A flow distribution device for the lower chamber of a nuclear reactor

Abstract

The invention relates to a flow distributor of a nuclear reactor lower chamber, the flow distributor is arranged in a lower chamber in a lower end socket of a pressure vessel, and comprises a flow distribution plate, a connecting plate and a basic connecting plate, a reactor core lower support plate, the flow distribution plate, the connecting plate and the basic connecting plate are in the same axial line, and are orderly arranged from top to bottom; the flow distributor simplifies the reactor lower chamber structure, improves the stability and reliability, realizes coolant flow distribution of the reactor lower chamber, and overcomes an inhomogeneous flow field in a reactor core entrance region, and the flow distributor is simple in structure, reduces the cost, and improves the economical efficiency.

Description

technical field [0001] The invention relates to the field of pressurized water reactor nuclear power plants, in particular to a reactor lower chamber flow distribution device for pressurized water reactor nuclear power plants. Background technique [0002] In the second-generation and second-generation improved pressurized water nuclear reactors currently in operation, the core neutron flux measurement detectors are drawn from the lower head of the pressure vessel, so components such as instrument casings and penetrations are installed at the lower head. Instrument bushings, penetrations, grid plates, secondary support columns and other structures can stir the coolant flow field in the lower chamber to suppress the formation of vortices, and at the same time distribute the flow into the core evenly. However, the existence of penetrations at the lower head increases the risk of potential failure of the lower head, and the structure of the lower chamber is very complicated. T...

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Problems solved by technology

However, the presence of penetrations at the lower head increases the risk of potential failure of the lower head, and the structure of the lower chamber is very complex

The third-generation pressurized water reactor core measurement instruments are led out from the upper head of the pressure vessel, which greatly simplifies the structure of the lower chamber of the reactor, but will cause inhomogeneity in the flow field at the core inlet area. To meet the requirement of uniform distribution of coolant in the core and to improve the overall performance of the reactor, it is necessary to install a flow distribution device in the lower chamber of the reactor

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