| 摘要 |
PROBLEM TO BE SOLVED: To uniformize the flow rate distribution of the flow of a coolant flowing in a core of a pressurized water nuclear reactor. SOLUTION: In the nuclear reactor having a nuclear reactor vessel 40 having a bottomed cylindrical vessel body 41 provided with a lower end plate 43 and a removable upper cover 13, a cylindrical reactor core tank 19 drooped and supported in the vessel body 41 for forming a downcomer 21 with an inner surface of the vessel body 41, and a lower part core supporting plate 23 expanding in a horizontal direction on a lower end part of the core bath 19 for forming a lower part plenum 53 by incorporating with the end plate 43, a plurality of coolant inlet nozzles 15 for opening to the downcomer 21 are integrally formed, with a space, on the upper part of the vessel body 41, and a step shaped projection 55 is arranged on the inner side upper part of the end plate 43 so as to face the lower end opening of the downcomer 21.
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