Pressure vessel refueling top cover lifting appliance for marine nuclear power platform and hoisting method thereof

Abstract

The invention discloses a pressure vessel refueling top cover lifting appliance for a marine nuclear power platform and a hoisting method thereof, and relates to the field of pressure vessel refueling. A pressure vessel comprises a top cover and a vessel body, a vessel lifting lug is arranged on the upper end face of the top cover, and a primary shielding water tank is arranged at the periphery ofthe pressure vessel. The top cover lifting appliance comprises an upper end connecting part and a lower end power part, the upper end connecting part is detachably fixed to the vessel lifting lug, the lower end power part is fixedly connected with the upper end connecting part, and the lower end power part is used for acting on the primary shielding water tank and supplying the downward installing and upward detaching power to the top cover through the upper end connecting part. The pressure vessel refueling top cover lifting appliance can be applied to pressure vessel top cover lifting and installing operation of the marine nuclear power platform.

Description

technical field [0001] The invention relates to the field of pressure vessel refueling, in particular to a top cover hoist for refueling a pressure vessel of a marine nuclear power platform and a hoisting method thereof. Background technique [0002] The marine nuclear power platform is an offshore floating nuclear power plant. The platform stack power is 100MWt×2 levels, the electric power is 25MWe×2 levels, and the service life is 40 years. After a period of operation, the platform needs to replace spent fuel and install new fuel. for 1.5 years. If the platform is to unload the spent fuel from the core, the top cover of the pressure vessel must be assembled and disassembled. [0003] At present, the refueling of nuclear power plants is mainly carried out between the reactor building and the fuel building. In the reactor building, a reactor cavity pool and a refueling pool are arranged along the 270°-90° axis. The reactor cavity is located directly above the reactor pit, ...

AI Technical Summary

Problems solved by technology

[0004] The spatial layout of the marine nuclear power platform is very different from that of the land-based nuclear power plant. The structure is more compact, and the corresponding space for the disassembly of the pressure vessel top cover becomes smaller. When the cover is closed, it is easy to shake and cause collisions during the disassembly process, which is not conducive to the safe disassembly of the top cover of the pressure vessel

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