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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

Containment of radioactive waste to glass; "Iron phasphate glass" for radioactive waste treatment

Tsuzuki, Tatsuya*; Mitamura, Naoki*; Amamoto, Ippei

Shakai, Kankyo Hokokusho 2014 (Internet), p.6 - 7, 2014/10

no abstracts in English

Journal Articles

Applicability of iron phosphate glass medium for loading NaCl originated from seawater used for cooling the stricken power reactors

Kobayashi, Hidekazu; Amamoto, Ippei; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Kitamura, Naoto*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*

Proceedings of 15th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2013) (CD-ROM), 6 Pages, 2013/09

no abstracts in English

Journal Articles

Behaviour of IPG waste forms bearing BaSO$$_{4}$$ as the dominant sludge constituent generated from the treatment of water used for cooling the stricken power reactors

Amamoto, Ippei; Kobayashi, Hidekazu; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Kitamura, Naoto*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*

Proceedings of 15th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2013) (CD-ROM), 8 Pages, 2013/09

The great amount of water used for cooling the stricken power reactors at Fukushima Dai-ichi has resulted in accumulation of "remaining water". As the remaining water is subsequently contaminated by FPs, etc., it is necessary to decontaminate it in order to reduce the volume of liquid radioactive waste and to reuse it again for cooling the reactors. Various techniques are being applied to remove FP, etc. and to make stable waste forms. One of the methods using the iron phosphate glass as a medium is being developed to stabilize the strontium-bearing sludge whose main component is BaSO$$_{4}$$. From the results hitherto, the iron phosphate glass is regarded as a potential medium for the target sludge.

Journal Articles

New loading glass for radioactive waste; Enhancement of its performance

Tsuzuki, Tatsuya*; Mitamura, Naoki*; Amamoto, Ippei

Mirai Zairyo, 12(10), p.43 - 47, 2012/10

no abstracts in English

Journal Articles

Development of iron phosphate glass with Cs sorption function; Study on suitable chemical composition for glass filter and its sorption mechanism

Mitamura, Naoki*; Tsuzuki, Tatsuya*; Amamoto, Ippei

Nihon Genshiryoku Gakkai Wabun Rombunshi, 9(4), p.396 - 404, 2010/12

Iron phosphate glass could be used to immobilize the high-level radioactive waste (HLW) and has the possibility to function as a Cs sorpant. However, the glass must endure high temperature from about 350$$^{circ}$$C, the melting point of LiCl-KCl electrolyte, to 600$$^{circ}$$C, the operational maximum temperature. In this study, we have successfully developed the iron phosphate glasses functioning as Cs sorpant, possessing heat resistance, etc.. To prevent the glass softening at temperature around 600$$^{circ}$$C, alkali metal oxides, alkaline-earth metal oxides, alumina and/or titania were added into the Fe$$_{2}$$O$$_{3}$$-P$$_{2}$$O$$_{5}$$ glass. Through soak experiments of the glasses in molten salt($$^{3}$$LiCl-KCl)containing CsCl, it was found that those glasses immobilize Cs by reacting with CsCl and formed crystal phase of CsFeCl$$_{3}$$ and/or Cs$$_{3}$$FeCl$$_{3}$$. This Cs sorption function is peculiar to the developed iron phosphate glasses.

Journal Articles

Removal of fission products in the spent electrolyte using iron phosphate glass as a sorbent

Amamoto, Ippei; Mitamura, Naoki*; Tsuzuki, Tatsuya*; Takasaki, Yasushi*; Shibayama, Atsushi*; Yano, Tetsuji*; Nakada, Masami; Okamoto, Yoshihiro

Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM), p.503 - 508, 2010/10

The main objective of this development is to recycle the purified eutectic medium of the pyroreprocessing, delaying its disposal for as long as possible. We have introduced the simple filtration method to remove the rare earth element (REE) particles which were formed due to the conversion of REE chlorides to phosphates. Here, the iron phosphate glass is used as a filtration medium for the removal of FP particles. However, some soluble FP such as compounds of alkali-metals, alkaline-earth metals, etc. still remain in the eutectic medium. This time around, on an experimental basis, the iron phosphate glass has been used as a sorbent instead, to remove the soluble FP. We have obtained some positive results and have intention to incorporate it into the spent electrolyte recycle process as a part of the FP separation and immobilization system.

Journal Articles

Separation of lanthanoid phoshates from the spent electrolyte of pyroprocessing

Amamoto, Ippei; Kofuji, Hirohide; Myochin, Munetaka; Tsuzuki, Tatsuya*; Takasaki, Yasushi*; Yano, Tetsuji*; Terai, Takayuki*

Proceedings of 12th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM '09/DECOM '09) (CD-ROM), 9 Pages, 2009/10

This study is carried out to make the pyroprocessing hold a competitive advantage. As one of the measures is to reduce the volume of HLW, the phosphate conversion method is applied for removal of FP from the spent electrolyte in this paper. Though the removing target elements in the electrolyte are alkali metals, alkaline earth metals and lanthanoid elements, only lanthanoid elements and lithium form the insoluble phosphates by reaction with Li$$_{3}$$PO$$_{4}$$. Therefore, as the first step, the precipitation experiment was carried out to observe the behaviours of elements which form the insoluble precipitates. Then the filtration was experimented to remove precipitates in the spent electrolyte using Fe$$_{2}$$O$$_{3}$$-P$$_{2}$$O$$_{5}$$ glass system as a filtlation medium which is compatible material with the glassification. The result of separation of precipitates by filtration was effective and attained almost 100$$%$$.

Oral presentation

Fundamental study on electrolyte recycle process by phosphate conversion technique, 8; Development of FP compounds recovery method from eutectic medium

Amamoto, Ippei; Kofuji, Hirohide; Myochin, Munetaka; Tsuzuki, Tatsuya*; Mitamura, Naoki*; Takasaki, Yasushi*; Yano, Tetsuji*; Terai, Takayuki*

no journal, , 

no abstracts in English

Oral presentation

Development of iron phosphate glass as new separation material of fission products in melts

Mitamura, Naoki*; Amamoto, Ippei; Myochin, Munetaka; Tsuzuki, Tatsuya*

no journal, , 

no abstracts in English

Oral presentation

Fundamental study on electrolyte recycle process by phosphate conversion technique, 9; Study on sorption mechanism of iron phosphate-glass as sorbent

Amamoto, Ippei; Kofuji, Hirohide; Tsuzuki, Tatsuya*; Mitamura, Naoki*; Takasaki, Yasushi*; Shibayama, Atsushi*; Yano, Tetsuji*; Terai, Takayuki*

no journal, , 

no abstracts in English

Oral presentation

Fundamental study on electrolyte recycle process by phosphate conversion technique, 12; Study on stable iron-phosphate glass system for use as a sorbent in molten salt

Amamoto, Ippei; Kofuji, Hirohide; Mitamura, Naoki*; Tsuzuki, Tatsuya*; Motohashi, Takumi*; Takasaki, Yasushi*; Shibayama, Atsushi*; Yano, Tetsuji*

no journal, , 

no abstracts in English

Oral presentation

Fundamental study on immobilization of sludge generated from treatment of remaining water used for cooling of the stricken power reactors

Amamoto, Ippei; Kobayashi, Hidekazu; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Suzuki, Yoshikazu*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*

no journal, , 

The great amount of water used for cooling the stricken reactors at Fukushima Dai-ichi Nuclear Power Plant following the earthquake and tsunami of 11 March 2011 had resulted in accumulation of "remaining water" in some buildings. From public announcements, it seems likely the decontamination process of La Hague reprocessing plant would be employed as one of the treatment processes for the remaining water contaminated by FPs such as Cs, Sr, etc.. Based on literature study, Cs would precipitate with ferrocyanide compound as well as Sr with BaSO$$_{4}$$ by applying the above-mentioned process. In this study, BaSO$$_{4}$$ as the simulated sludge was loaded into the iron phosphate glass (IPG) medium under different melting temperature. Based on the results, the performance of IPG containing BaO (decomposed from BaSO$$_{4}$$) improved with increase loading of BaO up to 48 mol% at lower melting temperature.

Oral presentation

Applicability of vitrification method for waste generated from treatment of contaminated water, 3; Preliminary experiment on vitrification of the sludge

Amamoto, Ippei; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Nakamura, Hirotaka*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*; Kobayashi, Hidekazu

no journal, , 

no abstracts in English

Oral presentation

Applicability of vitrification method for waste generated from treatment of contaminated water, 2; Outline of sludge vitrification and selection of glass medium

Amamoto, Ippei; Kobayashi, Hidekazu; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Suzuki, Yoshikazu*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*

no journal, , 

no abstracts in English

Oral presentation

Applicability of vitrification method for waste generated from treatment of contaminated water, 5; Fundamental experiment on vitrification of NaCl by the IPG medium

Kobayashi, Hidekazu; Amamoto, Ippei; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Kitamura, Naoto*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*

no journal, , 

no abstracts in English

Oral presentation

Applicability of vitrification method for waste generated from treatment of contaminated water, 4; Fundamental experiment on vitrification of BaSO$$_{4}$$ by the IPG medium

Amamoto, Ippei; Kobayashi, Hidekazu; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Kitamura, Naoto*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*

no journal, , 

no abstracts in English

Oral presentation

Applicability of vitrification method for waste generated from treatment of contaminated water, 6; Fundamental experiment on vitrification of ferrocyanide constituent by the IPG medium

Kobayashi, Hidekazu; Amamoto, Ippei; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Kitamura, Naoto*; Takebe, Hiromichi*; Mitamura, Naoki*; Tsuzuki, Tatsuya*

no journal, , 

no abstracts in English

Oral presentation

Effect of additional Cs$$_{2}$$SO$$_{4}$$ on properties and structure of iron phosphate glasses

Kitamura, Naoto*; Takebe, Hiromichi*; Amamoto, Ippei; Kobayashi, Hidekazu; Tsuzuki, Tatsuya*

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

28 (Records 1-20 displayed on this page)