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Manufacturing method of high-uranium density-coated fuel particles, inert-based dispersed fuel pellets and integrated fuel rods, and manufacturing method thereof

A technology of coating fuel particles and manufacturing methods, which is applied in the direction of manufacturing reactors, reactor fuel materials, and reducing greenhouse gases, etc., can solve problems such as high cost, impossibility of chemical methods, and waste liquid pollution, so as to reduce preparation costs and improve uranium packaging. Quantity, the effect of improving economy

Active Publication Date: 2021-03-16
CHINA NUCLEAR POWER TECH RES INST CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the preparation of UxSiy core, it is not easy to find a suitable molten precursor solution, so it is impossible to use chemical methods to prepare UxSiy fuel core
In addition, the chemical method is not easy to produce on a large scale, the cost is high and there is a small amount of waste liquid pollution

Method used

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  • Manufacturing method of high-uranium density-coated fuel particles, inert-based dispersed fuel pellets and integrated fuel rods, and manufacturing method thereof
  • Manufacturing method of high-uranium density-coated fuel particles, inert-based dispersed fuel pellets and integrated fuel rods, and manufacturing method thereof
  • Manufacturing method of high-uranium density-coated fuel particles, inert-based dispersed fuel pellets and integrated fuel rods, and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Obtain high-purity U through powder separation 3 Si 2 powder.

[0106] Weigh a certain amount of U 3 Si 2 The powder is mixed with 2-5 wt.% binder to form a viscous mass. Extrude the viscous material from the pores with a fine hole extrusion die to form a short column with a length of 700±50nm. Use a sintering furnace to pre-fire the short cylinder. The pre-fire temperature is 400°C-600°C. After 3-5 hours of heat preservation, the temperature is lowered with the furnace. The size shrinkage of the pellets was not obvious. Place the pre-burned short cylinder in a ball mill, turn the lower turntable, and grind at a speed of 50r / min for 10-12 hours to form pellets. The pellets after grinding are taken out for cleaning and screening, and the pellets with a size of 600±50nm are screened out. Sieve out the qualified pellets for sintering, use the atmosphere sintering furnace, pass H 2 atmosphere, the sintering temperature is 1300°C-1500°C, the diameter of the sintered ...

Embodiment 2

[0111] Obtain high-purity U through powder separation 3 Si 2 powder.

[0112] Weigh a certain amount of U 3 Si 2 The powder is mixed with 2-5 wt.% binder to form a viscous mass. Extrude the viscous material from the pores with a pore extrusion die to form short columns with a length of 600-700nm. Use a sintering furnace to pre-fire the short cylinder. The pre-fire temperature is 500±50°C. After holding for 2-5 hours, the temperature is lowered with the furnace. The density of the pre-fired short cylinder is 80% T.D. Ball size shrinkage was not apparent. Place the pre-fired short cylinder in a ball mill, turn the lower turntable, and grind at a speed of 50±10r / min for 8-16 hours to form small balls. The pellets after grinding are taken out for cleaning and screening, and the pellets with a size of 600±50nm are screened out. Sieve out the qualified pellets for sintering, use the atmosphere sintering furnace, pass H 2 atmosphere, the sintering temperature is 1300°C-1500°C...

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Abstract

A manufacturing method of high-uranium-density coated fuel particles, an inert matrix dispersion fuel pellet, an integrated fuel rod and a manufacturing method thereof are disclosed. The manufacturingmethod of high-uranium-density coated fuel particles includes S1) preparing mixture powder of U-Si compound by adopting a smelting manner; S2) separating powder in the mixture powder by centrifugal separation according to differences in density of different types of powder in the mixture powder; S3) mixing the separated U3Si2 powder with an adhesive to prepare spherical cores with smooth surfaces; S4) forming multi-layer coatings on the cores through sequential deposition in a vapor deposition method to form the high-uranium-density coated fuel particles. The smelting manner and powder centrifugal separation are combined to obtain high-purity UxSiy powder to achieve continuous production. A powder metallurgic method in place of a sol-gel method is adopted to prepare the cores of the coated fuel particles, thus reducing pollution generated by chemical waste liquid, simplifying operation, reducing the preparation cost and improving the economical efficiency.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel, in particular to a method for manufacturing fuel particles coated with high uranium density, an inert matrix dispersed fuel pellet and a manufacturing method thereof, an integrated fuel rod and a manufacturing method thereof. Background technique [0002] The development of high-temperature gas-cooled reactors has a mature and close relationship with the successful research and development of coated fuel particles. There is a spherical UO in the coated fuel particles produced industrially 2 The core is wrapped with 4 layers of closed spherical shells by vapor deposition technology, which are loose buffer layer, dense barrier layer, structural support sealing layer, and dense barrier layer (TRISO particles, or BISO particles if there are only two layers). The main function of these layers of materials is to confine fissile materials and block the release of fission products. [0003] In the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C3/60G21C21/00G21C21/10
CPCG21C3/60G21C21/00G21C21/10Y02E30/30
Inventor 马赵丹丹李锐黄华伟刘彤高思宇张显生廖业宏任啟森张强
Owner CHINA NUCLEAR POWER TECH RES INST CO LTD
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