The present invention provides a make-up water injection tank and an emergency core cooling system including the same. The make-up water injection tank includes the following: a body which is installed to be higher than a nuclear reactor and which injects inner make-up water to the nuclear reactor through a make-up water outlet through gravity and injects steam through a steam inlet when a nuclear reactor coolant is lost; and a condensation suppressing member which faces the steam inlet with the make-up water in the rear side in the body to prevent condensation by directly spraying the steam inputted through the steam inlet to the make-up water.
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