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; Tsunoda, Naomi; Ogino, Naohiko*
PNC TN841 79-56, 16 Pages, 1979/10
Simulated HLLW from reprocessing plant of PNC at Tokai was solidified into sintered ceramics by normal-sintering or hot-pressing with addition of some oxides. Among various ceramic products obtained so far, the most preferable one was Nepheline types intered solids formed with addition of SiO/SUB2 and A1/SUB2/O/SUB3 to the Simulated waste calcine. The solid shows advantageous properties in leach-rate and mechanical strength, which possively comprise the ceramic product be a promising solid waste form. Other type of ceramic solids were prepared with addition of ZrO/SUB2 or MnO/SUB2, and some of them showed preferable characters.
Ogino, Naohiko*; ; Tsunoda, Naomi; *; *; *; *; *
PNC TN841 79-55, 21 Pages, 1979/10
The compositions of glass-ceramics for the solidification of HLLW were studied and the glass-ceramics in the diopside system was concluded to be the most suitable. Compared with the properties of HLW borosilicate glasses, those of diopside glass-ceramic were thought to be almost equal in leach rate and superior in thermal stability and mechanical strength. It was also found out that the glass in this system can be also crytallized simply by pouring it into a thermally insulated canister and then allowing it to cool room temperature.
Nagaki, Hiroshi; Ogino, Naohiko*; Tsunoda, Naomi; Segawa, Takeshi*
PNC TN841 79-54, 18 Pages, 1979/10
Some processes have been investigated to develop the technology of solidification of the high level radio active liquid waste generated from the nuclear fuel reprocessing plant at PNC. This report covers the present state of development of a joule heated ceramic melter and a direct megahertz induction heated furnace. An engineeing scale test has been performed by both of these melters. A joule heated melter could treat 45 kg glass an hour or 16 1/hr. A direct induction furnace was able to melt 5 kg glass per an hour or 1.8 1/hr. Both of the meltes were composed of refractory ceramics and electro-fused cast. Therefore, glass could be melted at above 1200 degrees celsius. At the higher temperature melting, the glass would be the more reliable, in general.
