L-shaped header of steam generator including spiral tube and a coupling structure of L-shaped header and tube

A steam generator, comprising:

• a heat transfer tube assembly having a plurality of spiral heat transfer tubes arranged on a concentric circle;
• and
• a header formed to connect the heat transfer tube assembly and a nozzle,
• wherein one end of each of the plurality of spiral heat transfer tubes is extended in a vertical direction to form one end of the heat transfer tube assembly, and
• the header is disposed on an upper or lower side of the heat transfer tube assembly to be connected to one end of the heat transfer tube assembly along a vertical direction, and
• the header is connected along a horizontal direction to the nozzle disposed at one side of the header, and
• the header has an L-shape to switch the flow direction of fluid flowing in a vertical direction through one end of the heat transfer tube assembly to a horizontal direction so as to flow to the nozzle,
• wherein the header comprises:
• a tube plate member coupled to one end of the heat transfer tube assembly;
• a cover member fixed to an opposite side to a side to which one end of the heat transfer tube assembly is coupled in the tube plate member, and connected to an edge of the tube plate member to form a fluid flow space between the tube plate member and the cover member;
• and
• a nozzle connection member coupled to a side portion of the tube plate member and a side portion of the cover member to communicate with the flow space formed by the tube plate member and the cover member, and connected to the nozzle.