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

Abstract

The present invention relates to a nuclear reactor lower chamber cylinder-like flow distribution apparatus, which is arranged in the lower chamber inside the lower dome of a pressure container, and comprises a flow distribution cylinder, wherein one end of the flow distribution cylinder is provided with an outer flange, the flow distribution cylinder is fixed on the lower surface of the reactor core lower supporting plate in the pressure container through the outer flange, the cylinder wall of the flow distribution cylinder is uniformly provided with 5-8 layers of penetrating water flowing holes from top to bottom, various layers of the water flowing holes are arranged in a staggered manner, and the flow distribution cylinder and the reactor core lower supporting plate share the same axis line. According to the present invention, the reactor lower chamber structure is substantially simplified, and the stability and the reliability of the structure are improved; the coolant flow distribution of the nuclear reactor lower chamber is achieved, and the phenomenon of the uneven flow field on the reactor core inlet region is overcome, and the thermal-hydraulic requirements are met; and the nuclear reactor lower chamber cylinder-like flow distribution apparatus has characteristics of simple structure, cost reducing and economy improving.

Description

technical field [0001] The invention relates to the field of pressurized water reactor nuclear power plants, in particular to a cylindrical flow distribution device for a reactor lower chamber of a pressurized water reactor nuclear power plant. Background technique [0002] In order to meet the thermal and hydraulic requirements of the reactor and improve the overall performance of the reactor, the coolant entering the core must be evenly distributed. When the uniformity requirements are not met, a flow distribution device is often required. The space in the lower chamber of the reactor is limited, and the installation and maintenance of components are difficult. Therefore, on the premise of satisfying the flow distribution, the structure should be simplified as much as possible to improve stability and reliability. For the second-generation and improved pressurized water reactors of nuclear power currently in operation at home and abroad, the core measurements are all drawn...

AI Technical Summary

Problems solved by technology

In the third-generation pressurized water reactor core measurement is drawn from the upper head of the pressure vessel, but the structure and flow field of the lower chamber of the reactor are relatively complicated, and the flow-induced vibration affects the stability of the structure. At the same time, due to the complexity of the structure of the lower chamber , it is difficult to install and maintain

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