High-temperature gas cooled reactor helium compressor isolation pressure maintaining overhaul method and device

Abstract

The invention relates to a high-temperature gas cooled reactor helium compressor isolation pressure maintaining overhaul method and device, and belongs to the technical field of reactor equipment sealing and overhaul. When a reactor runs normally, a spiral lifting overhaul device in the overhaul device is arranged in helium atmosphere at the upper part of a pressure vessel. When maintenance is needed, a helium compressor is lowered to a lower limit position through the overhaul device, a pressure maintaining overhaul isolation valve is closed, a loop pressure boundary is reconstructed, and a to-be-maintained part is isolated outside for overhaul; after overhauling is completed, the overhauled helium compressor is jacked through the spiral lifting overhaul device and abuts against the uppersealing face to achieve pretightening force, and sealing is achieved; the spiral lifting overhaul device is driven by a motor and a speed reducer and is lifted along guide rails which are uniformly distributed on the inner wall and have a self-locking function; and a jacket cooling system exchanges heat with the metal wall surface of the equipment, cools the environment in the equipment, maintains a local low-temperature helium environment, and prevents insulation overtemperature failure of a helium compressor stator winding and failure of a gear motor.

Description

Technical field [0001] The invention relates to a high-temperature gas-cooled reactor helium compressor isolation and pressure maintenance maintenance method and a device thereof, belonging to the technical field of reactor equipment sealing and maintenance. Background technique [0002] The high-temperature gas-cooled reactor is a type of gas-cooled reactor that uses helium as the coolant. The core outlet temperature is close to 750-1000°C. The high-temperature gas-cooled reactor nuclear power plant uses helium compressors to drive the helium coolant to circulate and start the reactor. , Power operation and reactor shutdown and other working conditions provide sufficient flow of helium to pass through the primary loop system to take away the heat generated by the reactor core and ensure core cooling. The helium compressor in the demonstration project is located above the steam generator, and the helium compressor is at the hot end of the helium cycle. A nuclear secondary cooler ...

AI Technical Summary

Problems solved by technology

The helium compressor in the demonstration project is located above the steam generator. The helium compressor is at the hot end of the helium cycle. The helium in the motor cavity is cooled by a nuclear secondary cooler, so that the motor and the electromagnetic drive device work at Appropriate temperature. If there is a problem with the operation of the helium compressor during operation, the reactor needs to be completely shut down, the top cover is completely opened, and the helium compressor is hoisted out into the atmosphere isolation device (filled with helium) through the ring hoist, and the atmosphere is isolated. The device connects the maintenance environment with the primary circuit and isolates it from the outside world, forming a slightly positive pressure helium environment, preventing the air from entering the primary circuit when the main helium fan is disassembled, hoisted and reinstalled, affecting the performance of the reactor’s working medium, and the preparation of the maintenance conditions It takes about several weeks to work, and the shutdown time is longer, which will cause relatively large economic losses

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