CN107610786A - Fuel assembly and its bottom nozzle - Google Patents
Fuel assembly and its bottom nozzle Download PDFInfo
- Publication number
- CN107610786A CN107610786A CN201710908222.7A CN201710908222A CN107610786A CN 107610786 A CN107610786 A CN 107610786A CN 201710908222 A CN201710908222 A CN 201710908222A CN 107610786 A CN107610786 A CN 107610786A
- Authority
- CN
- China
- Prior art keywords
- bottom nozzle
- connecting plate
- fuel assembly
- supporting construction
- supporting
- 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.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 32
- 238000010276 construction Methods 0.000 claims abstract description 39
- 239000012530 fluid Substances 0.000 abstract description 7
- 238000003801 milling Methods 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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
- Gas Burners (AREA)
Abstract
The invention discloses a kind of fuel assembly and its bottom nozzle, bottom nozzle includes connecting plate, several supporting legs and supporting construction；Several supporting leg intervals are connected to below the connecting plate, and the supporting construction is connected to the lower section of the connecting plate between several supporting legs.The present invention sets supporting construction on connecting plate, while reducing bottom nozzle stress, reducing bottom nozzle regional fluid pressure drop coefficient, improves the dimensional stability of bottom nozzle；By reducing bottom nozzle connecting plate stress level, slot milling is improved for hydraulic performance so that the flow field in bottom nozzle above fuel bundle area is more uniform, and the Flow vibration for advantageously reducing fuel rod lower end is horizontal.
Description
Technical field
The present invention relates to fuel assembly for nuclear reactor technical field, more particularly to a kind of fuel assembly and its bottom nozzle.
Background technology
Existing bottom nozzle undertakes all load of fuel assembly, and passes to connecting plate by guide pipe junction, passes through
Connecting plate passes to four supporting legs, then to lower core plate, causes local stress at connecting plate big, to intensity requirement height.
In addition, in existing bottom nozzle, because fluid (cooling agent) from lower four spray-holes of core plate enters bottom nozzle chamber
Afterwards, four fluid streams converge experience sudden expansion sudden contraction process in bottom nozzle bottom, have larger fluid pressure loss coefficient.
The content of the invention
The technical problem to be solved in the present invention is, there is provided one kind reduces bottom nozzle stress, reduces bottom nozzle regional fluid
The pressure loss, improve bottom nozzle dimensional stability fuel assembly bottom nozzle and with the bottom nozzle fuel assembly.
The technical solution adopted for the present invention to solve the technical problems is：A kind of bottom nozzle of fuel assembly is provided, including
Connecting plate, several supporting legs and supporting construction；Several supporting leg intervals are connected to below the connecting plate, the support
Structure is connected to the lower section of the connecting plate between several supporting legs.
Preferably, the supporting construction is continuous decussate texture or the decussate texture of interruption.
Preferably, the supporting construction includes one or more support members.
Preferably, multiple support members are connected or are spaced scattered.
Preferably, the longitudinal section shape of the support member is at least one of rectangle, trapezoidal, taper and abnormity.
Preferably, the lateral cross section of the support member is shaped as at least one of rectangle, cross, circle and abnormity.
Preferably, the bottom surface of the supporting construction is concordant with the bottom surface of the supporting leg.
Preferably, the connecting plate is provided with the through hole of several through connection plate upper and lower surfaces；The supporting construction is in institute
State and avoid the through hole below connecting plate.
Preferably, the supporting construction is located at the middle part of the connecting plate, and extends to the periphery of the connecting plate.
Preferably, the bottom nozzle also includes shirt rim；The shirt rim is connected to below the connecting plate and adjacent described
Between supporting leg.
The present invention also provides a kind of fuel assembly, including the bottom nozzle described in any of the above item.
Beneficial effects of the present invention：Supporting construction is set on connecting plate, bottom nozzle stress is being reduced, is reducing bottom nozzle area
While the fluid pressure loss coefficient of domain, the dimensional stability of bottom nozzle is improved；By reducing bottom nozzle connecting plate stress level,
Slot milling is improved for hydraulic performance so that the flow field in bottom nozzle above fuel bundle area is more uniform, advantageously reduces fuel
The Flow vibration of rod lower end is horizontal.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the structural representation of the bottom nozzle of first embodiment of the invention；
Fig. 2 is cross-sectional view of the bottom nozzle shown in Fig. 1 along line A-A；
Fig. 3 is the structural representation of the bottom nozzle of second embodiment of the invention；
Fig. 4 is the structural representation of the bottom nozzle of third embodiment of the invention；
Fig. 5 is cross-sectional view of the bottom nozzle shown in Fig. 4 along line B-B；
Fig. 6 is the cross-sectional view of the bottom nozzle of fourth embodiment of the invention.
Embodiment
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now compares accompanying drawing and describe in detail
The embodiment of the present invention.
As shown in Figure 1, 2, the bottom nozzle of the fuel assembly of first embodiment of the invention, it may include connecting plate 10, Shuo Gezhi
Support leg 20 and supporting construction 30.Several intervals of supporting leg 20 are connected to the lower section of connecting plate 10, and supporting construction 30 is in several supports
The lower section of connecting plate 10 is connected between leg 20.
The setting that the bottom nozzle passes through supporting construction 30 so that the load that bottom nozzle undertakes by supporting leg 20 except being transmitted
Outside, lower core plate can also be passed to by supporting construction 30, solves the problems, such as stress raisers, reduce bottom nozzle connection
The stress level of plate 10, improve bottom nozzle bulk strength.
Wherein, it is in cross that supporting construction 30 is overall.The criss-cross supporting construction 30 is located at the middle part of connecting plate 10, and
Extend to the periphery of connecting plate 10.
Generally, bottom nozzle includes four supporting legs 20, respectively positioned at four diagonal angles of connecting plate 10.Supporting construction 30 exists
The middle part of connecting plate 10 lower section is simultaneously extended between the adjacent supporting leg 20 of each two, is equally played a supporting role with supporting leg 20.
The bottom surface of supporting construction 30 is concordant with the bottom surface of supporting leg 20.
In the present embodiment, supporting construction 30 is a continuous decussate texture, and it is below connecting plate 10 by connecting plate
The space of 10 lower sections is separated into four chambers.Four chambers can under face core plate porch four entrances, it is cold by preventing
But invalid traffic distribution of the agent between chamber can improve the assignment of traffic uniformity of bottom nozzle porch, by preventing cooling agent
Invalid turbulent flow between chamber can reduce bottom nozzle pressure drop coefficient.
Connecting plate 10 is provided with the through hole 11 of several upper and lower surfaces of through connection plate 10.In fuel assembly, through hole 11 1
The grafting that part is used for guide pipe positions, and a part is used to circulate for the longitudinal direction of fluid such as cooling agent.Supporting construction 30 is connecting
Avoid through hole 11 in the lower section of plate 10.
It is to be appreciated that the supporting construction 30 in the present embodiment may include one or more support members 31, for a branch
Support member 31, overall is in cross (in transverse direction)；For multiple support members 31, it is connected to form decussate texture.
The longitudinal cross-section of support member 31 can be it is variously-shaped, such as at least one in rectangle, trapezoidal, taper and abnormity
Kind.The lateral cross section shape of support member 31 can also be it is variously-shaped, as be rectangle, cross, circle and abnormity at least
It is a kind of.
Again as shown in figure 1, in the present embodiment, the longitudinal cross-section of support member 31 is rectangle.
As shown in figure 3, the bottom nozzle of the fuel assembly of second embodiment of the invention, including connecting plate 10, several supporting legs
20 and supporting construction 30.Several intervals of supporting leg 20 are connected to the lower section of connecting plate 10, and supporting construction 30 is in several supporting legs 20
Between be connected to the lower section of connecting plate 10.
The present embodiment is unlike first embodiment：The longitudinal cross-section of the support member 31 of supporting construction 30 is trapezoidal.
It is to be appreciated that trapezoidal trapezoid or inverted trapezoidal for shown in Fig. 3.
As shown in Figure 4,5, the bottom nozzle of the fuel assembly of third embodiment of the invention, including connecting plate 10, several supports
Leg 20 and supporting construction 30.Several intervals of supporting leg 20 are connected to the lower section of connecting plate 10, and supporting construction 30 is in several supporting legs
The lower section of connecting plate 10 is connected between 20.
In the present embodiment, supporting construction 30 is the decussate texture of interruption.
Specifically, the supporting construction 30 includes multiple support members 31, and multiple support members 31 are below connecting plate 10 along cross
Shape scattering device.At least one support member 31 is connected to the middle part of connecting plate 10, and other support members 31 can be between supporting leg 20
It is connected to the periphery of connecting plate 10.
In the present embodiment, the lateral cross section of support member 31 at the middle part of connecting plate 10 is in cross, other shapes of support member 31
Shape is unlimited, and on the bearing of trend of cross support member 31, larger interruption decussate texture is formed with it.
As shown in fig. 6, the bottom nozzle of the fuel assembly of fourth embodiment of the invention, supporting construction 30 is the cross of interruption
Structure.
Supporting construction 30 includes multiple support members 31, and multiple support members 31 are set below connecting plate 10 along cross is scattered
Put.At least one support member 31 is connected to the middle part of connecting plate 10, and other support members 31 can be connected between supporting leg 20
The periphery of fishplate bar 10.
Unlike 3rd embodiment：The lateral cross section of support member 31 at the middle part of connecting plate 10 is rounded, others branch
The shape of support member 31 is unlimited, and on four bearing of trends of circular shaped support 31, larger interruption decussate texture is formed with it.
Further, as shown in Fig. 1,3,4, bottom nozzle of the invention also includes shirt rim 40.Shirt rim 40 is connected to connecting plate
Between 10 lower sections and adjacent supporting leg 20.
Shirt rim 40 is set respectively backwards to the side lower end of supporting construction 30, supporting leg 20 backwards to the side lower end of supporting construction 30
There is chamfering.
In addition, in the bottom nozzle of the present invention, supporting construction 30, supporting leg 20 may be integrally formed on connecting plate 10,
Can be to be connected as one after split settings.
The fuel assembly of the present invention, including above-mentioned first embodiment any bottom nozzle into fourth embodiment.Fuel stack
Part also includes several fuel rods, grid spacer, guide pipe, upper base etc., can use prior art to realize.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of bottom nozzle of fuel assembly, it is characterised in that including connecting plate（10）, several supporting legs（20）And support knot
Structure（30）；Several supporting legs（20）Interval is connected to the connecting plate（10）Lower section, the supporting construction（30）In several
The supporting leg（20）Between be connected to the connecting plate（10）Lower section.
2. the bottom nozzle of fuel assembly according to claim 1, it is characterised in that the supporting construction（30）To be continuous
The decussate texture of decussate texture or interruption.
3. the bottom nozzle of fuel assembly according to claim 2, it is characterised in that the supporting construction（30）Including one
Or multiple support members（31）.
4. the bottom nozzle of fuel assembly according to claim 3, it is characterised in that multiple support members（31）It is connected
Or interval is scattered.
5. the bottom nozzle of fuel assembly according to claim 3, it is characterised in that the support member（31）Longitudinal cross-section
It is shaped as at least one of rectangle, trapezoidal, taper, streamlined and abnormity；
The support member（31）Lateral cross section be shaped as at least one of rectangle, cross, circle and abnormity.
6. the bottom nozzle of fuel assembly according to claim 1, it is characterised in that the supporting construction（30）Bottom surface with
The supporting leg（20）Bottom surface it is concordant.
7. the bottom nozzle of fuel assembly according to claim 1, it is characterised in that the connecting plate（10）It is provided with several
Through connection plate（10）The through hole of upper and lower surface（11）；The supporting construction（30）In the connecting plate（10）Avoid described in lower section
Through hole（11）.
8. the bottom nozzle of fuel assembly according to claim 1, it is characterised in that the supporting construction（30）Positioned at described
Connecting plate（10）Middle part, and to the connecting plate（10）Periphery extension.
9. the bottom nozzle of the fuel assembly according to claim any one of 1-8, it is characterised in that the bottom nozzle also includes
Shirt rim（40）；The shirt rim（40）It is connected to the connecting plate（10）Lower section and the adjacent supporting leg（20）Between.
10. a kind of fuel assembly, it is characterised in that including the bottom nozzle described in claim any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710908222.7A CN107610786A (en) | 2017-09-29 | 2017-09-29 | Fuel assembly and its bottom nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710908222.7A CN107610786A (en) | 2017-09-29 | 2017-09-29 | Fuel assembly and its bottom nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107610786A true CN107610786A (en) | 2018-01-19 |
Family
ID=61068533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710908222.7A Pending CN107610786A (en) | 2017-09-29 | 2017-09-29 | Fuel assembly and its bottom nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107610786A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061675A (en) * | 1990-11-20 | 1992-06-03 | 法玛通公司 | The filtering bottom nozzle that is used for fuel assembly of lightwater-cooled nuclear reactor |
| JPH05341069A (en) * | 1992-06-11 | 1993-12-24 | Nuclear Fuel Ind Ltd | Lower nozzle for pwr fuel assembly |
| JPH11109074A (en) * | 1997-10-06 | 1999-04-23 | Mitsubishi Heavy Ind Ltd | Reactor fuel assembly and its lower nozzle |
| US20110158372A1 (en) * | 2008-11-28 | 2011-06-30 | Mitsubishi Heavy Industries, Ltd. | Shock-absorbing device for fuel assembly and fuel assembly housing container |
| CN103337262A (en) * | 2013-06-18 | 2013-10-02 | 中国核动力研究设计院 | A kind of bottom nozzle with filtration foreign matter function |
| WO2016201680A1 (en) * | 2015-06-18 | 2016-12-22 | 中科华核电技术研究院有限公司 | Nozzle unit of fuel assembly |
| CN207397726U (en) * | 2017-09-29 | 2018-05-22 | 岭东核电有限公司 | Fuel assembly and its bottom nozzle |
-
2017
- 2017-09-29 CN CN201710908222.7A patent/CN107610786A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061675A (en) * | 1990-11-20 | 1992-06-03 | 法玛通公司 | The filtering bottom nozzle that is used for fuel assembly of lightwater-cooled nuclear reactor |
| JPH05341069A (en) * | 1992-06-11 | 1993-12-24 | Nuclear Fuel Ind Ltd | Lower nozzle for pwr fuel assembly |
| JPH11109074A (en) * | 1997-10-06 | 1999-04-23 | Mitsubishi Heavy Ind Ltd | Reactor fuel assembly and its lower nozzle |
| US20110158372A1 (en) * | 2008-11-28 | 2011-06-30 | Mitsubishi Heavy Industries, Ltd. | Shock-absorbing device for fuel assembly and fuel assembly housing container |
| CN103337262A (en) * | 2013-06-18 | 2013-10-02 | 中国核动力研究设计院 | A kind of bottom nozzle with filtration foreign matter function |
| WO2016201680A1 (en) * | 2015-06-18 | 2016-12-22 | 中科华核电技术研究院有限公司 | Nozzle unit of fuel assembly |
| CN207397726U (en) * | 2017-09-29 | 2018-05-22 | 岭东核电有限公司 | Fuel assembly and its bottom nozzle |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |