CN207558438U - A kind of lattice cell, spacer grid of fuel assembly and fuel assembly - Google Patents
A kind of lattice cell, spacer grid of fuel assembly and fuel assembly Download PDFInfo
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- CN207558438U CN207558438U CN201721772730.9U CN201721772730U CN207558438U CN 207558438 U CN207558438 U CN 207558438U CN 201721772730 U CN201721772730 U CN 201721772730U CN 207558438 U CN207558438 U CN 207558438U
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- lattice cell
- fuel assembly
- fuel
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- grid
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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
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Abstract
The utility model is related to fuel assembly technical fields, a kind of lattice cell, fuel assembly for nuclear reactor grid spacer and fuel assembly are specifically disclosed, the lattice cell is four sides cylinder, including cylinder angle and barrel, plane is processed at cylinder angle, is equipped on the cylinder angle plane of lattice cell just convex；The grid spacer is rearranged by lattice cell；The fuel assembly includes above-mentioned grid spacer.The utility model grid spacer can be suitable for annular fuel element, located lateral is provided fuel element and certain effect of mixing is generated to cooling agent, grid spacer is adjusted to its required flow resistance by setting the protrusion of different protrusion amplitudes on screen work lattice cell.
Description
Technical field
The utility model belongs to fuel assembly technical field, and in particular to a kind of lattice cell, spacer grid of fuel assembly and combustion
Expect component.
Background technology
In nuclear power plant reactor operational process, the performance of nuclear fuel be influence nuclear reactor safety and economy it is important because
Element.Therefore the research of fuel element is placed on very prominent status always in the world, is designed, used by optimizing fuel element
Advanced configuration material improves the methods of component manufacturing process, and the various performances of nuclear fuel element are continuously improved, promote nuclear power to more
Safe and more economical direction is developed.
In the design of existing PWR fuel assembly, fuel rod is generally in a manner that grid spacer clamping is hanging.Positioning
Screen work plays a part of fuel element support clamping, and needs to resist the gravity of fuel element, due to the effect of irradiation,
Clamping the chucking power of the spring of fuel rod can strongly reduce, and fuel rod can be generally fallen on bottom nozzle, make in the flowing of cooling agent
Under, fuel rod may upper and lower play, this can lead to the risk of fuel rod breakage.
To optimize the parameter of fuel element, and use general fuel assembly form construction design so that novel component
It can be suitable for current ripe reactor core.Such as using novel annular fuel element, outer diameter becomes larger, and weight increases, at this time
The chucking power of required grid spacer may increase about 2-4 times, can place that such as spring, just the space of convex clamping piece has become smaller,
This causes fuel element to fall the probability increase on bottom nozzle at runtime, and causes during opening heap again after cold-refueling
The probability of play also increases above and below fuel element.
Meanwhile in the design and manufacture of existing spacer grid of fuel assembly, grid spacer is all made of substantially inside and outside band.
Due to the complexity of its band, 30 multiple kinds of molds are needed when manufacturing.After mold determines, to change grid spacer
Characteristic, such as flow resistance generate better effect etc. to distribution of the cooling agent fuel assembly, need to change wherein almost
The shape of all molds, considerably increases work load.
Therefore, there is an urgent need for designing a kind of novel spacer grid of fuel assembly, with overcome the deficiencies in the prior art.
Invention content
The purpose of this utility model is to provide a kind of lattice cells for spacer grid of fuel assembly, have the combustion of the lattice cell
Expect component grid spacer and fuel assembly.
The technical solution of the utility model is as follows：
A kind of lattice cell, for the grid spacer of fuel assembly for nuclear reactor, the lattice cell is four sides cylinder, including cylinder angle
And barrel, plane is processed respectively at four cylinder angles, is equipped on cylinder angle plane just convex.
Described is firm convex to be round, and to lattice cell internal protrusion, point contact is formed with fuel element.
Described is firm convex to be oval, along the short transverse of lattice cell to lattice cell inner bulge, forms line with fuel element and connects
It touches.
Upper convex portion is equipped in just convex top, for controlling coolant flow, and the effect of mixing is generated to cooling agent.
In just convex lower section, lower protrusion is symmetrically equipped with upper convex portion.
The upper convex portion and lower protrusion are raised to lattice cell outside, and the protrusion amplitude of upper convex portion and lower protrusion is according to reality
The required crossing current mixed of cooling agent and grid spacer can account in fuel assembly flow resistance share limit, required
Mix that crossing current is bigger, while the flow resistance share that can be accounted for the big, the amplitude protruded is bigger.
The firm convex top be equipped with it is inclined on guide surface, make just it is convex seamlessly transitted with lattice cell cylinder angle, convenient fuel
Element is inserted into.
Inclined lower guide surface is equipped in the firm convex lower section.
A kind of spacer grid of fuel assembly is rearranged by the lattice cell.
The lattice cell connects two-by-two, forms the arrangement of N × N.
The two neighboring lattice cell is fixed two-by-two by way of in barrel spot welding.
The value range of N is 3~17.
The value of N is one in 5,7,9,11,13,15.
A lattice cell during lattice cell is arranged takes out, and the position of lattice cell vacancy is as guiding tube passage or instrument tube passage.
There are one the instrument tube passages, positioned at the center that lattice cell is arranged with N × N；Guiding tube passage has several
It is a, centered on instrument tube passage, it is symmetrically arranged.
Guide pipe, which is set on, to be oriented in tube passage, is welded and fixed with the barrel lateral surface of lattice cell.
The quantity, the position consistency that are oriented to tube passage and the guiding tube passage of upper tube socket.
Gauge pipe is set in instrument tube passage, is welded and fixed with the barrel lateral surface of lattice cell.
Outer band is equipped in the outside of lattice cell arrangement, the height of outer band is identical with the height of lattice cell.
Guide vane is equipped in the top edge and lower edge of outer band, prevents fuel assembly mutual hook when assembling
It hangs.
A kind of fuel assembly for nuclear reactor, including the grid spacer.
Further include tube socket, annular fuel element, bottom nozzle, guide pipe and gauge pipe；
Annular fuel element, guide pipe and the gauge pipe is inserted in grid spacer；Grid spacer have it is multiple, successively
It is axially disposed；The upper end of guide pipe and gauge pipe is fixedly connected with upper tube socket, and lower end is fixedly connected with bottom nozzle；
Bottom nozzle is inserted into the lower end of annular fuel element, is fixedly connected with bottom nozzle, when annular fuel element generates irradiation
During growth, expand upwards.
The annular fuel element is by upper end plug, lower end plug, interior involucrum, outer envelope, holddown spring and annular fuel core
Block forms；
Outer envelope is set on the outside of interior involucrum, and upper end plug, the lower end plug of lower section connection are connected above interior involucrum and outer envelope；On
The cavity that end plug, lower end plug, interior involucrum and outer envelope form is used for accommodating annular fuel pellet；
Air cavity is formed between upper end plug and annular fuel pellet, holddown spring, holddown spring one end top are provided in air cavity
On annular fuel pellet, the other end is withstood in upper end plug, and under the thrust of holddown spring, annular fuel pellet is pressed on
Lower end is beyond the Great Wall；Holddown spring provides thrust when transporting fuel, prevents annular fuel pellet play, avoids causing annular fuel core
Block is damaged.
Air-filled pore there are one being set in the upper end plug of the annular fuel element, helium is filled with into air cavity by air-filled pore
Gas is used for heat conduction；
The lower end plug of the annular fuel element is fixed on by eyelets on bottom nozzle.
The beneficial effects of the utility model are：
(1) the utility model lattice cell changes the degree of mixing by setting the protrusion of different protrusion amplitudes, and then adjusts and determine
Position screen work is to its required flow resistance.
(2) the utility model grid spacer can be suitable for the fuel element of bigger outer diameter, such as annular fuel element, to combustion
Expect that element provides located lateral and certain effect of mixing is generated to cooling agent.
(3) common rod shaped fuel element can also be applied in the utility model grid spacer, and can make cooling agent and combustion
Material element more fully contacts.
(4) the utility model fuel assembly is using multiple grid spacer clamping fuel elements axially set, to fuel member
Part is fixed, and keeps fuel element spacing so that and fuel element is located at fixed position in the reactor core of PWR nuclear power plant,
And guide pipe can be caused by cross-brace and positioning.
(5) holddown spring is equipped in the annular fuel element of the utility model fuel assembly, provides and pushes away when transporting fuel
Power prevents annular fuel pellet play, avoids causing annular fuel pellet damaged.
(6) the annular fuel element of the utility model fuel assembly, set in the upper end plug of annular fuel element there are one
Air-filled pore is filled with helium for heat conduction by air-filled pore into air cavity.
(7) the annular fuel element of the utility model fuel assembly is fixed on by eyelets on bottom nozzle, is avoided
The chucking power of the spring of clamping fuel element reduces in operational process, fuel element is caused to fall, fuel member is damaged on bottom nozzle
The problem of part, play above and below fuel element, avoids result in fuel element and breaks when preventing the cooling agent from being flowed up by fuel assembly
The risk of damage.
Description of the drawings
Fig. 1 is one lattice cell structure diagram of embodiment；
Fig. 2 is one spacer grid of fuel assembly schematic diagram of embodiment；
Fig. 3 is outer ribbon structure schematic diagram；
Fig. 4 is two lattice cell structure diagram of embodiment；
Fig. 5 is five lattice cell structure diagram of embodiment；
Fig. 6 is six lattice cell structure diagram of embodiment；
Fig. 7 is annular fuel component structure schematic diagram.
In figure：1. lattice cell；It is 2. just convex；3. upper convex portion；Guide surface on 4.；5. lower guide surface；6. outer band；7. guide pipe leads to
Road；8. guide vane；9. lower protrusion；10. upper end plug；Involucrum in 11.；12. outer envelope；13. holddown spring；14. annular fuel core
Block；15. lower end plug；16. eyelets；17. air-filled pore；18. air cavity.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described in further detail the utility model.
Embodiment one
As shown in Figure 1, lattice cell 1 is four sides cylinder, including cylinder angle and barrel, plane is processed at cylinder angle.In the cylinder of lattice cell 1
Angle plane is equipped with firm convex 2.
Described firm convex 2 are ellipse, and along the short transverse of lattice cell 1 to 1 inner bulge of lattice cell, line is formed with fuel element
Contact.
Guide surface 4 on inclined is equipped with above described firm convex 2, inclined lower guide surface is equipped in just convex 2 lower section
5, make just convex 2 to seamlessly transit with 1 barrel of lattice cell, convenient fuel element is inserted into.
Upper convex portion 3 is equipped in the top of upper guide surface 4, for controlling coolant flow, and cooling agent is generated centainly
The effect of mixing.The upper convex portion 3 is raised to 1 outside of lattice cell.The protrusion amplitude of upper convex portion 3 is required according to practical cooling agent
The crossing current mixed and grid spacer can account in fuel assembly flow resistance share limit, and required crossing current of mixing is got over
Greatly, while the flow resistance share that can account for the big, and the amplitude protruded is bigger.
A kind of lattice cell type spacer grid of fuel assembly, as shown in Fig. 2, being rearranged by lattice cell 1.The lattice cell 1 is two-by-two
Connect, fixed by way of spot welding, form the grid spacer of 17x17.
The lattice cell 1 of lattice cell arrangement center is taken out, as instrument tube passage, gauge pipe is set for the position of 1 vacancy of lattice cell
In in instrument tube passage, it is welded and fixed with the barrel lateral surface of lattice cell 1.
Centered on instrument tube passage, several lattice cells 1 of symmetric position are taken out, the position of 1 vacancy of lattice cell, which is used as, leads
To tube passage 7, guide pipe, which is set on, to be oriented in tube passage 7, with being fixed on the outside of 1 barrel of lattice cell.It is described be oriented to tube passage 7 quantity and
Position and the quantity and position consistency of the guiding tube passage of upper tube socket.
Outer band 6 is equipped in the outside that lattice cell 1 arranges, the height of outer band 6 is identical with the height of lattice cell 1.
As shown in figure 3, the top edge and lower edge in outer band 6 are equipped with guide vane 8, fuel assembly is prevented in assembling
When hook mutually.
Embodiment two
Lattice cell 1 is four sides cylinder, and including cylinder angle and barrel, plane is processed at cylinder angle.It is set on the cylinder angle plane of lattice cell 1
Have firm convex 2.
As shown in figure 4, described firm convex 2 be ellipse, along the short transverse of lattice cell 1 to 1 inner bulge of lattice cell, with fuel
Element forms line contact.
Guide surface 4 on inclined is equipped with above described firm convex 2, inclined lower guide surface is equipped in just convex 2 lower section
5, make just convex 2 to seamlessly transit with 1 barrel of lattice cell, convenient fuel element is inserted into.
A kind of lattice cell type spacer grid of fuel assembly, is rearranged by lattice cell 1.The lattice cell 1 connects two-by-two, passes through a little
The mode of weldering is fixed, and forms the grid spacer of 3x3.
The lattice cell 1 of lattice cell arrangement center is taken out, as instrument tube passage, gauge pipe is set for the position of 1 vacancy of lattice cell
In in instrument tube passage, it is welded and fixed with the barrel lateral surface of lattice cell 1.
Centered on instrument tube passage, several lattice cells 1 of symmetric position are taken out, the position of 1 vacancy of lattice cell, which is used as, leads
To tube passage 7, guide pipe, which is set on, to be oriented in tube passage 7, with being fixed on the outside of 1 barrel of lattice cell.It is described be oriented to tube passage 7 quantity and
Position and the quantity and position consistency of the guiding tube passage of upper tube socket.
Outer band 6 is equipped in the outside that lattice cell 1 arranges, the height of outer band 6 is identical with the height of lattice cell 1.
Guide vane 8 is equipped in the top edge and lower edge of outer band 6, prevents fuel assembly mutual hook when assembling
It hangs.
Embodiment three
Lattice cell 1 is four sides cylinder, and including cylinder angle and barrel, plane is processed at cylinder angle.It is set on the cylinder angle plane of lattice cell 1
Have firm convex 2.
Described firm convex 2 are ellipse, and along the short transverse of lattice cell 1 to 1 inner bulge of lattice cell, line is formed with fuel element
Contact.
Guide surface 4 on inclined is equipped with above described firm convex 2, inclined lower guide surface is equipped in just convex 2 lower section
5, make just convex 2 to seamlessly transit with 1 barrel of lattice cell, convenient fuel element is inserted into.
Upper convex portion 3 is equipped in the top of upper guide surface 4, in the lower section of lower guide surface 5, is symmetrically equipped with down with upper convex portion 3
Protrusion 9 for controlling coolant flow, and generates cooling agent certain effect of mixing.The upper convex portion 3 and lower protrusion 9
To 1 outside protrusion of lattice cell.Upper convex portion 3 and the protrusion amplitude of lower protrusion 9 are according to the required crossing current mixed of practical cooling agent
And grid spacer can account in fuel assembly flow resistance share limits, required crossing current of mixing is bigger, while can account for
Flow resistance share it is more big, the amplitude protruded is bigger.
A kind of lattice cell type spacer grid of fuel assembly, is rearranged by lattice cell 1.The lattice cell 1 connects two-by-two, passes through a little
The mode of weldering is fixed, and forms the grid spacer of 13x13.
The lattice cell 1 of lattice cell arrangement center is taken out, as instrument tube passage, gauge pipe is set for the position of 1 vacancy of lattice cell
In in instrument tube passage, it is welded and fixed with the barrel lateral surface of lattice cell 1.
Centered on instrument tube passage, several lattice cells 1 of symmetric position are taken out, the position of 1 vacancy of lattice cell, which is used as, leads
To tube passage 7, guide pipe, which is set on, to be oriented in tube passage 7, with being fixed on the outside of 1 barrel of lattice cell.It is described be oriented to tube passage 7 quantity and
Position and the quantity and position consistency of the guiding tube passage of upper tube socket.
Outer band 6 is equipped in the outside that lattice cell 1 arranges, the height of outer band 6 is identical with the height of lattice cell 1.
Guide vane 8 is equipped in the top edge and lower edge of outer band 6, prevents fuel assembly mutual hook when assembling
It hangs.
Example IV
Lattice cell 1 is four sides cylinder, and including cylinder angle and barrel, plane is processed at cylinder angle.It is set on the cylinder angle plane of lattice cell 1
Have firm convex 2.
Described firm convex 2 are circle, and to 1 internal protrusion of lattice cell, point contact is formed with fuel element.
Guide surface 4 on inclined is equipped with above described firm convex 2, inclined lower guide surface is equipped in just convex 2 lower section
5, make just convex 2 to seamlessly transit with 1 barrel of lattice cell, convenient fuel element is inserted into.
A kind of lattice cell type spacer grid of fuel assembly, is rearranged by lattice cell 1.The lattice cell 1 connects two-by-two, is formed
The grid spacer of 9x9.
The lattice cell 1 of lattice cell arrangement center is taken out, as instrument tube passage, gauge pipe is set for the position of 1 vacancy of lattice cell
In in instrument tube passage, it is welded and fixed with the barrel lateral surface of lattice cell 1.
Centered on instrument tube passage, several lattice cells 1 of symmetric position are taken out, the position of 1 vacancy of lattice cell, which is used as, leads
To tube passage 7, guide pipe, which is set on, to be oriented in tube passage 7, with being fixed on the outside of 1 barrel of lattice cell.It is described be oriented to tube passage 7 quantity and
Position and the quantity and position consistency of the guiding tube passage of upper tube socket.
Outer band 6 is equipped in the outside that lattice cell 1 arranges, the height of outer band 6 is identical with the height of lattice cell 1.
Guide vane 8 is equipped in the top edge and lower edge of outer band 6, prevents fuel assembly mutual hook when assembling
It hangs.
Embodiment five
Lattice cell 1 is four sides cylinder, and including cylinder angle and barrel, plane is processed at cylinder angle.It is set on the cylinder angle plane of lattice cell 1
Have firm convex 2.
As shown in figure 5, described firm convex 2 be circle, to 1 internal protrusion of lattice cell, point contact is formed with fuel element.
Guide surface 4 on inclined is equipped with above described firm convex 2, inclined lower guide surface is equipped in just convex 2 lower section
5, make just convex 2 to seamlessly transit with 1 barrel of lattice cell, convenient fuel element is inserted into.
Upper convex portion 3 is equipped in the top of upper guide surface 4, in the lower section of lower guide surface 5, is symmetrically equipped with down with upper convex portion 3
Protrusion 9 for controlling coolant flow, and generates cooling agent certain effect of mixing.The upper convex portion 3 and lower protrusion 9
To 1 outside protrusion of lattice cell.Upper convex portion 3 and the protrusion amplitude of lower protrusion 9 are according to the required crossing current mixed of practical cooling agent
And grid spacer can account in fuel assembly flow resistance share limits, required crossing current of mixing is bigger, while can account for
Flow resistance share it is more big, the amplitude protruded is bigger.
A kind of lattice cell type spacer grid of fuel assembly, is rearranged by lattice cell 1.The lattice cell 1 connects two-by-two, is formed
The grid spacer of 5x5.
The lattice cell 1 of lattice cell arrangement center is taken out, as instrument tube passage, gauge pipe is set for the position of 1 vacancy of lattice cell
In in instrument tube passage, it is welded and fixed with the barrel lateral surface of lattice cell 1.
Centered on instrument tube passage, several lattice cells 1 of symmetric position are taken out, the position of 1 vacancy of lattice cell, which is used as, leads
To tube passage 7, guide pipe, which is set on, to be oriented in tube passage 7, with being fixed on the outside of 1 barrel of lattice cell.It is described be oriented to tube passage 7 quantity and
Position and the quantity and position consistency of the guiding tube passage of upper tube socket.
Outer band 6 is equipped in the outside that lattice cell 1 arranges, the height of outer band 6 is identical with the height of lattice cell 1.
Guide vane 8 is equipped in the top edge and lower edge of outer band 6, prevents fuel assembly mutual hook when assembling
It hangs.
Embodiment six
Lattice cell 1 is four sides cylinder, and including cylinder angle and barrel, plane is processed at cylinder angle.It is set on the cylinder angle plane of lattice cell 1
Have firm convex 2.
As shown in fig. 6, described firm convex 2 be ellipse, along the short transverse of lattice cell 1 to 1 inner bulge of lattice cell, with fuel
Element forms line contact.
Inclined lower guide surface 5 is equipped with below described firm convex 2, makes just convex 2 to seamlessly transit with 1 barrel of lattice cell, it is convenient
Fuel element is inserted into.
Upper convex portion 3 is equipped in just convex 2 top, lower protrusion 9 is equipped in the lower section of lower guide surface 5, for controlling cooling agent
Flow, and certain effect of mixing is generated to cooling agent.The upper convex portion 3 and lower protrusion 9 are to 1 outside protrusion of lattice cell.On
The protrusion amplitude of protrusion 3 and lower protrusion 9 is positioned according to the required crossing current mixed of practical cooling agent and in fuel assembly
The flow resistance share that screen work can account for limits, and required crossing current of mixing is bigger, at the same the flow resistance share that can account for more it is big then
The amplitude of protrusion is bigger.
A kind of spacer grid of fuel assembly is rearranged by lattice cell 1.The lattice cell 1 connects two-by-two, forms 15x15's
Grid spacer.
The lattice cell 1 of lattice cell arrangement center is taken out, as instrument tube passage, gauge pipe is set for the position of 1 vacancy of lattice cell
In in instrument tube passage, it is welded and fixed with the barrel lateral surface of lattice cell 1.
Centered on instrument tube passage, several lattice cells 1 of symmetric position are taken out, the position of 1 vacancy of lattice cell, which is used as, leads
To tube passage 7, guide pipe, which is set on, to be oriented in tube passage 7, with being fixed on the outside of 1 barrel of lattice cell.It is described be oriented to tube passage 7 quantity and
Position and the quantity and position consistency of the guiding tube passage of upper tube socket.
Outer band 6 is equipped in the outside that lattice cell 1 arranges, the height of outer band 6 is identical with the height of lattice cell 1.
Guide vane 8 is equipped in the top edge and lower edge of outer band 6, prevents fuel assembly mutual hook when assembling
It hangs.
The utility model fuel assembly for nuclear reactor, including upper tube socket, annular fuel element, bottom nozzle, guide pipe, instrument
Grid spacer described in pipe and any of the above-described embodiment.
Annular fuel element, guide pipe and the gauge pipe is inserted in grid spacer；Grid spacer have it is multiple, successively
It is axially disposed；The upper end of guide pipe and gauge pipe is fixedly connected with upper tube socket, and lower end is fixedly connected with bottom nozzle；
Bottom nozzle is inserted into the lower end of annular fuel element, is fixedly connected with bottom nozzle, when annular fuel element generates irradiation
During growth, expand upwards.
The upper end of tube socket is provided with tube socket holddown spring and upper tube socket dowel hole on described.Upper tube socket holddown spring
There are four altogether, it is separately positioned on the four edges at the top of tube socket, for compressing fuel assembly.Upper tube socket dowel hole shares two
It is a, it is separately positioned on diagonal at the top of tube socket, by realizing the positioning to fuel assembly with bayonet fittings.
Guide pipe mounting hole, the first discharge orifice of bottom nozzle and the bottom nozzle of bottom nozzle are respectively arranged in the upper end of bottom nozzle
Second discharge orifice.The position of the guide pipe mounting hole of bottom nozzle is corresponding with the position of guide pipe, for fixed guide pipe, down tube
The first discharge orifice of seat and the second discharge orifice of bottom nozzle are used to pass through cooling agent.
As shown in fig. 7, the annular fuel element is by upper end plug 10, lower end plug 15, interior involucrum 11, outer envelope 12, pressure
Tight spring 13 and annular fuel pellet 14 form.Outer envelope 12 is on the outside of interior involucrum 11, interior involucrum 11 and outer envelope 12
Side's connection upper end plug 10, the lower end plug 15 of lower section connection.The sky that upper end plug 10, lower end plug 15, interior involucrum 11 and outer envelope 12 form
Chamber is used for accommodating annular fuel pellet 14.
Air cavity 18 is formed between the upper end plug 10 and annular fuel pellet 14, holddown spring is provided in air cavity 18
13,13 one end of holddown spring is withstood on annular fuel pellet 14, and the other end is withstood in upper end plug 10, in the thrust of holddown spring 13
Under effect, annular fuel pellet 14 is pressed on lower end plug 15；Holddown spring 13 provides thrust when transporting fuel, prevents annular
14 play of fuel pellet avoids causing annular fuel pellet 14 damaged.
It is set in the upper end plug 10 of the annular fuel element there are one air-filled pore 17, by air-filled pore 17 to air cavity 18
Helium is inside filled with for heat conduction.
The lower end plug 15 of the annular fuel element is fixed on by eyelets 16 on bottom nozzle.
Annular fuel element, can be before keeping or promoting existing reactor safety nargin as a result of loop configuration
It puts, reactor core output power density is substantially improved, hence it is evident that improve the economy of nuclear power.Under accidental conditions, annular fuel member
Part bulk temperature is far below rod shaped fuel element；Under major accident operating mode, the temperature of annular fuel pellet 14 is low, energy storage is few
Feature can delay the process that fuel element cladding fails, and valuable time is provided for subsequent accident mitigation and emergency response,
Improve the inherent safety of PWR nuclear power plant.Annular fuel element can also reduce the flow resistance of component, the resistance of reactor core
Power reduces, and can effectively reduce the output power of PWR nuclear power plant primary Ioops pump, promotes service life.
Claims (24)
1. a kind of lattice cell, for the grid spacer of fuel assembly for nuclear reactor, it is characterised in that：The lattice cell (1) is four sides
Including cylinder angle and barrel, plane is processed at four cylinder angles respectively for cylinder, is equipped on cylinder angle plane firm convex (2).
2. a kind of lattice cell as described in claim 1, it is characterised in that：Described firm convex (2) are circle, internal to lattice cell (1)
Protrusion forms point contact with fuel element.
3. a kind of lattice cell as described in claim 1, it is characterised in that：Described firm convex (2) are ellipse, along lattice cell (1)
Short transverse forms line with fuel element and contacts to lattice cell (1) inner bulge.
4. a kind of lattice cell as described in claim 1, it is characterised in that：Upper convex portion (3) is equipped in the top of firm convex (2), is used for
Coolant flow is controlled, and the effect of mixing is generated to cooling agent.
5. a kind of lattice cell as claimed in claim 4, it is characterised in that：In the lower section of firm convex (2), with upper convex portion (3) symmetrically
Equipped with lower protrusion (9).
6. a kind of lattice cell as claimed in claim 5, it is characterised in that：The upper convex portion (3) and lower protrusion (9) are to lattice cell
(1) outside protrusion, the protrusion amplitude of upper convex portion (3) and lower protrusion (9) according to the required crossing current mixed of practical cooling agent with
And grid spacer can account in fuel assembly flow resistance share limits, crossing current is bigger for required mixing, while can account for
The flow resistance share the big, and the amplitude protruded is bigger.
7. a kind of lattice cell as described in claim 1, it is characterised in that：It is equipped on inclined and leads above described firm convex (2)
To face (4), firm convex (2) is made to be seamlessly transitted with lattice cell (1) cylinder angle, convenient fuel element is inserted into.
8. a kind of lattice cell as claimed in claim 7, it is characterised in that：Be equipped with below described firm convex (2) it is inclined under lead
To face (5).
9. a kind of spacer grid of fuel assembly, it is characterised in that：It is arranged by such as claim 1~8 any one of them lattice cell (1)
Composition.
10. a kind of spacer grid of fuel assembly as claimed in claim 9, it is characterised in that：(1) two two-phase of lattice cell
It connects, forms the arrangement of N × N.
11. a kind of spacer grid of fuel assembly as claimed in claim 10, it is characterised in that：The two neighboring lattice cell
(1) it is fixed two-by-two by way of in barrel spot welding.
12. a kind of spacer grid of fuel assembly as claimed in claim 11, it is characterised in that：The value range of N is 3~17.
13. a kind of spacer grid of fuel assembly as claimed in claim 12, it is characterised in that：The value of N is 5,7,9,11,
13rd, one in 15.
14. a kind of spacer grid of fuel assembly as claimed in claim 13, it is characterised in that：One during lattice cell (1) is arranged
A lattice cell (1) is taken out, and the position of lattice cell (1) vacancy is as guiding tube passage (7) or instrument tube passage.
15. a kind of spacer grid of fuel assembly as claimed in claim 14, it is characterised in that：The instrument tube passage has one
It is a, positioned at the center that lattice cell (1) is arranged with N × N；Being oriented to tube passage (7) has several, centered on instrument tube passage,
It is symmetrically arranged.
16. a kind of spacer grid of fuel assembly as claimed in claim 15, it is characterised in that：Guide pipe, which is set on, is oriented to tube passage
(7) it in, is welded and fixed with the barrel lateral surface of lattice cell (1).
17. a kind of spacer grid of fuel assembly as claimed in claim 16, it is characterised in that：The guiding tube passage (7)
With quantity, the position consistency of the guiding tube passage of upper tube socket.
18. a kind of spacer grid of fuel assembly as claimed in claim 17, it is characterised in that：Gauge pipe is set on instrument tube passage
It is interior, it is welded and fixed with the barrel lateral surface of lattice cell (1).
19. a kind of spacer grid of fuel assembly as claimed in claim 18, it is characterised in that：In the outside that lattice cell (1) arranges
Equipped with outer band (6), the height of outer band (6) is identical with the height of lattice cell (1).
20. a kind of spacer grid of fuel assembly as claimed in claim 19, it is characterised in that：Top edge in outer band (6)
Guide vane (8) is equipped with lower edge, prevents fuel assembly from being hooked mutually when assembling.
21. a kind of fuel assembly, it is characterised in that：Including grid spacer as claimed in claim 20.
22. a kind of fuel assembly as claimed in claim 21, it is characterised in that：Further include tube socket, annular fuel element, under
Tube socket, guide pipe and gauge pipe；
Annular fuel element, guide pipe and the gauge pipe is inserted in grid spacer；Grid spacer have it is multiple, successively along axis
To setting；The upper end of guide pipe and gauge pipe is fixedly connected with upper tube socket, and lower end is fixedly connected with bottom nozzle；
Bottom nozzle is inserted into the lower end of annular fuel element, is fixedly connected with bottom nozzle, when annular fuel element generates irradiation growth
When, it expands upwards.
23. a kind of fuel assembly as claimed in claim 22, it is characterised in that：The annular fuel element is by upper end plug
(10), lower end plug (15), interior involucrum (11), outer envelope (12), holddown spring (13) and annular fuel pellet (14) composition；
Outer envelope (12) set on the outside of interior involucrum (11), connection upper end plug (10) above interior involucrum (11) and outer envelope (12),
The lower end plug (15) of lower section connection；The cavity that upper end plug (10), lower end plug (15), interior involucrum (11) and outer envelope (12) form is used for
Accommodate annular fuel pellet (14)；
Air cavity (18) is formed between upper end plug (10) and annular fuel pellet (14), holddown spring is provided in air cavity (18)
(13), holddown spring (13) one end is withstood on annular fuel pellet (14), and the other end is withstood in upper end plug (10), in holddown spring
(13) under thrust, annular fuel pellet (14) is pressed on lower end plug (15)；Holddown spring (13) is when transporting fuel
Thrust is provided, prevents annular fuel pellet (14) play, avoids causing annular fuel pellet (14) damaged.
24. a kind of fuel assembly as claimed in claim 23, it is characterised in that：In the upper end plug of the annular fuel element
(10) it is set on there are one air-filled pore (17), helium is filled with for heat conduction into air cavity (18) by air-filled pore (17)；
The lower end plug (15) of the annular fuel element is fixed on by eyelets (16) on bottom nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772730.9U CN207558438U (en) | 2017-12-19 | 2017-12-19 | A kind of lattice cell, spacer grid of fuel assembly and fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772730.9U CN207558438U (en) | 2017-12-19 | 2017-12-19 | A kind of lattice cell, spacer grid of fuel assembly and fuel assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207558438U true CN207558438U (en) | 2018-06-29 |
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ID=62664574
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721772730.9U Expired - Fee Related CN207558438U (en) | 2017-12-19 | 2017-12-19 | A kind of lattice cell, spacer grid of fuel assembly and fuel assembly |
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| Country | Link |
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| CN (1) | CN207558438U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2017
- 2017-12-19 CN CN201721772730.9U patent/CN207558438U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180629 Termination date: 20211219 |