Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing 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 narrow application range, low density of pellets, and unguaranteed purity, so as to reduce release, increase power density, and surface good looking effect

Active Publication Date: 2018-07-20
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
View PDF8 Cites 5 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] A preparation method of uranium nitride pellets includes the following steps:

[0035] Step 1. Hydrogenation-dehydrogenation sample preparation.

[0036] Step 1.1, carve the uranium block into metal flakes to facilitate a higher contact area with hydrogen during hydrogenation;

[0037] Step 1.2, first immerse the uranium sheet in nitric acid to remove the surface oxide film, and then clean it with absolute ethanol to remove the residual acid on the surface of the uranium sheet.

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

[0039] Step 2.1: Put the cleaned uranium flakes into the hydrogenation-dehydrogenation reaction kettle, and pass 0.13-0.17MPa hydrogen with a purity of 99.99% into the hydrogenation-dehydrogenation reaction kettle. The temperature is raised to 230-280°C and start Hydrogenation reaction, the hydrogenation reaction time is 3~5h;

[0040] Step 2.2: After the hydrogenation reaction is over, the temperature is increased to 540~600℃, and...

Embodiment 1

[0051] A preparation method of uranium nitride pellets includes the following steps:

[0052] Step 1. Hydrogenation-dehydrogenation sample preparation.

[0053] Step 1.1, carve the uranium block into a 2mm thick metal sheet;

[0054] Step 1.2, first immerse the uranium sheet in nitric acid to remove the surface oxide film, and then wash it with absolute ethanol three times to remove the residual acid on the surface of the uranium sheet.

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

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

[0057] Step 2.2: After the hydrogenation reaction is completed, the temperature is increased to 600° C., and the dehydrogenation reaction is performed. The dehydrogenation reaction time is 5 ...

Embodiment 2

[0067] A preparation method of uranium nitride pellets includes the following steps:

[0068] Step 1. Hydrogenation-dehydrogenation sample preparation.

[0069] Step 1.1, carve the uranium block into a 1.5mm thick metal sheet;

[0070] Step 1.2, first immerse the uranium sheet in nitric acid to remove the surface oxide film, and then wash it with absolute ethanol 5 times to remove the residual acid on the surface of the uranium sheet.

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

[0072] Step 2.1, put the cleaned uranium flakes into the hydrogenation-dehydrogenation reaction kettle, and pour 0.05MPa hydrogen with a purity of 99.99% into the hydrogenation-dehydrogenation reaction kettle. The temperature is raised to 255°C to start the hydrogenation reaction. The reaction time is 3h;

[0073] Step 2.2: After the hydrogenation reaction is completed, the temperature is increased to 540°C, and the dehydrogenation reaction is carried out. The dehydrogenation react...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

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 specifically relates to a method for preparing uranium nitride pellets. Background technique [0002] Uranium nitride fuel has many excellent properties due to its 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 preferred fuels for future space reactor power, space nuclear power, and nuclear-powered rockets. For example, in the Advanced LMFBR program, the United States used the EBR-Ⅱ experimental fast reactor to irradiate (U·Pu)N fuel. After 1984, the United States used UN fuel after the full-time design of space nuclear power sources and nuclear power propulsion such as SPR-6, SP-100, SAFE, HOMER, Prome-theus. At the same time, uranium nitride fuel is also one of the import...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com