FUEL GUIDE PIN, FUEL GUIDE PIN ATTACHMENT METHOD, CORE PLATE, AND NUCLEAR REACTOR

摘要

A fuel guide pin to be fixed to a core plate includes a shrink fit portion 2 which is inserted into a recessed portion 22a having a bottom and being provided in a core support plate 22 and fixed thereto by means of shrink fit; a pin portion 3 provided above the shrink fit portion 2 and projecting from an upper surface of the core support plate 22, over which a fuel assembly to be loaded on the core support plate 22 is inserted; and a constricted portion 4 which is provided between the shrink fit portion 2 and the pin portion 3 in a constricted shape having a smaller diameter than an outer diameter of the pin portion 3 and has a lower narrowed portion 4a smoothly narrowed toward the most constricted portion from the shrink fit portion side 2.