Simulation of the mixing process in FCIs with hydrodynamic fragmentation model

Simulation of the mixing process in FCIs with hydrodynamic fragmentation model 1 corresp first-author E-mail: sjtulq@sjtu.edu.cn E-mail: sjtulq@sjtu.edu.cn sjtulq@sjtu.edu.cn 1 School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China Fuel Coolant Interactions (FCIs) are important issues in nuclear reactor severe accident analysis. In FCIs, fragmentation model of molten droplets is a key factor to estimate degree of possible damage. In this paper, the mixing process in FCIs is studied by the simulation of MIXA experiment with hydrodynamic fragmentation model. The result shows that hydrodynamic fragmentation model underestimates the fragmentation rate of high temperature molten droplets under the condition of low Weber numbers. It is concluded that models based on thermal fragmentation mechanism should be adopted to analyze the FCI process and its consequence. Severe accident FCI Molten fuel droplet Fragmentation MIXA References Kondo S A , Brear D J , Tobita Y , et al . Status and achievement of assessment program for SIMMER-III, a multiphase, multicomponent code for LMFR safety analysis , Proceedings of Eighth International Topical Meeting on Nuclear Reactor Thermal-Hydraulics , 1997 , Japan . Status and achievement of assessment program for SIMMER-III, a multiphase, multicomponent code for LMFR safety analysis Morita K , Kondo S A , Tobita Y , et al . SIMMER-III application to fuel-coolant interactions , Proceedings of the OECD/CSNI Specialists Meeting on Fuel-Coolant Interactions , 1997 , Japan . SIMMER-III application to fuel-coolant interactions Berthoud G , Crecy F , Meignen R . Description of premixing with the MC3D Code including molten jet behavior modeling: Comparison with FARO Experiment results , Proceedings of the OECD/CSNI Specialists Meeting on Fuel-Coolant Interactions , 1997 , Japan . Description of premixing with the MC3D Code including molten jet behavior modeling: Comparison with FARO Experiment results Corradini M L , Kim B J , Oh M D . Progress in Nuclear Energy , 1988 , 22 ( 1 ): 1 - 117 . Progress in Nuclear Energy Cronenberg A W , Grolmest M A . Nuclear Safety , 1975 , 16 ( 6 ): 683 - 700 . Nuclear Safety Denham M K , Tyler A P , Fletcher D F . Experiments of the mixing of molten uranium dioxode with water and initial comparison with CHYMES code calculations , Proceedings of Fifth International Topical Meeting on Nuclear Reactor Thermal-Hydraulics , 1992 , USA . Experiments of the mixing of molten uranium dioxode with water and initial comparison with CHYMES code calculations Fletcher D F , Denham M K . Validation of the CHYMES mixing model , Proceedings OECD/CSNI Specialists Meeting on Fuel-Coolant Interactions , 1993 , USA . Validation of the CHYMES mixing model Meyer L . QUEOS: An experimental investigation of the premixing phase with hot spheres , Proceedings of Eighth International Topical Meeting on Nuclear Reactor Thermal-Hydraulics , 1997 , Japan . QUEOS: An experimental investigation of the premixing phase with hot spheres Cao X W , Tobita Y . Journal of Nuclear Science and Technology , 2001 , 38 ( 9 ): 721 - 728 . Journal of Nuclear Science and Technology Pilch M , Erdman C . International Journal of Multiphase , 1987 , 13 ( 6 ): 741 - 757 International Journal of Multiphase 10.1016/S1001-8042(07)60054-2 TL364+.4 Supported by National Natural Science Foundation of China (No.50576050) 2007-01-22 2007-08-20 2021-01-19 2007 Nuclear Science and Techniques 04 18