Diagram showing the vitrification process
Solutions containing fission products and minor actinides are processed by calcining at approximately 400C), and then vitrified by mixing with borosilicate glass frit. The resulting mixture is then heated to a temperature of approximately 1100C in an induction furnace and the molten glass is poured into a cylindrical container made of refractory steel. A lid is then fitted to the container and welded in place. The photograph shows glass being poured at Areva's vitrification shop in Marcoule, prior to transferring this activity to the plant in La Hague.