CN103280246A - Liquid heavy metal cooling reactor fuel element - Google Patents

Liquid heavy metal cooling reactor fuel element Download PDF

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Publication number
CN103280246A
CN103280246A CN2013101954440A CN201310195444A CN103280246A CN 103280246 A CN103280246 A CN 103280246A CN 2013101954440 A CN2013101954440 A CN 2013101954440A CN 201310195444 A CN201310195444 A CN 201310195444A CN 103280246 A CN103280246 A CN 103280246A
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China
Prior art keywords
section
fuel
counterweight
end plug
heavy metal
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CN2013101954440A
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CN103280246B (en
Inventor
韩骞
吴庆生
彭蕾
梅华平
黄群英
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Hefei Institutes of Physical Science of CAS
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Hefei Institutes of Physical Science of CAS
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

Abstract

The invention discloses a liquid heavy metal cooling reactor fuel element which belongs to the field of nuclear engineering. The liquid heavy metal cooling reactor fuel element comprises a fuel section and a counterweight section, wherein the fuel section comprises a fuel core block, upper and lower reflection layers, an air chamber, a pressure spring and upper and lower end plugs; the counterweight section comprises a counterweight filler and upper and lower end plugs; the fuel section and the counterweight section are both sealed with a jacketed pipe. The liquid heavy metal cooling reactor fuel element can be mounted and fixed in a liquid heavy metal cooling reactor core by utilizing self gravity, is simple in design and low in processing development difficulty, has the inherent safety feature, lowers the accidental risk and is suitable for a reactor in which a coolant is liquid heavy metal with high density.

Description

A kind of liquid heavy metal cooled reactor fuel element
Technical field
The present invention relates to a kind of liquid heavy metal cooled reactor fuel element, be applicable to that cooling medium is the reactor of the bigger liquid heavy metal alloy of density.
Background technology
The ADS of Accelerator Driven Subcritical system is the nuclear power system that a kind of desirable nuke rubbish transmuting, nuclear fuel propagation and energy produces.From the technical development route, the liquid lead alloy is the main candidate material of present ADS transmuting reactor coolant owing to have good neutronics characteristic, security feature and heat-transfer capability.Yet the liquid lead alloy density is bigger than the average density of fuel assembly, and fuel assembly can't rely on self gravitation to sink to being mounted and fixed in the reactor core as the traditional fuel assembly in the liquid lead alloy.For addressing this problem, the correlative study personnel have proposed two kinds of fixing meanss---counterweight and locking device both at home and abroad.Counter weight device is adopted in the design of the fixing means of ALFRED reactor fuel assemblies, its structure as shown in Figure 1, the A section is fuel system, the B section is Weighting system, in this design, Weighting system is positioned at beyond pressure vessel and the safety container, and the device that reloads loads and unloads by the grappling fixture above the Weighting system.The design need beat and the same number of hole of fuel assembly at the top cover of safety container and pressure vessel, is unfavorable for the airtight of reactor core, and has increased the accident risk that radioactive waste pollutes and fission product leaks.The XADS reactor fuel assemblies adopts locking device to fix, structure as shown in Figure 2, this project organization complexity, difficulty of processing is big, spring leaf and sliding block material are selected the difficulty height, the security that physical construction was on active service in the reactor environment midium or long term can't guarantee, and not solve fuel assembly when installing and be on active service, the problem that buoyancy can produce swing and vibrate assembly.
To sum up, the shortcoming that known liquid heavy metal cooled reactor fuel assembly structure design exists has: the fixed form of (1) employing locking, and complex structural designs is meticulous, difficulty of processing is big, and the device that reloads design is complicated, and the working time of reloading is longer, does not have inherent safety.(2) employing is installed in Weighting system outside the fuel element, need do bigger change to reactor core, has increased the design difficulty of reactor core and the risk that radiant matter is revealed, and assignment of traffic and heat accumulative total are caused adverse effect.
Summary of the invention
Technology of the present invention is dealt with problems: it is meticulous to overcome existing external project organization complexity, difficulty of processing is big, shortcomings such as accident risk height, a kind of liquid heavy metal cooled reactor fuel element is provided, has simplicity of design, inherent safety, the device that reloads is simple, do not influence assignment of traffic, can not cause advantages such as heat accumulative total, can generally be used for the reactor of liquid heavy metal as cooling medium.
Technical scheme of the present invention is: a kind of liquid heavy metal cooled reactor fuel element comprises: fuel section 1, counterweight section 2 and involucrum pipe 3; Fuel section 1 comprises end plug 10 under fuel section upper end plug 4, holddown spring 5, last reflection horizon 6, fuel pellet 7, following reflection horizon 8, air chamber 9 and the fuel section; Described counterweight section 2 comprises end plug 13 under counterweight section upper end plug 11, counterweight filling material 12 and the counterweight section; The butt end of fuel section upper end plug 4 and involucrum pipe 3 link together, fuel section 1 is followed successively by end plug 10 under fuel section upper end plug 4, holddown spring 5, last reflection horizon 6, fuel pellet 7, following reflection horizon 8, air chamber 9 and the fuel section from top to bottom, and each several part is stacked in the involucrum pipe 3 according to this; End plug 10 links together with involucrum pipe 3 under the fuel section, with fuel section 1 sealing; End plug 10 is connected with counterweight section upper end plug 11 under the fuel section; Counterweight section 2 is installed in fuel element inside, by 3 sealings of involucrum pipe; Counterweight section 2 is end plug 13 under counterweight section upper end plug 11, counterweight filling material 12 and the counterweight section from top to bottom, and each several part is stacked in the involucrum pipe 3 according to this; The butt end of end plug 13 and involucrum pipe 3 weld together under the counterweight section.
Described fuel section upper end plug 4 is identical with end plug 13 structures under the counterweight section, plays sealing and fixing whole fuel element.
End plug 10 is identical with counterweight section upper end plug 11 structures under the described fuel section, plays sealing and is connected two sections of fuel elements.
In the described counterweight section 2 counterweight filling material 12 is arranged, counterweight filling material 12 selection density liken the bigger metal of liquid heavy metal density into reactor coolant to, and density range is from 10g/cm 3-25g/cm 3As fixed form, in installation process, fuel assembly can rely on the self gravitation vertical subsidence to be installed on the reactor core base with counterweight.
Described air chamber 9 upper ends are following reflection horizon 8, and the lower end is end plug 10 under the fuel section, and each several part is stacked in the involucrum pipe 3 according to this, rely on steel pipe that air chamber is supported.In phase in longevity, the air chamber upper end needs support compression spring 5, goes up reflection horizon 6, fuel pellet 7 and following reflection horizon 8 fuel element, supports air chamber 9 with steel pipe and has improved security, makes fuel element not yielding under arms.
The present invention's advantage compared with prior art is: the invention enables described fuel element to utilize self gravitation can be implemented in installation in the liquid heavy metal cooled reactor reactor core and fixing, simplicity of design, processing development difficulty is low, has inherent safety, has reduced accident risk.The present invention is specially adapted to the reactor that cooling medium is the bigger liquid heavy metal of density.
Description of drawings
The existing ALFRED reactor fuel assemblies of Fig. 1;
Fig. 2 is existing XADS reactor fuel assemblies bottom locking device;
Fig. 3 is agent structure synoptic diagram of the present invention.
Embodiment
A kind of liquid lead-containing alloy cooling fast neutron reactor fuel element that proposes below in conjunction with 3 couples of the present invention of accompanying drawing is further introduced:
As shown in Figure 3, the present invention includes: fuel section 1, counterweight section 2 and involucrum pipe 3; Fuel section 1 comprises end plug 10 under fuel section upper end plug 4, holddown spring 5, last reflection horizon 6, fuel pellet 7, following reflection horizon 8, air chamber 9 and the fuel section; Counterweight section 2 comprises end plug 13 under counterweight section upper end plug 11, counterweight filling material 12 and the counterweight section; The upper end plug 4 thick sections of fuel section 1 are welded together with involucrum pipe 3, be followed successively by holddown spring 5, last reflection horizon 6, fuel pellet 7, following reflection horizon 8, air chamber 9 and following end plug 10 from top to bottom, each several part is stacked in the involucrum pipe 3 successively, following end plug 10 welds together with involucrum pipe 3, with fuel section 1 sealing.The following end plug 10 of fuel section 1 is same with being weldingly connected with the upper end plug of counterweight section 2 11, is followed successively by counterweight filling material 12 and following end plug 13 from top to bottom, and the butt end of end plug 13 and involucrum pipe 3 weld together under the counterweight section.On structure, following end plug 13 structures of the upper end plug 4 of fuel section 1 and counterweight section are identical, play sealing and fixing whole fuel element; The following end plug 10 of fuel section is identical with upper end plug 11 structures of counterweight section 2, plays sealing and is connected two sections of fuel elements.
The height of counterweight section 2 needs by calculating.Computation process is as follows: at first, and the height h of fuel section 1 1S calculates by reactor physics with sectional area, thereby further determines the volume of needed reflection horizon and air chamber; Secondly according to the service condition of reactor, determine the material of liquid heavy metal cooled reactor can and each part; By above two steps, according to m=ρ v, obtain the gross mass m of fuel section 1Select a kind of weight material, require density of material bigger than the density of liquid heavy metal cooling medium, density range is from 10g/cm 3-25g/cm 3, the height that establishing is heavy section 2 is h 2, external diameter is identical with fuel section 1, thereby obtains the gross mass m of counterweight section 22Sh 2Known coolant is chosen as liquid heavy metal material, thereby obtains the coolant mass m of the volume emptying of described a kind of liquid heavy metal cooled reactor fuel element 33v 33(h 1+ h 2) s.Make m 3=m 1+ m 2, can calculate h 2But because the height h of counterweight section 2 2Not only the average density that must guarantee whole fuel element is greater than liquid heavy metal cooling medium, and can allow whole box fuel assembly support oneself in liquid heavy metal cooling medium.Therefore, the height h of counterweight section 2 2Usually to select greater than its calculated value, less than the described fuel element gravity that material can bear in lifting process.
Air chamber 9 upper ends are following reflection horizon 8, and the lower end is end plug 10 under the fuel section, and each several part is stacked in the involucrum pipe 3 according to this, rely on steel pipe that air chamber is supported, and improve the structural stability of fuel element.
The content that is not described in detail in the instructions of the present invention belongs to this area professional and technical personnel's known prior art.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (5)

1. a liquid heavy metal cooled reactor fuel element is characterized in that comprising: fuel section (1), counterweight section (2) and involucrum pipe (3); Fuel section (1) comprises end plug (10) under fuel section upper end plug (4), holddown spring (5), last reflection horizon (6), fuel pellet (7), following reflection horizon (8), air chamber (9) and the fuel section; Described counterweight section (2) comprises end plug (13) under counterweight section upper end plug (11), counterweight filling material (12) and the counterweight section; The butt end of fuel section upper end plug (4) and involucrum pipe (3) link together, fuel section (1) is followed successively by end plug (10) under fuel section upper end plug (4), holddown spring (5), last reflection horizon (6), fuel pellet (7), following reflection horizon (8), air chamber (9) and the fuel section from top to bottom, and each several part is stacked in the involucrum pipe (3) according to this; End plug under the fuel section (10) links together with involucrum pipe (3), and fuel section (1) is sealed; End plug under the fuel section (10) is connected with counterweight section upper end plug (11); Counterweight section (2) is installed in fuel element inside, is sealed by involucrum pipe (3); Counterweight section (2) is end plug (13) under counterweight section upper end plug (11), counterweight filling material (12) and the counterweight section from top to bottom, and each several part is stacked in the involucrum pipe (3) according to this; The butt end of end plug under the counterweight section (13) and involucrum pipe (3) weld together.
2. liquid heavy metal cooled reactor fuel element according to claim 1, it is characterized in that: described fuel section upper end plug (4) is identical with end plug (13) structure under the counterweight section, plays sealing and fixing whole fuel element.
3. liquid heavy metal cooled reactor fuel element according to claim 1, it is characterized in that: end plug under the described fuel section (10) is identical with counterweight section upper end plug (11) structure, plays sealing and is connected two sections of fuel elements.
4. liquid heavy metal cooled reactor fuel element according to claim 1, it is characterized in that: counterweight filling material (12) is arranged in the described counterweight section (2), counterweight filling material (12) selection density likens the bigger metal of liquid heavy metal density into reactor coolant to, and density range is from 10g/cm 3-25g/cm 3
5. liquid heavy metal cooled reactor fuel element according to claim 1 is characterized in that: described air chamber (9) relies on steel pipe to support and forms, and outer diameter of steel pipes needs the internal diameter less than described liquid heavy metal cooled reactor fuel element.
CN201310195444.0A 2013-05-23 2013-05-23 A kind of liquid heavy metal cooled reactor fuel element Expired - Fee Related CN103280246B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016161728A1 (en) * 2015-04-08 2016-10-13 中科华核电技术研究院有限公司 Novel choke plug assembly for radioactive source preparation in pressurized water reactor, and radioactive rod
CN106796821A (en) * 2014-10-01 2017-05-31 西屋电气有限责任公司 Nuclear fuel element ripple pumping chamber hold-down gear
CN106782682A (en) * 2016-12-30 2017-05-31 清华大学天津高端装备研究院 A kind of fuel assembly for lead bismuth heap
CN106875984A (en) * 2016-12-28 2017-06-20 中国科学院合肥物质科学研究院 A kind of new accident fault tolerant fuel component

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JPS5487380A (en) * 1977-12-22 1979-07-11 Toshiba Corp Fuel rod manufacturing method
JPH01176978A (en) * 1988-01-07 1989-07-13 Toshiba Corp Metal fuel element
US4885123A (en) * 1987-02-13 1989-12-05 Hitachi, Ltd. Apparatus for handling constituent elements of reactor core
CN1993771A (en) * 2004-06-01 2007-07-04 阿海珐核能公司 Method for operating a nuclear reactor and use of a specific alloy of nuclear fuel pencil cladding for reducing damage caused by pellet/cladding interaction
CN101567226A (en) * 2008-03-24 2009-10-28 西屋电气有限责任公司 Fuel rod and assembly containing an internal hydrogen/tritium getter structure
CN102282626A (en) * 2008-08-26 2011-12-14 西屋电气有限责任公司 mixed oxide fuel assembly

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5487380A (en) * 1977-12-22 1979-07-11 Toshiba Corp Fuel rod manufacturing method
US4885123A (en) * 1987-02-13 1989-12-05 Hitachi, Ltd. Apparatus for handling constituent elements of reactor core
JPH01176978A (en) * 1988-01-07 1989-07-13 Toshiba Corp Metal fuel element
CN1993771A (en) * 2004-06-01 2007-07-04 阿海珐核能公司 Method for operating a nuclear reactor and use of a specific alloy of nuclear fuel pencil cladding for reducing damage caused by pellet/cladding interaction
CN101567226A (en) * 2008-03-24 2009-10-28 西屋电气有限责任公司 Fuel rod and assembly containing an internal hydrogen/tritium getter structure
CN102282626A (en) * 2008-08-26 2011-12-14 西屋电气有限责任公司 mixed oxide fuel assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106796821A (en) * 2014-10-01 2017-05-31 西屋电气有限责任公司 Nuclear fuel element ripple pumping chamber hold-down gear
WO2016161728A1 (en) * 2015-04-08 2016-10-13 中科华核电技术研究院有限公司 Novel choke plug assembly for radioactive source preparation in pressurized water reactor, and radioactive rod
CN106875984A (en) * 2016-12-28 2017-06-20 中国科学院合肥物质科学研究院 A kind of new accident fault tolerant fuel component
CN106875984B (en) * 2016-12-28 2018-04-10 中国科学院合肥物质科学研究院 A kind of new accident fault tolerant fuel component
CN106782682A (en) * 2016-12-30 2017-05-31 清华大学天津高端装备研究院 A kind of fuel assembly for lead bismuth heap

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