[en] The status of the following studies is given: inactive laboratory tests on vitrification of highly active fission products; the influence of alpha radiation on highly active glasses; solidification of highly active fission-product solutions; solidification of highly active wastes by thermite processes; separation of calcine in the VERA process and in a separate filter stage; melting of borosilicate-glass blocks in an electrode-heated ceramic melting system; and heat and mass transfer between the atomized drops of fission-product solution and the 450⁰C steam atmosphere of the VERA calciner