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Square double-sided cooling annular fuel assembly

A fuel assembly, double-sided cooling technology, applied in the direction of reactor fuel elements, assembly of fuel elements, nuclear power generation, etc., can solve the problem of increased irradiation growth of fuel elements and assemblies, increased release of fission gas, swelling of fuel pellets, etc. problem, achieve the effect of lowering temperature, reducing output power and reducing flow resistance

Pending Publication Date: 2019-06-25
CHINA INSTITUTE OF ATOMIC ENERGY
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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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  • Square double-sided cooling annular fuel assembly
  • Square double-sided cooling annular fuel assembly
  • Square double-sided cooling annular fuel assembly

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0046] Such as figure 1 and figure 2 As shown, a square double-sided cooling annular fuel assembly includes an upper tube base 1 , a fuel rod 2 , a spacer grid 3 , a lower tube base 4 , a guide tube 5 and an instrument tube 6 . Fuel rods 2 , guide tubes 5 and gauge tubes 6 are inserted into the spacer grid 3 . There are a plurality of positioning grids 3, which are arranged in sequence along the axial direction. The upper ends of the guide tube 5 and the instrument tube 6 are fixedly connected with the upper tube base 1 , and the lower ends are fixedly connected with the lower tube base 4 . The lower end of the fuel rod 2 is suspended and not in contact with the lower tube base 4, so that when the fuel rod grows by irradiation, the fuel rod can expand to the upper and lower ends.

[0047] There are eight to thirteen spacer grids 3 arranged in seque...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/322G21C3/34
CPCY02E30/30
Inventor 张爱民季松涛何晓军史宝磊刁均辉张培升张毅高永光徐西安邹远方胡立强
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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