Passive residual heat removal system and atomic power plant comprising same

A passive residual heat removal system, comprising:

• a plate type heat exchanger configured to exchange heat between secondary system fluid and cooling fluid, wherein the secondary system fluid has received sensible heat in a reactor coolant system and residual heat in a core, and wherein the cooling fluid is introduced from an inside or outside of a containment;
• a circulation line configured to connect a steam generator to the plate type heat exchanger to form a circulation flow path of the secondary system fluid, wherein the steam generator is disposed at a boundary between a primary system and a secondary system;
• an emergency cooling water storage section formed to store the cooling fluid therewithin and installed at an outside of the containment;
• and
• a plurality of the plate type heat exchangers installed within the emergency cooling water storage section,
• wherein the plurality of the plate type heat exchangers are all connected to the circulation line to receive the secondary system fluid through the circulation line, and
• the circulation line is first branched into a plurality of lines in a position facing a plate type heat exchanger located at the center of the plurality of the plate type heat exchangers and the branched lines are connected to the plurality of plate type heat exchangers, respectively,
• wherein a lower part of each of the plate type heat exchangers is immersed into the cooling fluid within the emergency cooling water storage section to allow the cooling fluid within the emergency cooling water storage section and atmosphere outside the containment to pass through a plurality of first channels which are provided within each of the plate type heat exchangers, and an upper part of each of the plate type heat exchangers is protruded to an upper portion of the emergency cooling water storage section through the emergency cooling water storage section to discharge the cooling fluid and fluid evaporated by heat transfer with the secondary system fluid in the atmosphere to an outside.