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Method for producing high temperature reactor fuel element UO* nuclear core

A fuel element and high temperature reactor technology, which is applied in the fields of reactor fuel materials, manufacturing reactors, nuclear engineering, etc., can solve the problems of unsuitability for large-scale production, large number of equipment, and high cost, and achieves reduction of cooling and heating processes and reduction of distribution processes. , the effect of reducing the production cycle

Active Publication Date: 2008-05-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In my country's 10 MW high temperature gas-cooled reactor fuel element production process, since three furnaces are used to independently complete roasting, reduction and sintering, the number of equipment is large; UO 2 It takes 168 hours for microspheres to complete from roasting, reduction to sintering, which is a long cycle and high cost, which is not suitable for large-scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of High Temperature Reactor Fuel Element UO 2 The method of kernel, this method comprises the following steps:

[0028] 1. Dry microspheres containing 5KgU are laid on a circular stainless steel tray through a distributor, and the laying thickness is 1mm. The tray is placed in the bell-type low-temperature sintering furnace through the charging system.

[0029] 2. Turn on the cooling water and compressed air system, and adjust the air flow to 100ml / min. Start the heating power supply, and the temperature rise system is as follows: from room temperature to 300°C at a rate of 1°C / min, then to 450°C at 5°C / min, and keep warm for 2 hours.

[0030] 3. Turn off the compressed air, evacuate for 10 minutes, pass in Ar to wash the furnace for 40 minutes, and pass in Ar+4%H 2 , the gas flow rate is 5ml / min. The heating rate between 450 and 600°C is 6°C / min, and the temperature is kept at 600°C for 1.5 hours; the heating power is turned off, and the low temperature...

Embodiment 2

[0036] Preparation of High Temperature Reactor Fuel Element UO 2 The method of kernel, this method comprises the following steps:

[0037] 1. The dry microspheres containing 7KgU are laid on a circular stainless steel tray through a distributor, and the laying thickness is 2mm. The tray is placed in the bell-type low-temperature sintering furnace through the charging system.

[0038] 2. Turn on the cooling water and compressed air system, and adjust the air flow to 80ml / min. Turn on the heating power supply, and the temperature rise system is as follows: from room temperature to 300°C at a rate of 2°C / min, then to 500°C at 8°C / min, and keep warm for 1 hour.

[0039] 3. Turn off the compressed air, evacuate for 30 minutes, pass in Ar to wash the furnace for 20 minutes, and pass in Ar+4%H 2 , the gas flow rate is 10ml / min. Heat up to 700°C at a heating rate of 10°C per minute and keep warm for 3 hours; turn off the heating power, and cool down with water in the low temperatu...

Embodiment 3

[0045] Preparation of High Temperature Reactor Fuel Element UO 2 The method of kernel, this method comprises the following steps:

[0046] 1. The dry microspheres containing 4KgU are laid on a circular stainless steel tray through a distributor, and the laying thickness is 0.8mm. The tray is placed in the bell-type low-temperature sintering furnace through the charging system.

[0047] 2. Turn on the cooling water and compressed air system, and adjust the air flow to 200ml / min. Start the heating power supply, and the temperature rise system is as follows: from room temperature to 300°C at a rate of 1.5°C / min, then to 550°C at 6°C / min, and keep warm for 1 hour.

[0048] 3. Turn off the compressed air, evacuate for 20 minutes, pass in Ar to wash the furnace for 10 minutes, and pass in Ar+4%H 2 , the gas flow rate is 2ml / min. Keep warm at 550°C for 4 hours; turn off the heating power, and cool down the low-temperature furnace with water; when the temperature drops to 50°C, tu...

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Abstract

The invention relates to a preparation method for high temperature reactor fuel element UO2 core, relating to the roasting, the reducing and the burning processes of raw material micro ball of UO2 core, and belonging to the technical filed of the reactor fuel element production method. The method is characterized in that the raw material micro ball is paved inside a stainless steel pallet and then is arranged inside a low temperature furnace; air is fed into the low temperature furnace for heating and roasting, and then is kept with temperature range from 450 DEG C to 550 DEG C for one hour; vacuum air is fed into an Ar washing furnace; a reducing reaction is implemented with heating speed of 5 to 10 DEG C per minute; the reduced micro ball is arranged into a pot and then is arranged into a high temperature burning furnace behind the washing furnace to burn the micro ball; and the temperature is decreased and air is closed, and the pot is taken out so as to obtain the high temperature reactor fuel element UO2 core. The low temperature furnace takes a clock cover shape or a case shape low temperature furnace. The invention combines the roasting and the reducing into one furnace to complete, decreases the one-off cooling and heating process, reduces the one-off fabric procedure, effectively shortens the production period, prolongs the service time of the furnace, lowers the production cost, and is suitable to production on scale.

Description

technical field [0001] The invention relates to a high temperature gas stack fuel element UO 2 The roasting, reduction and sintering in the core preparation process belong to the technical field of reactor nuclear fuel element manufacturing methods. technical background [0002] UO based on sol-gel method 2 In the preparation process of the fuel core, whether it is the external gelling, internal gelling or full gelling process, after the gel ball is dried, it must be roasted, reduced and sintered to obtain a size and sphericity that meet the design requirements, uniform , dense UO 2 ceramic microspheres. The three processes of roasting, reduction and sintering are in UO 2 The production of cores is defined as a dry process. The main function of the dry process is: the dried gel balls contain hydrocarbons such as polyvinyl alcohol, methyl cellulose and tetrahydrofurfuryl alcohol, and the main function of roasting is to oxidize these hydrocarbons by heating to generate CO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G43/025G21C3/62G21C21/02
CPCY02E30/38Y02E30/30
Inventor 梁彤祥郭文利赵兴宇郝少昌
Owner TSINGHUA UNIV
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