Multi-station hoisting device for overhauling control rod driving mechanism of high-temperature gas cooled reactor

Abstract

The invention provides a multi-station hoisting device for overhauling a control rod driving mechanism of a high-temperature gas cooled reactor. The multi-station hoisting device for overhauling the control rod driving mechanism of the high-temperature gas cooled reactor comprises a framework, a shell, a first hoisting assembly, a second hoisting assembly and a rotatable mounting plate, wherein the shell sleeves the outer side of the framework; the framework is provided with a first mounting position and a second mounting position; the first mounting position is selectively provided with the first hoisting assembly; the second mounting position is selectively provided with the second hoisting assembly; the first end of the rotatable mounting plate is connected with the framework; the second end of the rotatable mounting plate is used for being rotatably connected with an atmosphere isolation device; and the rotatable mounting plate is further provided with a hollowed-out position to allow the first hoisting assembly and the second hoisting assembly to be hoisted on control rod driving mechanisms below the atmosphere isolation device through the hollowed-out position. After the atmosphere isolation device is installed at a time, the multiple control rod driving mechanisms of any unit under the atmosphere isolation device can be hoisted and transferred, and leakage of helium in a loop and diffusion of radioactive graphite dust and other substances can be effectively prevented in the hoisting process.

Description

technical field [0001] The disclosure belongs to the technical field of reactor maintenance, and in particular relates to a multi-station hoisting device for the maintenance of a high-temperature gas-cooled reactor control rod drive mechanism. Background technique [0002] During the operation of the reactor, the control rod system is used to control the reactivity to realize different modes of operation. During long-term operation, there is a demand for dismantling and overhauling of the control rod drive mechanism and replacement of electrical components. The casing of the control rod driving mechanism of the high temperature gas-cooled reactor is a part of the pressure boundary of the primary circuit. Once the driving mechanism is removed, the pressure boundary of the primary circuit will be destroyed, resulting in the destruction of the original helium atmosphere, and there is a risk of radioactive gas release in the reactor. In addition, the primary circuit core of the...

AI Technical Summary

Problems solved by technology

The high temperature gas-cooled reactor control rod drive mechanism casing is part of the pressure boundary of the primary circuit. Once the drive mechanism is removed, the pressure boundary of the primary circuit will be destroyed, resulting in the destruction of the original helium atmosphere, and there is a risk of radioactive gas release in the reactor.

In addition, the primary circuit core of a high-temperature gas-cooled reactor is composed of graphite, carbon and other structures, which are easy to absorb moisture. If more impurities are introduced into the primary circuit system during the maintenance process, the construction period for helium purification and dehumidification before the next reactor start-up will be extended

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