A kind of uo2 and u3si2 composite fuel pellets and its preparation method and application

A composite fuel and UO2 technology, which is applied in the direction of reactor fuel material, reactor fuel elements, and manufacturing reactors, can solve the problems of nuclear fuel safety reduction and low thermal conductivity, and achieve improved performance, high thermal conductivity, and high melting point. Effect

Active Publication Date: 2018-11-27
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One of purpose of the present invention is to provide a kind of UO for above-mentioned situation 2 and U 3 Si 2 Composite fuel pellets to solve UO in the prior art 2 The problem of low thermal conductivity leading to reduced safety of nuclear fuel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of UO 2 And U 3 Si 2 The preparation method of composite fuel pellets includes the following steps:

[0038] Step 1: The UO with a particle size of 50μm 2 Powder, quality UO 2 8wt.% of powder, silicon powder with particle size of 20μm, mass UO 2 Powder of 6wt.% pore-forming agent ammonium oxalate, quality UO 2 Powder 0.3wt.% of lubricant zinc stearate was mixed for 10 hours to obtain UO 2 Mixture powder.

[0039] Step 2: Press the mixed powder into a density of 6.5g / cm 3 The pre-compacted compact is then crushed into mixture particles with a diameter of 1mm, and then loaded into the spheroidizing equipment, adding the lubricant zinc stearate with a mass of 0.2wt.% of the mixture particles, and performing self-grinding spheroidizing and mixing for 3 hours , Get UO with good sphericity 2 Mixture pellets.

[0040] Step 3: Put UO 2 The mixture pellets are pressed into a density of 6.2g / cm 3 Put the pellets into a high-temperature atmosphere sintering furnace, and carry out ...

Embodiment 2

[0043] A kind of UO 2 And U 3 Si 2 The preparation method of composite fuel pellets includes the following steps:

[0044] Step 1: The UO with a particle size of 200μm 2 Powder, quality UO 2 15wt.% powder, 200μm particle size silicon powder, mass UO 2 Powder 3wt.% of porogen ammonium oxalate, quality UO 2 Powder 0.5wt.% of lubricant zinc stearate was mixed for 6 hours to obtain UO 2 Mixture powder.

[0045] Step 2: Press the mixed powder to a density of 6.2g / cm 3 The pre-compacted compact is then crushed into 0.5mm particle size mixture particles, and then loaded into the spheroidizing equipment, and the lubricant zinc stearate with a mass of 0.5wt.% of the mixture particles is added for self-grinding spheroidizing and mixing 6 Hours, get UO with good sphericity 2 Mixture pellets.

[0046] Step 3: Put UO 2 The mixture pellets are pressed into a density of 6g / cm 3 The pellets are loaded into a high-temperature atmosphere sintering furnace, and low-temperature pre-sintering is carried ...

Embodiment 3

[0049] A kind of UO 2 And U 3 Si 2 The preparation method of composite fuel pellets includes the following steps:

[0050] Step 1: The UO with a particle size of 100nm 2 Powder, quality UO 2 10wt.% powder, 5μm particle size silicon powder, mass UO 2 Powder 0.2wt.% of porogen ammonium oxalate, quality UO 2 Powder 0.2wt.% lubricant zinc stearate was mixed for 24 hours to obtain UO 2 Mixture powder.

[0051] Step 2: Press the mixed powder into a density of 4.5g / cm 3 The pre-compacted compact is then crushed into 2mm particle size mixture particles, and then loaded into the spheroidizing equipment, adding the lubricant zinc stearate with a mass of 0.3wt.% of the mixture particles, and performing self-grinding spheroidizing and mixing for 0.5 hours , Get UO with good sphericity 2 Mixture pellets.

[0052] Step 3: Put UO 2 The mixture pellets are pressed into a density of 5g / cm 3 The pellets are loaded into a high-temperature atmosphere sintering furnace, and low-temperature pre-sintering ...

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Abstract

The invention discloses a UO2 and U3Si2 composite fuel pellet as well as a preparation method and application thereof and aims at solving the problem that the security of nuclear fuel is reduced as UO2 thermal conductivity is too low in the prior art. U3Si2 of the composite fuel pellet is of a three-dimensional network structure and forms an interpenetrating network structure with UO2. According to the invention, a high temperature melting infiltrating reaction method is adopted for preparing and generating the UO2 and U3Si2 composite fuel pellet with the interpenetrating network structure. The invention also discloses application of the UO2 and U3Si2 composite fuel pellet as the nuclear fuel in a commercial nuclear reactor. The UO2 and U3Si2 composite fuel pellet disclosed by the invention can resist a coolant loss accident within a longer time, the performance of the UO2 and U3Si2 composite fuel pellet under normal operating conditions also can be maintained or improved, the preparation method is simple in technology, easy in operation and high in production efficiency, and large-scale industrial production can be realized.

Description

Technical field [0001] The invention belongs to the field of nuclear fuel technology, and specifically relates to a UO 2 And U 3 Si 2 Composite fuel pellets and preparation methods and uses thereof. Background technique [0002] Uranium Dioxide (UO 2 ) Is currently the most widely used nuclear fuel for commercial nuclear reactors. It has excellent thermal, chemical, and radiation stability, as well as high melting point, retention of solid fission products and strong ability to block gaseous fission products from spreading. However, relying on the characteristics of heat transfer by phonons causes its thermal conductivity to drop sharply under high temperature and irradiation conditions, and the heat export ability declines rapidly. Therefore, the current UO 2 The operating temperature of -Zr nuclear fuel system is only 700-1200℃. In the accident state, the reactor cooling system failed, the heat in the reactor could not be dissipated, the temperature of the reactor core increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/62G21C3/64G21C21/02G21C21/10
CPCG21C3/623G21C3/64G21C21/02G21C21/10Y02E30/30
Inventor 杨振亮李冰清高瑞贾建平唐浩刘徐徐钟毅段丽美黄奇奇王志毅
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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