CN104318962A - Location grid rack provided with streamline low pressure drop runner, and fuel assembly - Google Patents
Location grid rack provided with streamline low pressure drop runner, and fuel assembly Download PDFInfo
- Publication number
- CN104318962A CN104318962A CN201410549202.1A CN201410549202A CN104318962A CN 104318962 A CN104318962 A CN 104318962A CN 201410549202 A CN201410549202 A CN 201410549202A CN 104318962 A CN104318962 A CN 104318962A
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- CN
- China
- Prior art keywords
- pressure drop
- grid spacer
- convex
- low pressure
- plane
- Prior art date
- 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
- G21C3/34—Spacer grids
- G21C3/352—Spacer grids formed of assembled intersecting strips
-
- 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 discloses a location grid rack provided with a streamline low pressure drop runner. The location grid rack comprises a plurality of inner strip bands, and an outer strip band, wherein the plurality of inner strip bands intersect with one another, so that a latticed grid structure and a plurality of hollow grid units are formed; the outer strip band is arranged at the periphery of the grid structure in a surrounding way and is fixed together with the inner strip bands; rigid bulges are respectively fixedly arranged on the inner strip bands and extend towards the interiors of the grid units in a convex way; each rigid bulge comprises a plane and a side surface, wherein each plane is contacted with a fuel rod, and each side surface is smoothly connected between the plane and the corresponding inner strip band in a sealing way; a downward corner angle is formed at the lowermost end of each side surface; the at least one pair of rigid bulges which are arranged in an opposite way are arranged in each grid unit. According to the location grid rack, due to the ship-shaped structures of the rigid bulges, an incident flow area and fluid eddies are reduced, the pressure drop is reduced, and the fuel rod is prevented from being scratched. Correspondingly, the invention also discloses a fuel assembly provided with the location grid rack.
Description
Technical field
The present invention relates to nuclear fuel assembly technical field, particularly relate to and a kind ofly there is the grid spacer of streamlined low pressure drop runner and there is the fuel assembly of this grid spacer.
Background technology
The fuel rod of some is according to certain intervals arrangement (as: 15 × 15 or 16 × 16 etc.) and be fixed to a branch of, be called reactor fuel assemblies, reactor fuel assemblies is primarily of upper base, bottom nozzle, grid spacer (also claim mixing grillwork or keep grid), control rod guide pipe and fuel rod composition.Wherein, grid spacer is used for loading and locating fuel rod and be made up of multiple interior band and outer band, and the mutually orthogonal formation of multiple interior bands has the latticed cell structure of multiple grill unit, and outer band is surrounded on outside interior band regularly.Except a few grill unit is used for arranging except control rod guide pipe, an all accommodating fuel rod in remaining each grill unit.
In the process of fuel assembly work, cooling medium (water) flows through fuel assembly continuously from lower to upper to take away the amount of heat produced in fuel rod fission reaction, the flowing of cooling medium can produce certain impact to the fuel rod in grid spacer, therefore, in order to keep the stable of fuel rod, as shown in Figure 1, band b is provided with in addition the firm convex a protruded out in grill unit in grid spacer, utilizes firm convex a to clamp firm fuel rod to supporting of fuel rod.In the prior art, firm convex a is generally directly stamped to form on interior band b, twice punching press is carried out respectively by the both sides of inside band b, the firm convex a of two semicircles of convex inside band b both sides can be formed, firm convex a above being wherein positioned at has opening down, and the firm convex a below being positioned at has opening upward.Within same grill unit, include four firm convex a of semicircle, wherein two opening up firm convex a are relative, and two downward opening firm convex a are also relative.
Although become the technique of firm convex a comparatively simple in interior band b upper punch swaging, but there are two defects in the structure of the firm convex a of this semicircle: one, when cooling medium flows through grid spacer from lower to upper, be positioned at the fluoran stream surface long-pending comparatively large (being 1/4th spheres) of the firm convex a of semicircle of below, convection cell produces larger resistance, be unfavorable for that pressure keeps, and the inside being positioned at the firm convex a of semicircle of top can form a cavity, cooling medium forms eddy current after flowing into cavity, thus increases the pressure loss of fluid; Two, when loading fuel rod from top to bottom, there is section the upper end being positioned at the firm convex a of semicircle of below in grill unit, likely can scrape fuel rod, makes fuel rod surface produce cut and impaired.
Therefore, be necessary to provide a kind of fluid pressure loss less and can avoid scratching the grid spacer of fuel rod.
Summary of the invention
The object of the present invention is to provide a kind of fluid pressure loss less and can avoid scratching the grid spacer of fuel rod.
Another object of the present invention is to provide a kind of fuel assembly with described grid spacer.
To achieve these goals, the invention provides a kind of grid spacer with streamlined low pressure drop runner, comprise multiple interior band and outer band, multiple described interior band mutually intersects in latticed cell structure and forms the grill unit of multiple hollow, described outer band is around in the periphery of described cell structure and fixes with described interior band, described interior band is fixed with protrude out in described grill unit just convex, described firm convex closure is drawn together the plane that contacts with fuel rod and is closed and the side be connected to smoothly between described plane and described interior band, the corner angle formed bottom down of described side, what have in described grill unit that at least one pair of is oppositely arranged is described just convex.
Compared with prior art, because the present invention is by the semicircle of the prior art just convex structure having changed the closed integrated comprising described plane and described side into, the smooth connection of described side is between described plane and described interior band, therefore the traffic channel formed in described grill unit is streamlined, the impact dirty on coolant fluid is little, facilitates fluid flow through.Described just convex be enclosed construction, do not form the cavity of opening, therefore can not produce fluid vortex and increase pressure drop; All-in-one-piece structure also can avoid fluid in grill unit, intersect the vibration of mixing screen work and the fuel rod caused, and stability is high.Further, the corner angle be formed bottom down of described side, namely the fluoran stream surface of described firm convex lower end is long-pending less, and when fluid upwards flows through described corner angle, deformation is less, and the pressure loss significantly reduces than pressure loss when meeting with sphere.To sum up, grid spacer of the present invention can realize the object of low pressure drop.In addition, described side is continuous and closed, does not have section, and fuel rod, when loading, can be led smoothly, and the situation avoiding fuel rod to be scratched occurs.
Preferably, described side is from the one end be connected with described plane to one end smooth expansion be gradually connected with described interior band.Described side is from the one end be connected with described plane to one end smooth expansion be gradually connected with described interior band, the traffic channel then formed in described grill unit is the Venturi tube structure of convergent flaring, thus can resistance be reduced, make fluid soft, flow uniformly through.
Preferably, the upper end of described side is level and smooth arc.The upper end of described side forms level and smooth arc and is conducive to realizing to the guiding of fuel rod and prevents from causing damage to fuel rod.
Preferably, described plane is parallel with described interior band.
Preferably, described plane is sub-elliptical and the angular shape of lower end band.Described plane is set to sub-elliptical and the angular shape of lower end band, the entirety that described plane and described side are formed by connecting then presents the structure of hull shape, utilizes the shape advantage of hull shape can effectively reduce fluid resistance and pressure drop.
Particularly, the seamed edge of described corner angle is positioned at perpendicular.Described seamed edge is positioned at described perpendicular, then described hull shape is just convex in setting vertical end to end, about convection cell plays the water conservancy diversion on vertical direction.
More specifically, the described just convex symmetrical structure in plane centered by the perpendicular through described seamed edge.Symmetrical structure is more conducive to maintaining stablizing and reducing sinuous flow of fluid.
Particularly, described firm convex opposed vertical direction is inclined to set.By described firm convex inclination, advantage be cooling medium from bottom to top can be drained into screen work top mix wing place, what can promote cooling medium mixes effect, and the energy improved between fuel rod is mixed, and core temperature is evenly distributed, and improves safety allowance.
Preferably, four difference are provided with in described grill unit facing each other described just convex.Four described is just convexly oppositely arranged between two in a described grill unit, then four described just convex between space can form the runner of more complete Venturi tube structure, be conducive to keeping hydrodynamic pressure.
Accordingly, present invention also offers a kind of fuel assembly, comprise base, bottom nozzle, multiple described grid spacer, multiple fuel rod and multiple control rod guide pipe, multiple described grid spacer arranges along the vertical direction, multiple described fuel rod and control rod guide pipe are inserted in described grid spacer respectively, upper end and the described upper base of described control rod guide pipe are fixed, and lower end and the described bottom nozzle of described control rod guide pipe are fixed.
Compared with prior art, have all-in-one-piece described just convex described grid spacer owing to have employed in fuel assembly of the present invention, therefore fluid-pressure drop is lower, and can prevent from scratching fuel rod.
Accompanying drawing explanation
Fig. 1 is floor map semicircle just convex in the screen work of prior art.
Fig. 2 is cut-open view semicircle just convex in the screen work of prior art.
Fig. 3 is the stereographic map of part grid spacer in first embodiment of the invention.
Fig. 4 is the vertical view of part grid spacer in first embodiment of the invention.
Fig. 5 is the side view of part grid spacer in first embodiment of the invention.
Fig. 6 is the structure composition schematic diagram of fuel assembly in first embodiment of the invention.
Fig. 7 is the side view of part grid spacer in second embodiment of the invention.
Embodiment
Below in conjunction with the Figure of description provided, description is made to preferred embodiment of the present invention.
As Fig. 3 to 5 is depicted as the first embodiment of the present invention.A kind of grid spacer 1 with streamlined low pressure drop runner is provided in the present embodiment, described grid spacer 1 comprises multiple interior band 10 and outer band 11, multiple described interior band 10 mutually intersects in latticed cell structure and forms the grill unit 12 of multiple hollow, and described outer band 11 is around in the periphery of described cell structure and fixes with described interior band 10.Described interior band 10 is fixed with protrude out in described grill unit 12 just convex 13, describedly just convex 13 comprise the plane 130 that contacts with fuel rod 4 and closed and the side 131 be connected to smoothly between described plane 130 and described interior band 10, the corner angle 132 formed bottom down of described side 131, have in described grill unit 12 that at least one pair of is oppositely arranged described just convex 13.
Concrete, described plane 130 is in sub-elliptical and the angular shape of lower end band and described plane 130 is parallel with described interior band 10, and described side 131 is from the one end be connected with described plane 130 to one end smooth expansion be gradually connected with described interior band 10.Visible, the entirety that described plane 130 and described side 131 are formed by connecting is the structure of a hull shape, as everyone knows, " tip " profile design of hull is to reduce the resistance be subject in water, therefore just convex 13 hull shape is designed to by described, also can reduce its resistance to coolant fluid, be conducive to reducing pressure drop.
With " sub-elliptical ", described plane 130 is described in the present embodiment, it is emphasised that described plane 130 has wedge angle due to lower end, therefore and do not meet the equation of standard ellipse.Described plane 130 is strips similar with standard ellipse, distance (i.e. height) between its upper and lower two ends is greater than the distance (i.e. width) between its two ends, left and right, every shape meeting this relation, all can think in the limited range of " sub-elliptical ", therefore " sub-elliptical " is not the restriction of a smudgy Chu.In addition, about the distance between described plane 130 and described interior band 10, the present embodiment is not construed as limiting, and the effect of described plane 130 is clamping fuel rods, and therefore the distance protruded of its mutually internal band 10 act as prerequisite determine according to actual conditions to realize this.
The corner angle 132 of lower end, described side 131 have a seamed edge, because described side 131 is expanded according to the above mode, therefore one end that described seamed edge is connected with described plane 130 is positioned at top, and the one end be connected with described interior band 10 be positioned at below, namely described seamed edge compared with surface level in skewed.In the vertical direction, strip described just convex 13 in vertically arranging, described seamed edge is positioned at one perpendicular to the perpendicular of described just convex 13 place bands 10, and described just convex 13 symmetrical structures in plane centered by this perpendicular.Describedly just convex 13 vertically to arrange, is then also roughly vertically extended, about therefore convection cell plays the water conservancy diversion on vertical direction by described just convex 13 traffic channels surrounded in described grill unit 12.And just convex 13 be set to opposed vertical plane structure symmetrically by described, be more conducive to maintaining stablizing and reducing sinuous flow of fluid.
Because the lower end of described plane 130 forms wedge angle and upper end does not have wedge angle, therefore described just convex 13 in above-below direction not symmetrically structure.Its lower end has described corner angle 132, and the upper end of described side 131 is level and smooth arc, thus is conducive to realizing the guiding of fuel rod and preventing from causing damage to fuel rod.
The mode that described side 131 is extended to described interior band 10 by described plane 130 can be straight, also can outwards arch upward or cave inward.In order to obtain optimum efficiency, the present embodiment adopts straight extension mode.
In grill unit 12 described in each, be provided with four described just convex 13, four described just convex 13 in described grill unit 12 in being symmetrical arranged between two, four are described convex 13 has been just be fixed on four sidewalls of described grill unit 12 respectively.And for described interior band 10, on it protrude into adjacent two described grill unit 12 two described in just convex 13 position be overlapping, be namely located at the not homonymy of the same position of described interior band 10.Four facing each other described just convex 13 are arranged in grill unit 12 described in each, then four described runners just formed between convex 13 are convergent flaring " venturi " structures, fairshaped like this runner be conducive to reduce resistance, make fluid soft, flow uniformly through and keep comparatively low pressure drop.
As for arrange on described interior band 10 described just convex 13 method, can adopt casting or welding.When adopting the method for casting, should make describedly just convex 13 to be similarly stamped to form, described so convex 13 has been just the design of hollow, can reduce the weight of screen work.When adopting the method for welding, can adopt two plates respectively punching press form two different directions described just convex 13, then that two plates is welded together and form described interior band 10.
Please refer to Fig. 6, the invention also discloses a kind of fuel assembly, comprise base 2, bottom nozzle 3, multiple described grid spacer 1, multiple fuel rod 4 and multiple control rod guide pipe 5, multiple described grid spacer 1 arranges along the vertical direction, multiple described fuel rod 4 and control rod guide pipe 5 are inserted in described grid spacer 1 respectively, upper end and the described upper base 2 of described control rod guide pipe 5 are fixed, and lower end and the described bottom nozzle 3 of described control rod guide pipe 5 are fixed.Described control rod guide pipe 5 and fuel rod 4 are exactly be plugged in described grill unit 12, and particularly, the several described grill unit 12 of minority for holding described control rod guide pipe 5, and has a fuel rod 4 in the described grill unit 12 of other majorities respectively.
The present invention compared with prior art, because the present invention is by the semicircle of the prior art just convex structure having changed the closed integrated comprising described plane 130 and described side 131 into, described side 131 smooth connection is between described plane 130 and described interior band 10, therefore the traffic channel formed in described grill unit 12 is streamlined, the impact dirty on coolant fluid is little, facilitates fluid flow through.Described convex 13 has been just enclosed constructions, does not form the cavity of opening, therefore can not produce fluid vortex and increase pressure drop; All-in-one-piece structure also can avoid fluid in grill unit 12, intersect the vibration of mixing screen work and the fuel rod 4 caused, and stability is high.Further, the corner angle 132 be formed bottom down of described side 131, namely the fluoran stream surface of described just convex 13 lower ends is long-pending less, and when fluid upwards flows through described corner angle 132, deformation is less, and the pressure loss significantly reduces than pressure loss when meeting with sphere.To sum up, grid spacer 1 of the present invention can realize the object of low pressure drop.In addition, described side 131 is continuous and closed, does not have section, and fuel rod 4, when loading, can be led smoothly, and the situation avoiding fuel rod 4 to be scratched occurs.
Second embodiment of the present invention as shown in Figure 7, in the present embodiment, just the structure of convex 13 ' is identical with a upper embodiment, and the one-piece construction of grid spacer 1 ' is also substantially identical with a upper embodiment, to be in the present embodiment described just convex 13 ' not vertically arranges for its difference, but opposed vertical direction is inclined to set, its lower end opposite upper deflects certain angle (within ± 30 °), the position of mixing the wing 101 within the direction of concrete deflection, band 10 arranged is as the criterion, the advantage be obliquely installed be cooling medium from bottom to top can be drained into described interior band 10 top mix the wing 101 place, what can promote cooling medium mixes effect, the energy improved between fuel rod is mixed, core temperature is evenly distributed, improve safety allowance.
Above disclosedly be only preferred embodiments of the present invention, its effect facilitates those skilled in the art to understand and implements according to this, certainly the interest field of the present invention can not be limited with this, therefore according to the equivalent variations that the present patent application the scope of the claims is done, the scope that the present invention is contained still is belonged to.
Claims (10)
1. one kind has the grid spacer of streamlined low pressure drop runner, comprise multiple interior band and outer band, multiple described interior band mutually intersects in latticed cell structure and forms the grill unit of multiple hollow, described outer band is around in the periphery of described cell structure and fixes with described interior band, it is characterized in that: described interior band is fixed with protrude out in described grill unit just convex, described firm convex closure is drawn together the plane that contacts with fuel rod and is closed and the side be connected to smoothly between described plane and described interior band, the corner angle formed bottom down of described side, what have in described grill unit that at least one pair of is oppositely arranged is described just convex.
2. there is the grid spacer of streamlined low pressure drop runner as claimed in claim 1, it is characterized in that: described side is from the one end be connected with described plane to one end smooth expansion be gradually connected with described interior band.
3. there is the grid spacer of streamlined low pressure drop runner as claimed in claim 1, it is characterized in that: the upper end of described side is level and smooth arc.
4. there is the grid spacer of streamlined low pressure drop runner as claimed in claim 1, it is characterized in that: described plane is parallel with described interior band.
5. there is the grid spacer of streamlined low pressure drop runner as claimed in claim 1, it is characterized in that: described plane is sub-elliptical and the angular shape of lower end band.
6. there is the grid spacer of streamlined low pressure drop runner as claimed in claim 5, it is characterized in that: the seamed edge of described corner angle is positioned at perpendicular.
7. there is the grid spacer of streamlined low pressure drop runner as claimed in claim 6, it is characterized in that: the described just convex symmetrical structure in plane centered by the perpendicular through described seamed edge.
8. there is the grid spacer of streamlined low pressure drop runner as claimed in claim 5, it is characterized in that: described firm convex opposed vertical direction is inclined to set.
9. there is the grid spacer of streamlined low pressure drop runner as claimed in claim 1, it is characterized in that: be provided with four difference in described grill unit facing each other described just convex.
10. a fuel assembly, comprise base, bottom nozzle, multiple grid spacer, multiple fuel rod and multiple control rod guide pipe, multiple described grid spacer arranges along the vertical direction, multiple described fuel rod and control rod guide pipe are inserted in described grid spacer respectively, upper end and the described upper base of described control rod guide pipe are fixed, lower end and the described bottom nozzle of described control rod guide pipe are fixed, and it is characterized in that: described grid spacer is as described in any one of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410549202.1A CN104318962B (en) | 2014-10-16 | 2014-10-16 | Grid spacer and fuel assembly with streamlined low pressure drop runner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410549202.1A CN104318962B (en) | 2014-10-16 | 2014-10-16 | Grid spacer and fuel assembly with streamlined low pressure drop runner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104318962A true CN104318962A (en) | 2015-01-28 |
| CN104318962B CN104318962B (en) | 2017-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410549202.1A Active CN104318962B (en) | 2014-10-16 | 2014-10-16 | Grid spacer and fuel assembly with streamlined low pressure drop runner |
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| CN (1) | CN104318962B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106710640A (en) * | 2017-02-28 | 2017-05-24 | 上海核工程研究设计院 | Low pressure drop rigid support grid with coplanar design |
| CN106710642A (en) * | 2017-02-28 | 2017-05-24 | 上海核工程研究设计院 | Rigid support grid for fuel assembly bottom foreign object filtering |
| CN107195341A (en) * | 2017-05-17 | 2017-09-22 | 华北电力大学 | The on-line monitoring device that nuclear power plant containment shell fragment influences on fuel assembly pressure drop |
| CN109920561A (en) * | 2019-02-27 | 2019-06-21 | 广东核电合营有限公司 | Fuel assembly and grid spacer |
| CN109935369A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of lattice cell, spacer grid of fuel assembly and fuel assembly |
| CN112735611A (en) * | 2019-10-14 | 2021-04-30 | 韩电原子力燃料株式会社 | Support grid for nuclear fuel assembly having simple shape structure |
| CN115050489A (en) * | 2022-06-27 | 2022-09-13 | 中国核动力研究设计院 | Spacer grid with coolant-guided coordinated flow for nuclear fuel assembly |
| CN106710640B (en) * | 2017-02-28 | 2024-05-14 | 上海核工程研究设计院股份有限公司 | Low pressure drop rigid support grid with coplanar design |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106710640A (en) * | 2017-02-28 | 2017-05-24 | 上海核工程研究设计院 | Low pressure drop rigid support grid with coplanar design |
| CN106710642A (en) * | 2017-02-28 | 2017-05-24 | 上海核工程研究设计院 | Rigid support grid for fuel assembly bottom foreign object filtering |
| CN106710640B (en) * | 2017-02-28 | 2024-05-14 | 上海核工程研究设计院股份有限公司 | Low pressure drop rigid support grid with coplanar design |
| CN106710642B (en) * | 2017-02-28 | 2024-05-14 | 上海核工程研究设计院股份有限公司 | Rigid support grid for filtering foreign matters at bottom of fuel assembly |
| CN107195341A (en) * | 2017-05-17 | 2017-09-22 | 华北电力大学 | The on-line monitoring device that nuclear power plant containment shell fragment influences on fuel assembly pressure drop |
| CN109935369A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of lattice cell, spacer grid of fuel assembly and fuel assembly |
| CN109920561A (en) * | 2019-02-27 | 2019-06-21 | 广东核电合营有限公司 | Fuel assembly and grid spacer |
| CN112735611A (en) * | 2019-10-14 | 2021-04-30 | 韩电原子力燃料株式会社 | Support grid for nuclear fuel assembly having simple shape structure |
| CN115050489A (en) * | 2022-06-27 | 2022-09-13 | 中国核动力研究设计院 | Spacer grid with coolant-guided coordinated flow for nuclear fuel assembly |
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| CN104318962B (en) | 2017-07-14 |
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