CN105788685A - Method for preparing annular uranium dioxide pellet - Google Patents
Method for preparing annular uranium dioxide pellet Download PDFInfo
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- CN105788685A CN105788685A CN201410830528.1A CN201410830528A CN105788685A CN 105788685 A CN105788685 A CN 105788685A CN 201410830528 A CN201410830528 A CN 201410830528A CN 105788685 A CN105788685 A CN 105788685A
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- annular
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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 invention belongs to the technical field of nuclear fuel element pellet preparation and particularly relates to a method for preparing an annular uranium dioxide pellet.An annular female die, an annular lower punch and a core bar are fixed, the core bar is sleeved with the lower punch, the lower punch is sleeved with the female die, a supporting rod is arranged below the female die, and weighed UO2 powder is packed into an annular space formed between the female die and the core bar; an annular upper punch is placed into the annular space formed by the female die and the core bar, and a press is used for pressing the UO2 powder into a UO2 green body; the upper punch is taken out, a die releasing ejector block is used for releasing the UO2 green body, and the annular UO2 green body is taken out; the UO2 green body is sintered into a UO2 pellet; the outer diameter of the pellet is ground.The prepared UO2 annular pellet with the inner wall and the outer wall capable of containing cladding pipe can be applied to a single-cladding fuel assembly and can also be applied to a double-cladding fuel assembly.
Description
Technical field
The invention belongs to nuclear fuel element pellet preparing technical field, be specifically related to a kind of annular uranium dioxide pellet preparation method.
Background technology
Development along with nuclear power technology, size and structure and the size of inner core fuel pellet, shape, the arrangement etc. of fuel element be have also been made and are correspondingly improved by research worker, nuclear reactor safety is made to improve constantly, more making reactor capability increase further, the effective rate of utilization of uranium have also been obtained and improves constantly simultaneously.
The domestic at present VVER-1000 fuel assembly that only China Jianzhong Nuclear Fuel Co., Ltd. produces uses a kind of mesopore pellet being similar to Annular pellet, the external diameter of pellet is about 7.57mm, center-hole diameter is 1.3mm～1.9mm, internal diameter is less, it similarly is axially beaten a through hole at solid pellet, and this mesopore pellet id tolerance ranges up to 0.6mm, and fuel assembly only increases by one layer of cladding tubes at pellet outer wall, and fuel assembly list cladding tubes manufacture difference commonly used at present is not quite.
In New Ring-like Type pellet and VVER-1000 fuel assembly and AP1000 fuel assembly, Annular pellet is maximum is distinctive in that, the Annular pellet that VVER-1000 and AP1000 uses be all come with solid pellet together with load in cladding tubes, only have one layer of cladding tubes outside pellet.And New Ring-like Type pellet inside and outside wall can fill cladding tubes, New Ring-like Type pellet external diameter is 14.08mm～14.12mm, center-hole diameter is 9.90mm～9.96mm, and id tolerance scope only has 0.06mm.
Summary of the invention
It is an object of the invention to provide a kind of New Ring-like Type uranium dioxide pellet preparation method.
For reaching above-mentioned purpose, the technical solution used in the present invention is:
A kind of annular uranium dioxide pellet preparation method, by UO2Powder is granulated；The former of annular, annular low punch and core bar being fixed, low punch is enclosed within outside core bar, and former is enclosed within outside low punch, and former bottom is provided with support bar, by weighed UO2Powder packing is in the annular space that former and core bar are formed；The upper punch of annular is put into the annular space that former is formed with core bar, utilizes press by UO2Powder pressing forming UO2Green compact；Take out upper punch, utilize demoulding jacking block by UO2The green compact demoulding, takes out annular UO2Green compact；By UO2Green sintering becomes UO2Pellet；Pellet external diameter is carried out grinding.
Described annular uranium dioxide pellet preparation parameter is as follows: granulation pressure: 40～65kN；Pressing pressure: 15～25kN, can suitably adjust pressure according to powder suppression performance；Sintering temperature: 1600 DEG C～1690 DEG C；Sintering time: 21 hours；Sintering atmosphere: hydrogen；Sintering pressure: pressure-fired.
Having the beneficial effect that acquired by the present invention
(1) UO prepared by the present invention2Annular pellet both can apply to single clad fuel assemblies, can also apply to double; two clad fuel assemblies.(2) present invention enriches the domestic research to nuclear fuel element manufacture, and for later by using the fuel assembly of Annular pellet, improving constantly the security performance of reactor, augmenting response heap power, the effective rate of utilization improving uranium further lays the foundation.(3) having present invention determine that the method for designing of Annular pellet mould, and by series of experiments, the workability of the Annular pellet mould of design has been verified, Annular pellet mould is feasible effectively.(4) present invention determine that PHWR fuel ball is prepared production line and produced the feasibility of Annular pellet, provided reference and foundation for subsequent production and scientific research.(5) the invention a whole set of from test, be designed into equipment needed thereby, frock prepares, and then is applied to the Annular pellet preparation method produced, research and the practical application further to later Annular pellet, be significant.
Accompanying drawing explanation
Fig. 1 is the female mould structure figure of Annular pellet mould；
Fig. 2 is the upper punch structure chart of Annular pellet mould；
Fig. 3 is the low punch structure chart of Annular pellet mould；
Fig. 4 is the core bar structure figure of Annular pellet mould；
Fig. 5 is annular UO2Green compact pressing process is loaded powder step schematic diagram；
Fig. 6 is annular UO2Compressing step schematic diagram in green compact pressing process；
Fig. 7 is annular UO2Green compact demoulding step schematic diagram in green compact pressing process；
In figure: 1, UO2Powder；2, former；3, core bar；4, support bar；5, low punch；6, upper punch；7, demoulding jacking block.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Fig. 1 Fig. 7, annular uranium dioxide pellet preparation method of the present invention is as follows:
By UO2Powder is granulated, and improves mobility and the apparent density of powder；The former 2 of annular, annular low punch 5 and core bar 3 being fixed, it is outside that low punch 5 is enclosed within core bar 3, and it is outside that former 2 is enclosed within low punch 5, and former 2 bottom is provided with support bar 4, by weighed UO2Powder 1 is seated in the annular space of former 2 and core bar 3 formation；The upper punch 6 of annular is put into the annular space that former 2 is formed with core bar 3, utilizes press under a certain pressure by UO2The compressing UO of powder 12Green compact；Take out upper punch 6, utilize demoulding jacking block 7 by UO2The green compact demoulding, takes out annular UO2Green compact；By UO2Green sintering becomes UO2Pellet；According to technology requirement, pellet external diameter is carried out grinding so that it is external diameter and roughness meet requirement.
Annular uranium dioxide pellet preparation parameter is as follows:
Granulation pressure: 40～65kN；Pressing pressure: 15～25kN, can suitably adjust pressure according to powder suppression performance；Sintering temperature: 1600 DEG C～1690 DEG C；Sintering time: 21 hours；Sintering atmosphere: hydrogen；Sintering pressure: pressure-fired.
Claims (2)
1. an annular uranium dioxide pellet preparation method, it is characterised in that: by UO2Powder is granulated；The former (2) of annular, annular low punch (5) and core bar (3) are fixed, it is outside that low punch (5) is enclosed within core bar (3), it is outside that former (2) is enclosed within low punch (5), former (2) bottom is provided with support bar (4), by weighed UO2Powder (1) is seated in the annular space that former (2) and core bar (3) are formed；The upper punch (6) of annular is put into the annular space that former (2) is formed with core bar (3), utilizes press by UO2Powder (1) compressing UO2Green compact；Take out upper punch (6), utilize demoulding jacking block (7) by UO2The green compact demoulding, takes out annular UO2Green compact；By UO2Green sintering becomes UO2Pellet；To UO2Pellet external diameter carries out grinding.
2. annular uranium dioxide pellet preparation method according to claim 1, it is characterised in that: described annular uranium dioxide pellet preparation parameter is as follows: granulation pressure: 40～65kN；Pressing pressure: 15～25kN；Sintering temperature: 1600 DEG C～1690 DEG C；Sintering time: 21 hours；Sintering atmosphere: hydrogen；Sintering pressure: pressure-fired.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410830528.1A CN105788685A (en) | 2014-12-26 | 2014-12-26 | Method for preparing annular uranium dioxide pellet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410830528.1A CN105788685A (en) | 2014-12-26 | 2014-12-26 | Method for preparing annular uranium dioxide pellet |
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| CN105788685A true CN105788685A (en) | 2016-07-20 |
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| CN201410830528.1A Pending CN105788685A (en) | 2014-12-26 | 2014-12-26 | Method for preparing annular uranium dioxide pellet |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653126A (en) * | 2016-12-28 | 2017-05-10 | 中核北方核燃料元件有限公司 | Method and mould for preparing annular UO2 fuel pellet |
| CN106653125A (en) * | 2016-12-28 | 2017-05-10 | 中核北方核燃料元件有限公司 | Manufacture method of UO2 fuel pellet, with central opening, through powder metallurgic method |
| CN106683726A (en) * | 2016-12-28 | 2017-05-17 | 中核北方核燃料元件有限公司 | Forming mold of center-opened nuclear fuel pellet |
| CN108695008A (en) * | 2017-04-07 | 2018-10-23 | 中核北方核燃料元件有限公司 | A kind of low micro- heap UO of denseization2The automatic forming method of fuel pellet green compact |
| CN109741844A (en) * | 2018-12-29 | 2019-05-10 | 中核北方核燃料元件有限公司 | A kind of automatic tubulature device of pellet |
| CN112851349A (en) * | 2020-12-31 | 2021-05-28 | 中核北方核燃料元件有限公司 | Method for forming core block with hole in center |
| CN112846177A (en) * | 2020-12-31 | 2021-05-28 | 中核北方核燃料元件有限公司 | Porous core blank forming method |
| 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 |
| CN113035402A (en) * | 2019-12-24 | 2021-06-25 | 中核建中核燃料元件有限公司 | Strip-shaped sheet UO2Method for preparing core block |
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| CN101740150A (en) * | 2009-12-17 | 2010-06-16 | 中国核动力研究设计院 | Method for preparing annular UO2 fuel pellet |
| US20100254847A1 (en) * | 2009-04-06 | 2010-10-07 | Korea Atomic Energy Research Institute | Method for manufacturing sintered annular nuclear fuel pellet without surface grinding |
| CN203650665U (en) * | 2013-12-19 | 2014-06-18 | 博深工具股份有限公司 | Crucible cold-press forming mould |
| CN103894607A (en) * | 2014-04-23 | 2014-07-02 | 上海交通大学 | Forming method and die of anisotropic annular magnet |
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2014
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Patent Citations (4)
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| US20100254847A1 (en) * | 2009-04-06 | 2010-10-07 | Korea Atomic Energy Research Institute | Method for manufacturing sintered annular nuclear fuel pellet without surface grinding |
| CN101740150A (en) * | 2009-12-17 | 2010-06-16 | 中国核动力研究设计院 | Method for preparing annular UO2 fuel pellet |
| CN203650665U (en) * | 2013-12-19 | 2014-06-18 | 博深工具股份有限公司 | Crucible cold-press forming mould |
| CN103894607A (en) * | 2014-04-23 | 2014-07-02 | 上海交通大学 | Forming method and die of anisotropic annular magnet |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653126A (en) * | 2016-12-28 | 2017-05-10 | 中核北方核燃料元件有限公司 | Method and mould for preparing annular UO2 fuel pellet |
| CN106653125A (en) * | 2016-12-28 | 2017-05-10 | 中核北方核燃料元件有限公司 | Manufacture method of UO2 fuel pellet, with central opening, through powder metallurgic method |
| CN106683726A (en) * | 2016-12-28 | 2017-05-17 | 中核北方核燃料元件有限公司 | Forming mold of center-opened nuclear fuel pellet |
| CN108695008A (en) * | 2017-04-07 | 2018-10-23 | 中核北方核燃料元件有限公司 | A kind of low micro- heap UO of denseization2The automatic forming method of fuel pellet green compact |
| CN108695008B (en) * | 2017-04-07 | 2021-10-22 | 中核北方核燃料元件有限公司 | UO for low-concentration micro-reactor2Automatic forming method of fuel pellet green body |
| CN109741844A (en) * | 2018-12-29 | 2019-05-10 | 中核北方核燃料元件有限公司 | A kind of automatic tubulature device of pellet |
| CN109741844B (en) * | 2018-12-29 | 2022-10-21 | 中核北方核燃料元件有限公司 | Automatic core block pipe installing device |
| 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 |
| CN113035402A (en) * | 2019-12-24 | 2021-06-25 | 中核建中核燃料元件有限公司 | Strip-shaped sheet UO2Method for preparing core block |
| CN112851349A (en) * | 2020-12-31 | 2021-05-28 | 中核北方核燃料元件有限公司 | Method for forming core block with hole in center |
| CN112846177A (en) * | 2020-12-31 | 2021-05-28 | 中核北方核燃料元件有限公司 | Porous core blank forming method |
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Application publication date: 20160720 |
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