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JAEA Reports

Research and development on partitioning in JAERI; Review of the research activities until the development of 4-group partitioning process

Morita, Yasuji; Kubota, Masumitsu*

JAERI-Review 2005-041, 35 Pages, 2005/09

JAERI-Review-2005-041.pdf:2.24MB

Research and development on Partitioning in JAERI are reviewed in the present report from the beginning to the development of the 4-Group Partitioning Process and its test with real high-level liquid waste (HLLW). In the 3-Group Partitioning Process established in around 1980, elements in HLLW are separated into 3 groups of transuranium element group, Sr-Cs group and the other element group. The 4-Group Partitioning Process subsequently developed contains the separation of Tc-platinum group metals additionally. The process was tested to demonstrate its performance with real concentrated HLLW. Until then, various separation methods for various elements were studied and selection and optimization of the separation methods were carried out to establish the process. Review of the experience, findings and results is very important and valuable for future study on partitioning. The present report is prepared from this point of view.

Journal Articles

Preparation of acid deficient solutions of uranyl nitrate and thorium nitrate by steam denitration

; Takahashi, Yoshihisa

Journal of Nuclear Science and Technology, 33(2), p.147 - 151, 1996/02

 Times Cited Count:2 Percentile:24.15(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Effects of nitrite on denitration of nuclear fuel reprocessing waste with organic reductants

; ;

Journal of Nuclear Science and Technology, 16(6), p.426 - 433, 1979/00

 Times Cited Count:21

no abstracts in English

Oral presentation

Denitration characteristics of aqueous metal nitrate solution by microwave heating with carbon nanotube-containing alumina composite ceramic jacket

Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Nagakawa, Genta*; Tamaru, Ayaka*; Fukasawa, Tomonori*; Ishigami, Toru*; Fukui, Kunihiro*

no journal, , 

Microwave heating in combination with an external heating source has been used to improve powder properties by compensating for heat transfer losses. However, the external heating source in the microwave irradiation field may degrade the heating elements. A hybrid heating method has been developed to use composite ceramic jacket prepared by adding carbon nanotube (CNT) to alumina. To evaluate the effect of CNT-containing alumina composite ceramic jacket (CNT jacket), experiments were implemented. In both copper nitrate solution and nickel nitrate solution, the time to reach the maximum temperature was earlier when the CNT jacket was used than when the alumina jacket was used. The temperature of the nickel nitrate solution was kept at the maximum temperature when the CNT jacket was used, while the temperature tended to decrease after reaching to 280$$^{circ}$$C when the alumina jacket was used. The hybrid heating method using the CNT jacket can obtain metal oxides.

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