Nuclear power plant reactor flow distribution structure

Abstract

The invention discloses a flow distribution structure of a reactor of a nuclear power station. The flow distribution structure is used for distributing the flow of coolant of a cooled reactor core and comprises a reactor core lower supporting plate and an end-socket-shaped structure fixed on the reactor core lower supporting plate; and the end-socket-shaped structure comprises an end socket with drain holes. Compared with the prior art, the flow distribution structure of the reactor of the nuclear power station has the advantages that the shape of a coolant channel is changed through the end socket, so that characteristics of a flow field of a lower cavity are improved effectively, vertex shedding of reactor internals in the lower cavity is avoided, the flow of the coolant is distributed through the drain holes of the end socket, and uniformity of flow distribution of fuel assemblies entering the reactor core is perfect.

Description

technical field [0001] The invention relates to the technical field of nuclear power, and more specifically, the invention relates to a reactor flow distribution structure of a nuclear power plant. 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 coolan...

AI Technical Summary

Problems solved by technology

However, the number of connecting bolts in the above-mentioned flow distribution structure 30 is too many, and the structure is relatively complicated; the holes on the mesh orifice plate 302 are square, and the orifice structure is processed by forging, and the cost is also high; and the flow distribution effect of this structure But it is not good, the coefficient of non-uniformity is about 20%

Images