Square double-sided cooling annular fuel assembly

Abstract

The invention belongs to the technical field of nuclear fuel assemblies, and concretely relates to a square double-sided cooling annular fuel assembly. The invention aims at developing and designing the square double-sided cooling annular fuel assembly in order to solve the problems of easy fission, gas release amount increase, aggravated cladding corrosion and hydrogen absorption, fuel pellet swelling and accelerated growth of fuel elements and assemblies in the use process of existing rod fuel assemblies. The square double-sided cooling annular fuel assembly is characterized in that the square double-sided cooling annular fuel assembly comprises an upper tube seat, fuel rods, positioning grids, a lower tube seat, guiding tubes and an instrument tube; the fuel rod, the guiding tubes and the instrument tube are inserted in the positioning grids; the quantity of the positioning grids is more than one, and the positioning grids are sequentially arranged axially; the upper ends of the guiding tubes and the instrument tube are fixedly connected with the upper tube seat, and the lower ends are fixedly connected with the lower tube seat; and the lower ends of the fuel rods are suspendedand are not in contact with the lower tube seat, so the fuel rods expand up and down when irradiation growth of the fuel rods occurs. The square double-sided cooling annular fuel assembly significantly improves the economical property and safety of nuclear power and extends the service life of nuclear power plants.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel assemblies, in particular to a square double-sided cooling annular fuel assembly. Background technique [0002] During the operation of a nuclear power plant reactor, the performance of nuclear fuel is an important factor affecting the safety and economy of the reactor. Therefore, the research of fuel elements has been placed in a very prominent position in the world. By optimizing the design of fuel elements, adopting advanced structural materials, and improving the manufacturing process of elements, the various performances of nuclear fuel elements are continuously improved, and nuclear power is promoted to be safer and more efficient. direction of economic development. [0003] Safety and economy are the foundations of nuclear power development, and almost all nuclear power technology developments aim at increasing nuclear power safety and economy. Fuel elements are the core components o...

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Problems solved by technology

[0007] The purpose of the present invention is to develop and design a square double-sided cooling annular fuel assembly to solve the problem of increased fission gas release, cladding corrosion and hydrogen absorption, fuel pellet swelling, Problems with Exacerbated Radiation Growth of Fuel Elements and Assemblies

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