Concept design development of the advanced vitrification melter in TVF

Aoshima, Atsushi ; Shiotsuki, Masao; Yamashita, Teruo 

TVF is unique operating vitrification facility in Japan constructed to vitrify HALW from TRP. In TVF, the total number of produced canisters is 247 and about 80% of HALW generated so far still remains in TRP. In TVF, a ceramic type melter was adopted of which design life time is set five years by structural material corrosion. Present melter is the second generation and future exchange of the second melter is inevitable. For the third melter, JAEA has been developing an advanced melter concept with prolonged design life time of twenty years and better noble metal drainability. This concept features two new technologies; skull layer and reverse viscosity operation mode. The former intends to decrease corrosion rate of refractory by forming low temperature glass zone on the surface. The latter intends to decrease viscosity of glass along wall lower than that of inside to remove accumulated noble metalby glass flow along wall. For both technologies, temperature control is a key point.