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Nominations open for CNTA awards
Citizens for Nuclear Technology Awareness is accepting nominations for its Fred C. Davison Distinguished Scientist Award and its Nuclear Service Award. Nominations for both awards must be submitted by August 1.
The awards will be presented this fall as part of the CNTA’s annual Edward Teller Lecture event.
Koichi Asakura, Yoshiyuki Kato, Hirotaka Furuya
Nuclear Technology | Volume 162 | Number 3 | June 2008 | Pages 265-275
Technical Paper | Fuel Cycle and Management | doi.org/10.13182/NT08-A3955
Articles are hosted by Taylor and Francis Online.
The characteristics and sinterability of UO2-PuO2 mixed oxide (MH-MOX) powder prepared by the microwave heating denitration method were measured and compared with those of UO2 (ADU-UO2) powder prepared by the ADU method. Furthermore, the degree of surface roughness and flowability of MH-MOX powder were evaluated and also compared with those of ADU-UO2 powder. The degree of surface roughness of ADU-UO2 powder calcined at temperatures >700°C significantly decreased, and its sintered density also dropped below 80% theoretical density. However, the degree of surface roughness and sinterability of MH-MOX powder calcined at 950°C were higher than those of ADU-UO2 powder. These results could be understood using the concept of Hüttig and Tamman temperatures, which is commonly cited for ceramic materials. The flowabilities of MH-MOX and ADU-UO2 powders decreased with an increase of compressibility, and they were categorized as non-free-flowing according to Carr's theory on powder flowability. It is, therefore, necessary for the mixed powder of MH-MOX powder, ADU-UO2 powder, and dry recycled MOX scrap powder to be granulated to provide a free-flowing feed to the pelletizing press in the MOX pellet fabrication process.
