Journal of Chromatography & Separation Techniques
Open Access
ISSN: 2157-7064
ISSN: 2157-7064
Pham Thi Tam Ngoc
University of Natural Ressource and Environnement, Vietnam
Posters & Accepted Abstracts: J Chromatogr Sep Tech
The operating conditions of mixed oxide fuels (MOX) in Sodium cooled Fast Reactor (SFR) are very severe combining high temperature, high linear rating and high temperature gradient. In the nominal operating conditions of a SFR, the linear power is around 2 kW/cm3 and the temperature varies from 2500K down to 800K between the center and the periphery of the oxide fuel pellets. Due to those conditions, the volatile Fission Products (FP) like cesium and tellurium generated in the central region of the fuel pellet migrate outward through the radial cracks of the fuel matrix. At high burn up, a mixture of compounds of FP is formed in the fuel-cladding gap. This layer of FP compounds located between the external surface of the fuel pellet and the inner cladding surface is called in french the Joint Oxyde Gaine (JOG). The knowledge of phase equilibria and thermodynamic properties of the Cs��?Te system is thus crucial for understanding and modeling the diffusion processes during the formation of the JOG. In this work, we present the review of phase diagram, crystallographic data and thermodynamic data of the Cs��?Te binary system. The thermodynamic modeling of this system is also performed with the aid of the Thermo-Calc software. The thermodynamic descriptions derived in this work are based on the databases of Scientific Group Thermodata European (SGTE) and TBASE (ECN, Petten, Netherland) for the pure elements and the gaseous species. The compound formation and liquid mixing Gibbs energy ex- pressions are obtained by a least square optimization procedure. Comparisons between calculated and available experiments results are presented. A satisfactory agreement is achieved.
Email: phamtamngoc@yahoo.fr