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A core flow distribution device for the lower chamber of reactor internals

A technology of flow distribution device and internal components, which is applied in the control of reactor fuel elements, reactors, and nuclear reactions, etc., can solve the problems such as disturbance and instability of core coolant entering, and achieve the effects of improving flow stability and eliminating eddy currents.

Active Publication Date: 2018-09-11
NUCLEAR POWER INSTITUTE OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a core flow distribution device for the lower chamber of the internals, which solves the problem of disturbance and instability when the core coolant enters in the prior art

Method used

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  • A core flow distribution device for the lower chamber of reactor internals

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Embodiment

[0020] Such as figure 1As shown, the present invention is a core flow distribution device for the lower chamber of reactor internals, including a lower core plate 1, a ring plate 2, an adjusting ring 3, and a bottom plate 4 made of the same grade of austenitic stainless steel , bolt column 5, water hole 6, filter screen 7, briquetting block 8, fastener 9, when the hanging basket assembly is assembled, turn the hanging basket assembly upside down, and then put the four ring plates 2 and the four adjusting rings 3 Alternately stacked, several stepped holes are opened on the ring plate 2, used to pass through the bolt column 5 and fix the adjustment ring 3, the upper end surface of the adjustment ring 3 and the ring plate 2 adopt H7 / s6 interference fit, the adjustment ring The lower end surface of 3 is connected with the ring plate 2 by clearance fit; a base plate 4 is placed on the top, and a plurality of stepped holes are set on the ring plate 2, and bolt columns 5 are used to ...

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Abstract

The invention discloses a core flow distribution device for a lower chamber of a stack internal component, comprising a bottom plate on which a circular ring plate and an adjustment ring are alternately stacked, and a bolt column passes through the circular ring plate and the adjustment ring and connects to the bottom plate. The bottom plate is fixed under the lower plate of the core, and a water flow hole is arranged on the bottom plate. In the present invention, a plurality of water flow holes are arranged on the bottom plate, and the space between the cylindrical structure and the reactor shell is used as a passage for the coolant. With a small amount of offset, after the upward movement along the axial length of the cylindrical structure, its lateral flow is gradually eliminated under the leadership of the axial movement, and when it finally reaches the lower plate of the core, the purpose of complete upward movement is achieved. Compared with the multi-directional flow mixing and then upward process in the prior art, the eddy current is greatly reduced or even eliminated, the flow stability of the coolant is greatly improved, and foreign objects above a certain size are prevented from damaging the main equipment.

Description

technical field [0001] The invention relates to an internal component of a pressurized water nuclear reactor, in particular to a core flow distribution device for the lower chamber of the internal component. Background technique [0002] When the core coolant flow distribution does not meet the requirements, a flow distribution structure is usually set in the lower chamber to meet the thermal hydraulic requirements. The known flow distribution structures of the lower chamber mainly include cylinder structure, plate structure, ellipsoid There are some problems in these structures: For example, the application number is: CN201210137211.0, and the name is: In the technical scheme of the nuclear power plant reactor flow distribution structure, the fixed head-shaped structure and the lower head 82 of the pressure vessel are in the lower cavity An annular coolant channel 84 is formed in the chamber, and the inlet of the coolant channel 84 is located at the bottom of the annular de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C7/32G21C3/322G21C19/04
CPCG21C3/322G21C7/32G21C19/04Y02E30/30
Inventor 张宏亮卢川方才顺刘晓顾益宇王留兵
Owner NUCLEAR POWER INSTITUTE OF CHINA
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