Reactor internal on lower part of reactor

Abstract

Reactor internals in a lower reactor comprise a reactor pressure vessel(1), a reactor core provided in the reactor pressure vessel(1), a supporting lower plate(2) of the reactor core fixed to the bottom of the reactor core and a flow distribution device(3) provided with several circular openings. The flow distribution device(3) comprises an upper distribution plate, a middle distribution ring fixedly connected to the bottom of the upper distribution plate along the periphery direction, a lower distribution plate fixedly connected to the bottom of the middle distribution ring along the periphery direction. Several evaginable protruding sections are provided on the top of the upper distribution ring. The evaginable protruding sections of the upper distribution ring are fixedly connected to the supporting lower plate (2) of the reactor core. The reactor internals in a lower reactor have a simple structure, an even flow distribution and a small resistance coefficient, and are easy to replace and repair.

Description

technical field [0001] The invention relates to a lower reactor internal component, in particular to a reactor lower internal component with simple structure, uniform flow distribution, small resistance coefficient and easy replacement and maintenance. Background technique [0002] The pressurized water reactor contains a loop cycle, including a primary loop and a secondary loop. The primary loop completes the export of heat from the reactor, and conducts it to the secondary loop through the steam generator to drive the steam turbine to generate electricity. The primary loop is mainly composed of the reactor pressure vessel, reactor internals, fuel assemblies, steam generators, main pumps, and pipelines. [0003] The fuel assembly is placed in the pressure vessel, and the support function is realized by the internal components of the reactor. The nuclear fuel maintains a controllable chain fission reaction in the reactor to generate energy. The energy generated by nuclear f...

AI Technical Summary

Problems solved by technology

The flow distribution of this structure is relatively ideal, but because the flow distribution ring is directly welded on the pressure vessel, it cannot be replaced during the entire service life, and the risk is high. In addition, the resistance coefficient of the structure itself is relatively high

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