CN207895852U - A kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end - Google Patents
A kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end Download PDFInfo
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- CN207895852U CN207895852U CN201721772939.5U CN201721772939U CN207895852U CN 207895852 U CN207895852 U CN 207895852U CN 201721772939 U CN201721772939 U CN 201721772939U CN 207895852 U CN207895852 U CN 207895852U
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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 belongs to nuclear fuel assembly technical field, more particularly to a kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end, purpose is a kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end of Development and design, solve the problem of that existing rod shape fuel component easy tos produce the increase of fission gas burst size, involucrum corrosion and inhales hydrogen increase, fuel pellet swelling, fuel element and the aggravation of component irradiation growth in use.It is characterized in that：Including upper tube socket, fuel rod, grid spacer, bottom nozzle, guide pipe and gauge pipe；Fuel rod, guide pipe and gauge pipe are inserted in grid spacer；Grid spacer shares multiple, sets gradually in an axial direction；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；It is characterized in that：Bottom nozzle is inserted into the lower end of the fuel rod, is fixedly connected with bottom nozzle；When fuel rod generates irradiation growth, fuel rod expands upwards.
Description
Technical field
The utility model belongs to nuclear fuel assembly technical field, and in particular to a kind of fixed square double-sided in fuel rod lower end
Cooling annular fuel assembly.
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 status very outstanding always in the world, by optimizing fuel element design, using
The methods of advanced configuration material, improvement component manufacturing process, are continuously improved the various performances of nuclear fuel element, promote nuclear power to more
Safe and more economical direction is developed.
Full property and economy are the bases of nuclear power developing, and almost all of nuclear power technology development is all to increase Nuclear Safety
It is target with economy.Fuel element as nuclear power plant's reactor core component, performance be Nuclear Safety and economy most
One of major influence factors, therefore the research of fuel element is placed on status very outstanding always in the world, it is fired by optimizing
Expect element design, using the methods of advanced configuration material, improvement component manufacturing process, the various property of nuclear fuel element are continuously improved
Can, promote nuclear power to develop to safer and more economical direction.
At present PWR nuclear power plant generally use rod shape fuel, can by deepen component discharge burn-up, extend the refulling cycle,
Power plant's operation cost is reduced, economics in nuclear power is improved.The average design burnup of PWR fuel assembly from the 10 of early stage~
15GWd/tU is stepped up, and has reached 60~70GWd/tU so far, and the refulling cycle also correspondingly extended to from 12 months present
18 or 24 months.Fuel-assembly burn-up intensification also brings such as increase of fission gas burst size, involucrum corrosion and inhales hydrogen increase, combustion
Expect a series of problems, such as pellet swelling, fuel element and component irradiation growth aggravate.How to solve these problems are always the world
The vital task of PWR Fuel element research, for example, the advanced involucrum that research and development corrosion resistance is good, is released using low fission gas
Put the pellet of rate.In addition, by improving grid spacer design, increases the approach such as component critical heat flux density, also improve reaction
The overall security of heap reactor core.Generally speaking, rod shape fuel modular construction and parameter be nearly 50 years develop continue to optimize as a result,
Technological improvement based on rod shape fuel is very limited for the potentiality for promoting economics in nuclear power and safety, therefore, closely
Over a little years, a kind of new thinking of development is become using the fuel element of other geometries.
Following five basic demands are at least met for the fuel element of new geometric structure：1) " the table of fuel can be improved
Area/volume " compares；2) pellet thickness can be reduced；3) there is enough rigidity；4) reactor core pressure drop can be reduced；5) component will have open type
Grid design.The light water reactor that Massachusetts Institute Technology the proposes earliest concept of annular fuel element, meets well
State 5 requirements.So-called annular fuel is that ring-type is made in fuel pellet, installs cladding tubes additional in pellet inner and outer surfaces so that cooling
Agent can cool down element compared with traditional solid cylindrical fuel simultaneously from inside and outside two runners, annular fuel
Benefit is under very high linear density, and the temperature of Central Fuel is still very low, and the energy storage in fuel is less, fission gas release
It is less.Fuel performance is preferable under expectable normal operation and transient condition.
Annular fuel can increase substantially the biography of fuel element as the advanced fuel element reformed completely in a kind of structure
The thermal efficiency reduces fuel pellet temperature, can be obviously improved safety and the economy of reactor, it has also become presurized water reactor advanced fuel
One of important trend of component is paid close attention to by industry in the world.Beautiful, Han Deng states have carried out annular fuel in succession
Research and development, research shows that annular fuel has good application prospect.
Utility model content
The purpose of this utility model is that a kind of fixed square double-sided in fuel rod lower end of Development and design cools down annular fuel
Component solves existing rod shape fuel component in use, easy tos produce the increase of fission gas burst size, involucrum corrosion and inhales
The problem of hydrogen increase, fuel pellet swelling, fuel element and component irradiation growth aggravate.
The technical solution of the utility model is as described below：
A kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end, including upper tube socket, fuel rod, positioning lattice
Frame, bottom nozzle, guide pipe and gauge pipe；Fuel rod, guide pipe and gauge pipe are inserted in grid spacer；Grid spacer is shared more
It is a, it sets gradually in an axial direction；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；
It is characterized in that：Bottom nozzle is inserted into the lower end of the fuel rod, is fixedly connected with bottom nozzle, when fuel rod generates irradiation growth
When, fuel rod expands upwards；The fuel rod uses annular fuel.
Grid spacer as described above shares eight to ten three, sets gradually in an axial direction.
Grid spacer as described above shares 11；Grid spacer keeps fuel for fuel rod to be fixed
Stick spacing.
The fuel rod of fuel assembly as described above uses 5 × 5 to 17 × 17 spread pattern.
The fuel rod of fuel assembly as described above uses the spread pattern of 5 × 5-4-1, including 20 fuel rods,
Four guide pipes and a gauge pipe；Four guide pipes are in 1/8th equivalent arrangements, and gauge pipe is located at center.
The fuel rod of fuel assembly as described above uses the spread pattern of 13 × 13-8-1, including 160 combustions
Charge bar, eight guide pipes and a gauge pipe；Eight guide pipes are in 1/8th equivalent arrangements, and gauge pipe is located at center.
The fuel rod of fuel assembly as described above uses the spread pattern of 13 × 13-4-1, including 164
Fuel rod, four guide pipes and a gauge pipe；Four guide pipes are in 1/8th equivalent arrangements, and gauge pipe is located at centre bit
It sets.
The fuel rod of fuel assembly as described above uses the spread pattern of 13 × 13-12-1, including 156
Root fuel rod, 12 guide pipes and a gauge pipe；12 guide pipes are in 1/8th equivalent arrangements, during gauge pipe is located at
Heart position.
The fuel rod of fuel assembly as described above uses the spread pattern of 17 × 17-8-1, including 280 combustions
Charge bar, eight guide pipes and a gauge pipe；Eight guide pipes are in 1/8th equivalent arrangements, and gauge pipe is located at center.
The fuel rod of fuel assembly as described above uses the spread pattern of 17 × 17-4-1, including 284
Fuel rod, four guide pipes and a gauge pipe；Four guide pipes are in 1/8th equivalent arrangements, and gauge pipe is located at centre bit
It sets.
The fuel rod of fuel assembly as described above uses the spread pattern of 17 × 17-12-1, including 276
Root fuel rod, 12 guide pipes and a gauge pipe；12 guide pipes are in 1/8th equivalent arrangements, during gauge pipe is located at
Heart position.
Minimum clearance between two consecutive fuel sticks as described above is 0.7 to 3.5mm；Fuel rod and adjacent guide pipe
Between centre-to-centre spacing should be equal with the centre-to-centre spacing between adjacent two fuel rods.
Minimum clearance between two consecutive fuel sticks as described above is 2mm.
Upper tube socket upper end is provided with the first holddown spring and upper tube socket dowel hole as described above；First holddown spring is total
There are four, 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, passes through the positioning realized with bayonet fittings to fuel assembly.
Grid spacer is provided on grid spacer as described above to connect with fuel rod with guide pipe contact surface and grid spacer
Contacting surface is respectively used to position guide pipe and fuel rod；There is grid spacer and guide pipe contact surface in grid spacer
Grid position it is corresponding with the position of guide pipe, the position of the grid with grid spacer and fuel rod contact surface and fuel
The position of stick is corresponding.
The upper end of bottom nozzle as described above is respectively arranged with the fuel rod peace of the guide pipe mounting hole of bottom nozzle, bottom nozzle
Fill hole, the first discharge orifice of bottom nozzle, the second discharge orifice of bottom nozzle and bottom nozzle third discharge orifice；The guide pipe mounting hole of bottom nozzle
Position it is corresponding with the position of guide pipe, be used for fixed guide pipe；The position of the charge bar mounting hole of bottom nozzle and fuel rod
Position is corresponding, is used for fixed fuel stick；The first discharge orifice of bottom nozzle, the second discharge orifice of bottom nozzle and bottom nozzle third discharge orifice
For passing through coolant.
There are sufficient spaces for installing anti-foreign matter structure or device for the lower end of bottom nozzle as described above.
Fuel rod generally cyclic structure as described above, outermost layer are outer envelope, and innermost layer is interior involucrum, in outer envelope
It is pellet between interior involucrum；It is both provided with gap between outer envelope and pellet, between pellet and interior involucrum, it is convenient for assembly；
Interior involucrum connects upper end plug with above outer envelope by argon arc welding, and interior involucrum connects lower end with below outer envelope by argon arc welding
Plug；Two side opening are symmetrical arranged in upper end plug so that coolant can be made up of these side opening into interior involucrum inner wall
Hollow duct, integral ring-shaped fuel rod is cooled down；The annular fuel rod is fixed on down tube by eyelets
On seat；The eyelets upper end spiral is connected to the outer surface of lower end plug；Eyelets lower end spiral is fastened on down
On tube socket；Second holddown spring is mounted on pellet upper end, and providing thrust in transport prevents pellet play, avoids causing pellet broken
Damage；One air-filled pore is set in upper end plug, is used to accommodate pellet by what the inside involucrum of the air-filled pore and outer envelope were nested to form
Cavity in pour helium.
Upper tube socket and bottom nozzle are made of stainless steel as described above, the involucrum of fuel rod, grid spacer, guiding
Pipe and gauge pipe are made of Zirconium alloy material.
The utility model further includes anti-foreign matter component, and be integrally square structure, is arranged in bottom nozzle lower surface and bottom nozzle
Between supporting leg；The anti-foreign matter component includes anti-foreign matter plate muscle, anti-foreign matter framework and anti-foreign matter net；
Four side of edge part of the anti-foreign matter screen frame body rolls over 90 °, radius bend 30mm~60mm upwards, the side with bottom nozzle
Side is threadedly coupled, and the anti-foreign matter screen frame body is formed by slab overall processing, thickness 3mm~8mm, in the anti-foreign matter framework
It is provided with the anti-foreign matter plate muscle that several parallel intervals are arranged in framework, anti-foreign matter plate muscle is provided with threaded hole；
The anti-foreign matter net is fitted on anti-foreign matter screen frame body lower face, and four side of edge part of anti-foreign matter net rolls over 90 ° upwards,
It fits with four sides of the edge part of anti-foreign matter screen frame body, forms four side flexure plane of edge part；
The anti-foreign matter is evenly equipped with and the anti-matched trepanning of foreign matter plate muscle upper screwed hole, anti-foreign matter net and anti-foreign matter on the net
Plate muscle is spirally connected；The anti-foreign matter net further includes multiple filter hole units；The anti-foreign matter net is formed by thin plate overall processing, thickness
The length of side of 0.8mm~3mm, the filter hole unit are set as 0.15~0.35mm；
Four angles setting of the anti-foreign matter framework is fluted, four supporting legs of the groove size fitting bottom nozzle；
Four angles of the anti-foreign matter net are also equipped with groove, are matched with the groove size in anti-foreign matter framework.
The utility model has the beneficial effects that：
The utility model uses annular fuel, can be under the premise of keeping or promoting existing reactor safety nargin, greatly
Width promotes reactor core output power density, hence it is evident that improves the economy of nuclear power.Under accidental conditions, ring-type element bulk temperature is remote
Less than rod type element；Under major accident operating mode, the feature that the temperature of annular fuel pellet is low, energy storage is few can delay fuel first
The process of part involucrum failure, provides valuable time for subsequent accident mitigation and emergency response, improves PWR nuclear power plant
Inherent safety.Annular fuel can also reduce the flow resistance of component, and the resistance of reactor core reduces, and can effectively drop low pressure water
The output power of heap nuclear power plant primary Ioops pump, promotes service life.By the way that side opening is arranged in fuel rod upper end plug so that cooling
Agent can enter the hollow duct that interior involucrum inner wall is constituted by these side opening, be cooled down to integral ring-shaped fuel rod, greatly
Improve cooling efficiency greatly.By using 13 × 13 to 17 × 17 fuel rod square arrangement form, it is easy for existing large size
Pressurized water reactor core so that the resistance of component itself reduces, and promotes the flow velocity for the coolant for flowing through component, greatly promotes cooling effect
Fruit reduces the temperature of component.By using 8 to 13 layers of grid spacer, fuel rod can be clamped, fuel rod is fixed, and
Keep fuel rod spacing so that fuel rod is located at fixed position in the reactor core of PWR nuclear power plant, and can be so that guide pipe
By cross-brace and positioning.Since fuel rod lower end is fixed with bottom nozzle, hanging type fuel rod is avoided when by longer
Between when irradiating, grid spacer chucking power reduces, and fuel rod is caused to fall.Since end plug is located at end with interior involucrum weld seam under fuel rod
Portion, commissure can hit bottom nozzle when fuel rod falls, and easily causing welding seam failure causes fuel rod damaged.Using fuel rod lower end
Stationary structure avoids the above problem.Simultaneously because fuel rod lower end is fixed, grid spacer be not necessarily to for fuel rod provide compared with
Big chucking power avoids the excessive fuel rod clad damage caused in fuel rod assembling process of grid spacer chucking power, also
The structure of grid spacer can be allow to design relatively simple, significantly reduce the manufacturing cost of fuel assembly.Pass through
Setting minimum clearance between two consecutive fuel sticks, while making centre-to-centre spacing and phase between fuel rod and adjacent guide pipe
Centre-to-centre spacing between adjacent two fuel rods is equal, the runner of coolant can be made to be more uniformly distributed, the Temperature Distribution in component is more
It is average.The utility model additionally provides that a kind of circulation area is big, and manufacture difficulty is small, big suitable of manufacturing process simple structure intensity
For the anti-foreign matter modular construction of annular fuel component bottom device, the bottom nozzle of circulation area foreign matter net more anti-than existing band
Circulation area is big by 0.6%, effectively reduces the pressure drop of the utility model bottom nozzle.
Description of the drawings
Fig. 1 is a kind of main view of the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end of the utility model
Figure；
Fig. 2 is a kind of cross section of the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end of the utility model
View；
Fig. 3 is a kind of upper tube socket of the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end of the utility model
Structural schematic diagram；
Fig. 4 is a kind of positioning lattice of the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end of the utility model
Frame；
Fig. 5 is the partial enlarged view of Fig. 4；
Fig. 6 is a kind of bottom nozzle of the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end of the utility model
Structural schematic diagram；
Fig. 7 is a kind of fuel rod of the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end of the utility model
Front view；
Fig. 8 is the section view of Fig. 7；
Fig. 9 is a kind of structural representation of the anti-foreign matter component of the annular fuel assembly of square double-sided cooling of the utility model
Figure.
Wherein：Tube socket on 1., 2. fuel rods, 3. grid spacers, 4. bottom nozzles, 5. guide pipes, 6. gauge pipes, 7. first
Holddown spring, tube socket dowel hole on 8., 9. grid spacers and guide pipe contact surface, 10. grid spacers and fuel rod contact surface,
11. the guide pipe mounting hole of bottom nozzle, the fuel rod mounting hole of 12. bottom nozzles, 13. the first discharge orifices of bottom nozzle, 14. down tubes
The second discharge orifice of seat, 15. bottom nozzle third discharge orifices, 16. outer envelopes, 17. pellets, involucrum in 18., 19. upper end plugs, 20. the
Two holddown springs, 21. times end plugs, 22. eyelets, 23. side opening, 24. anti-foreign matter plate muscles, 25. anti-foreign matter frameworks, 26.
Anti- foreign matter net.
Specific implementation mode
The utility model is described further with reference to the accompanying drawings and examples.
As depicted in figs. 1 and 2, the fixed annular fuel assembly of square double-sided cooling in a kind of fuel rod lower end, including upper tube
Seat 1, fuel rod 2, grid spacer 3, bottom nozzle 4, guide pipe 5 and gauge pipe 6.Fuel rod 2, guide pipe 5 and gauge pipe 6 plug
In grid spacer 3.Grid spacer 3 shares multiple, sets gradually in an axial direction.The upper end of guide pipe 5 and gauge pipe 6 and upper tube socket
1 is fixedly connected, and lower end is fixedly connected with bottom nozzle 4.Bottom nozzle 4 is inserted into the lower end of fuel rod 2, is fixedly connected with bottom nozzle 4, when
When fuel rod generates irradiation growth, fuel rod expands upwards.Fuel rod 2 uses annular fuel.
The grid spacer 3 shares eight to ten three, sets gradually in an axial direction.Preferably, grid spacer 3 shares ten
One.Grid spacer 3 keeps fuel rod spacing for fuel rod to be fixed so that fuel rod is in PWR nuclear power plant
Reactor core in be located at fixed position, and can make guide pipe by cross-brace and positioning.
5 × 5 to 17 × 17 spread pattern may be used in the fuel rod 2 of the fuel assembly.Using above-mentioned arrangement shape
Formula can make the resistance of component itself reduce, and promote the flow velocity for the coolant for flowing through component, greatly promote cooling effect, reduce
The temperature of component.
The fuel rod 2 of the fuel assembly uses the spread pattern of 5 × 5-4-1, including 20 fuel rods 2, four
Root guide pipe 5 and a gauge pipe 6.Four guide pipes 5 are in 1/8th equivalent arrangements, and gauge pipe 6 is located at center.
As shown in Fig. 2, the fuel rod 2 of the fuel assembly can also use the spread pattern of 13 × 13-8-1, packet
Include 160 fuel rods, 2, eight guide pipes 5 and a gauge pipe 6.Eight guide pipes 5 are in 1/8th equivalent arrangements,
Gauge pipe 6 is located at center.
The fuel rod 2 of the fuel assembly can also use the spread pattern of 13 × 13-4-1, including 160
Four fuel rods, 2, four guide pipes 5 and a gauge pipe 6.Four guide pipes 5 are in 1/8th equivalent arrangements, gauge pipe 6
In center.
The fuel rod 2 of the fuel assembly can also use the spread pattern of 13 × 13-12-1, including 150
2,12 guide pipes 5 of six roots of sensation fuel rod and a gauge pipe 6.12 guide pipes 5 are in 1/8th equivalent arrangements, gauge pipe
6 are located at center.
The fuel rod 2 of the fuel assembly can also use the spread pattern of 17 × 17-8-1, including 280
2, eight guide pipes 5 of root fuel rod and a gauge pipe 6.Eight guide pipes 5 are in 1/8th equivalent arrangements, and gauge pipe 6 is located at
Center.
The fuel rod 2 of the fuel assembly can also use the spread pattern of 17 × 17-4-1, including 280
Four fuel rods, 2, four guide pipes 5 and a gauge pipe 6.Four guide pipes 5 are in 1/8th equivalent arrangements, gauge pipe 6
In center.
The fuel rod 2 of the fuel assembly can also use the spread pattern of 17 × 17-12-1, including 270
2,12 guide pipes 5 of six roots of sensation fuel rod and a gauge pipe 6.12 guide pipes 5 are in 1/8th equivalent arrangements, gauge pipe
6 are located at center.
In the fuel assembly of above-mentioned various spread patterns, minimum clearance between two consecutive fuel sticks 2 be 0.7 to
3.5mm, it is preferred to use 2mm.During centre-to-centre spacing between fuel rod 2 and adjacent guide pipe 5 should be between adjacent two fuel rods 2
The heart is away from equal.The runner of coolant can be made to be more uniformly distributed by above structure setting, the Temperature Distribution in component is more flat
.
As shown in figure 3,1 upper end of upper tube socket is provided with the first holddown spring 7 and upper tube socket dowel hole 8.First compresses bullet
There are four spring 7 is total, it is separately positioned on the four edges at 1 top of tube socket, for compressing fuel assembly.Upper tube socket dowel hole 8
There are two altogether, be separately positioned on the top of tube socket 1 it is diagonal on, pass through the positioning realized with bayonet fittings to fuel assembly.
As shown in Figure 4 and Figure 5, grid spacer and guide pipe contact surface 9 and grid spacer and combustion are provided on grid spacer 3
Charge bar contact surface 10 is respectively used to position guide pipe 5 and fuel rod 2.There is grid spacer and lead in grid spacer 3
Position to the grid of pipe contact surface 9 is corresponding with the position of guide pipe 5, the grid with grid spacer and fuel rod contact surface 10
The position of lattice is corresponding with the position of fuel rod 2.
As shown in fig. 6, the upper end of bottom nozzle 4 is respectively arranged with the fuel of the guide pipe mounting hole 11 of bottom nozzle, bottom nozzle
Stick mounting hole 12, the first discharge orifice of bottom nozzle 13, the second discharge orifice of bottom nozzle 14 and bottom nozzle third discharge orifice 15.Bottom nozzle
The position of guide pipe mounting hole 11 is corresponding with the position of guide pipe 5, is used for fixed guide pipe 5.The charge bar mounting hole of bottom nozzle
12 position is corresponding with the position of fuel rod 2, is used for fixed fuel stick 2.The first discharge orifice of bottom nozzle 13, bottom nozzle second
Water hole 14 and bottom nozzle third discharge orifice 15 are for passing through coolant.The lower end of bottom nozzle 4 there are sufficient space for install it is anti-
Foreign matter structure or device.
As shown in Figure 7 and Figure 8, the generally cyclic structure of fuel rod 2, outermost layer are outer envelope 16, and innermost layer is interior involucrum
18, it is pellet 17 between outer envelope 16 and interior involucrum 18.Between outer envelope 16 and pellet 17, pellet 17 and interior involucrum 18
Between be both provided with gap, it is convenient for assembly.Interior involucrum 18 connects upper end plug 19, interior involucrum with 16 top of outer envelope by argon arc welding
18 connect down end plug 21 with 16 lower section of outer envelope by argon arc welding.Two side opening 23 are symmetrical arranged in upper end plug 19 so that cold
But agent can enter the hollow duct that interior 18 inner wall of involucrum is constituted by these side opening 23, be carried out to integral ring-shaped fuel rod cold
But.The annular fuel rod is fixed on by eyelets 22 on bottom nozzle 4；The 22 upper end spiral of eyelets connects
It is connected on the outer surface of lower end plug 21；22 lower end spiral of eyelets is fastened on bottom nozzle 4.Second holddown spring 20 is pacified
Mounted in 17 upper end of pellet, in transport, offer thrust prevents 17 play of pellet, avoids causing pellet 17 damaged.In upper end plug 19
One air-filled pore is set, the cavity for accommodating pellet 17 being nested to form by the inside involucrum 18 of the air-filled pore and outer envelope 16
Inside pour helium.Fuel rod 2, 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, ring-type element is whole
Temperature is far below rod type element；Under major accident operating mode, the feature that the temperature of annular fuel pellet is low, energy storage is few can prolong
The process of slow fuel element cladding failure, provides valuable time for subsequent accident mitigation and emergency response, improves pressure water
The inherent safety of heap nuclear power plant.Annular fuel can also reduce the flow resistance of component, and the resistance of reactor core reduces, can be effective
The output power of PWR nuclear power plant primary Ioops pump is reduced, service life is promoted.
In the present embodiment, upper tube socket 1 and bottom nozzle 4 are made of stainless steel, involucrum, the positioning lattice of fuel rod 2
Frame 3, guide pipe 5 and gauge pipe 6 are made of Zirconium alloy material.
Preferably, as shown in figure 9, the utility model further includes anti-foreign matter component, be integrally square structure, is arranged in down tube
Between 4 lower surfaces of seat and 4 supporting leg of bottom nozzle.The anti-foreign matter component includes anti-foreign matter plate muscle 24, anti-foreign matter framework 25 and prevents
Foreign matter net 26.
Four side of edge part of the anti-foreign matter screen frame body 25 rolls over 90 °, radius bend 30mm~60mm upwards, with bottom nozzle 4
Side be threadedly coupled, the anti-foreign matter screen frame body 25 forms by slab overall processing, thickness 3mm~8mm, the anti-foreign matter
The anti-foreign matter plate muscle 24 that several parallel intervals are arranged in framework is provided in framework 25, anti-foreign matter plate muscle 24 is provided with screw thread
Hole.
The anti-foreign matter net 26 is fitted on anti-25 lower face of foreign matter screen frame body, and four side of edge part of anti-foreign matter net 26 is upward
90 ° of folding, fits with four sides of the edge part of anti-foreign matter screen frame body 25, forms four side flexure plane of edge part.
Be evenly equipped on the anti-foreign matter net 26 with the matched trepanning of anti-24 upper screwed hole of foreign matter plate muscle, anti-foreign matter net 26 with
Anti- foreign matter plate muscle 24 is spirally connected；The anti-foreign matter net 26 further includes multiple filter hole units, and the filter hole cell orifice may be configured as
Rectangular, round or regular hexagon structure.The anti-foreign matter net 26 is formed by thin plate overall processing, thickness 0.8mm~3mm, described
The length of side of filter hole unit may be configured as 0.15~0.35mm.
Four angles setting of the anti-foreign matter framework 25 is fluted, four supporting legs of the groove size fitting bottom nozzle 4.
It can also be designed to various shapes for the structure of the anti-foreign matter screen frame body 25, such as：It is trapezoidal etc., and there is sufficiently large intensity, it can hold
By coolant shock loading.
Four angles of the anti-foreign matter net 26 are also equipped with groove, are matched with the groove size in anti-foreign matter framework 25.
The implementation of the utility model is explained in detail above in conjunction with embodiment, but the utility model and unlimited
In above-described embodiment, within the knowledge of a person skilled in the art, the utility model can also not departed from
Various changes can be made under the premise of objective.Existing skill may be used in the content not being described in detail in the utility model specification
Art.
Claims (20)
1. a kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end, including it is upper tube socket (1), fuel rod (2), fixed
Position screen work (3), bottom nozzle (4), guide pipe (5) and gauge pipe (6)；Fuel rod (2), guide pipe (5) and gauge pipe (6) are inserted in
In grid spacer (3)；Grid spacer (3) is shared multiple, sets gradually in an axial direction；The upper end of guide pipe (5) and gauge pipe (6) with
Upper tube socket (1) is fixedly connected, and lower end is fixedly connected with bottom nozzle (4)；Bottom nozzle (4) is inserted into the lower end of fuel rod (2), with down tube
Seat (4) is fixedly connected, and when fuel rod generates irradiation growth, fuel rod expands upwards；It is characterized in that：The fuel rod
(2) annular fuel is used.
2. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 1, it is characterised in that：
The grid spacer (3) shares eight to ten three, sets gradually in an axial direction.
3. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 2, it is characterised in that：
The grid spacer (3) shares 11；Grid spacer (3) keeps fuel rod spacing for fuel rod to be fixed.
4. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 1, it is characterised in that：
The fuel rod (2) of the fuel assembly uses 5 × 5 to 17 × 17 spread pattern.
5. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, it is characterised in that：
The fuel rod (2) of the fuel assembly use 5 × 5-4-1 spread pattern, including 20 fuel rods (2), four lead
To pipe (5) and a gauge pipe (6)；Four guide pipes (5) are in 1/8th equivalent arrangements, and gauge pipe (6) is located at center.
6. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, it is characterised in that：
The fuel rod (2) of the fuel assembly use 13 × 13-8-1 spread pattern, including 160 fuel rods (2),
Eight guide pipes (5) and a gauge pipe (6)；Eight guide pipes (5) are in 1/8th equivalent arrangements, during gauge pipe (6) is located at
Heart position.
7. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, it is characterised in that：
The fuel rod (2) of the fuel assembly uses the spread pattern of 13 × 13-4-1, including 164 fuel rods
(2), four guide pipes (5) and a gauge pipe (6)；Four guide pipes (5) are in 1/8th equivalent arrangements, gauge pipe (6) position
In center.
8. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, it is characterised in that：
The fuel rod (2) of the fuel assembly uses the spread pattern of 13 × 13-12-1, including 150 six roots of sensation fuel rods
(2), 12 guide pipes (5) and a gauge pipe (6)；12 guide pipes (5) are in 1/8th equivalent arrangements, gauge pipe
(6) it is located at center.
9. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, it is characterised in that：
The fuel rod (2) of the fuel assembly use 17 × 17-8-1 spread pattern, including 280 fuel rods (2),
Eight guide pipes (5) and a gauge pipe (6)；Eight guide pipes (5) are in 1/8th equivalent arrangements, during gauge pipe (6) is located at
Heart position.
10. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, feature exist
In：The fuel rod (2) of the fuel assembly uses the spread pattern of 17 × 17-4-1, including 284 fuel rods
(2), four guide pipes (5) and a gauge pipe (6)；Four guide pipes (5) are in 1/8th equivalent arrangements, gauge pipe (6) position
In center.
11. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, feature exist
In：The fuel rod (2) of the fuel assembly uses the spread pattern of 17 × 17-12-1, including 270 six roots of sensation fuel
Stick (2), 12 guide pipes (5) and a gauge pipe (6)；12 guide pipes (5) are in 1/8th equivalent arrangements, gauge pipe
(6) it is located at center.
12. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, feature exist
In：Minimum clearance between two adjacent fuel rods (2) is 0.7 to 3.5mm；Fuel rod (2) and adjacent guide pipe (5)
Between centre-to-centre spacing should be equal with the centre-to-centre spacing between adjacent two fuel rods (2).
13. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 12, feature exist
In：Minimum clearance between two consecutive fuel sticks (2) is 2mm.
14. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 1, feature exist
In：Described upper tube socket (1) upper end is provided with the first holddown spring (7) and upper tube socket dowel hole (8)；First holddown spring
(7) it there are four altogether, is separately positioned on the four edges at the top of tube socket (1), for compressing fuel assembly；Upper tube socket dowel hole
(8) it there are two altogether, is separately positioned on diagonal at the top of tube socket (1), by determining fuel assembly with bayonet fittings realization
Position.
15. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, feature exist
In：Grid spacer and guide pipe contact surface (9) and grid spacer and fuel rod contact surface are provided on the grid spacer (3)
(10), it is respectively used to position guide pipe (5) and fuel rod (2)；There is grid spacer and be oriented in grid spacer (3)
The position of the grid of pipe contact surface (9) is corresponding with the position of guide pipe (5), has grid spacer and fuel rod contact surface (10)
Grid position it is corresponding with the position of fuel rod (2).
16. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 4, feature exist
In：The upper end of the bottom nozzle (4) is respectively arranged with the fuel rod installation of the guide pipe mounting hole (11) of bottom nozzle, bottom nozzle
Hole (12), the first discharge orifice of bottom nozzle (13), the second discharge orifice of bottom nozzle (14) and bottom nozzle third discharge orifice (15)；Bottom nozzle
Guide pipe mounting hole (11) position it is corresponding with the position of guide pipe (5), be used for fixed guide pipe (5)；The material of bottom nozzle
The position of stick mounting hole (12) is corresponding with the position of fuel rod (2), is used for fixed fuel stick (2)；The first discharge orifice of bottom nozzle
(13), the second discharge orifice of bottom nozzle (14) and bottom nozzle third discharge orifice (15) are for passing through coolant.
17. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 16, feature exist
In：There are sufficient spaces for installing anti-foreign matter structure or device for the lower end of the bottom nozzle (4).
18. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 1, feature exist
In：Fuel rod (2) the generally cyclic structure, outermost layer are outer envelope (16), and innermost layer is interior involucrum (18), in outsourcing
It is pellet (17) between shell (16) and interior involucrum (18)；Between outer envelope (16) and pellet (17), pellet (17) and interior involucrum
(18) gap is both provided between, it is convenient for assembly；Interior involucrum (18) connects upper end plug with above outer envelope (16) by argon arc welding
(19), interior involucrum (18) connects down end plug (21) with below outer envelope (16) by argon arc welding；It is symmetrical arranged in upper end plug (19)
Two side opening (23) so that coolant can enter the hollow flow that interior involucrum (18) inner wall is constituted by these side opening (23)
Road cools down integral ring-shaped fuel rod；The annular fuel rod is fixed on bottom nozzle (4) by eyelets (22)
On；Eyelets (22) upper end spiral is connected to the outer surface of lower end plug (21)；Eyelets (22) lower end spiral connects
It connects and is fixed on bottom nozzle (4)；Second holddown spring (20) is mounted on pellet (17) upper end, and providing thrust in transport prevents core
Block (17) play avoids causing pellet (17) damaged；One air-filled pore is set in upper end plug (19), is inwardly wrapped by the air-filled pore
Helium is poured in the cavity for accommodating pellet (17) that shell (18) and outer envelope (16) are nested to form.
19. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 1, feature exist
In：The upper tube socket (1) and bottom nozzle (4) is made of stainless steel, the involucrum of fuel rod (2), grid spacer (3),
Guide pipe (5) and gauge pipe (6) are made of Zirconium alloy material.
20. the fixed annular fuel assembly of square double-sided cooling in fuel rod lower end according to claim 17, feature exist
In：It further includes anti-foreign matter component, and be integrally square structure, setting bottom nozzle (4) lower surface and bottom nozzle (4) supporting leg it
Between；The anti-foreign matter component includes anti-foreign matter plate muscle (24), anti-foreign matter framework (25) and anti-foreign matter net (26)；
Four side of edge part of the anti-foreign matter screen frame body (25) rolls over 90 °, radius bend 30mm~60mm upwards, with bottom nozzle (4)
Side be threadedly coupled, the anti-foreign matter screen frame body (25) forms by slab overall processing, thickness 3mm~8mm, the anti-foreign matter
The anti-foreign matter plate muscle (24) that several parallel intervals are arranged in framework is provided in framework (25), anti-foreign matter plate muscle (24) is provided with
Threaded hole；
The anti-foreign matter net (26) is fitted on anti-foreign matter screen frame body (25) lower face, four side of edge part of anti-foreign matter net (26) to
Upper 90 ° of folding, fits with four sides of the edge part of anti-foreign matter screen frame body (25), forms four side flexure plane of edge part；
It is evenly equipped on the anti-foreign matter net (26) and the matched trepanning of anti-foreign matter plate muscle (24) upper screwed hole, anti-foreign matter net (26)
It is spirally connected with anti-foreign matter plate muscle (24)；The anti-foreign matter net (26) further includes multiple filter hole units；The anti-foreign matter net (26) by
Thin plate overall processing forms, and thickness 0.8mm~3mm, the length of side of the filter hole unit is set as 0.15~0.35mm；
Four angles setting of the anti-foreign matter framework (25) is fluted, four supporting legs of the groove size fitting bottom nozzle (4)；
Four angles of the anti-foreign matter net (26) are also equipped with groove, are matched with the groove size on anti-foreign matter framework (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772939.5U CN207895852U (en) | 2017-12-19 | 2017-12-19 | A kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772939.5U CN207895852U (en) | 2017-12-19 | 2017-12-19 | A kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end |
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| Publication Number | Publication Date |
|---|---|
| CN207895852U true CN207895852U (en) | 2018-09-21 |
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ID=63549112
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| CN201721772939.5U Active CN207895852U (en) | 2017-12-19 | 2017-12-19 | A kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935349A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of cooling annular fuel assembly of the fixed square double-sided in fuel rod lower end |
| WO2024125080A1 (en) * | 2022-12-12 | 2024-06-20 | 中广核研究院有限公司 | Bottom pipe base of nuclear fuel assembly capable of limiting vibration of fuel rods |
-
2017
- 2017-12-19 CN CN201721772939.5U patent/CN207895852U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935349A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of cooling annular fuel assembly of the fixed square double-sided in fuel rod lower end |
| CN109935349B (en) * | 2017-12-19 | 2024-07-19 | 中国原子能科学研究院 | Square double-sided cooling annular fuel assembly with fixed lower end of fuel rod |
| WO2024125080A1 (en) * | 2022-12-12 | 2024-06-20 | 中广核研究院有限公司 | Bottom pipe base of nuclear fuel assembly capable of limiting vibration of fuel rods |
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