Spent fuel rod storage grillwork for nuclear power plant

Abstract

The invention discloses a spent fuel rod storage grillwork for a nuclear power plant in the field of nuclear power equipment. The spent fuel rod storage grillwork comprises a lower supporting plate and a grillwork body defined by a plurality of peripheral plates, wherein a plurality of small spent fuel rod storage chambers which are positioned on the top of the lower supporting plate and are regularly hexagonally prismatic steel pipes are arranged in the grillwork body; the small spent fuel rod storage chambers are arranged on the top of the lower supporting plate in a honeycomb manner; a spent fuel rod storage cavity with openings in two ends is formed in the center of each small spent fuel rod storage chamber; a bottom overflowing through hole formed in the lower supporting plate is positioned right under the spent fuel rod storage cavity of each small spent fuel rod storage chamber. The spent fuel rod storage grillwork has the technical effects that the inertia moment, the section modulus and the anti-bending capacity of the single small spent fuel rod storage chamber in the spent fuel rod storage grillwork for the nuclear power plant are improved, and the spent fuel rod storage amount in a unit volume in the spent fuel rod storage grillwork for the nuclear power plant can be increased.

Description

technical field [0001] The invention relates to a storage rack for spent fuel rods used in nuclear power plants in the field of nuclear power equipment. Background technique [0002] Spent fuel rods are also called irradiated nuclear fuel rods. That is, the nuclear fuel rods that have been burned in the reactor. Nuclear fuel rods are bombarded by neutrons in the nuclear reactor to undergo a nuclear reaction, and are discharged from the reactor after a certain period of time to form spent fuel rods. Spent fuel rods contain a large amount of unused fertile materials such as 238U or 232Th, unburned and newly formed fissile materials such as 239Pu, 235U or 233U, and neptunium, americium, curium and other supermatters produced during the irradiation process. Uranium, in addition to fission elements 90Sr, 137Cs, 99Tc and so on. After the spent fuel rods are taken out of the nuclear power plant reactor, they are hoisted into the spent fuel rod storage grid, and the spent fuel ro...

AI Technical Summary

Problems solved by technology

Such a spent fuel rod storage chamber has weak neutron adsorption capacity, and a cladding plate must be added on the outer wall of the regular square prism-shaped steel pipe.

On the other hand, the rectangular prism-shaped steel pipe has a small moment of inertia, weak bending resistance, and low section modulus, resulting in low mechanical strength of the spent fuel rod storage chamber. Therefore, a partition must be provided in the spent fuel rod storage grid. plates separate adjacent spent fuel rod storage compartments

Therefore, the strength of the spent fuel rod storage grid is weakened, the steel consumption in the manufacturing process is increased, and the cost is increased. At the same time, it is not conducive to storing more spent fuel rod storage cells in the spent fuel rod storage grid per unit volume.

The above factors all limit the use of spent fuel rod storage grid modules for nuclear power plants, resulting in various restrictions

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