Corium Experimental Thermodynamics: A Review and Some Perspectives

More than 30 years ago a specialist meeting was held at Joint Research Center Ispra (Italy) from 15 to 17 January 1990 review the current understanding of chemistry during severe accidents in light water reactors (LWR). Let us consider that, end 1980s, thermodynamics introduced accident codes really poor. Only some equilibrium constants for few simple reactions between stoichiometric compounds were used as well correlations giving estimates solidus and liquidus temperatures. In same time, CALPHAD method developed full promise approximate thermodynamic properties complex thermochemical system by way critical assessment experimental data, definition physical model an optimisation procedure define values parameters. It evident that nuclear database had be with new technique obtain quite rapidly prominent progress knowledge thermochemistry research area. Discussions focused on important chemical phenomena could occur across wide range conditions damaged plant. The most pressing need improved models is identified condensed phase mixtures corium progression. This paper reviews more data production field thermodynamics. work has been conducted through multiple international programs (EURATOM, ISTC, OECD) specific studies national scale. capitalised databases such NUCLEA TAF-ID, IRSN CEA, respectively, are now degradation simulation codes. presented this paper. conclusion, we outline perspectives considered order address today’s tomorrow’s issues.