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A kind of preparation method of uranium nitride pellet

A technology of uranium nitride core and diuranium trinitride, which is applied in the field of nuclear fuel pellet preparation, can solve the problems of low pellet density, unguaranteed purity, narrow application range, etc., and achieves reduced release, good surface appearance, and improved The effect of power density

Active Publication Date: 2019-08-13
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the purity of the UN pellets obtained by the current existing preparation methods cannot be guaranteed, and at the same time, the pellets have low density, narrow application range, and many defects.

Method used

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Examples

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preparation example Construction

[0034] A method for preparing uranium nitride pellets, comprising the following steps:

[0035] Step 1, hydrogenation-dehydrogenation sample preparation.

[0036] Step 1.1, turning the uranium block into metal sheets, so as to have a higher contact area with hydrogen during hydrogenation;

[0037] In step 1.2, first soak the uranium slice in nitric acid to remove the surface oxide film, and then wash it with absolute ethanol to remove the residual acid solution on the surface of the uranium slice.

[0038] Step 2, hydrogenation-dehydrogenation to prepare uranium powder.

[0039] Step 2.1, put the cleaned uranium slices into the hydrogenation-dehydrogenation reactor, pass 0.13-0.17MPa hydrogen gas with a purity of 99.99% into the hydrogenation-dehydrogenation reactor, raise the temperature to 230-280°C, and start Hydrogenation reaction, the hydrogenation reaction time is 3 to 5 hours;

[0040] Step 2.2, after the hydrogenation reaction is completed, the temperature is raised...

Embodiment 1

[0051] A method for preparing uranium nitride pellets, comprising the following steps:

[0052] Step 1, hydrogenation-dehydrogenation sample preparation.

[0053] Step 1.1, turning the uranium block into a metal sheet with a thickness of 2mm;

[0054] In step 1.2, first soak the uranium slice in nitric acid to remove the surface oxide film, and then wash it with absolute ethanol for 3 times to remove the residual acid solution on the surface of the uranium slice.

[0055] Step 2, hydrogenation-dehydrogenation to prepare uranium powder.

[0056] Step 2.1, put the cleaned uranium slices into the hydrogenation-dehydrogenation reactor, feed 0.06MPa hydrogen gas with a purity of 99.99% into the hydrogenation-dehydrogenation reactor, raise the temperature to 260°C, and start the hydrogenation reaction. The reaction time is 5h;

[0057] Step 2.2, after the hydrogenation reaction is completed, the temperature is raised to 600°C, and the dehydrogenation reaction is carried out, and ...

Embodiment 2

[0067] A method for preparing uranium nitride pellets, comprising the following steps:

[0068] Step 1, hydrogenation-dehydrogenation sample preparation.

[0069] Step 1.1, turning the uranium block into a metal sheet with a thickness of 1.5mm;

[0070] In step 1.2, first soak the uranium slice in nitric acid to remove the surface oxide film, and then wash it with absolute ethanol for 5 times to remove the residual acid solution on the surface of the uranium slice.

[0071] Step 2, hydrogenation-dehydrogenation to prepare uranium powder.

[0072] Step 2.1, put the cleaned uranium slices into the hydrogenation-dehydrogenation reactor, pass 0.05MPa hydrogen gas with a purity of 99.99% into the hydrogenation-dehydrogenation reactor, raise the temperature to 255°C, start the hydrogenation reaction, hydrogenation The reaction time is 3h;

[0073] Step 2.2, after the hydrogenation reaction is completed, the temperature is raised to 540°C, and the dehydrogenation reaction is carri...

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Abstract

The invention relates to the technical field of preparation of nuclear fuel pellets, and particularly discloses to a method for preparing a uranium nitride pellet. The method comprises the following steps: 1, preparing a hydrogenation-dehydrogenation sample; 2, performing hydrogenation-dehydrogenation to prepare uranium powder; 3, preparing uranium sesquinitride powder; 4, molding a uranium sesquinitride green body; step 5, sintering the green body to form the uranium nitride pellet. The uranium nitride pellet obtained by the method has good surface appearance, and the density and the chemicalcomposition of the pellet meet the requirements of technical indexes, so the pellet can be used in a novel nuclear reactor to improve the core power density and reduce the release of fission products.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel pellet preparation, and in particular relates to a method for preparing uranium nitride pellets. Background technique [0002] Uranium nitride fuel has many excellent properties such as high thermal conductivity, high uranium density, high melting point, hard neutron spectrum, low thermal expansion coefficient, good radiation stability, low fission gas release rate, and good compatibility with liquid metals. , has become one of the fuels of choice for future space reactor power, space nuclear power, and nuclear-powered rockets. For example, in the Advanced LMFBR program in the United States, the (U·Pu)N fuel was irradiated by the EBR-Ⅱ experimental fast reactor. After 1984, the United States used UN fuel after full-time design of space nuclear power sources and nuclear power propulsion such as SPR-6, SP-100, SAFE, HOMER, and Prome-theus. At the same time, uranium nitride fuel is also one of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/58C04B35/58C04B35/645C04B35/622
CPCC04B35/58C04B35/622C04B35/645C04B2235/6581G21C3/58Y02E30/30
Inventor 刘文涛周续李宗书董秋实孟莹王兆松
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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