Supercritical Water Cooled Reactor Fuel Assembly

A fuel assembly and water-cooled reactor technology, which is applied in the direction of reactor fuel elements, reactors, and greenhouse gas reduction, can solve the problems of complex structure, inapplicability, and differences in structural forms of the throttling parts of boiling water reactors, so as to improve neutron economy, Uniform moderation, favorable for installation and replacement

Active Publication Date: 2016-01-20
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The structure of the throttling part of the boiling water reactor is very complicated, and due to the structural difference between the fuel assembly of the boiling water reactor and the fuel assembly of the supercritical water-cooled reactor, the throttling part is not suitable for the fuel assembly of the supercritical water-cooled reactor

Method used

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  • Supercritical Water Cooled Reactor Fuel Assembly
  • Supercritical Water Cooled Reactor Fuel Assembly
  • Supercritical Water Cooled Reactor Fuel Assembly

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Such as figure 1 and figure 2 As shown, the supercritical water-cooled reactor flow regulating structure includes a distribution cylinder 16, and the upper end surface of the distribution cylinder 16 is provided with a main flow hole 161 and a plurality of auxiliary flow holes 162, and the auxiliary flow holes 162 are evenly distributed around the main flow hole 161. The cooling water enters the fuel assembly through the main distribution hole 161 , and the moderator enters the fuel assembly through the auxiliary distribution hole 162 to realize the distribution of the cooling water and the moderator. Wherein, the number of auxiliary flow holes 162 can be freely set according to the number of moderator tubes in the fuel assembly. The diameters of the main flow hole 161 and the secondary flow hole 162 can be set according to the working state of the fuel assembly. By replacing the invention with different apertures, the adjustment and distribution of cooling water and...

Embodiment 2

[0046] Such as figure 1 and figure 2 As shown, in this embodiment, on the basis of Embodiment 1, the main distribution hole 161 is designed as a stepped hole with a thin top and a thick bottom, and the step surface of the main distribution hole 161 is provided with a positioning groove 163 . The positioning slot 163 is used for remote operation. By inserting the long rod into the positioning slot 163, the present invention can be installed, disassembled or adjusted remotely, making the present invention more usable. Especially when the temperature is high, it is safe to prevent personnel from installing, disassembling or adjusting the present invention at close range.

Embodiment 3

[0048] Such as figure 1 and figure 2 As shown, on the basis of Embodiment 1, this embodiment also includes a positioning key 17, the diameter of the upper end of the distribution cylinder 16 is larger than the diameter of the lower end of the distribution cylinder 16, and the positioning key 17 is arranged on the outer circle of the lower end of the distribution cylinder face. The present invention is installed in the water hole of the lower plate of the core, and a stepped surface is obtained by changing the diameter of the distribution cylinder 16. The stepped surface can facilitate the installation of the present invention, improve the positioning accuracy, and realize the axial compression of the present invention. The positioning key is used to limit the circumferential rotation of the present invention.

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Abstract

The invention discloses a flow adjustment structure of a supercritical water cooled reactor. The flow adjustment structure comprises a distribution barrel, wherein a main shunting hole and a plurality of auxiliary shunting holes are formed in the upper end face of the distribution barrel; and the auxiliary shunting holes are uniformly formed around the main shunting hole. The adjustment structure is simple and is suitable for a fuel component of the supercritical water cooled reactor. The invention also discloses the fuel component of the supercritical water cooled reactor. The fuel component comprises a fuel stick box and the flow adjustment structure of the supercritical water cooled reactor, wherein the fuel stick box comprises a high temperature box and a low temperature box which are communicated with each other; the cross sectional area of a coolant runner in the high temperature box is greater than that of a coolant runner in the low temperature box; the high temperature box is made of stainless steel or nickel-based alloy; and the low temperature box is made of zirconium alloy. The flow adjusting structure has the advantages that compared with the existing fuel component, the fuel component has the advantages that the economical property of neutrons in a reactor is greatly improved, and the coolant and a moderator can be accurately distributed.

Description

technical field [0001] The invention relates to a reactor internal component, in particular to a flow regulating structure and a fuel assembly of a supercritical water-cooled reactor. Background technique [0002] The neutron economics of reactors has long been a major concern of the nuclear energy industry. The root of improving reactor neutron economy is to reduce neutron leakage and useless absorption. For fuel assemblies, the structural materials and cladding materials need to use alloys with less neutron absorption as much as possible. [0003] In a supercritical water-cooled reactor, the fuel assembly is a single-layer structure, and the internal cooling water channels are consistent. The cooling water enters from the inlet of the fuel assembly, is heated by the fuel rods, and then discharged from the outlet of the fuel assembly. Under this structure, the fuel rod will heat the temperature of the cooling water to be consistent. [0004] Due to the high operating pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/322
CPCY02E30/30
Inventor 刘晓张宏亮卢川周禹王留兵李浩王尚武张翼
Owner NUCLEAR POWER INSTITUTE OF CHINA
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