waste is usually carried out under the high-temperature circumstance, it spends a lot of time and effort. The actual experiments and/or measurement, therefore, should be undertaken rationally after ascertaining the behaviors of target materials by the theoretical calculation, if possible. From such point of view, the construction of phase diagrams is considered after obtaining necessary thermodynamic properties from existing phase diagrams by CALPHAD method and/or published data. In this paper, several phase diagrams are presented such as the borosilicate glass which is currently used as the vitrified medium for the HLW, the iron-phosphate glass which will be potential vitrified medium for various wastes. Some phase diagrams are also prepared for the vitrified wastes which was loaded fission products such as molybdenum, palladium, etc..

Oral presentation

Basic research programs of vitrification technology for waste volume reduction, 58; Construction of thermodynamic database of Ru-Rh-Pd-SiO$$_{2}$$-B$$_{2}$$O$$_{3}$$-Na$$_{2}$$O-Li$$_{2}$$O system

Amamoto, Ippei; Oyama, Koichi; Fukayama, Daigen*; Nagano, Yuichi*; Hack, K.*; Jantzen, T.*

no journal, , 

The thermodynamic data of glass medium and FP, essential for estimation of the technical development of HLW as vitrified waste, is obtained by the CALPHAD method. As Ru-Rh-Pd-SiO$$_{2}$$-B$$_{2}$$O$$_{3}$$-Na$$_{2}$$O-Li$$_{2}$$O system could be constructed this time, it became possible to construct the phase diagram and/or estimation of FP loading amount under various conditions.

Oral presentation

Basic research programs of vitrification technology for waste volume reduction, 65; Construction of MATRIX Database

Amamoto, Ippei; Oyama, Koichi; Nagano, Yuichi*; Nagao, Saichi*; Kitajima, Hideki*; Taneda, Naoki*; Maruyama, Tsutomu*; Sakai, Mitsuyoshi*; Nishikawa, Nobutaka*

no journal, , 

MATRIX database has been constructed to obtain experimental phase diagram using Interglad. It also possesses functions such as literature search, construction of computational phase diagrams by the thermodynamic method using FactSage as well as estimation of viscosity, density and/or electric resistance of certain glasses by neural network method.

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