CN1133176C - Method for preparing Gd2O3-UO2 flammable poison fuel core block by using U3O8 powder - Google Patents

Method for preparing Gd2O3-UO2 flammable poison fuel core block by using U3O8 powder Download PDF

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Publication number
CN1133176C
CN1133176C CN01110140A CN01110140A CN1133176C CN 1133176 C CN1133176 C CN 1133176C CN 01110140 A CN01110140 A CN 01110140A CN 01110140 A CN01110140 A CN 01110140A CN 1133176 C CN1133176 C CN 1133176C
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China
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powder
gd2o3
hour
burnable poison
poison fuel
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CN1319848A (en
Inventor
周荣生
邹从沛
易伟
贺剑锋
何山
刘晓荣
许奎
梅晓辉
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Nuclear Power Institute of China
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Nuclear Power Institute of China
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Abstract

The present invention provides a method for preparing Gd2O3-UO2 burnable poison fuel pellets. The present invention comprises the following processing steps: uranyl tricarbonate (AUC) or ammonium diuranate (ADU) is calcined into triuranium octoxide (U3O8) powder as raw material; a proper quantity of gadolinium sesquioxide (Gd2O3) powder is added into the triuranium octoxide (U3O8) powder; the mixed powder of the gadolinium sesquioxide (Gd2O3) powder and the triuranium octoxide (U3O8) powder is prepared into gadolinium sesquioxide-uranium dioxide (Gd2O3-UO2) burnable poison fuel pellets by mixing, granulating, cold press moulding and stepwise temperature rise sintering in dry H2. Compared with the original process, the method for preparing Gd2O3-UO2 burnable poison fuel pellets, which is provided by the present invention has simple process, high safety and low cost, and the prepared fuel pellets have good external appearance and stable quality.

Description

Use U 3O 8Powder preparation Gd 2O 3-UO 2The method of burnable poison fuel pellet
Technical field
The present invention relates to a kind of preparation method of nuclear fuel, the preparation method of particularly a kind of three oxidations, two Gadolinium-uranium dioxide burnable poison fuel pellet.
Background technology
Conventional method prepares gadolinium sesquioxide-uranium dioxide (Gd 2O 3-UO 2) the burnable poison fuel pellet, generally adopting powder of uranium dioxide is raw material; " Journal of NuclearMaterials ", 1988, P115-126, mark is to be entitled as: the document of " Survey of binary oxide fuelmanufacturing and quality control " discloses a kind of preparation method, with powder of uranium dioxide mix with gadolinium sesquioxide, after the cold moudling, earlier at micro-oxidizing atmosphere (wet H 2), (do H at reducing atmosphere afterwards 2) descend sintering to form.Its raw material UO 2Powder is obtained through decomposition, reduction and complete dry method (IDR) by wet method uranyl tricarbonate (AUC) and ammonium diuranate (ADU).But this method has the following disadvantages: prepare UO by traditional handicraft 1. 2Powder needs through " decomposition, reduction, stabilisation " operation, and is loaded down with trivial details and cost is high; 2. because anoxic when forming solid solution in the sintering process, must be earlier during sintering at micro-oxidizing atmosphere, in reducing atmosphere, carry out afterwards, troublesome poeration, lack security.
Summary of the invention
The purpose of this invention is to provide a kind of U of using 3O 8Powder preparation Gd 2O 3-UO 2The method of burnable poison fuel pellet, this method have simply, safe, stable, the characteristics such as cost is low, good product quality.
The objective of the invention is to realize by following scheme.
A kind of U that uses 3O 8Powder preparation Gd 2O 3-UO 2The method of burnable poison fuel pellet is characterized in that comprising following processing step:
(1) ammonium uranyl tricarbonate (AUC) or ammonium diuranate (ADU) are sintered into triuranium octoxide (U 3O 8), the condition of calcining is: AUC or ADU progressively are warming up to 800 ℃-900 ℃ from room temperature, were incubated 3 hours-5 hours, programming rate is 300 ℃/hour-400 ℃/hour, when treating that temperature is down to room temperature, gets U 3O 8Powder;
(2) U 3O 8Powder with account for gross weight 4%-8%Gd 2O 3Powder is even, granulation, and granularity is 10 μ m-50 μ m, then cold moudling, blank density is 5.0g/cm 3-6.0g/cm 3
(3) place sintering furnace at H base substrate 2Sintering in the atmosphere, 1000 ℃ is 200 ℃/hour-300 ℃/hour with programming rate before, programming rate is 400 ℃/hour-500 ℃/hour between 1000 ℃-1700 ℃, 1700 ℃ of insulations 3 hours-4 hours, gets Gd 2O 3-UO 2The burnable poison fuel pellet.
The preparation method that the present invention proposes is owing to directly adopt U 3O 8Be raw material, saved preparation UO 2" decomposition, reduction, stabilisation " operation that powder must carry out is simplified technology, has reduced cost; Because U 3O 8Powder has good flowability, laxity, but thereby good briquettability arranged, bring a lot of facilities for batch mixing, moulding, the pellet outward appearance zero defect of making, quality is good; In the sintering process, because U 3O 8Oxygen enrichment does not need micro-oxidizing atmosphere and reducing atmosphere, can be directly at dried H 2In carry out, improved the safety and stability of technology.
Embodiment
Embodiment 1
(1) gets 1000 gram ammonium uranyl tricarbonate (AUC) powder or ammonium diuranate (ADU) powder in the material boat, to expect that boat places calcining furnace, begin progressively to heat up from room temperature, programming rate is 300 ℃/hour, rise to 800 ℃, be incubated 3 hours, stopped heating, room temperature to be cooled to is taken out the U that the material boat must have greater activity 3O 8Powder 500 grams;
(2) with U 3O 8Powder and the Gd that accounts for gross weight 4% 2O 3After powder is even with mechanical mixture, granulation, granularity is 10 μ m-50 μ m, then cold moudling, green density is 5.0g/cm 3
(3) place intermediate frequency furnace at H on green compact 2Sintering under the atmosphere, programming rate is 200 ℃/hour before 1000 ℃, programming rate is 400 ℃/hour between 1000 ℃-1700 ℃, 1700 ℃ of insulations 3 hours, makes Gd 2O 3-UO 2Burnable poison fuel pellet, density are 94%T.D.
Embodiment 2.
(1) gets 1000 gram ammonium uranyl tricarbonate (AUC) powder or ammonium diuranate (ADU) powder in the material boat, to expect that boat places calcining furnace, room temperature begins progressively to heat up, programming rate is 350 ℃/hour, rises to 850 ℃, is incubated 4 hours, stopped heating, room temperature to be cooled to will expect that boat takes out the U that must have greater activity 3O 8Powder 500 grams;
(2) with U 3O 8Powder and the Gd that accounts for gross weight 6% 2O 3Powder with mechanical mixture evenly after, make granularly, granularity is 10 μ m-50 μ m, then cold moudling, green density is 5.5g/cm 3
(3) place intermediate frequency furnace at H on green compact 2Sintering under the atmosphere, programming rate is 250 ℃/hour before 1000 ℃, programming rate is 450 ℃/hour between 1000 ℃-1750 ℃, 1750 ℃ of insulations 3.5 hours, makes Gd 2O 3-UO 2Burnable poison fuel pellet, density are 95%T.D.
Embodiment 3.
(1) gets 1000 gram ammonium uranyl tricarbonate (AUC) powder or ammonium diuranate (ADU) powder in the material boat, to expect that boat places calcining furnace, begin progressively to heat up from room temperature, programming rate is 400 ℃/hour, rises to 900 ℃, is incubated 5 hours, stopped heating, room temperature to be cooled to is taken out the U that must have greater activity from the material boat 3O 8Powder 500 grams;
(2) with U 3O 8Powder and the Gd that accounts for gross weight 8% 2O 3After powder is even with mechanical mixture, preparing granular, granularity is 10-50 μ m, then cold moudling, green density is 6.0g/cm 3
(3) place intermediate frequency furnace at H on green compact 2Sintering under the atmosphere, programming rate is 300 ℃/hour before 1000 ℃, programming rate is 500 ℃/hour between 1000 ℃-1700 ℃, 1700 ℃ of insulations 4 hours, makes Gd 2O 3-UO 2Burnable poison fuel pellet, density are 97%T.D..

Claims (2)

1. use U for one kind 3O 8Powder preparation Gd 2O 3-UO 2The method of burnable poison fuel pellet is characterized in that may further comprise the steps:
(1) with U 3O 8With the 4%-8%Gd that accounts for gross weight 2O 3Powder, granulation, granularity is 10 μ m-50 μ m, then cold moudling, blank density is 5.0g/cm 3-6.0g/cm 3
(2) place sintering furnace at H base substrate 2Sintering under the atmosphere, programming rate is 200 ℃/hour-300 ℃/hour before 1000 ℃, the programming rate between 1000 ℃-1700 ℃ is 400 ℃/hour-500 ℃/hour, 1700 ℃ of insulations 3 hours-4 hours, makes Gd 2O 3-UO 2The burnable poison fuel pellet.
2. the method for burnable poison fuel pellet as claimed in claim 1 is characterized in that by ammonium uranyl tricarbonate (AUC) or ammonium diuranate (ADU) through being sintered into triuranium octoxide (U 3O 8), the condition of calcining is: AUC or ADU progressively are warming up to 800 ℃-900 ℃ from room temperature, were incubated 3 hours-5 hours, programming rate is 300 ℃/hour-400 ℃/hour, treats that temperature is down to room temperature, gets U 3O 8Powder.
CN01110140A 2001-03-30 2001-03-30 Method for preparing Gd2O3-UO2 flammable poison fuel core block by using U3O8 powder Expired - Lifetime CN1133176C (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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CN101572127B (en) * 2008-04-28 2012-10-03 中科华核电技术研究院有限公司 Nuclear fuel rod, nuclear fuel component and nuclear reactor core

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CN100364016C (en) * 2004-12-02 2008-01-23 中国核动力研究设计院 Material mixing process and device for preparing (U, Gd) 02 combustible poisonous core block
CN101188147B (en) * 2007-12-26 2011-07-27 中国核动力研究设计院 A nucleus fuel with carborundum as inertial base and its making method
CN101633521B (en) * 2009-08-17 2011-10-26 昆明理工大学 Method for producing triuranium octoxide by microwave calcination of ammonium diuranate
CN103831990B (en) * 2012-11-21 2016-01-20 中核建中核燃料元件有限公司 Acrawax is added into UO by one 2the device and method of powder compaction pellet
CN103058666B (en) * 2012-12-29 2014-05-21 中国核动力研究设计院 Method for preparing ZrO2-Gd2O3 burnable poison material
FR3005046B1 (en) * 2013-04-29 2015-05-15 Commissariat Energie Atomique NEW MATERIAL BASED ON URANIUM, GADOLINIUM AND OXYGEN AND USE THEREOF AS CONSUMABLE NEUTRONIC POISON
CN103691956B (en) * 2014-01-03 2016-06-22 中国原子能科学研究院 Annular thin wall Al-NpO2The preparation technology of disperse pellet
CN104751903B (en) * 2015-03-11 2017-07-18 中国核动力研究设计院 A kind of TiO2Adulterate UO2‑10wt%Gd2O3Burnable poison and preparation method thereof
CN108335768B (en) * 2018-02-01 2019-08-09 中国工程物理研究院材料研究所 A kind of preparation method of the fuel pellet based on nanometer titanium dioxide uranium or its compound
CN109545414B (en) * 2018-12-06 2020-06-05 中国科学院上海应用物理研究所 Preparation method of fuel particles and core-shell type fuel particles obtained by preparation method
KR102128532B1 (en) * 2019-10-29 2020-06-30 한국과학기술원 Disk-type Burnable Absorber for Nuclear Reactor Fuel
CN113012835A (en) * 2019-12-20 2021-06-22 中核北方核燃料元件有限公司 Preparation method of gadolinium-containing annular uranium dioxide core block

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101572127B (en) * 2008-04-28 2012-10-03 中科华核电技术研究院有限公司 Nuclear fuel rod, nuclear fuel component and nuclear reactor core

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