A two-phase natural circulation cooling has been proposed to remove melted core decay heat by external core catcher cooling system during sever accident scenario. In this paper, two types of the core catcher cooling loops, one with heated loop and the other adiabatic loop simulated with air water system are analytically studied. First, a scaling analysis was carried out for natural circulation flow in a closed loop. Based on the scaling analyses, simulation of two-phase natural circulation is carried out both for air–water and steam–water system in an inclined rectangular channel. The heat flux corresponding to the decay heat is simulated with steam generation rate or air flux into the test section to produce equivalent flow quality and void fraction. Design calculations were carried out for typical core catcher design to estimate the expected natural circulation rates. The natural circulation flow rate and two-phase pressure drop were obtained for different heat inputs or equivalent air injection rates expressed as void fraction for a select downcomer pipe size. These results can be used to scale a steam water system using scaling consideration presented. The results indicate that the air–water and steam water system show similar flow and pressure drop behavior.
Study of Two-Phase Natural Circulation Cooling of Core Catcher System Using Scaled Model
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received June 29, 2014; final manuscript received January 12, 2015; published online April 15, 2015. Assoc. Editor: Suman Chakraborty.
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Revankar, S. T., Song, K., Rhee, B. W., Park, R. J., Ha, K. S., and Song, J. H. (September 1, 2015). "Study of Two-Phase Natural Circulation Cooling of Core Catcher System Using Scaled Model." ASME. J. Thermal Sci. Eng. Appl. September 2015; 7(3): 031006. https://doi.org/10.1115/1.4030249
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