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A kind of preparation device and preparation method of nuclear fuel pellets

A technology for preparing devices and nuclear fuels, which is applied to devices for transforming chemical elements by radiation, nuclear engineering, radioactive purification, etc., to achieve the effects of automation, remote control, and simple operation

Active Publication Date: 2019-07-26
INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of dropping into silicone oil to form balls leads to the generation of secondary radioactive waste liquid, and the silicone oil needs to be treated again

Method used

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  • A kind of preparation device and preparation method of nuclear fuel pellets
  • A kind of preparation device and preparation method of nuclear fuel pellets
  • A kind of preparation device and preparation method of nuclear fuel pellets

Examples

Experimental program
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Effect test

preparation example Construction

[0047] The method for preparing nuclear fuel pellets by the device for preparing nuclear fuel pellets comprises the following steps:

[0048] (1) Turn on the microwave signal source 31, the power amplifier 32, the forward power meter 36 and the reverse power meter 37.

[0049] (2) Turn on the HPLC pump Ⅰ11 and HPLC pump Ⅱ12; input the nuclide metal nitrate solution and gel solution through the HPLC pump Ⅰ11 and HPLC pump Ⅱ12 to transport the nuclide solution respectively Pipe 13 and gelling agent solution delivery pipe 14; after the two raw material liquids meet and mix in the T-shaped raw material liquid mixer 15, the resulting mixed solution continues to flow into the capillary 16.

[0050] Due to the small dead volume of the T-type raw material liquid mixer 15 and the capillary 16 pipeline (about 100 μL), the residence time of the mixed material liquid in the pipeline is very short (on the order of milliseconds), and usually, Even at normal temperature, the mixed material ...

Embodiment 1

[0057] Example 1 The instant-sol-gel method of mixing without cooling and microwave-assisted heating is used to prepare ceramic ceria pellets in a glove box, including the following steps:

[0058] ⑴Ceric ammonium nitrate solution (Ce concentration is 1.65mol / L, OH - / C 4+ = 0.8) and gelling agent solution (3.18mol / L) were transported to the T-type raw material liquid mixer at the flow rate of 2.19 mL / min and 1.41mL / min respectively, and were fully mixed in the 0.15mm capillary tube, and the mixed material Liquid (HMTA / Ce = 3) is dispersed into mixed droplets after being excited by an exciter (excitation frequency 10 Hz).

[0059] (2) Droplets pass through the microwave heating system to form gel balls. The microwave frequency is 12.433 GHz and the input power is 50dBm.

[0060] (3) The gel balls were collected and aged in 0.5 mol / L ammonia solution for 0.5 hours.

[0061] (4) The aged gel balls were hydrothermally treated at 200 °C for 3 hours.

[0062] (5) The hydrotherm...

Embodiment 2

[0064] Example 2 The instant-sol-gel method of mixing without cooling and microwave-assisted heating is used to prepare ceria pellets in a glove box, including the following steps:

[0065] ⑴Ceric ammonium nitrate solution (Ce concentration is 1.65mol / L, OH - / C 4+ = 0.6) and gelling agent solution (3.18mol / L) were transported to the T-type raw material liquid mixer at the flow rate of 2.3 mL / min and 1.3 mL / min, and were fully mixed in the 0.25mm capillary tube, and the mixed material Liquid (HMTA / Ce = 3.4) is dispersed into mixed droplets after being excited by a vibrator (excitation frequency 10 Hz).

[0066] (2) Droplets pass through the microwave heating system to form gel balls. The microwave frequency is 12.433 GHz and the input power is 50dBm.

[0067] (3) The gel balls were collected and aged in 0.5 mol / L ammonia solution for 0.5 hours.

[0068] (4) The aged gel balls were hydrothermally treated at 200 °C for 3 hours.

[0069] (5) The hydrothermally treated pellets...

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Abstract

The invention relates to a nuclear fuel pellet preparation device. The device comprises a raw material liquid mixing system, a liquid drop formation system, a heating system and a post-processing system. The raw material liquid mixing system comprises a high performance liquid chromatography pump I connected with a nitrate solution of metal nuclides, a high performance liquid chromatography pump II connected with a gel solution and a T-shaped raw material liquid mixer. The output ends of the high performance liquid chromatography pump I and the high performance liquid chromatography pump II are connected with a nuclide solution delivery pipe and a gel solution delivery pipe respectively. The nuclide solution delivery pipe and the gel solution delivery pipe are connected with horizontal ports of the T-shaped raw material liquid mixer respectively; a vertical port of the T-shaped raw material liquid mixer is connected with a capillary tube; and the tail end of the capillary tube is connected with the liquid drop formation system. The heating system is arranged under the liquid drop formation system. The post-processing system is arranged under the heating system. Meanwhile, the invention also discloses a method for preparing a nuclear fuel pellet through the device. The method and device can realize instant mixing without cooling at a normal temperature, thereby reducing radiation dose of operation personnel.

Description

technical field [0001] The invention relates to the technical field of regenerative nuclear fuel, in particular to a preparation device and method for nuclear fuel pellets. Background technique [0002] Facing the dual pressure of rapid economic development and environmental protection, vigorously developing nuclear energy has become an important strategy to ensure my country's energy demand and clean security. However, since my country's uranium resource reserves are not very rich, in order to maintain the sustainable development of nuclear energy, it is necessary to develop a closed nuclear fuel cycle accordingly. Among them, the recycling of spent fuel is the core link of the closed nuclear fuel cycle. It can improve the utilization rate of fuel, minimize radioactive waste, and properly solve the problem of high-level radioactive waste treatment and disposal. Therefore, it is a key factor to ensure the sustainable development of nuclear energy. Taking the spent fuel unlo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21G5/00G21F9/30
CPCG21F9/30G21G5/00
Inventor 田伟秦芝曼努埃尔亚历山大普冲
Owner INST OF MODERN PHYSICS CHINESE ACADEMY OF SCI