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Gadolinium-loaded fuel rods, fuel assemblies with gadolinium-loaded fuel rods, and pressurized water reactor core

A fuel assembly and fuel rod technology, applied in the field of nuclear reactors, can solve the problems of low enrichment, difficulty in realizing the direct application of recycled uranium fuel, expensive maintenance costs, etc., so as to save uranium resources, save the cost of combustible poisons, and meet the requirements of the reactor. The effect of core safety requirements

Active Publication Date: 2017-08-01
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

recycled uranium 235 U enrichment is low (generally no more than 1.5%), it is difficult to realize the direct application of recycled uranium fuel in PWR nuclear power plants with existing technologies, and long-term and safe storage of recycled uranium requires high maintenance costs

Method used

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  • Gadolinium-loaded fuel rods, fuel assemblies with gadolinium-loaded fuel rods, and pressurized water reactor core
  • Gadolinium-loaded fuel rods, fuel assemblies with gadolinium-loaded fuel rods, and pressurized water reactor core
  • Gadolinium-loaded fuel rods, fuel assemblies with gadolinium-loaded fuel rods, and pressurized water reactor core

Examples

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Effect test

Embodiment 1

[0034]Gadolinium loaded fuel rods comprising fuel cores made of recycled uranium oxide and Gd 2 o 3 constituted, the Gd 2 o 3 The mass fraction of recovered uranium oxide is 3%~5%, and the mass fraction of recovered uranium oxide is 95%~97%. 235 The U enrichment degree does not exceed 1.5%.

[0035] Recycled Uranium (RU) is manufactured using spent fuel produced in the nuclear power production of light water reactors (LWR). The uranium separated from spent fuel after chemical reprocessing is called reprocessed or recycled uranium in the industry. Recovered uranium (RU) differs from natural uranium (NU), which contains only three isotopes 234 U 235 U and 238 U. While RU obtained after irradiation and cooling in LWR has different isotopes from natural uranium, specifically, RU includes four additional uranium isotopes not present in natural uranium 236 U 232 U 233 U and 237 U, ie RU including isotopes 234 U 235 U 238 U 236 U 232 U 233 U and 237 U. Recovery of ...

Embodiment 2

[0039] In this embodiment, the fuel assembly with gadolinium-loaded fuel rods includes fuel rods, guide pipes 2, and instrumentation pipes 4. The fuel rods include gadolinium-free fuel rods 1 and recycled uranium-loaded gadolinium fuel rods 3. The recycled uranium The gadolinium-loaded fuel rods 3 are the gadolinium-loaded fuel rods using recycled uranium in Example 1, and the number of the recycled uranium-loaded gadolinium fuel rods 3 is 8, 12, 16, 20 or 24.

[0040] The fuel assembly in this embodiment is used in the core of a pressurized water reactor nuclear power plant.

[0041] The guide tube 2, instrument tube 4, gadolinium-free fuel rods 1 and recycled uranium-loaded gadolinium fuel rods 3 are arranged in a square grid in a square structure:

[0042] The instrumentation tube 4 is arranged in the center of the fuel assembly;

[0043] The guide tubes 2 are arranged in at least two circles around the instrument tube 4 to form at least two guide tube rings, and the adjac...

Embodiment 3

[0051] On the basis of Embodiment 2, this embodiment provides a specific structure of a fuel assembly in which the number of recycled uranium-loaded gadolinium fuel rods 3 is eight.

[0052] Such as figure 1 As shown, the fuel assembly includes 8 recycled uranium-loaded gadolinium fuel rods 3, 24 guide tubes 2, 1 instrument tube 4, 256 gadolinium-free fuel rods 1, 256 gadolinium-free fuel rods 1, 8 recycled uranium Gadolinium-loaded fuel rods 3, guide tubes 2, and instrument tubes 4 are arranged in a square of 17×17, that is, arranged in 17 rows and 17 columns:

[0053] The instrumentation tube 4 is arranged in the center of the fuel assembly;

[0054] The 24 guide pipes 2 are arranged in two circles of guide pipe rings centered on the instrument pipe 4: the inner ring and the outer ring. The inner ring is located on a 7×7 rectangular ring centered on the instrument pipe 4. 8 guide tubes 2; the outer ring is in a circular or rectangular ring shape, 16 guide tubes 2 are rough...

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Abstract

The invention discloses a gadolinium-carrying fuel rod, a fuel assembly having the gadolinium-carrying fuel rod, and a pressurized water reactor core. The fuel core of the gadolinium-loaded fuel rod is composed of recovered uranium oxide and Gd2O3. The mass fraction of Gd2O3 is 3% to 5%, and the mass fraction of recovered uranium oxide is 95% to 97%. A fuel assembly with gadolinium-loaded fuel rods, including fuel rods, guide tubes, and instrumentation tubes. The fuel rods, guide tubes, and instrumentation tubes are arranged in a square structure, and the instrumentation tubes are arranged in the center of the fuel assembly; the fuel rods include gadolinium-free fuel rods and The aforementioned gadolinium-loaded fuel rod. The PWR core employs the aforementioned fuel assemblies with gadolinium-loaded fuel rods to assist in controlling the residual reactivity of the core. The invention uses recycled uranium fuel to make gadolinium-carrying fuel rods and fuel assemblies for the core, meets the safety requirements of the core, and at the same time meets the requirements of the residual reactivity control of the core for solid combustible poisons, effectively saving uranium resources and reducing recycling Uranium storage costs.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a gadolinium-loaded fuel rod, a fuel assembly with the gadolinium-loaded fuel rod, and a pressurized water reactor core. Background technique [0002] The reactivity control of PWR nuclear power plant is realized by soluble boron solution, solid burnable poison and control rod bundle. When the concentration of soluble boron exceeds a certain value, the temperature coefficient of the moderator will become positive. In order to make the reactor have a negative moderator temperature coefficient, it is necessary to limit the concentration of soluble boron, compensate part of the remaining reactivity with solid burnable poison, reduce the critical boron concentration of the core, and pass the fuel partition loading and the reasonable arrangement of burnable poison rods to flatten the radial power distribution of the core. [0003] The burnable poison rods in the first cycle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/02G21C3/58G21C5/12
CPCG21C3/02G21C3/04G21C3/58G21C5/12Y02E30/30
Inventor 王连杰李庆陈长刘启伟巨海涛
Owner NUCLEAR POWER INSTITUTE OF CHINA
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