Method for manufacturing core barrel and core barrel

A method for manufacturing a core barrel which is to be disposed in a reactor pressure vessel of a pressurized water reactor and is to hold a reactor core including a fuel assembly, the method comprising:

• welding one end part of a short ring to a lower core support plate;
• machining the lower core support plate to which the short ring is welded, the machining of the lower core support plate including:
• forming a placement surface on which the fuel assembly is to be placed;
• and
• forming a fuel alignment pin hole, in which a fuel alignment pin for positioning the fuel assembly is to be inserted;
• and
• welding, after the machining of the lower core support plate, a main body barrel which covers the reactor core including the fuel assembly to be placed on the placement surface to the other end part of the short ring.