Multi-maze type fuel transfer channel shielding structure

Abstract

The invention belongs to the technical field of a radiation shielding design of a nuclear island power plant of a nuclear power station, and particularly relates to a multi-maze type fuel transfer channel shielding structure. The structure is used for radiation shielding of a fuel transfer pipe running through a gap between a safety shell and an outer wall of a fuel plant, rays generated by a irradiated fuel assembly transported through the fuel transfer pipe are prevented from leaking out of the gap, the structure includes a plurality of shields disposed on the safety shell and the outer wallof the fuel plant and surrounding the fuel transfer pipe, and the shields are nested with one another to form a seismic telescopic seam of a maze structure. The structure has the advantages of high safety, low cost, less maintenance and good shock resistance.

Description

technical field [0001] The invention belongs to the technical field of radiation shielding design for nuclear island powerhouses of nuclear power plants, and in particular relates to a shielding structure for multiple labyrinth fuel transfer channels. Background technique [0002] Since the third-generation nuclear power plants have increased the limit safety earthquake (not less than 0.3g), a certain distance of seismic expansion joints needs to be left between the fuel transfer channel shields of different plants, which is the focus of radiation protection and shielding design. [0003] The fuel transfer channel is the channel connecting the reactor refueling pool and the spent fuel storage pool of the fuel plant. It is mainly composed of the fuel transfer tube and the shielding body of the fuel transfer channel. The two ends of the fuel transfer tube are respectively connected with the reactor refueling pool and the spent fuel storage pool. . It is mainly used for equipm...

AI Technical Summary

Problems solved by technology

The labyrinth wall of the scheme is located on the ground and is vulnerable to natural and man-made damage; the additional lead shield inside is expensive, and the fixing and installation methods are complicated, which is not easy to repair and maintain, and will affect the fuel transfer channel shield to a certain extent Anti-seismic performance, the integrity of the shielding body of the fuel transfer channel may be threatened during an earthquake

[0007] Due to the extremely strong radioactivity of the spent fuel assembly, it will have a great impact on the area near the transfer channel during the transfer process, resulting in restrictions on equipment overhaul, maintenance and replacement, as well as the flow of people and logistics, and the staff will also be exposed to greater radiation. dose

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