In-pile flow distribution device of reactor of nuclear power station

Abstract

The invention discloses an in-pile flow distribution device of a reactor of a nuclear power station. The device is used for distributing flow of a reactor core coolant; the flow distribution device comprises a lower reactor core support plate, a surrounding basket-shaped structure and vertical columns, wherein the surrounding basket-shaped structure is fixed below the lower reactor core support plate and comprises a porous surrounding basket and an eddy-current confinement plate positioned at the bottom of the porous surrounding basket; a plurality of flowing holes are respectively formed in the porous surrounding basket and the eddy-current confinement plate; the vertical plates are vertically arranged between the eddy-current confinement plate and the lower reactor core support plate. The in-pile flow distribution device of the reactor of the nuclear power station is relatively simple in structure, and by stirring and mixing the coolant through the eddy-current confinement plate and the vertical columns, eddy-current of a lower chamber is effectively inhibited, and the structure of the lower chamber is prevented from vortex shedding. The coolant is subjected to twice flow distribution through the surrounding basket-shaped structure and the lower reactor core support plate, so that the distribution effect is better, and the flow distribution uniformity in a reactor core fuel component is better.

Description

technical field [0001] The invention relates to the technical field of nuclear power, and more specifically, the invention relates to an in-core flow distribution device of a nuclear power plant reactor. Background technique [0002] see figure 1 , the pressurized water reactor body of a nuclear power plant is composed of reactor pressure vessel 10, reactor internals, control rod drive mechanism, core components, and core instrumentation. 12 provide a reasonable runner. The coolant flows in from the inlet nozzle 100 of the reactor pressure vessel 10 , enters the annular descending chamber 102 , then enters the lower chamber 104 , and enters the core 12 after passing through the lower support plate 106 of the core, thereby realizing the cooling of the core 12 . However, since the lower head 108 of the pressure vessel 10 is generally spherical or disc-shaped, the lower chamber 104 surrounded by it and the core lower support plate 106 is approximately hemispherical. When the ...

AI Technical Summary

Problems solved by technology

This flow distribution structure has the advantage of simple structure, but it also cannot fully mix the vortex flow at the bottom of the pressure vessel, so the vortex inside and outside the head-shaped structure 46 still cannot be effectively suppressed

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