CN106229016A - A kind of board-like holddown spring of two-part fuel assembly - Google Patents
A kind of board-like holddown spring of two-part fuel assembly Download PDFInfo
- Publication number
- CN106229016A CN106229016A CN201610826052.3A CN201610826052A CN106229016A CN 106229016 A CN106229016 A CN 106229016A CN 201610826052 A CN201610826052 A CN 201610826052A CN 106229016 A CN106229016 A CN 106229016A
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- CN
- China
- Prior art keywords
- spring
- fuel assembly
- springs
- board
- groups
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/33—Supporting or hanging of elements in the bundle; Means forming part of the bundle for inserting it into, or removing it from, the core; Means for coupling adjacent bundles
- G21C3/331—Comprising hold-down means, e.g. springs
-
- 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
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The present invention provides a kind of board-like holddown spring of two-part fuel assembly, and it includes that groups of springs, described groups of springs include at least two spring leaf；The lower section of described groups of springs is provided with cantilevered spring leaf.The board-like holddown spring of two-part fuel assembly that the present invention provides, at the first paragraph stroke inner spring covering normal operating condition amount of spring compression, there is less rigidity, maintain less thrust allowance to prevent fuel assembly from while promoting, avoiding fuel assembly that macrobending occurred.At the second segment stroke inner spring covering extreme transient state amount of spring compression, there is bigger rigidity, thus strictly limit moving axially of fuel assembly.
Description
Technical field
The present invention relates to a kind of board-like holddown spring of two-part fuel assembly.
Background technology
Fuel assembly is the critical component of nuclear reactor, and it produces heat energy and this heat energy is passed to coolant.Combustion
Material assembly is washed away by the coolant flow through at a high speed from bottom to top in nuclear reactor, bears bigger hydraulic hoisting power.Therefore, exist
Fuel assembly top is generally disposed with holddown spring, is used for providing thrust, prevents assembly to be washed lifting.
Common form of springs envelope leaf spring, helical spring etc..The fuel assembly wherein using leaf spring is usual
Circumferentially equipping 4 groups of holddown springs, often the group generally sheet material of 3 or 4 same thickness of employing bends and forms.In reactor
Under normal operating condition, flat spring is produced downward thrust by the compression of reactor core upper plate, and the rigidity of spring is designed
Fuel assembly can be made to be pressed in reactor core support lower plate for thrust, not move axially；But due to excessive thrust
Assembly can be caused to bend in heap, therefore when design, generally thrust will not be left and taken excessive allowance.This causes working as
When extreme transient state occurs, when thrust is not enough to offset lifting force in water upwards, assembly can occur certain moving axially, but
This size moved axially should be strictly limited.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose a kind of board-like holddown spring of two-part fuel assembly.
The board-like holddown spring of two-part fuel assembly includes some groups of groups of springs, and described groups of springs is for PWR Fuel
Assembly board-like holddown spring group, often organizes described groups of springs and includes that at least two spring leaf, described spring leaf are positioned at top and can
Laminating is together；The lower section of described groups of springs is provided with the most a piece of cantilevered spring leaf.
Preferably, described groups of springs is PWR fuel assembly board-like holddown spring group.
Preferably, described each groups of springs includes four or five described spring leafs.
Preferably, in described groups of springs, the spring leaf of several laminatings is configured in being subject to during extruding axially downwardly deforming base
This is identical, it is provided that with deflection close to linear thrust.
Preferably, the decrement of described several laminating spring leaf is configured and just makes compression change under normal condition in heap
After shape, the cantilever spring piece with the bottom in described groups of springs is affixed.
Compared with prior art, the method have the advantages that
1, the board-like holddown spring of two-part fuel assembly that the present invention provides, is covering normal operating condition amount of spring compression
First paragraph stroke inner spring there is less rigidity, maintain less thrust allowance prevent fuel assembly promote while avoid
There is macrobending in fuel assembly.Have bigger firm at the second segment stroke inner spring covering extreme transient state amount of spring compression
Degree, thus strictly limit moving axially of fuel assembly
2, the board-like holddown spring of two-part fuel assembly that the present invention provides, is covering the of extreme transient state amount of spring compression
Two-stage nitration forms inner spring and has bigger rigidity, thus strictly limits moving axially of fuel assembly.
3, the board-like holddown spring of two-part fuel assembly that the present invention provides, it is possible to obtain the fuel assembly of two-stage type compresses
Spring, in first paragraph stroke, rigidity is less, can be that fuel assembly provides big when reactor is the most properly functioning
Little suitable thrust, it is to avoid fuel assembly thrust is excessive to bend.Form interior rigidity at second segment relatively big, can be pole
End transient fuel assembly provides bigger resistance when moving axially.
Accompanying drawing explanation
Fig. 1 is the board-like holddown spring design on common fuel assembly top；
Fig. 2 is the board-like holddown spring of two-part fuel assembly with a piece of cantilever that the present invention proposes.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, real with concrete below in conjunction with the accompanying drawings
The present invention is further detailed explanation to execute mode.
As it is shown in figure 1, common PWR fuel assembly holddown spring group generally has 3～4 flat spring sheets (1)～(4) group
Becoming, above-mentioned spring leaf is close together, and when being subject to extruding axially downwardly, above-mentioned spring has essentially identical deformation, groups of springs
Overall offer and deflection are close to linear thrust.
During as in figure 2 it is shown, employing designs as described in the present invention, below conventional groups of springs, it is further added by a piece of cantilevered
Spring leaf (5), when normal reaction stack operation, the decrement of spring leaf (1)～(4) is designed to just make spring leaf
(4) being affixed with (5), i.e. when the transient state lifting force increased suddenly, if assembly is elevated, spring leaf (5) will provide volume
Outer rigidity, spring leaf (1)～(5) provide a bigger rigidity jointly.
Two-stage spring is made up of spring leaf (1)～(4) and spring leaf (1)～(5) respectively, thus provides the compression of stagewise
Force curve, carries out detailed design by parameters such as the thickness of adjustment plate spring, width, angles, it is possible to obtain required two sections of springs
Rigidity and separation, thus reach design object.
The board-like holddown spring of two-part fuel assembly that the present embodiment provides, additionally increases in conventional leaf spring bottom
The cantilevered spring leaf of a piece of redundancy, this spring leaf is designed to meet such as with distance and the angle of other several flat springs
Lower requirement:
Under normal reactor operation state, original a few flat spring sheets will not be touched the spring of this redundancy after compressing
Sheet, it is ensured that under this state, the rigidity of whole groups of springs is less.
When extreme transient fuel assembly promotes generation, original a few flat spring sector-meetings quickly touch this spring leaf, should
The spring leaf of redundancy is that groups of springs provides extra rigidity, so that it is guaranteed that the moving axially by strictly of fuel assembly under this state
Limit.
The thickness of this spring leaf is according to specifically promoting how much rigidity and detailed design.
Common board-like holddown spring has close to linear stiffness curve, therefore to leave and take thrust allowance less
Time, it is impossible to the thrust increased suddenly is provided, limits the lifting force that transient state increases suddenly.
And the board-like holddown spring of two-part fuel assembly that the present embodiment provides, it is possible to the layer of model in record RVM file
Level relation i.e. Model Structure Tree and the geometric parameter information of model, then utilize secondary development tool CAA of CATIA
It is reconstructed in CATIA environment by (Component Application Architecture).By this method migration
Model contains all solid information and model hierarchical relationship in former RVM file, can give simultaneously and use PDMS to set as three-dimensional
The user of meter software uses the softwares such as the emulation of Da Suo company, checking, model data management to solve the problem that model is incompatible.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment, identical similar portion sees mutually.For system disclosed in embodiment
For, owing to corresponding to the method disclosed in Example, so describe is fairly simple, relevant part sees method part explanation
?.
Those skilled in the art can use different methods to realize described function to each specifically should being used for, but
It is this realization it is not considered that beyond the scope of this invention.
Obviously, those skilled in the art can carry out various change and the modification spirit without deviating from the present invention to invention
And scope.So, if the present invention these amendment and modification belong to the claims in the present invention and equivalent technologies thereof scope it
In, then the present invention is also intended to change and including modification include these.
Claims (2)
1. the board-like holddown spring of two-part fuel assembly, including groups of springs, described groups of springs is for PWR Fuel group
Part board-like holddown spring group, described groups of springs includes at least two spring leaf；It is characterized in that, described groups of springs except being positioned on
Outside the spring leaf together of the laminating in portion, also include the most a piece of cantilevered spring leaf being positioned at lower section.
The board-like holddown spring of two-part fuel assembly the most according to claim 1, it is characterised in that the spring of described laminating
Sheet deforms essentially identical when being configured in by extruding axially downwardly, it is provided that with deflection close to linear thrust.Described
The decrement of spring leaf of laminating be configured to just to make in heap under normal condition after compression and the cantilever of lower section
Spring leaf is just affixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826052.3A CN106229016A (en) | 2016-09-14 | 2016-09-14 | A kind of board-like holddown spring of two-part fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610826052.3A CN106229016A (en) | 2016-09-14 | 2016-09-14 | A kind of board-like holddown spring of two-part fuel assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106229016A true CN106229016A (en) | 2016-12-14 |
Family
ID=58075537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610826052.3A Pending CN106229016A (en) | 2016-09-14 | 2016-09-14 | A kind of board-like holddown spring of two-part fuel assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106229016A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108053891A (en) * | 2017-12-08 | 2018-05-18 | 中国核动力研究设计院 | A kind of variation rigidity flat spring pressing system |
| CN111709144A (en) * | 2020-06-19 | 2020-09-25 | 中国核动力研究设计院 | Calculation method for calculating rigidity of compression spring |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5053191A (en) * | 1990-09-13 | 1991-10-01 | Combustion Engineering, Inc. | Fuel assembly holddown spring |
| JPH10339788A (en) * | 1997-06-10 | 1998-12-22 | Mitsubishi Heavy Ind Ltd | Upper pushing spring structure for reactor fuel assembly |
| JPH11183675A (en) * | 1997-12-25 | 1999-07-09 | Mitsubishi Heavy Ind Ltd | Pressure spring for fuel assembly and its mounting method |
| JP2000214284A (en) * | 1999-01-20 | 2000-08-04 | Mitsubishi Heavy Ind Ltd | Nuclear reactor fuel assembly and upper pressing spring for reactor fuel assembly |
| CN102136303A (en) * | 2010-01-25 | 2011-07-27 | 韩电原子力燃料株式会社 | Hold-down spring unit for top nozzle of nuclear fuel assembly having improved hold-down performance and top nozzle for nuclear fuel assembly having the same |
| CN103155046A (en) * | 2010-10-11 | 2013-06-12 | 西屋电气有限责任公司 | Nuclear fuel assembly hold down spring |
| CN105513658A (en) * | 2010-01-25 | 2016-04-20 | 韩电原子力燃料株式会社 | Top nozzle for nuclear fuel assembly having spring insert hole improved in fastening stability and method of manufacturing the same |
-
2016
- 2016-09-14 CN CN201610826052.3A patent/CN106229016A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5053191A (en) * | 1990-09-13 | 1991-10-01 | Combustion Engineering, Inc. | Fuel assembly holddown spring |
| JPH10339788A (en) * | 1997-06-10 | 1998-12-22 | Mitsubishi Heavy Ind Ltd | Upper pushing spring structure for reactor fuel assembly |
| JPH11183675A (en) * | 1997-12-25 | 1999-07-09 | Mitsubishi Heavy Ind Ltd | Pressure spring for fuel assembly and its mounting method |
| JP2000214284A (en) * | 1999-01-20 | 2000-08-04 | Mitsubishi Heavy Ind Ltd | Nuclear reactor fuel assembly and upper pressing spring for reactor fuel assembly |
| CN102136303A (en) * | 2010-01-25 | 2011-07-27 | 韩电原子力燃料株式会社 | Hold-down spring unit for top nozzle of nuclear fuel assembly having improved hold-down performance and top nozzle for nuclear fuel assembly having the same |
| CN105513658A (en) * | 2010-01-25 | 2016-04-20 | 韩电原子力燃料株式会社 | Top nozzle for nuclear fuel assembly having spring insert hole improved in fastening stability and method of manufacturing the same |
| CN103155046A (en) * | 2010-10-11 | 2013-06-12 | 西屋电气有限责任公司 | Nuclear fuel assembly hold down spring |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108053891A (en) * | 2017-12-08 | 2018-05-18 | 中国核动力研究设计院 | A kind of variation rigidity flat spring pressing system |
| CN111709144A (en) * | 2020-06-19 | 2020-09-25 | 中国核动力研究设计院 | Calculation method for calculating rigidity of compression spring |
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Application publication date: 20161214 |