Phases involved in the corrosion of zircaloy by hot water (350° C)
1981; Elsevier BV; Volume: 99; Issue: 2-3 Linguagem: Inglês
10.1016/0022-3115(81)90206-3
ISSN1873-4820
Autores Tópico(s)Thermodynamic and Structural Properties of Metals and Alloys
ResumoIn order to understand the stratification process that may occur in the late phase of the fuel degradation during a severe accident in a PWR, the thermodynamic knowledge of the U-Zr-O system is crucial. The presence of a miscibility gap in the U-Zr-O liquid phase may lead to a stratified configuration, which will impact the accidental scenario management. The aim of this work was to obtain new experimental data in the U-Zr-O liquid miscibility gap. New tie-line data were provided at 2567 ± 25 K. The related thermodynamic models were reassessed using present data and literature values. The reassessed model will be implemented in the TAF-ID international database. The composition and density of phases potentially formed during stratification will be predicted by coupling current thermodynamic model with thermal-hydraulics codes.
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