Vertical silos for dry storage of spent fuel in nuclear power plants

Abstract

The invention discloses a vertical silo for dry storage of spent fuel in a nuclear power plant, which includes a silo, a top cover and a bottom plate, wherein the silo includes an inner silo and an outer silo, and the space between the inner silo and the outer silo is It has a first annular chamber, and when the spent fuel storage tank is stored in the silo, there is a second annular chamber between the inner silo and the spent fuel storage tank, and there is also a second annular chamber between the bottom of the inner silo and the bottom plate, which is connected with the first annular chamber and the spent fuel storage tank. The air flow channel of the air inlet connected to the second ring cavity; the upper area of ​​the silo is provided with an air inlet connected to the first ring cavity, the air inlet is provided with an air inlet protective cover, and the upper part of the top cover is provided with an air outlet. An air outlet protective cover is provided, the bottom of the silo is fixedly connected with the bottom plate, and the top cover is fixed on the upper part of the silo. Compared with the prior art, the vertical silo for dry storage of nuclear power plant spent fuel of the present invention can prevent the clogging of the ventilation opening, has high natural ventilation flow rate, good radiation shielding effect and safe overall structure.

Description

technical field [0001] The invention belongs to the field of dry storage of spent fuel discharged from nuclear power plant reactor cores, and more specifically relates to a vertical silo for dry storage of spent fuel in nuclear power plants. Background technique [0002] Vertical silos for dry storage of spent fuel (hereinafter referred to as "vertical silos") are mainly used to store and protect fuel storage tanks that contain sealed spent fuel assemblies. As important items for nuclear safety, vertical silos are used for long-term storage The main functions in the process include: 1) providing structural protection and radiation shielding for spent fuel storage tanks; 2) providing air convection channels, using natural air circulation to take away the decay heat of spent fuel components, so that spent fuel storage tanks can be fully cooled. [0003] At present, the vertical silo structure that is widely and maturely used in the world is generally an integrated vertical cyl...

AI Technical Summary

Problems solved by technology

[0005] 1) The air inlet is located at the bottom, which is easy to be blocked, which affects the thermal safety of the equipment and the sealing safety of the spent fuel in the storage tank. Due to the low position of the air inlet, it is easy to be attacked by the outside, which poses a safety hazard;

[0006] 2) The vents are all open to the outside world without shelter, and are easily blocked by foreign matter, which affects the ventilation performance;

[0007] 3) Insufficient natural ventilation heat transfer affects the spent fuel loading performance of equipment;

[0008] 4) The radioactive dose level in the air inlet area at the bottom of the silo is relatively high, which affects the safety of personnel radiation shielding;

[0009] 5) The storage tank is unconstrained, and the silo is easy to tip over under accident conditions, which affects the safety of the equipment structure

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