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Fujita, Shunya*; Abe, Yutaka*; Kaneko, Akiko*; Yuasa, Tomohisa*; Segawa, Tomoomi; Yamada, Yoshikazu; Kato, Yoshiyuki; Ishii, Katsunori
Proceedings of 26th International Conference on Nuclear Engineering (ICONE-26) (Internet), 8 Pages, 2018/07
Mixed uranium oxide and plutonium oxide powder is produced from uranyl nitrate and plutonium nitrate mixed solution by the microwave heating denitration method in the spent fuel reprocessing process. Since the microwave heating method is accompanied by a boiling phenomenon, it is necessary to fully grasp the operating conditions in order to avoid flashing and spilling in the mass production of denitrification technology for the future. In this research, it was confirmed that a potassium chloride aqueous solution as a simulant of uranyl nitrate aqueous solution with high dielectric loss cause loss of microwave at the solution surface as the dielectric loss increased with the increase of KCl concentration by experimental and electromagnetic field analysis, and revealed that the change in the heating condition affects the generation of flushing.
Karisma, A. D.*; Hamaba, Taishu*; Fukasawa, Tomonori*; Huang, A.-N.*; Segawa, Tomoomi; Fukui, Kunihiro*
Review of Scientific Instruments, 88(2), p.024101_1 - 024101_8, 2017/02
Times Cited Count：4 Percentile：21.22(Instruments & Instrumentation)Microwave heating direct denitration method is used in the nuclear fuel reprocessing process. In order to develop a single-mode-type microwave heating thermogravimetry apparatus which can perform detailed analysis of the characteristics of microwave heating, the temperature dependence of microwave absorption is verified. The temperature distribution, microwave absorption efficiency, and dielectric properties of a CuO pellet that was heated by the microwave irradiation were investigated. The temperature distribution in the CuO pellet due to one-way travel of the microwave in the apparatus was accurately reproduced by a three-dimensional numerical simulation of the electromagnetic field. The numerically determined temperature dependency of the CuO absorption efficiency was found to be in very good agreement with published data.
Ito, Masayuki*
Nihon Gomu Kyokai-Shi, 75(2), p.68 - 72, 2002/02
no abstracts in English
Ito, Masayuki; Okada, Sohei
Journal of Applied Polymer Science, 50, p.233 - 243, 1992/00
no abstracts in English
ray irradiated EPR*; *; *; *; *; Ito, Masayuki; Kawakami, Waichiro
EIM-90-117, 10 Pages, 1990/00
no abstracts in English
Ito, Masayuki; Okada, Sohei
Nihon Gomu Kyokai-Shi, 63(12), p.753 - 759, 1990/00
no abstracts in English
; ; ; ; ; Yoshida, Kenzo
EIM-82-109, p.9 - 18, 1982/00
no abstracts in English
Saito, Junichi; Asakura, Kazutomo*; Kiba, Kazumasa*; Takesue, Naohisa*
no journal, ,
no abstracts in English
Yamada, Masaaki*; Segawa, Tomoomi; Fukasawa, Tomonori*; Ishigami, Toru*; Fukui, Kunihiro*
no journal, ,
The microwave heating method is used in the reprocessing process of spent fuels. It is possible to improve the quality of raw powder by using microwave heating and an external heating source together. However, the use of external heating in a microwave irradiation field causes a problem of deterioration of equipment. Therefore, the hybrid heating using a carbon nanotube (CNT) -containing alumina composite material with a large relative permittivity as an external heating source has been studied. To clarify the effect of the CNT content on the dielectric properties, the microwave heating characteristics were measured and evaluated, and numerical simulation was carried out. From these results, the microwave heating characteristics can be controlled by adjusting the CNT content in the CNT-containing alumina composite material.
Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Yamada, Masaaki*; Tamaru, Ayaka*; Nagakawa, Genta*; Fukasawa, Tomonori*; Ishigami, Toru*; Fukui, Kunihiro*; Murakami, Hiroyuki*
no journal, ,
To compensate for heat dissipation through the vessel and reduced microwave absorption due to intermediate in the fabrication process of the metallic oxide powder by the microwave heating denitration method, alumina composite ceramic material containing CNT which has a high relative dielectric loss as the external heating source with self-heating by microwave heating. The CNT was observed by SEM of the CNT-containing alumina composite ceramic material to observe the CNT presence in the base material of alumina. The surface resistivities decreased significantly when the CNT content increased from 0.2 to 0.5 mass%, and there was not much of a significant difference when the CNT content increased from 0.5 to 1.0 mass%. These results are consistent with the results of the previous studies of the apparent dielectric loss that showed a trend toward an increase in the apparent dielectric loss as the CNT content increased from 0.2 to 0.5 mass% in the CNT-containing alumina composites.
