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Preparation method of UC fuel pellet

A technology of fuel pellets and compression molding, which is applied in the manufacture of reactors, reactors, and reduction of greenhouse gases, etc., can solve the problems of inability to prepare pure UC single-phase fuel, cracking, etc., and achieve the effect of designable composition and controllable experimental process

Inactive Publication Date: 2019-06-18
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When preparing UC fuel by this method, in order to make UO 2 Fully react with carbon powder, generally need excessive carbon powder to convert UO 2 The oxygen in the uranium carbide fuel is completely removed, but due to the presence of UC and U in the uranium carbide fuel 2 C 3 and UC 2 Three different phase structures, excessive carbon powder will lead to impurity phase (U 2 C 3 or UC 2 ) makes it impossible to prepare high-purity UC single-phase fuel, and the existence of different phases will cause UC fuel to crack when the temperature changes, so a technological breakthrough is required to prepare high-purity UC fuel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Preparation and detection of UC fuel pellets (1)

[0024] (1) Preparation of ultrafine metal uranium powder

[0025] Put the metal uranium block into the hydrogenation furnace, feed high-purity hydrogen (purity 99.90%), maintain the air pressure at 0.1MPa, raise the temperature to 500°C, keep it for 5 hours, and then lower it to room temperature to obtain uranium hydride powder. Stop feeding hydrogen, and evacuate the air pressure in the hydrogenation furnace to 1×10 -1 Pa, raise the temperature to 400°C, keep it warm for 6 hours, and then lower it to room temperature to obtain metal uranium powder. In order to refine the metal uranium powder, repeat the above operation 4 times.

[0026] (2) Metal uranium powder and ultra-fine carbon powder high-energy ball milling

[0027] The prepared metal uranium powder and superfine carbon powder (average particle size is 100nm) are weighed according to the molar ratio of 1:1, and then the mixture is put into a high-e...

Embodiment 2

[0034] Example 2: Preparation and detection of UC fuel pellets (2)

[0035] (1) Preparation of ultrafine metal uranium powder

[0036] Put the metal uranium block into the hydrogenation furnace, feed high-purity hydrogen (purity 99.95%), maintain the air pressure at 0.15MPa, raise the temperature to 550°C, keep it for 4 hours, and then lower it to room temperature to obtain uranium hydride powder. Stop feeding hydrogen, and evacuate the air pressure in the hydrogenation furnace to 5×10 -2 pa, the temperature was raised to 450°C, and after 5 hours of heat preservation, the temperature was lowered to room temperature to obtain metal uranium powder. In order to refine the metal uranium powder, repeat the above operation 5 times.

[0037] (2) Metal uranium powder and ultra-fine carbon powder high-energy ball milling

[0038] The prepared metal uranium powder and ultrafine carbon powder (average particle size is 200nm) are weighed according to the molar ratio of 1.05:1, and then...

Embodiment 3

[0045] Example 3: Preparation and detection of UC fuel pellets (3)

[0046] (1) Preparation of ultrafine metal uranium powder

[0047] Put the metal uranium block into the hydrogenation furnace, feed high-purity hydrogen (purity 99.99%), maintain the air pressure at 0.2MPa, raise the temperature to 600°C, keep it warm for 3 hours, and then lower it to room temperature to obtain uranium hydride powder. Stop feeding hydrogen, and evacuate the air pressure in the hydrogenation furnace to 1×10 -2 pa, the temperature was raised to 500°C, and after 4 hours of heat preservation, the temperature was lowered to room temperature to obtain metal uranium powder. In order to refine the metal uranium powder, repeat the above operation 6 times.

[0048] (2) Metal uranium powder and ultra-fine carbon powder high-energy ball milling

[0049] The prepared metal uranium powder and superfine carbon powder (average particle size is 300nm) are weighed and proportioned according to the molar ratio ...

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Abstract

The invention belongs to the technical field of nuclear fuel preparation, and relates to a preparation method of a UC fuel pellet. The preparation method comprises following steps: (1) preparing ultrafine uranium powder; (2) mixing uranium powder and ultrafine carbon powder; (3) synthesizing UC powder at a high temperature; (4) pressing UC powder; and (5) sintering a UC fuel pellet blank. The provided preparation method can prepare a high purity UC fuel.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel preparation and relates to a method for preparing UC fuel pellets. Background technique [0002] Generally speaking, ceramic nuclear fuel mainly includes UO 2 , UC and UN fuels, among which the ceramic nuclear fuel commonly used in pressurized water reactor nuclear power plants is UO 2 Fuel, while UC and UN fuels are generally used in special reactors. As UC fuels with UO 2 Compared with UC fuel, it has a higher melting point, better thermal conductivity and stronger neutron radiation resistance, so UC fuel is suitable for use as a fuel for space nuclear power reactor cores with harsher conditions than ordinary nuclear power plants. [0003] The conventional preparation method of UC fuel is: UO 2 The powder is mixed with carbon powder, processed by high temperature reaction, and then prepared by ball milling, pressing and sintering. [0004] When preparing UC fuel by this method, in orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C21/02
CPCY02E30/30
Inventor 吴学志尹邦跃
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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