Centering device for hoisting shell of reactor core of high-temperature gas cooled reactor

Abstract

The invention relates to a centering device for hoisting a shell of a reactor core of a high-temperature gas cooled reactor. The device comprises a top centering caging device and a bottom centering caging device. The top centering caging device is fixed on a primary flange of a reactor pressure vessel and the bottom centering caging device is fixed on a radial rib plate of the shell of reactor core in a supporting manner. While the shell of the reactor core is hoisted into the reactor pressure vessel, the top centering caging device can ensure that the outer wall of the shell of reactor core and the inner wall of the primary flange of the reactor pressure vessel can be within a minimum safe distance, and a bracket of the shell of reactor core and the inner wall of the reactor pressure vessel can be within a minimum safe distance. The bottom centering caging device adopts a bearing rolling structure, so that sliding friction and impact between the inner wall of the reactor pressure vessel and the shell of reactor core during hoisting can be prevented. All of the centering devices can be removed after finishing the hoisting of the shell of the reactor core. The novel centering device provided by the invention provides the safe and reliable guarantee for the large commercial high-temperature gas cooled reactor hoisting process.

Description

technical field [0001] The invention relates to a device structure for hoisting and centering the core shell of a high-temperature gas-cooled reactor, and in particular to the technical field of an overall hoisting and centering device for large-scale equipment and components. Background technique [0002] The reactor pressure vessel is an important part of the pressure boundary of the reactor coolant system. The reactor pressure vessel fixes and contains the core shell and reactor internals, so that the fission reaction of nuclear fuel is limited to a sealed space. It is composed of a primary circuit pipeline The pressure boundary of the high-pressure coolant is one of the second barriers to prevent the escape of radioactive substances. [0003] The high-temperature gas-cooled reactor core shell is the main component of the high-temperature gas-cooled reactor. Inside the high-temperature gas-cooled reactor core shell are graphite reactor internal components, which can form ...

AI Technical Summary

Problems solved by technology

The core shell itself has a large weight, a large area, and an installation height of tens of meters. Therefore, it is very difficult to hoist the core shell and place it inside the reactor pressure vessel. During the hoisting process, it is necessary to ensure that the core shell is in place and measured Adjustment, leveling and final precise positioning, that is, centering, should avoid damage caused by the collision between the core shell and the reactor pressure vessel during hoisting, which will cause major safety hazards

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