FUEL ROD AND FUEL ASSEMBLY

摘要

[Problem to be Solved] To provide a fuel rod and a fuel assembly that can make thermal power uniform along an axial direction and lengthen an operation cycle. [Solution] In a first fuel rod 41 and a second fuel rod 42 each containing nuclear fuel and burnable poison for reducing a nuclear reaction of the nuclear fuel to be loaded in a pressurized water reactor, the gadolinium content rate of the first fuel rod 41 and the second fuel rod 42 is increased from both end portions toward a center portion in an axial direction. In a fuel assembly including the first fuel rod 41 and the second fuel rod 42, the first fuel rod 41 and the second fuel rod 42 are loaded in such a manner that a large percentage of the second fuel rod 42 that is a low-gadolinium fuel rod is arranged on an outer side than the first fuel rod 41 that is a high-gadolinium fuel rod.