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Sleeve type fuel assembly and supercritical water cooled reactor

A fuel assembly and sleeve-type technology, applied in the field of nuclear reactors, can solve the problems of complicated fuel assemblies and core structures, and achieve the effects of reducing the ineffective flow area, simplifying the core structure, and enhancing the heat transfer capability of the coolant.

Active Publication Date: 2020-02-21
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a casing-type fuel assembly capable of realizing the implicit dual-flow flow of coolant, which can effectively solve the problems caused by the existing moderating water rod, multi-flow design of coolant, and high-low temperature fluid splitting technology. Complicated components and core structure, while ensuring core coolant flow rate, enhanced heat transfer capability and safety

Method used

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  • Sleeve type fuel assembly and supercritical water cooled reactor
  • Sleeve type fuel assembly and supercritical water cooled reactor
  • Sleeve type fuel assembly and supercritical water cooled reactor

Examples

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Embodiment 1

[0032] Such as figure 1 , figure 2 As shown, a sleeve-type fuel assembly, the fuel assembly 5 along the radial direction from the inside to the outside is an inner tube 2 and an outer tube 1. The radius of the inner tube 2 is 90.5 mm, and the wall thickness is 1.0 mm. , the radius of the outer tube 1 is 128 mm, and the wall thickness is 2.0 mm. The area surrounded by the inner tube 2 is an inner area, and the inner area fuel rods 3 are arranged in the inner area. The area in between is the outer area, and the outer area is arranged with the outer area fuel rods 4, the outer diameter of the inner area fuel rods 3 and the outer area fuel rods 4 is Φ9.5mm, the thickness of the cladding is 0.57mm, and the fuel core is UO 2 Ceramic fuel, the diameter of the core is 8.19mm, and the cladding material is stainless steel. The upper part of the outer tube 1 is an open structure, which is the inlet of the coolant, and the lower part is a closed structure, which is used to isolate the ...

Embodiment 2

[0034] Such as image 3 , Figure 4 As shown, a supercritical water-cooled reactor comprising the casing type fuel assembly described in Embodiment 1, the supercritical water-cooled reactor is composed of 211 boxes of fuel assemblies 5 and 372 guide pipes 6, and the fuel assemblies 5 are formed according to the shape of an equilateral triangle The grid is arranged, and the guide tube 6 is arranged at the center of the equilateral triangle area formed by three adjacent fuel assemblies 5. The center-to-center distance between any two adjacent fuel assemblies 5 is 270mm, the outer diameter of the guide tube 6 is 40mm, and the wall thickness 1.0mm. The diameter of the circumscribed circle of the core is 4364mm, and the height of the active zone is 4200mm. The thermal power of the core is 3600MWth, and the volume average power density is 64.4MW / m 3 , the average linear power density is 10.6kW / m.

[0035] In this embodiment, after the coolant enters from the cold end of the pres...

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Abstract

The invention discloses a sleeve type fuel assembly and a supercritical water cooled reactor. The sleeve type fuel assembly sequentially comprises an inner pipe and an outer pipe from inside to outside in the radial direction; an area surrounded by the inner pipe is an inner area; an inner zone fuel rod is arranged in the inner area; an area between the outer pipe and the inner pipe is an outer area; an outer area fuel rod is arranged in the outer area, the upper portion of the outer pipe is of an open structure, the lower portion of the outer pipe is of a closed structure, the two ends of theinner pipe are of open structures; coolant flows in the outer area from top to bottom, and flows in the inner area from bottom to top, and the fuel enrichment degree of the inner area fuel rod is higher than that of the outer area fuel rod. The sleeve type fuel assembly can solve the problem of complication of a fuel assembly and a reactor core structure due to the adoption of a water slowing-down rod and coolant multi-flow design technology in the prior art, and has the advantages of improving the reactor core coolant flow rate, enhancing heat transfer and reducing fuel cladding temperature.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a casing-type fuel assembly and a supercritical water-cooled reactor. Background technique [0002] Supercritical water-cooled reactor (SCWR) is one of the six most promising nuclear energy systems selected by the Generation IV Nuclear Energy International Forum (GIF). In order to improve the thermal efficiency of the system and obtain higher economy, the operating pressure of the system is about 25MPa, and the outlet temperature is above 500°C, which makes the average temperature of the core coolant higher and the density lower, resulting in a thermal safety margin of the core. The amount of fuel is small and high fuel enrichment is required, which significantly affects the technical indicators and market competitiveness of supercritical water-cooled reactors (SCWR). For this reason, the supercritical water-cooled reactor design at home and abroad adopts a relatively c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C3/04G21C15/24
CPCG21C3/04G21C15/24Y02E30/30
Inventor 夏榜样姚磊卢迪王连杰李庆李翔肖鹏甯忠豪李司南
Owner NUCLEAR POWER INSTITUTE OF CHINA
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