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JAEA Reports

Development of technology to simultaneously measure viscosity and surface tension of molten materials in reactor core (Contract research); FY2020 Nuclear Energy Science & Technology and Human Resource Development Project

Collaborative Laboratories for Advanced Decommissioning Science; Osaka University*

JAEA-Review 2021-046, 77 Pages, 2022/01

JAEA-Review-2021-046.pdf:2.92MB

The Collaborative Laboratories for Advanced Decommissioning Science (CLADS), Japan Atomic Energy Agency (JAEA), had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project (hereafter referred to "the Project") in FY2020. The Project aims to contribute to solving problems in the nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. (TEPCO). For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2018, this report summarizes the research results of the "Development of technology to simultaneously measure viscosity and surface tension of molten materials in reactor core" conducted from FY2018 to FY2020. Since the final year of this proposal was FY2020, the results for three fiscal years were summarized. Since (U, Zr)O $_{2}$ and boride, molten materials in reactor core, exist at extremely high temperature, chemical reactions between the vessel and these molten materials are unavoidable. Therefore, it is difficult to measure the thermophysical property of these materials. In the present study, droplets are produced by heating and melting the samples levitated by a gas levitation method, then the droplets are collided with a substrate.

JAEA Reports

Development of technology to simultaneously measure viscosity and surface tension of molten materials in reactor core (Contract research); FY2019 Nuclear Energy Science & Technology and Human Resource Development Project

Collaborative Laboratories for Advanced Decommissioning Science; Osaka University*

JAEA-Review 2020-038, 41 Pages, 2020/12

JAEA-Review-2020-038.pdf:3.28MB

JAEA/CLADS had been conducting the Nuclear Energy Science & Technology and Human Resource Development Project in FY2019. Among the adopted proposals in FY2018, this report summarizes the research results of the "Development of Technology to Simultaneously Measure Viscosity and Surface Tension of Molten Materials in Reactor Core" conducted in FY2019.

JAEA Reports

Development of technology to simultaneously measure viscosity and surface tension of molten materials in reactor core (Contract research); FY2018 Center of World Intelligence Project for Nuclear Science/Technology and Human Resource Development

Collaborative Laboratories for Advanced Decommissioning Science; Osaka University*

JAEA-Review 2019-025, 36 Pages, 2020/01

JAEA-Review-2019-025.pdf:2.57MB

CLADS, JAEA, had been conducting the Center of World Intelligence Project for Nuclear Science/Technology and Human Resource Development (hereafter referred to "the Project") in FY2018. The Project aims to contribute to solving problems in nuclear energy field represented by the decommissioning of the Fukushima Daiichi Nuclear Power Station, Tokyo Electric Power Company Holdings, Inc. For this purpose, intelligence was collected from all over the world, and basic research and human resource development were promoted by closely integrating/collaborating knowledge and experiences in various fields beyond the barrier of conventional organizations and research fields. The sponsor of the Project was moved from the Ministry of Education, Culture, Sports, Science and Technology to JAEA since the newly adopted proposals in FY2018. On this occasion, JAEA constructed a new research system where JAEA-academia collaboration is reinforced and medium-to-long term research/development and human resource development contributing to the decommissioning are stably and consecutively implemented. Among the adopted proposals in FY2018, this report summarizes the research results of the "Development of Technology to Simultaneously Measure Viscosity and Surface Tension of Molten Materials in Reactor Core". Since (U,Zr)O $_{2}$ and boride, molten materials in reactor core, exist at extremely high temperature, chemical reactions between the vessel and these molten materials are unavoidable. Therefore, it is difficult to measure the thermophysical property of these materials. In the present study, droplets are produced by heating and melting the samples levitated by a gas levitation method, then the droplets are collided with a substrate. From the instant behavior of the collision, a new technology to simultaneously derive the viscosity and surface tension will be developed.

Journal Articles

Structure change of monoclinic ZrO $_{2}$ baddeleyite involving softenings of bulk modulus and atom vibrations

Fukui, Hiroshi*; Fujimoto, Manato*; Akahama, Yuichi*; Sano, Asami; Hattori, Takanori

Acta Crystallographica Section B; Structural Science, Crystal Engineering and Materials (Internet), 75(4), p.742 - 749, 2019/08

https://doi.org/10.1107/S2052520619007923

Times Cited Count：9 Percentile：63.29(Chemistry, Multidisciplinary)

Monoclinic ZrO $_{2}$ baddeleyite exhibits anomalous softenings of bulk modulus and atom vibrations with compression. We have investigated the pressure evolution of the structure by neutron powder diffraction combined with ab-initio calculations. The present results showed that the anomalous pressure response of the bulk modulus is related not to the change in the bonding characters but to the deformation of an oxygen sublattice, especially one of layers made of oxygens in the crystallographic * plane. The layer consists of two parallelograms; one is rotating with little distortion and the other is being distorted with increasing pressure. This deformation of this layer makes one of Zr-O distances long, resulting in the softening of some atom vibrational modes.

Journal Articles

A Thermodynamic model for ZrO $_{2}$ (am) solubility at 25 $^{circ}$ C in the Ca $^{2+}$ -Na $^{+}$ -H $^{+}$ -Cl $^{-}$ -OH $^{-}$ -H $_{2}$ O system; A Critical review

Rai, D.*; Kitamura, Akira; Altmaier, M.*; Rosso, K. M.*; Sasaki, Takayuki*; Kobayashi, Taishi*

Journal of Solution Chemistry, 47(5), p.855 - 891, 2018/05

https://doi.org/10.1007/s10953-018-0766-4

Times Cited Count：9 Percentile：9.27(Chemistry, Physical)

We have critically reviewed experimental data for Zr hydrolysis constant values for formation of several mononuclear and polynuclear species and a solubility product value for ZrO $_{2}$ (am). We have determined new/revised values for the formation constants of Zr(OH) $_{2}$ $^{2+}$ , Zr(OH) $_{4}$ (aq), Zr(OH) $_{5}$ $^{-}$ , Zr(OH) $_{6}$ $^{2-}$ and Ca $_{3}$ Zr(OH) $_{6}$ $^{4+}$ , and the solubility product for ZrO $_{2}$ (am) after the critical review.

Journal Articles

Evaluation of oxidation efficiency of hydrophobic palladium catalyst for $^{14}$ C monitoring in gaseous radioactive waste

Ueno, Yumi; Nakagawa, Masahiro; Sato, Junya; Iwai, Yasunori

Hoken Butsuri, 51(1), p.7 - 11, 2016/03

https://doi.org/10.5453/jhps.51.7

In the Nuclear Science Research Institute, Japan Atomic Energy Agency (JAEA), in order to oxidize $^{14}$ C, which exists in various chemical forms in exhaust, into $^{14}$ CO $_{2}$ , a copper oxide (CuO) catalyst is introduced after heating to 600 $^{circ}$ C. Our goal was to establish a safer $^{14}$ C monitoring system by lowering the heating temperature required for the catalyst; therefore, we developed a new hydrophobic palladium/silicon dioxide (Pd/SiO $_{2}$ ) catalyst that makes the carrier's surface hydrophobic. In these experiments, catalysts CuO, platinum/aluminum oxide (Pt/Al $_{2}$ O $_{3}$ ), palladium/zirconium dioxide (Pd/ZrO $_{2}$ ), hydrophobic Pd/SiO $_{2}$ , and hydrophilic Pd/SiO $_{2}$ were ventilated with standard methane gas, and we compared the oxidation efficiency of each catalyst at different temperatures. As a result, we determined that the hydrophobic Pd/SiO $_{2}$ catalyst had the best oxidation efficiency. By substituting the currently used CuO catalyst with the hydrophobic Pd/SiO $_{2}$ catalyst, we will be able to lower the working temperature from 600 $^{circ}$ C to 300 $^{circ}$ C and improve the safety of the monitoring process.

Journal Articles

Formation of non FP plate-out High density and homegeneity ceramic thin coating onto the surface of high strength Ni-based super alloy by ion plating technique

Ishiyama, Shintaro

Nihon Kinzoku Gakkai-Shi, 68(6), p.353 - 361, 2004/06

https://doi.org/10.2320/jinstmet.68.353

Times Cited Count：0 Percentile：0.01(Metallurgy & Metallurgical Engineering)

Al $_{2}$ O $_{3}$ and ZrO $_{2}$ coating test was performed on the surface of Ni based super alloy by ion plateing technique and high density and homegeneity ceramic thin coating with the thichkness of 4m was formed on the specimen surface. 1173K-RT heat cycle and FP plat-out tests were performed with these coate specimens and no damage was found under 100 cycles and there is no plate-out onto the these specimens.

Journal Articles

Correlation of crystal structures with electric field gradients in the fluorite- and pyrochlore-type compounds in the Gd $_{2}$ O $_{3}$ -ZrO $_{2}$ system

Wang, J.*; Otobe, Haruyoshi; Nakamura, Akio; Takeda, Masuo*

Journal of Solid State Chemistry, 176(1), p.105 - 110, 2003/11

https://doi.org/10.1016/S0022-4596(03)00353-0

Times Cited Count：14 Percentile：44.24(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Structural properties of the fluorite- and pyrochlore-type compounds in the Gd $_{2}$ O $_{3}$ -ZrO $_{2}$ system xGdO $_{1.5}$ -(1-x)ZrO $_{2}$ with 0.18 x 0.62

Wang, J.*; Nakamura, Akio; Takeda, Masuo*

Solid State Ionics, 164(3-4), p.185 - 191, 2003/11

https://doi.org/10.1016/j.ssi.2003.09.003

Times Cited Count：34 Percentile：79.27(Chemistry, Physical)

no abstracts in English

Journal Articles

Irradiation effects on yttria-stabilized Zirconia irradiated with neon ions

Hojo, Tomohiro; Aihara, Jun; Hojo, Kiichi; Furuno, Shigemi*; Yamamoto, Hiroyuki; Nitani, Noriko; Yamashita, Toshiyuki; Minato, Kazuo; Sakuma, Takaaki*

Journal of Nuclear Materials, 319, p.81 - 86, 2003/06

https://doi.org/10.1016/S0022-3115(03)00137-5

Times Cited Count：18 Percentile：74.33(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Radiation effects on yttria-stabilized ZrO $_{2}$ single crystals with helium and Xenon ions at RT and 923K

Hojo, Kiichi; Hojo, Tomohiro; Sasajima, Naohiko*; Shirasu, Noriko; Yamashita, Toshiyuki; Minato, Kazuo; Furuno, Shigemi*

AIP Conference Proceedings 680, p.647 - 652, 2003/00

https://doi.org/10.1063/1.1619799

no abstracts in English

Journal Articles

Phase relations between a fluorite and a pyrochlore structure in the system of actinides and zirconium oxides

Yamashita, Toshiyuki; Kuramoto, Kenichi; Nakada, Masami; Yamazaki, Satoshi*; Sato, Tsuyoshi*; Matsui, Tsuneo*

Journal of Nuclear Science and Technology, 39(Suppl.3), p.585 - 591, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875536

no abstracts in English

Journal Articles

Studies in the PuO $_{2}$ -ZrO $_{2}$ pseudo-binary phase diagram

Albiol, T.*; Serizawa, Hiroyuki; Arai, Yasuo

Journal of Nuclear Science and Technology, 39(Suppl.3), p.834 - 837, 2002/11

http://www.tandfonline.com/doi/abs/10.1080/00223131.2002.10875598

no abstracts in English

Journal Articles

Effective thermal conductivity measurement of the candidate ceramic breeder pebble beds by the hot wire method

Enoeda, Mikio; Ohara, Yoshihiro; Roux, N.*; Ying, A.*; Pizza, J.*; Malang, J.*

Fusion Technology, 39(No.2 Part.2), p.612 - 616, 2001/03

no abstracts in English

Journal Articles

Re-evaluation of the phase relationship between plutonium and zirconium dioxides

Serizawa, Hiroyuki; Nakajima, Kunihisa; Arai, Yasuo; Yamashita, Toshiyuki; Kuramoto, Kenichi; Kinoshita, H.*; Yamanaka, Shinsuke*; Uno, Masayoshi*; Kurosaki, K.*

Progress in Nuclear Energy, 38(3-4), p.237 - 240, 2001/02

https://doi.org/10.1016/S0149-1970(00)00107-4

Times Cited Count：5 Percentile：38.96(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Benchmark experiment on LiAlO $_{2}$ , Li $_{2}$ TiO $_{3}$ and Li $_{2}$ ZrO $_{3}$ assemblies with D-T neutrons; Leakage neutron spectrum measurement

Murata, Isao*; Nishio, T.*; Kokooo*; Kondo, T.*; Takagi, H.*; Nakano, D.*; Takahashi, Akito*; Maekawa, Fujio; Ikeda, Yujiro; Takeuchi, Hiroshi

Fusion Engineering and Design, 51-52(Part.B), p.821 - 827, 2000/11

https://doi.org/10.1016/S0920-3796(00)00200-3

Times Cited Count：9 Percentile：50.61(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Performance tests of a melting system for miscellaneous solid wastes and corrosion tests of a long-life refractory material (Contract research)

Isobe, Motoyasu; Kameo, Yutaka; Nakashio, Nobuyuki; Wakui, Takuji*; Iwata, Keiji*; Kibayashi, Tatsuyuki*; Kanazawa, Katsuo; Nakashima, Mikio; Hirabayashi, Takakuni*

JAERI-Tech 2000-049, 29 Pages, 2000/09

JAERI-Tech-2000-049.pdf:2.87MB

no abstracts in English

JAEA Reports