Abstract
After TMI and Chernobyl accidents, many efforts have been made to enhance the nuclear safety with passive features. Among such passive features, the passive containment cooling system has been suggested. A condensation experiment in the presence of non-condensable gas in a vertical tube of the passive containment cooling system has been performed to evaluate the heat removal capacity in a post-accident containment. Condensation heat transfercoefficients on a vertically mounted smooth tube have been obtained for total pressure ranging from 0.2 to 0.5 Mpa(abs), air fraction ranging from 0.05 to 0.25 and inlet cooling water temperature ranging from 30 to 70℃. It was confirmed the increase in the air fraction cause the decrease in the heat transfer coefficients.
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