The concept of in-vessel retention (IVR) is the stabilization of the reactor pressure vessel (RPV) by cooling the outside vessel wall with water in a severe accident. This study offers detailed information on complex thermal hydrodynamic phenomena, including boiling and two-phase flows when external reactor vessel cooling through flooding of the RPV occurs. The thermal hydrodynamic phenomena in an external reactor vessel are simulated using a computational fluid dynamics (CFD) technique with a phase change heat/mass transfer approach for boiling and the volume of fluid (VOF) approach for two-phase flows. The simulation results give a better understanding of the heat transfer from molten corium to the coolant outside the vessel and of the natural circulation mechanism of cooling water, boiling, and two-phase flows in this system. Also, this study provides quantitative data, such as heat flux, natural circulation flow rates, and heat transfer coefficients at various cooling water temperatures.
- Nuclear Engineering Division
- Power Division
Numerical Analysis of Heat Transfer Phenomena When Mitigating Severe Accident With External Reactor Vessel Flooding
Hong, TH, Kim, HT, & Moon, CK. "Numerical Analysis of Heat Transfer Phenomena When Mitigating Severe Accident With External Reactor Vessel Flooding." Proceedings of the 2012 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference. Volume 4: Codes, Standards, Licensing, and Regulatory Issues; Fuel Cycle, Radioactive Waste Management and Decommissioning; Computational Fluid Dynamics (CFD) and Coupled Codes; Instrumentation and Controls; Fuels and Combustion, Materials Handling, Emissions; Advanced Energy Systems and Renewables (Wind, Solar, Geothermal); Performance Testing and Performance Test Codes. Anaheim, California, USA. July 30–August 3, 2012. pp. 457-462. ASME. https://doi.org/10.1115/ICONE20-POWER2012-54444
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