Upper reflecting layer structure, reactor core structure and high-temperature gas-cooled reactor

Abstract

The invention discloses an upper reflecting layer structure. The upper reflecting layer structure is composed of a plurality of graphite bricks, wherein a cavity and a plurality of channels are formedin each graphite brick, and the cavities are formed in the upper portions of the graphite bricks and used for allowing a coolant to circulate; and the plurality of channels are arranged at the lowerparts of the graphite bricks, the inlet of each channel communicates with the corresponding chamber, and the outlets of the channels are uniformly distributed on the lower end surfaces of the graphitebricks. The invention further discloses a reactor core structure adopting the upper reflecting layer structure and a high-temperature gas-cooled reactor. According to the invention, the upper reflecting layer structure can distribute the coolant, so the uniformity of the coolant entering a reactor core fuel area is improved.

Description

technical field [0001] The invention belongs to the field of nuclear technology, and in particular relates to an upper reflection layer structure, a reactor core structure, and a high-temperature gas-cooled reactor. Background technique [0002] In the nuclear industry, the core of the prismatic high-temperature gas-cooled reactor is mainly composed of graphite bricks. The core is arranged neatly and regularly in a prismatic shape. The fuel assembly is layered along its axial direction and arranged in radial divisions in sequence, the upper reflective layer is located at the upper part of the fuel area, and the lower reflective layer is located at the lower part of the fuel area. The core of the high-temperature gas-cooled reactor uses helium as the coolant. After the coolant enters the chamber in the high-temperature gas-cooled reactor, it enters the cooling channel in the fuel assembly in the core through the coolant channel in the upper reflector. , the coolant is gradua...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing high-temperature gas-cooled reactors, such as the pebble bed high-temperature gas-cooled reactor, although there is an upper reflector layer, the shape is completely different from that of the prismatic graphite block, and it does not have the function of fluid distribution. In the high-temperature gas-cooled reactor, the structure of the upper reflective layer only has the basic function of reflecting neutrons, and the function of fluid distribution is not designed. The coolant channel of the graphite block of the upper reflective layer is a through hole, which is the same as the fuel graphite block.

When the coolant enters the fuel area through the upper reflector layer, there are problems such as uneven distribution of the coolant and large flow resistance, resulting in excessively high temperature in the local area of ​​the core fuel and excessive pressure loss in the core, which may be harmful to the high temperature gas-cooled reactor. negative impact on the safe operation of

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