A LARGE-SCALE PARTICLE-BASED SIMULATION OF HEAT AND MASS TRANSFER BEHAVIOR IN EAGLE ID1 IN-PILE TEST

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<p>The in-pile EAGLE ID1 test was conducted by Japan Atomic Energy Agency to demonstrate the effectiveness of the fuel assembly with an internal duct structure during a core disruptive accident in a sodium-cooled fast reactor. Post-test analysis using the SIMMER-III code are based on a multi-fluid model that uses empirical models in constitutive equations, making it difficult to accurately simulate multi-component, multi-phase flows with complex heat and mass transfer. In this study, a new computational fluid dynamics code based on the fully Lagrangian particle method was developed for the purpose of clarifying the failure mechanism of the inner duct wall of FAIDUS. The three-dimensional simulation of the ID1 test was performed to analyze a series of thermal hydraulic behaviors leading up to duct wall failure for a computational domain that included six fuel pins, i.e., 1/12.5 of the circumference of the test section. The simulations reasonably reproduced the heat transfer characteristics observed in the test, showing that the local contact of liquid steel with high thermal conductivity with the duct wall greatly enhances the heat transfer from the nuclear heating fuel to the duct wall. The present large-scale simulation produced the results that were essentially equivalent to those obtained in a smaller simulation system with three fuel pins in our previous work. The results support the validity of the conclusions of our analytical study regarding the molten pool-to-duct wall heat transfer mechanism that caused the thermal failure of the duct wall.</p>

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