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Method for preparing annular UO2 fuel pellet

A technology for fuel pellets and UO2, which is applied in the field of preparation of annular UO2 fuel pellets, can solve problems such as no fuel-related reports and the like, and achieve the effect of uniform density

Active Publication Date: 2010-06-16
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After searching, there is no preparation of cyclic UO 2 News about fuel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Add 10g of acrylamide, 0.5g of subunit bisacrylamide, and 1g of ammonium polyacrylate in 100ml of deionized water to prepare a premix, wherein the weight ratio of acrylamide to subunit bisacrylamide is 20:1;

[0017] 2. Add 500gAl to the ball mill 2 o 3 Grinding balls, 800g U 3 o 8 Powder, the prepared premix solution was added to the ball mill to disperse for 3 hours, and the slurry was mixed with Al 2 o 3 Separation of spheres to prepare U 3 o 8 slurry;

[0018] 3. At U 3 o 8 Add 0.5ml of ammonium persulfate and 0.1ml of tetramethylethylenediamine to the slurry, and mix well;

[0019] 4. Pour the uniformly mixed slurry into the forming mold, and let it stand at room temperature for 20 minutes. The slurry is completely solidified, and the mold is removed to obtain a ring-shaped U 3 o 8 green body.

[0020] 5. Insert the ring type U 3 o 8 The green body is dried for 24 hours in an environment with a temperature of 60°C and a humidity of 80%, and debonde...

Embodiment 2

[0023] 1. Add 10g of acrylamide, 0.25g of subunit bisacrylamide, and 3g of ammonium polyacrylate into 100ml of deionized water to prepare a premix, wherein the weight ratio of acrylamide to subunit bisacrylamide is 40:1;

[0024] 2. Add 500gAl to the ball mill 2 o 3 Grinding balls, 600g U 3 o 8 Powder, the prepared premix solution was added to the ball mill to disperse for 4 hours, and the slurry was mixed with Al 2 o 3 Separation of spheres to prepare U 3 o 8 slurry;

[0025] 3. At U 3 o 8 Add 2ml of ammonium persulfate and 0.5ml of tetramethylethylenediamine to the slurry, and mix well;

[0026] 4. Pour the uniformly mixed slurry into the forming mold, and let it stand at room temperature for 40 minutes. After the slurry is completely solidified, remove the mold to obtain a ring-shaped U 3 o 8 green body.

[0027] 5. Ring U 3 o 8 The green body is dried at a temperature of 70°C and a humidity of 90% for 24 hours, and debonded at a temperature below 600°C for 3....

Embodiment 3

[0030] 1. Add 12g of acrylamide, 0.2g of subunit bisacrylamide, and 5g of ammonium polyacrylate into 100ml of deionized water to prepare a premix, wherein the weight ratio of acrylamide to subunit bisacrylamide is 60:1;

[0031] 2. Add 500gAl to the ball mill 2 o 3 Grinding balls, 600g U 3 o 8 Powder, the prepared premix solution was added to the ball mill to disperse for 6 hours, and the slurry was mixed with Al 2 o 3 Separation of spheres to prepare U 3 o 8 slurry;

[0032] 3. At U 3 o 8 Add 3ml of ammonium persulfate and 1ml of tetramethylethylenediamine to the slurry, and mix well;

[0033] 4. Pour the uniformly mixed slurry into the forming mold, and let it stand at room temperature for 60 minutes. After the slurry is completely solidified, remove the mold to obtain a ring-shaped U 3 o 8 green body.

[0034] 5. Ring U 3 o 8 The green body is dried for 24 hours in an environment with a temperature of 80°C and a humidity of 95%, and debonded for 4 hours at a t...

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Abstract

The invention discloses a method for preparing a nuclear fuel, which comprises the following steps: mixing acrylic amide, subunit bisacrylamide, ammonium polyacrylate and deionized water to form premix solution; adding U3O8 powder into a ball mill, then adding the premix solution into the ball mill, and preparing U3O8 slurry of which the solid-phase content is more than or equal to 60vol percent and the viscosity is less than or equal to 1Pa.s through ball-milling dispersion; adding ammonium sulfate and tetramethyl ethylene diamine into the slurry, evenly mixing the slurry and then injecting the slurry into a die, solidifying the slurry, and removing the die to obtain an annular U3O8 raw blank; drying the raw blank at the temperature of between 60 and 80 DEG C and the humidity of between 80 and 95 percent, and un-sticking the raw blank at the temperature of 600 + / - 20 DEG C; and sintering the un-stuck annular U3O8 raw blank in the hydrogen atmosphere at the temperature of 1,730 + / - 10 DEG C to obtain an annular UO2 fuel pellet. The method has the advantages that the relative density of the primary pellet blank reaches 60%-70%, the breaking strength is over 20MPa, and the size-grinding machining allowance of a sintered body is minimized through mechanical machining and precise size control.

Description

technical field [0001] The invention belongs to a preparation method of nuclear fuel, in particular to a ring-type UO 2 Method for preparing fuel pellets. Background technique [0002] At present, the vast majority of nuclear reactors in the world use UO 2 Fuel power generation, the early fuel used solid UO 2 ; In order to reduce the overall cost of generating electricity in nuclear power plants, one way to improve the economics of operating plants is to increase their power density. UO 2 The conversion of the fuel from the solid type to the ring type has several significant implications for increasing the power density: 1. The use of annular pellets reduces the temperature of the fuel, reduces the differential thermal expansion between the fuel and the cladding, and reduces the ring ridge of the pellets High; 2. Reduced swelling caused by fission products, thereby reducing the interaction between fuel pellets and cladding (PCI effect), the use of annular pellets reduces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C21/02
CPCY02E30/30
Inventor 许奎杨忠波杨勇飞王晓敏左国平代胜平杨静江涛徐威
Owner NUCLEAR POWER INSTITUTE OF CHINA
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