Development of Immobilization Technique for Spent Molten Salt Waste from Pyrochemical Reprocessing

The probability of pyrochemical reprocessing in view of treatment and disposal of salt waste was studied. In considering the method of evaluating high level glass disposal, which is generated from wet reprocessing, we researched the certainty of vitrification of the two salt wastes, phosphate waste and surplus salt generated from the pyrochemical reprocessing. This report discovered that phosphate could be vitrified in fluoride phosphate glass and that the oxides converted from surplus salt by reacting with boric acid could be vitrified in borosilicate glass. It was found that both glasses are suitable for the present concept of radioactive glass disposal. Evaluating the engineering probability and the safety of glass after disposal, we confirmed the vitrification of the salt wastes from pyrochemical reprocessing as one of the promising methods for waste management and disposal.