NUCLEAR REACTOR STRUCTURE OF PRESSURIZED WATER REACTOR

PROBLEM TO BE SOLVED: To provide a nuclear reactor structure for a pressurized water reactor, which has a shape and arrangement capable of decreasing flow resistance.SOLUTION: A nuclear reactor structure for a pressurized water reactor includes: a reactor vessel 1 which stores a reactor core 9 and which has an inlet nozzle 2 and an outlet nozzle 13 on its upper side wall; a core barrel 3 which is provided to an outer periphery of the reactor core 9 in the reactor vessel 1 and which forms an annular downward flow channel together with the inside of the reactor vessel 1; a lower core support plate 8 which extends in a horizontal direction, which is connected to a bottom edge of the core barrel 3, and which forms a lower plenum 6 together with the reactor vessel 1; and a flow arrangement member 31 which is provided on an outer wall surface of the core barrel 3 and which is installed at a position facing the inlet nozzle 2. The flow arrangement member 31 may be formed in a shape having a protrusion with a smoothly curved surface.