None

PNC TJ1635 97-001, 3 Pages, 1997/03

PNC-TJ1635-97-001.pdf:7.49MB

no abstracts in English

None

PNC TJ1635 95-001, 9 Pages, 1995/03

PNC-TJ1635-95-001.pdf:0.31MB

no abstracts in English

None

*

PNC TJ1605 91-002, 22 Pages, 1991/03

PNC-TJ1605-91-002.pdf:0.49MB

None

Development of the thermogravimetric analysis method using microwave heating and its application

Segawa, Tomoomi; Hamaba, Taishu*; Yoshida, Hideto*; Fukui, Kunihiro*

no journal, , 

In the field of reprocessing of spent nuclear fuel, the aqueous solution of uranyl nitrate and plutonium nitrate is converted to the mixed oxide powder (MOX raw powder) using the microwave heating method for direct denitration. In order to clarify the reaction mechanism of denitration of a metallic nitrate aqueous solution using microwaves, the novel thermogravimetric analysis unit using microwave heating was developed. The absorbed microwave energy can be measured by 2 power meters set on the both side of the raw material. The change in the temperature and the mass of the raw material can be also measured continuously. The process for synthesizing metallic oxide powders by the microwave denitration method was investigated using trihydrated copper nitrate aqueous solutions with this apparatus. As a result of this study, it was found that the reaction routes for microwave heating are the same as those for conventional external heating.

Characterization of microwave heating using CNT-containing alumina heating media

Tamaru, Ayaka*; Segawa, Tomoomi; Yamada, Masaaki*; 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 powder quality by microwave and external heating together. However, the use of external heating in a microwave irradiation field causes a problem of deterioration of equipment. Hybrid heating using CNT-containing alumina with a large relative permittivity as an external heating source has been studied. The characteristics of the hybrid heating in a cavity-type reactor and the relationship between the relative dielectric losses of the materials were evaluated. The relative dielectric losses of the CNT-containing alumina and sample powders were measured by the cavity resonator method and the MW-TG method, respectively. The relative dielectric loss measured by the MW-TG was consistent with the selectivity of heating and was confirmed to be an appropriate index for evaluating the microwave heating characteristics.