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JAEA Reports

XAFS measurement of simulated waste borosilicate glass samples (Joint research)

Nagai, Takayuki; Kobayashi, Hidekazu; Sasage, Kenichi; Ayame, Yasuo; Okamoto, Yoshihiro; Shiwaku, Hideaki; Yamanaka, Keisuke*; Ota, Toshiaki*

JAEA-Research 2017-005, 54 Pages, 2017/06

JAEA-Research-2017-005.pdf:16.17MB

Addition of radioactive waste to a borosilicate frit affects the local structures of boron (B) and waste elements in a waste glass. Synchrotron XAFS measurement was applied to investigate the local structural changes by using simulated waste borosilicate glass samples. Following results were obtained by the B K-edge XAFS analysis. It was confirmed that B K-edge XAFS analysis enables us to discriminate sp $^{2}$ type boron (BO $_{3}$ ) from sp $^{3}$ type boron (BO $_{4}$ ). Addition of waste elements to a glass frit increases the percentage of BO $_{3}$ and decreases that of BO $_{4}$ . By decreasing the SiO $_{2}$ /Al $_{2}$ O $_{3}$ ratio or increasing the (SiO $_{2}$ +B $_{2}$ O $_{3}$ )/Al $_{2}$ O $_{3}$ ratio in the glass composition, the BO $_{3}$ percentage increases and the BO $_{4}$ percentage decreases. Addition of P $_{2}$ O $_{5}$ decreases the BO $_{3}$ percentage and increases the BO $_{4}$ percentage. Following results were obtained from XAFS measurement of the waste elements. Cerium (Ce) valence is more reduced with the increase of the B $_{2}$ O $_{3}$ content. Addition of P $_{2}$ O $_{5}$ has a tendency to reduce the Ce valence and to enhance deposition of Zr oxide. Deposition of ruthenium compounds separated from glass phase can not be improved by changing the B $_{2}$ O $_{3}$ content. This study was performed as a part of the project, "Improvement of vitrification process of high-level radioactive liquid wastes" on the foundation business of the Agency for Natural Resources and Energy.

JAEA Reports

XAFS measurement of simulated waste glass samples (Borosilicate glass including vanadium)

Nagai, Takayuki; Kobayashi, Hidekazu; Sasage, Kenichi; Ayame, Yasuo; Okamoto, Yoshihiro; Shiwaku, Hideaki; Matsuura, Haruaki*; Uchiyama, Takafumi*; Okada, Yukiko*; Nezu, Atsushi*; et al.

JAEA-Research 2016-015, 52 Pages, 2016/11

JAEA-Research-2016-015.pdf:37.48MB

The local structure of waste elements in simulated waste glasses including V was estimated by using synchrotron XAFS measurement in this study. The results are as follows. (1) V has a high possibility which exists in the glass phase in the case of frit, and V can regard both samples as stable 4 coordination structure. (2) Zn, Ce, Nd, Zr, and Mo exist in the glass phase, and the difference is admitted by the percentage of Ce(III) and Ce(IV) by the composition. (3) Ru is separated from the glass phase as RuO $_{2}$ crystalline, both of metal and oxide exist in Rh, and Pd is separated out as metal. (4) It was confirmed that the regularity of the local structure of Zr and Mo in the molten glasses retreats as a result of the XAFS measurement at high temperature. (5) The XAFS measurement of molten glasses were performed at 1200 $^{circ}$ C, so it would be possible to acquire excellent data by improving the shapes of the sample cell.

JAEA Reports

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Ouchi, Jin; Ayame, Yasuo; Terada, Akihiko; Masaki, Toshio; Kobayashi, Hiroaki; Igarashi, Hiroshi

PNC TN8410 94-219, 473 Pages, 1994/06

PNC-TN8410-94-219.pdf:8.56MB

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Journal Articles

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Igarashi, Hiroshi; Ayame, Yasuo; Ouchi, Jin

Proceedings of 1993 International High-Level Radioactive Waste Management Conference, ,

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Oral presentation

Feasibility study on volume reduction technology of HLLW vitrification

Kobayashi, Hidekazu; Sasage, Kenichi; Usui, Yasufumi; Ayame, Yasuo; Shiotsuki, Masao

no journal, ,

no abstracts in English

Oral presentation

Generation process of yellow phase from borosilicate glass matrix

Miura, Akihiko; Kobayashi, Hidekazu; Ayame, Yasuo; Shiotsuki, Masao; Weisenburger, S.*; Roth, G.*

no journal, ,

no abstracts in English

Oral presentation

Applicability of vitrification to the secondary waste produced by treatment of the contaminated water; Study on vitrification to the spent zeolite

Kobayashi, Hidekazu; Yokozawa, Takuma; Yamashita, Teruo; Nagai, Takayuki; Amamoto, Ippei; Ayame, Yasuo

no journal, ,

no abstracts in English

Oral presentation

Oyama, Koichi; Matsumura, Tadayuki; Harashima, Takero; Yamashita, Teruo; Ayame, Yasuo; Kodaka, Akira

no journal, ,

no abstracts in English

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XAFS measurement of simulated waste borosilicate glass samples (Joint research)

XAFS measurement of simulated waste glass samples (Borosilicate glass including vanadium)

None

None

Feasibility study on volume reduction technology of HLLW vitrification

Generation process of yellow phase from borosilicate glass matrix

Applicability of vitrification to the secondary waste produced by treatment of the contaminated water; Study on vitrification to the spent zeolite

Development of Vitrification Technology at JAEA

Investigation of glass structure and cesium redox state in simulated waste glass by Raman spectroscopy and synchrotron XAFS measurement

Influence of chemical composition on cerium valence in simulated vitrified waste glasses

Development on the inorganic porous materials to sorb platinoid elements

Development of recovery process of platinum-group metals from HLLW for stable production and volume reduction of homogeneous vitrified object, 3; Synthesis of ceramics support materials and their sorption characteristics

Lagrange simulation of TVF2 glass melter with forming of thick noble metal sediment

Elucidation for thermal decomposition behaviour of the high-level radioactive liquid waste; Effect on the thermal decomposition reaction of lanthanoid/alkali metal nitrates caused by ruthenium

Simulation of TVF glass melter operation with forming of thick sediments composed of platinum group elements

Development of recovery process of platinum-group metals from HLLW for stable production and volume reduction of homogeneous vitrified object, 8; Synthesis of ceramics support materials using some of the third period elements (Al and Si) and their sorption characteristics

Study on vitrification plan of high level liquid waste in the TVF, 1; Approachs for reduction of potential hazard

Study on vitrification plan of high level liquid waste in the TVF, 4; Evaluation of forms and application techniques for the next glass melter

Study on vitrification plan of high level liquid waste in the TVF, 2; Operation results and evaluation of the current TVF glass melter

Study on vitrification plan of high level liquid waste in the TVF, 3; Configuat of request functions and task for the next glass melter