| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel assembly and a nuclear reactor core which allow improvement in maintenance work and repair work of a nuclear power plant.SOLUTION: A fuel assembly to be loaded to a core of a fast breeder reactor has a plurality of fuel rods 1A. Each fuel rod 1A includes a liquid nuclear fuel material 2, a hermetically sealed cladding tube 3 made of stainless steel, and an inner tube 22 made of Hastelloy-N (R). The hermetically sealed inner tube 22 is disposed in the cladding tube 3 to cover all the inside surface of the cladding tube 3. The liquid nuclear fuel material 2 is filled in the inner tube 22. The liquid nuclear fuel material 2 comprises, for example, a fluoride molten salt containing Th-232 and U-233 and is made liquid during operation of the fast breeder reactor. An outside surface of the cladding tube 3 is in contact with a liquid metal as a coolant. Since TI-208 produced by neutron absorption reaction of Th-232 does not flow into the liquid metal, maintenance work and repair work of structure members (primary system piping, primary system pumps, etc.) of the fast breeder reactor are improved. |
