Device for residual heat removal of integrated reactor and its method

The present invention relates to a residual heat removal system of a nuclear reactor, the reactor and the steam connected to the generator and the cooling water storage unit is disposed at a position higher than the steam generator cooling the reactor, connected to the steam generator and in the cooling water storage section and flowing out of the cooling water is vapor-emitting portion which is converted into steam in the steam generator emits, is added to the reactor and the cooling water stored disposed therein and cooled with water after the heat exchange in the steam inside emitted from the steam discharge portion the cooling water storage arranged to surround the first storage vessel and the first storage container is provided so that the inlet portion in a spaced condition is formed one or more openings on one side and spaced apart with the air entering the interior through the aperture of the first containment vessel flows through the space is characterized in that it comprises a second containment is provided to cool the first containment vessel. Thereby, the re-use the water for cooling the reactor and cooling the first storage vessel with the outside air so there is permanently drivable by the available cooling effect without the need for continuous replenishment of the cooling water.