CN207909506U - A kind of annular fuel assembly of square double-sided cooling - Google Patents
A kind of annular fuel assembly of square double-sided cooling Download PDFInfo
- Publication number
- CN207909506U CN207909506U CN201721772938.0U CN201721772938U CN207909506U CN 207909506 U CN207909506 U CN 207909506U CN 201721772938 U CN201721772938 U CN 201721772938U CN 207909506 U CN207909506 U CN 207909506U
- Authority
- CN
- China
- Prior art keywords
- fuel
- foreign matter
- fuel assembly
- fuel rod
- pipe
- 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.)
- Active
Links
Classifications
-
- 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
Landscapes
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The utility model belongs to nuclear fuel assembly technical field, annular fuel assembly is cooled down more particularly to a kind of square double-sided, purpose is a kind of annular fuel assembly of square double-sided cooling 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：It includes 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；The lower end of the fuel rod is vacantly arranged, and is not contacted with bottom nozzle so that when fuel rod generates irradiation growth, fuel rod is expanded to upper and lower ends.The utility model has been obviously improved economy and the safety of nuclear power, and extends nuclear power plant's service life.
Description
Technical field
The utility model belongs to nuclear fuel assembly technical field, and in particular to a kind of annular fuel stack of square double-sided cooling
Part.
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 annular fuel assembly of square double-sided cooling of Development and design, solves existing rodlike
Fuel assembly in use, easy tos produce the increase of fission gas burst size, involucrum corrosion and the increase of suction hydrogen, fuel pellet and swells
The problem of swollen, fuel element and component irradiation growth aggravate.
The technical solution of the utility model is as described below：
A kind of annular fuel assembly of square double-sided cooling, 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 successively in an axial direction
It sets；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：It is described
The lower end of fuel rod be vacantly arranged, do not contacted with bottom nozzle so that when fuel rod generates irradiation growth, fuel rod is to upper and lower
Both ends expand.
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 also uses the spread pattern of 13 × 13-8-1, including 160
Fuel rod, eight guide pipes and a gauge pipe；Eight 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 also uses the spread pattern of 13 × 13-4-1, including 164
Root 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 also uses the spread pattern of 17 × 17-4-1, including 284
Root 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 it is 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 with and combustion
The position of charge bar is corresponding.
The upper end of bottom nozzle as described above is respectively arranged with the guide pipe mounting hole of bottom nozzle, the first discharge orifice of bottom nozzle
With the second discharge orifice of bottom nozzle；The position of the guide pipe mounting hole of bottom nozzle is corresponding with the position of guide pipe, is led for fixation
Xiang Guan, the first discharge orifice of bottom nozzle and the second discharge orifice of bottom nozzle are for passing through coolant.
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；Second holddown spring is mounted on pellet upper end, provides and pushes away in transport
Power prevents pellet play, avoids causing fuel pellet damaged.
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 framework rolls over 90 °, radius bend 30mm~60mm upwards, the side with bottom nozzle
It is threadedly coupled, the anti-foreign matter screen frame body is formed by slab overall processing, thickness 3mm~8mm, is set on the anti-foreign matter screen frame body
It is equipped 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 hanging, when fuel rod generates irradiation growth, fuel rod can be to upper and lower
Both ends expand, and when avoiding the fixation of fuel rod lower end, fuel rod easily causes phase between fuel rod and grid spacer to unilateral side growth
It is excessive to moving displacement, it is scratched to lead to the problem of fuel rod.By between the setting minimum between two consecutive fuel sticks
Gap, while making the centre-to-centre spacing between fuel rod and adjacent guide pipe equal with the centre-to-centre spacing between adjacent two fuel rods, it can
So that the runner of coolant is more uniformly distributed, the Temperature Distribution in component is more average.The utility model additionally provides a kind of stream
Logical area is big, and manufacture difficulty is small, manufacturing process simple structure intensity it is big be suitable for the anti-different of annular fuel component bottom device
The circulation area of object modular construction, the bottom nozzle of circulation area foreign matter net more anti-than existing band is big by 0.6%, effectively reduces this reality
With the pressure drop of novel bottom nozzle.
Description of the drawings
Fig. 1 is a kind of front view of the annular fuel assembly of square double-sided cooling of the utility model；
Fig. 2 is a kind of viewgraph of cross-section of the annular fuel assembly of square double-sided cooling of the utility model；
Fig. 3 is a kind of structural schematic diagram of the upper tube socket of the annular fuel assembly of square double-sided cooling of the utility model；
Fig. 4 is a kind of grid spacer of the annular fuel assembly of square double-sided cooling of the utility model；
Fig. 5 is the partial enlarged view of Fig. 4；
Fig. 6 is a kind of structural schematic diagram of the bottom nozzle of the annular fuel assembly of square double-sided cooling of the utility model；
Fig. 7 is a kind of front view of the fuel rod of the annular fuel assembly of square double-sided cooling of the utility model；
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, 12. the first discharge orifices of bottom nozzle, 13. the second discharge orifices of bottom nozzle, 14. outer envelopes, 15.
Pellet, involucrum in 16., 17. upper end plugs, 18. second holddown springs, 19. times end plugs, 20. side opening, 21. anti-foreign matter plate muscles,
22. anti-foreign matter framework, 23. anti-foreign matter nets.
Specific implementation mode
The utility model is described further with reference to the accompanying drawings and examples.
As depicted in figs. 1 and 2, a kind of annular fuel assembly of square double-sided cooling, including upper tube socket 1, fuel rod 2, positioning
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 grid spacer 3.Positioning
Screen work 3 shares multiple, sets gradually in an axial direction.The upper end of guide pipe 5 and gauge pipe 6 is fixedly connected with upper tube socket 1, lower end with
Bottom nozzle 4 is fixedly connected.The lower end of fuel rod 2 is vacantly arranged, and is not contacted with bottom nozzle 4 so that when fuel rod generates irradiation life
When long, fuel rod can be expanded to upper and lower ends.
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, guide pipe mounting hole 11, the bottom nozzle that the upper end of bottom nozzle 4 is respectively arranged with bottom nozzle are first-class
Water hole 12 and the second discharge orifice of bottom nozzle 13.The position of the guide pipe mounting hole 11 of bottom nozzle is corresponding with the position of guide pipe 5,
For fixed guide pipe 5, the first discharge orifice of bottom nozzle 12 and the second discharge orifice of bottom nozzle 13 are for passing through coolant.
As shown in Figure 7 and Figure 8, the generally cyclic structure of fuel rod 2, outermost layer are outer envelope 14, and innermost layer is interior involucrum
16, it is pellet 15 between outer envelope 14 and interior involucrum 16.Between outer envelope 14 and pellet 15, pellet 15 and interior involucrum 16
Between be both provided with gap, it is convenient for assembly.Interior involucrum 16 connects upper end plug 17, interior involucrum with 14 top of outer envelope by argon arc welding
16 connect down end plug 19 with 14 lower section of outer envelope by argon arc welding.Two side opening 20 are symmetrical arranged in upper end plug 17 so that cold
But agent can enter the hollow duct that interior 16 inner wall of involucrum is constituted by these side opening 20, be carried out to integral ring-shaped fuel rod cold
But.Second holddown spring 18 is mounted on 15 upper end of pellet, and providing thrust in transport prevents pellet play, avoids causing cartridge
Block is damaged.Fuel rod 2 as a result of loop configuration, can under the premise of keeping or promoting existing reactor safety nargin,
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 bulk temperature
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 delay fuel
The process of cladding failure, provides valuable time for subsequent accident mitigation and emergency response, improves compressed water reactor nuclear power
The inherent safety of factory.Annular fuel can also reduce the flow resistance of component, and the resistance of reactor core reduces, and can effectively reduce pressure
The output power of water-water reactor nuclear power plant primary Ioops pump, promotes service life.
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 21, anti-foreign matter framework 22 and prevents
Foreign matter net 23.
Four side of edge part of the anti-foreign matter screen frame body 22 rolls over 90 °, radius bend 30mm~60mm upwards, with bottom nozzle 4
Side be threadedly coupled, the anti-foreign matter screen frame body 22 forms by slab overall processing, thickness 3mm~8mm, the anti-foreign matter
The anti-foreign matter plate muscle 21 that several parallel intervals are arranged in framework is provided on screen frame body 22, anti-foreign matter plate muscle 21 is provided with screw thread
Hole.
The anti-foreign matter net 23 is fitted on anti-22 lower face of foreign matter screen frame body, and four side of edge part of anti-foreign matter net 23 is upward
90 ° of folding, fits with four sides of the edge part of anti-foreign matter framework 22, forms four side flexure plane of edge part.
Be evenly equipped on the anti-foreign matter net 23 with the matched trepanning of anti-21 upper screwed hole of foreign matter plate muscle, anti-foreign matter net 23 with
Anti- foreign matter plate muscle 21 is spirally connected；The anti-foreign matter net 23 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 23 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 22 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 22, 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 23 are also equipped with groove, are matched with the groove size in anti-foreign matter framework 22.
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 (19)
1. a kind of annular fuel assembly of square double-sided cooling, including upper tube socket (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) are inserted in grid spacer (3)；It is fixed
Position screen work (3) is shared multiple, sets gradually in an axial direction；The upper end of guide pipe (5) and gauge pipe (6) and the fixed company of upper tube socket (1)
It connects, lower end is fixedly connected with bottom nozzle (4)；It is characterized in that：The lower end of the fuel rod (2) is vacantly arranged, not with down tube
Seat (4) contact so that when fuel rod generates irradiation growth, fuel rod is expanded to upper and lower ends.
2. the annular fuel assembly of square double-sided cooling according to claim 1, it is characterised in that：The grid spacer
(3) eight to ten three are shared, is set gradually in an axial direction.
3. the annular fuel assembly of square double-sided cooling according to claim 2, it is characterised in that：The grid spacer
(3) 11 are shared；Grid spacer (3) keeps fuel rod spacing for fuel rod to be fixed.
4. the annular fuel assembly of square double-sided cooling according to claim 1, it is characterised in that：The fuel assembly
Fuel rod (2) uses 5 × 5 to 17 × 17 spread pattern.
5. the annular fuel assembly of square double-sided cooling according to claim 4, it is characterised in that：The fuel assembly
Fuel rod (2) uses the spread pattern of 5 × 5-4-1, including 20 fuel rods (2), four guide pipes (5) and an instrument
It manages (6)；Four guide pipes (5) are in 1/8th equivalent arrangements, and gauge pipe (6) is located at center.
6. the annular fuel assembly of square double-sided cooling according to claim 4, it is characterised in that：The fuel assembly
Fuel rod (2) also use 13 × 13-8-1 spread pattern, including 160 fuel rods (2), eight guide pipes (5) and
A piece gauge pipe (6)；Eight guide pipes (5) are in 1/8th equivalent arrangements, and gauge pipe (6) is located at center.
7. the annular fuel assembly of square double-sided cooling according to claim 4, it is characterised in that：The fuel assembly
Fuel rod (2) also uses the spread pattern of 13 × 13-4-1, including 164 fuel rods (2), four guide pipes (5)
With a gauge pipe (6)；Four guide pipes (5) are in 1/8th equivalent arrangements, and gauge pipe (6) is located at center.
8. the annular fuel assembly of square double-sided cooling according to claim 4, it is characterised in that：The fuel assembly
Fuel rod (2) 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, and gauge pipe (6) is located at center.
9. the annular fuel assembly of square double-sided cooling according to claim 4, it is characterised in that：The fuel assembly
Fuel rod (2) uses the spread pattern of 17 × 17-8-1, including 280 fuel rods (2), eight guide pipes (5) and one
Root gauge pipe (6)；Eight guide pipes (5) are in 1/8th equivalent arrangements, and gauge pipe (6) is located at center.
10. the annular fuel assembly of square double-sided cooling according to claim 4, it is characterised in that：The fuel assembly
Fuel rod (2) also use 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, and gauge pipe (6) is located at center.
11. the annular fuel assembly of square double-sided cooling according to claim 4, it is characterised in that：The fuel assembly
Fuel rod (2) use the spread pattern of 17 × 17-12-1, including 270 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, and gauge pipe (6) is located at center.
12. the annular fuel assembly of square double-sided cooling according to claim 4, it is characterised in that：Described two are adjacent
Minimum clearance between fuel rod (2) is 0.7 to 3.5mm；Centre-to-centre spacing and phase between fuel rod (2) and adjacent guide pipe (5)
Centre-to-centre spacing between adjacent two fuel rods (2) is equal.
13. the annular fuel assembly of square double-sided cooling according to claim 12, it is characterised in that：Described two are adjacent
Minimum clearance between fuel rod (2) is 2mm.
14. the annular fuel assembly of square double-sided cooling according to claim 1, it is characterised in that：The upper tube socket (1)
Upper end is provided with the first holddown spring (7) and upper tube socket dowel hole (8)；There are four first holddown spring (7) is total, it is respectively set
On the four edges at the top of upper tube socket (1), for compressing fuel assembly；There are two upper tube socket dowel hole (8) is total, it is respectively set
On diagonal at the top of the upper tube socket (1), pass through the positioning realized with bayonet fittings to fuel assembly.
15. the annular fuel assembly of square double-sided cooling according to claim 2, it is characterised in that：The grid spacer
(3) it is provided with grid spacer and guide pipe contact surface (9) and grid spacer and fuel rod contact surface (10) on, is respectively used to leading
It is positioned to pipe (5) and fuel rod (2)；The grid with grid spacer and guide pipe contact surface (9) in grid spacer (3)
Position it is corresponding with the position of guide pipe (5), the position of the grid with grid spacer and fuel rod contact surface (10) with and
The position of fuel rod (2) is corresponding.
16. the annular fuel assembly of square double-sided cooling according to claim 2, it is characterised in that：The bottom nozzle (4)
Upper end be respectively arranged with the second flowing water of guide pipe mounting hole (11), the first discharge orifice of bottom nozzle (12) and bottom nozzle of bottom nozzle
Hole (13)；The position of the guide pipe mounting hole (11) of bottom nozzle is corresponding with the position of guide pipe (5), is used for fixed guide pipe
(5), the first discharge orifice of bottom nozzle (12) and the second discharge orifice of bottom nozzle (13) are for passing through coolant.
17. the annular fuel assembly of square double-sided cooling according to claim 2, it is characterised in that：The fuel rod (2)
Generally cyclic structure, outermost layer are outer envelope (14), and innermost layer is interior involucrum (16), in outer envelope (14) and interior involucrum (16)
Between be pellet (15)；Between outer envelope (14) and pellet (15), between being both provided between pellet (15) and interior involucrum (16)
Gap, it is convenient for assembly；Upper end plug (17) connect by argon arc welding above interior involucrum (16) and outer envelope (14), interior involucrum (16) and outside
Lower end plug (19) is connected by argon arc welding below involucrum (14)；Two side opening (20) are symmetrical arranged in upper end plug (17) so that
Coolant can enter the hollow duct that interior involucrum (16) inner wall is constituted by these side opening (20), to integral ring-shaped fuel rod
It is cooled down；Second holddown spring (18) is mounted on pellet (15) upper end, and providing thrust in transport prevents pellet play, avoids
Cause fuel pellet damaged.
18. the annular fuel assembly of square double-sided cooling according to claim 1, it is characterised in that：The upper tube socket (1)
It is made of stainless steel with bottom nozzle (4), involucrum, grid spacer (3), guide pipe (5) and the gauge pipe of fuel rod (2)
(6) it is made of Zirconium alloy material.
19. the annular fuel assembly of square double-sided cooling according to claim 16, it is characterised in that：It further includes anti-foreign matter
Component, be integrally square structure, is arranged between bottom nozzle (4) lower surface and bottom nozzle (4) supporting leg；The anti-foreign matter component
Including anti-foreign matter plate muscle (21), anti-foreign matter framework (22) and anti-foreign matter net (23)；
Four side of edge part of the anti-foreign matter framework (22) rolls over 90 °, radius bend 30mm~60mm upwards, with bottom nozzle (4)
Side is threadedly coupled, and the anti-foreign matter screen frame body (22) is formed by slab overall processing, thickness 3mm~8mm, the anti-foreign matter net
The anti-foreign matter plate muscle (21) that several parallel intervals are arranged in framework is provided in framework (22), anti-foreign matter plate muscle (21) is provided with
Threaded hole；
The anti-foreign matter net (23) is fitted on anti-foreign matter screen frame body (22) lower face, four side of edge part of anti-foreign matter net (23) to
Upper 90 ° of folding, fits with four sides of the edge part of anti-foreign matter screen frame body (22), forms four side flexure plane of edge part；
It is evenly equipped on the anti-foreign matter net (23) and the matched trepanning of anti-foreign matter plate muscle (21) upper screwed hole, anti-foreign matter net (23)
It is spirally connected with anti-foreign matter plate muscle (21)；The anti-foreign matter net (23) further includes multiple filter hole units；The anti-foreign matter net (23) 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 (22) is fluted, four supporting legs of the groove size fitting bottom nozzle (4)；
Four angles of the anti-foreign matter net (23) are also equipped with groove, are matched with the groove size on anti-foreign matter framework (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772938.0U CN207909506U (en) | 2017-12-19 | 2017-12-19 | A kind of annular fuel assembly of square double-sided cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772938.0U CN207909506U (en) | 2017-12-19 | 2017-12-19 | A kind of annular fuel assembly of square double-sided cooling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207909506U true CN207909506U (en) | 2018-09-25 |
Family
ID=63568231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721772938.0U Active CN207909506U (en) | 2017-12-19 | 2017-12-19 | A kind of annular fuel assembly of square double-sided cooling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207909506U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935361A (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 square double-sided |
-
2017
- 2017-12-19 CN CN201721772938.0U patent/CN207909506U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935361A (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 square double-sided |
| CN109935361B (en) * | 2017-12-19 | 2024-05-31 | 中国原子能科学研究院 | Square double-sided cooling annular fuel assembly |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109935349A (en) | A kind of cooling annular fuel assembly of the fixed square double-sided in fuel rod lower end | |
| CN101252025B (en) | Heavy water stack cobalt regulating rod component | |
| US8594269B2 (en) | Nuclear fuel assemblies with structural support replacement rods | |
| JP5968782B2 (en) | Plutonium-How to operate a pressurized water reactor to reach an equilibrium cycle | |
| CN207895852U (en) | A kind of fixed annular fuel assembly of square double-sided cooling in fuel rod lower end | |
| CN114220558B (en) | Fuel assembly grid, fuel assembly and pressurized water reactor core | |
| WO2016119292A1 (en) | Flow distribution device and nuclear reactor assembly with same | |
| CN207909506U (en) | A kind of annular fuel assembly of square double-sided cooling | |
| CN101178947B (en) | Boron carbide shielding assembly | |
| CN206148144U (en) | Lead base fast reactor quadrangle fuel assembly and fast neutron reactor who is used for thereof | |
| CN103390434B (en) | A kind of novel fine rod tight lattice nuclear reactor | |
| CN207731667U (en) | A kind of two-sided cooling annular fuel rod of dismountable segmented | |
| CN110867261B (en) | Multi-type pellet mixed loading metal cooling reactor and management method | |
| CN207731666U (en) | A kind of two-sided cooling annular fuel assembly of hexagon | |
| CN207909505U (en) | A kind of two-sided cooling annular fuel assembly being provided with periphery protection structure | |
| CZ229293A3 (en) | Fuel system containing deflecting blades for deflecting a component of a liquid component passing along such fuel system | |
| CN207731671U (en) | A kind of two-sided cooling annular fuel rod with wrapping wire | |
| CN207731665U (en) | A kind of fixed two-sided cooling annular fuel rod in lower end | |
| CN109935348A (en) | A kind of two-sided cooling annular fuel assembly being provided with periphery protection structure | |
| CN208767029U (en) | A kind of fuel assembly and its bottom nozzle and bottom device | |
| CN109935354A (en) | A kind of two-sided cooling annular fuel assembly of hexagon | |
| CN109935361A (en) | A kind of cooling annular fuel assembly of square double-sided | |
| CN109935369B (en) | Cell, fuel assembly positioning grid and fuel assembly | |
| CN212135973U (en) | Grid cell type positioning grid with turbulence wings | |
| CN207731669U (en) | A kind of spacer grid of fuel assembly and fuel assembly with angle plug-in unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |