Inertia-based dispersion pellet fuel and preparation method and application thereof

An inert and pellet technology, which is applied in the direction of fuel elements, climate sustainability, and reduction of greenhouse gases, can solve the problems of difficult mass production and long sintering cycle, so as to achieve industrial mass production and improve preparation and production efficiency , the effect of good nuclear radiation resistance performance

Active Publication Date: 2017-07-25
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sintering cycle of the hot pressing sintering meth...

Method used

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  • Inertia-based dispersion pellet fuel and preparation method and application thereof
  • Inertia-based dispersion pellet fuel and preparation method and application thereof

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preparation example Construction

[0035] like figure 2 Shown, the preparation method of a kind of inert matrix dispersed pellet fuel of the present invention comprises the following steps:

[0036] Step 1: Prepare SiC mixed slurry and SiC mixed powder;

[0037] Step 2: Coating the SiC mixed slurry on the TRISO particles by spray deposition method;

[0038] Step 3: Molding the SiC-coated TRISO particles to obtain the fuel zone green body;

[0039] Step 4: Compressing the SiC mixed powder to obtain a green body with no fuel area;

[0040] Step 5: Composite pressing the green body in the fuel area and the green body in the non-fuel area to form an IMDP green body;

[0041] Step 6: Sintering the IMDP biscuit in a vacuum furnace without pressure;

[0042] Step 7: Add the sinter to the final size pellet fuel.

[0043] The sum of the total mass percentages of the SiC mixed slurry is calculated as 100%, including the following components: 80-96wt.% SiC, 1-8wt.% Y 2 o 3 , 1-10wt.% Al 2 o 3 , 0-8wt.% SiO 2 an...

Embodiment 1

[0052] Step 1: Weigh each powder according to the following specifications and proportions: SiC, 10nm, 80wt.%; Y 2 o 3 , 20nm, 8wt.%; Al 2 o 3 , 10nm, 10wt.%; polyethyleneimine, molecular weight 800, 2wt.%. Mix the above powder with an equal amount of alcohol, put it into a nylon ball mill jar, use zirconia balls as the grinding balls, and have a ball-to-material ratio of 3:1, and mill for 24 hours to obtain SiC slurry. The slurry was divided into equal parts, one part was used to coat TRISO particles; the other part was dried at 80°C for 24 hours, and SiC mixed powder was obtained after sieving.

[0053] Step 2: Coating the SiC mixed slurry on the TRISO particles by spray deposition method. The TRISO pellets were rolled on a shaker and subjected to a temperature of 70°C. The SiC slurry prepared in step 1 is used to form a mist slurry through a spray generator, and the SiC powder is deposited on the surface of the TRISO particles. By adjusting the angle of the spray gene...

Embodiment 2

[0060] Step: 1: Weigh each powder according to the following specifications and ratios: SiC, 50 μm, 96wt.%; Y 2 o 3 , 20μm, 1wt.%; Al 2 o 3 , 30μm, 1wt.%; SiO 2 , 10nm, 1wt.%; polyethyleneimine, molecular weight 1800, 1wt.%. Mix the above powder with twice the mass of alcohol, put it into a nylon ball mill jar, use alumina balls for the grinding balls, the ball-to-material ratio is 3:1, and mill for 24 hours to obtain SiC slurry. The slurry was divided into equal parts, one part was used to coat TRISO particles; the other part was dried at 80°C for 24 hours, and SiC mixed powder was obtained after sieving.

[0061] Step 2: Coating the SiC mixed slurry on the TRISO particles by spray deposition method. The TRISO pellets were rolled on a shaker and subjected to a temperature of 100°C. The SiC slurry prepared in step 1 is used to form a mist slurry through a spray generator, and the SiC powder is deposited on the surface of the TRISO particles. By adjusting the angle of th...

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Abstract

The invention discloses an inertia-based dispersion pellet fuel and a preparation method and application thereof, which solve the problems of poor anti-radiation property, containment of fission gas and heat conductivity, and difficulty in realizing of large-batch industrialized production in the prior art. The pellet fuel comprises a fuel area and a fuel-free area protecting layer, wherein the fuel-free area protecting layer wraps the periphery of the fuel area. The preparation method comprises the following steps of coating the surface of a TRISO particle with SiC by a spraying and depositing method, and uniformly distributing the pressed TRISO particles into a fuel core blank in an inertia substrate; preparing a SiC fuel-free area blank by die pressing, and combining and pressing the fuel-free area blank and the fuel core blank; finally, performing non-pressure sintering on the combined and pressed fuel core and the protecting layer blank at high temperature, and machining a sintering blank, so as to obtain a fuel assembly of a water reactor and a melting salt reactor in a nuclear reactor. The IMDP has the characteristics that the anti-radiation property is excellent, the containment of the fission gas is good, and the heat conductivity is high.

Description

technical field [0001] The invention relates to an inert base dispersed pellet fuel and its preparation method and application. Background technique [0002] Nuclear power is safe, reliable, low-carbon and clean, and will be an important part of the future global energy structure. At present, countries around the world are actively promoting the construction of nuclear power, so as to alleviate the energy crisis and improve the climate and environment. After the "311" nuclear accident in Fukushima, Japan, the traditional UO 2 The potential safety hazards exposed by +Zr alloy fuel assemblies in the accident state have aroused strong attention from various countries. Improving traditional fuel assemblies and enhancing the safety of nuclear fuel under accident conditions has become a worldwide research hotspot. In this context, the concept of Accident Tolerant Fuel (ATF) came into being. ATF is a new-generation fuel concept proposed to improve the performance of fuel elemen...

Claims

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Application Information

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IPC IPC(8): G21C3/02
CPCG21C3/02Y02E30/30
Inventor 李冰清杨振亮高瑞贾建平刘彤黄华伟孙茂州马赵丹丹
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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