Sealing structure for maintenance of helium circulator of high temperature gas-cooled reactor

Abstract

The invention relates to the technical field of reactor engineering, and particularly discloses a sealing structure for the maintenance of a helium circulator of a high temperature gas-cooled reactor. The sealing structure comprises a helium circulator gas inlet, a volute, and three triple eccentric butterfly valves with the same structure. The volute has two symmetric gas outlets which are located at the periphery of a diffuser of the helium circulator; one of the triple eccentric butterfly valves is located in front of the helium circulator gas inlet, and the other two triple eccentric butterfly valves are located behind the volute respectively. The sealing structure for the maintenance of a helium circulator of a high temperature gas-cooled reactor provided by the invention has a simple structure, is convenient for operation, can effectively prevent the leakage of the helium of a primary loop, farthest ensures the purity of a coolant of the helium of the primary loop, reduces the work cost of the maintenance of a nuclear power station, and shortens the total maintenance time of the nuclear power station.

Description

technical field [0001] The invention relates to the technical field of reactor engineering, in particular to a sealing structure used for maintenance of a main helium blower of a high-temperature gas-cooled reactor. 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, high power generation efficiency, and extremely wide uses. The overall structure of the primary circuit of a high temperature gas-cooled reactor nuclear power plant is as follows: figure 1 As shown, it includes a reactor pressure vessel 1' and a steam generator pressure vessel 5', which are connected by a hot gas conduit 3'. The reactor core is cooled by helium. The helium coolant has a rated pressure of 7MPa and is driven by the main helium blower. It is forced to circulate inside the reactor primary circuit, takes away heat from the core to hea...

AI Technical Summary

Problems solved by technology

At the same time, when the main helium fan is overhauled, the reactor primary circuit needs to be depressurized. How to ensure that the main helium fan is overhauled under the depressurized state of the reactor primary circuit and how to ensure that the outside air does not enter the reactor primary circuit is also a difficult problem, so the above two conditions are met. Article requirements are very difficult

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