A flow distribution device and deflector in a nuclear reactor with hat-shaped drainage

Abstract

The invention discloses a flow distribution device in a nuclear reactor with cap-shaped drainage and a deflector, the deflector includes a first guide part, a second guide part and a third guide part; the first guide part , the second guide part and the third guide part are all annular plates and the cross-sections in the vertical direction are circular arc structures, and the first guide part, the second guide part and the third guide part are all provided with a number of first Through holes, the first through holes are respectively perpendicular to the surface of each guide part, the second guide part is arranged inside the first guide part, the second guide part and the first guide part are connected by a second rib, The third guide part is arranged inside the second guide part, and the third guide part and the second guide part are connected by a third rib. The diverter plate of the invention can change the moving path of the coolant in the lower chamber, prevent the coolant from eddy current in the lower chamber, and make the flow even when it finally enters the support plate of the core, and has the advantage of simple structure.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors in pressurized water reactor nuclear power plants, in particular to a nuclear reactor internal flow distribution device and a deflector with hat-shaped drainage. Background technique [0002] In order to ensure the thermal and hydraulic requirements of the pressurized water reactor and meet the overall performance of the reactor, the flow of coolant entering the core must be evenly distributed. The main function of the flow distribution device in the lower chamber is to mix and eliminate the vortex of the coolant entering the lower chamber and perform flow distribution, so as to promote the uniform flow distribution of the coolant entering the core through the lower chamber, so as to ensure that the core fuel assemblies can be fully cooling. [0003] Since the lower head of the pressure vessel is mostly spherical, and the lower chamber surrounded by the core support plate is hemispherica...

AI Technical Summary

Problems solved by technology

[0003] Since the lower head of the pressure vessel is mostly spherical, and the lower chamber surrounded by the core support plate is hemispherical, when the coolant flows in from the inlet nozzle of the pressure vessel and enters the lower chamber from the annular descending chamber, it will Due to the sharp change of the flow channel and the large depth of the hemispherical head, a large number of eddy currents are generated in the lower chamber, resulting in uneven flow distribution into the core. In order to solve this technical problem

The existing flow distribution device is usually composed of flow distribution plate, vortex elimination plate and foundation connection plate and other main components. Such a flow distribution device will cause complex structure, large pressure drop, insignificant vortex elimination effect and enter the core support plate. The flow rate is large in the middle and small around

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