抄録
A Multi-Purpose Incinerating Melter System (MIMS) has been developed as a volume reduction technique for a wide variety of radwastes including flame retardants such as spent resin, and non-combustible materials such as concrete, glass and steel. In the MIMS, these wastes are incinerated and/or melted at temperatures between 1, 000 and 1, 500°C generated by fossil fueled burner to produce obsidian-like ingots with high integrity.
A demonstration test program was carried out from 1989 until 1991 using an engineering-scale demonstration unit. In the test program, various simulated wastes with traces of 60Co, 54Mn, 59Fe, 137Cs, 22Na and 106Ru were treated to obtain decontamination factor (DF) data and leach-resistance data of the products.
The summarized results drawn from the 13 runs of demonstrative operations are the following:
(1) Most involatile radionuclides are transferred into solified products.
(2) Global DF of the system excluding a HEPA filter ranged 1×104 thru 1×105 for 60Co, 2×102 thru 2×103 for 137Cs and 2×102 thru 1×104 for 106Ru.
(3) Leaching resistance of the solidified product is a match for that of a typical borosillicate glass waste form.
