Maintenance apparatus and maintenance process method for high-temperature gas cooled reactor control rod drive mechanism

Abstract

The invention belongs to the technical field of reactor maintenance, and particularly relates to a maintenance apparatus and a maintenance process method for a high-temperature gas cooled reactor control rod drive mechanism. According to the maintenance apparatus, a main cabin door II is arranged between a main cabin body and a transition cabin body, a main cabin door I is arranged between a transport cabin body and the main cabin body, the transport cabin body is provided with a transport cabin door, the transition cabin body is provided with a transition cabin door, a temperature sensor I, apressure sensor I and a helium gas concentration detector I are installed on the transport cabin body, a temperature sensor II, a pressure sensor II and a helium gas concentration detector II are installed on the main cabin body, a temperature sensor III, a pressure sensor III and a helium gas concentration detector III are installed on the transition cabin body, transport cabin lifting lugs arefixed above the transport cabin body, lifting lugs are fixed above the main cabin body, and a lifting hook is fixed on the transport cabin body. With the apparatus and the method of the present invention, the rapid disassembly and assembly of the control rod system can be achieved under the premise of no leakage of the atmosphere in the pressure container.

Description

technical field [0001] The invention belongs to the technical field of reactor maintenance, and in particular relates to a high-temperature gas-cooled reactor control rod driving mechanism maintenance device and a maintenance process method. Background technique [0002] The high-temperature gas-cooled reactor is a high-temperature reactor with graphite as the moderator and helium as the coolant. It is an advanced nuclear reactor with good inherent safety and high power generation efficiency. During nuclear power plant operation, the reactor core is cooled with helium coolant. During the operation of the reactor, the control rod system is used for reactivity control to realize various operation modes. During long-term operation, there is a demand for dismantling and overhauling the control rod drive mechanism. 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 drivin...

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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