Our work on nuclear waste glass addresses the high-temperature dynamics of complex, multiphase glass-forming systems relevant to vitrification processes. We employ calorimetry, viscosity, and electrical conductivity measurements to characterise transport and thermophysical properties at processing temperatures. These experiments are complemented by rheological modelling and theoretical calculations of mass transfer to investigate bubble dynamics. Moreover, crystal-bearing rheology and phase separation phenomena in selected glass families are investigated using experiments and codes with direct implications for process stability and waste immobilisation performance. In this research lines, our group has a strong collaboration with French researchers.