Thermodynamic analysis for molten corium stratification with U-Zr-O-Fe database
Source abstract
Abstract
Aided by CALPHAD (CALculation of PHAse Diagram) method, a self-consistent thermodynamic corium database of U-Zr-O-Fe system is established based on reoptimization of key binary and ternary subsystems. According to molten corium stratification thermodynamic analysis for STFM-Fe tests in MASCA project, the corium would separate into metallic liquid phase and oxidic liquid phase due to the existence of miscibility gap and their mass fraction and composition can be well predicted. Further, the density of the oxide phase is accurately calculated by a linear fitting relationship obtained from the measured oxide density, and the density of the metal phase is calculated by the empirical formula. Thus the molten corium would exhibit a two-layer structure with a higher density metal phase below and a lower density oxide phase above. The good agreement with the STFM-Fe tests indicates the reliability of the database to analyze the molten corium stratification which tends to improve the effectiveness of in-vessel retention strategy by providing the thermodynamic prediction.
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Research context
OpenAlex topics: Nuclear Materials and Properties · Fusion materials and technologies · Metallurgical Processes and Thermodynamics
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