CN203070777U - Low-pressure-drop anti-foreign matter fuel component lower pipe base - Google Patents
Low-pressure-drop anti-foreign matter fuel component lower pipe base Download PDFInfo
- Publication number
- CN203070777U CN203070777U CN2013200168643U CN201320016864U CN203070777U CN 203070777 U CN203070777 U CN 203070777U CN 2013200168643 U CN2013200168643 U CN 2013200168643U CN 201320016864 U CN201320016864 U CN 201320016864U CN 203070777 U CN203070777 U CN 203070777U
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- plate
- foreign matter
- bottom nozzle
- fuel assembly
- pressure drop
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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 provides a low-pressure-drop anti-foreign matter fuel component lower pipe base. The fuel component lower pipe base comprises a support framework and a lower pipe base grid plate fixed under the support framework, wherein the lower pipe base grid plate comprises two layers of plates; one layer of plate is a large-hole plate, and the other layer of plate is a grid plate formed above or under the large-hole plate; the grid plate is in a mesh-shaped grid structure formed by vertical thin sheets; the large-hole plate is in a flat structure coincident to the grid plate in size; a plurality of rows and lines of large and small drain holes are uniformly formed in the large-hole plate; each large circular drain hole is divided into a plurality of parts via grids of the grid plate on an overlook projection; and the position of each large circular drain hole is kept away from a protection position of a fuel rod. Through the match of the large-hole plate and the grid plate, the fuel component lower pipe base has the functions of uniformly distributing flow and implementing the balance among the strength of the lower pipe base, the pressure drop and the foreign matter preventing function. By adopting the structure of the grid plate, the fuel component lower pipe base can still sufficiently filter foreign matters after the hole diameter is enlarged.
Description
Technical field
The utility model relates to the fuel assembly technology, is specifically related to the anti-foreign matter fuel assembly bottom nozzle of a kind of low pressure drop.
Background technology
Fuel assembly is the critical component of nuclear reactor, and it produces heat energy and gives cooling medium with this thermal energy transfer.Bottom nozzle is positioned at fuel assembly bottom, is fuel assembly bottom interface and support component, for the fuel assembly lower end provides laterally and axial location, bears the total weight of fuel assembly and from the load of fuel assembly inside, in-pile component and associated component.Bottom nozzle still is the entrance that cooling medium enters reactor core simultaneously, cooling medium is played the effect of assignment of traffic.
At present main PWR fuel assembly all adopts the bottom nozzle that has anti-foreign matter function in the world, prevents that the big foreign matter of size from entering fuel assembly inside, is hooked on the screen work and washes away swing with cooling medium, causes the fuel rod clad abrasion damaged.Except anti-foreign matter function, when guaranteeing that bottom nozzle intensity, fatigue meet the demands and possesses sufficient assignment of traffic ability, should reduce its resistance coefficient during the bottom nozzle design, to guarantee that the whole pressure drop control of fuel assembly is within tolerance interval as far as possible.
Anti-foreign matter bottom nozzle DFBN with the AP1000 of Westinghouse Electric type fuel assembly is example, as shown in Figure 1, employing has the bottom nozzle lattice plate dispense flow rate of uniform small sircle hole, the foreign matter size that can pass through by limited aperture, by optimizing pass, the Venturi tube structure that adopts the two chamferings of entrance to export single chamfering reduces the pressure drop of bottom nozzle simultaneously.
Summary of the invention
The purpose of this utility model is to provide a kind of low pressure drop to prevent foreign matter fuel assembly bottom nozzle, it namely possesses the basic assignment of traffic of bottom nozzle, supporting and locating functions, also can guarantee to have enough intensity to bear on the basis from the load of fuel assembly inside, in-pile component and associated component, possess the lower drooping characteristic of existing relatively bottom nozzle design, keep high as far as possible anti-foreign matter ability simultaneously.
Realize the technical scheme of the utility model purpose: a kind of low pressure drop is prevented foreign matter fuel assembly bottom nozzle, and it comprises support frame, and the bottom nozzle lattice plate that is fixed on the support frame top; Described bottom nozzle lattice plate comprises two-ply, and wherein a laminate is big orifice plate, and another layer is for being arranged on the Turbogrid plates above or below the big orifice plate; Described Turbogrid plates are the cellular grid structure that vertical thin slice constitutes; Described big orifice plate is the slab construction that matches with grid plate dimensions, evenly distributed multiple lines and multiple rows size stream water hole on the big orifice plate; Each great circle discharge orifice is many parts by the grid division of Turbogrid plates on downward projection, and each position, great circle discharge orifice arranges the projected position of avoiding fuel rod.
Aforesaid a kind of low pressure drop is prevented foreign matter fuel assembly bottom nozzle, and its described Turbogrid plates are being furnished with web joint with each guide pipe and the corresponding link position of gauge pipe place; Four jiaos of places of every web joint offer a little discharge orifice; The center of every web joint also has the lock-screw hole, passes for lock-screw and realizes that bottom nozzle is with the connection of guide pipe and gauge pipe.
Aforesaid a kind of low pressure drop is prevented foreign matter fuel assembly bottom nozzle, and its described big orifice plate each position, rill water hole on downward projection has the identical roundlet discharge orifice of diameter.
Aforesaid a kind of low pressure drop is prevented foreign matter fuel assembly bottom nozzle, and its described Turbogrid plates are in the same place by welding or riveted and fixed with big orifice plate.
Aforesaid a kind of low pressure drop is prevented foreign matter fuel assembly bottom nozzle, and its described macropore plate thickness is at 12mm～20mm, and each the great circle discharge orifice diameter on the big orifice plate is at 7mm～11mm.
Aforesaid a kind of low pressure drop is prevented foreign matter fuel assembly bottom nozzle, and fillet or chamfered are carried out in the circular hole one or both ends of its described great circle discharge orifice.
As the anti-foreign matter fuel assembly bottom nozzle of above-mentioned a kind of low pressure drop, its described Turbogrid plates thickness is at 2mm ~ 5mm.
Aforesaid a kind of low pressure drop is prevented foreign matter fuel assembly bottom nozzle, and its described Turbogrid plates are made by the thin slice punching; Perhaps described Turbogrid plates are fixed and are placed in the peripheral frame by vertical lamellae cross welding and constitute.
Aforesaid a kind of low pressure drop is prevented foreign matter fuel assembly bottom nozzle, it is characterized in that: each the rill water hole diameter on the described web joint is at 5mm～8mm.
Effect of the present utility model is: fuel assembly bottom nozzle described in the utility model has uniform assignment of traffic function by the cooperation of big orifice plate and Turbogrid plates, realizes the balance of bottom nozzle intensity, pressure drop and anti-foreign matter function simultaneously.Thicker big orifice plate guarantees that this bottom nozzle has enough intensity and bears load suffered when moving in operation, transportation and the heap, the logical area of macropore plate current increases the pressure drop that has reduced base integral body simultaneously, can use simpler straight hole or single chamfering straight hole, reduce the difficulty of making.The Turbogrid plates structure has guaranteed after the aperture increases sufficient foreign matter filtration capacity is arranged still.
Description of drawings
Fig. 1 is existing bottom nozzle structural representation;
Fig. 2 is the anti-foreign matter bottom nozzle structural representation of low pressure drop described in the utility model;
Fig. 3 is the vertical view of Fig. 2;
Fig. 4 is the Turbogrid plates structural representation;
Fig. 5 is big AND DEWATERING FOR ORIFICE STRUCTURE synoptic diagram;
Fig. 6 is the discharge orifice location drawing;
Among the figure: 1---grid; 2---peripheral frame; 3---web joint; 4---little discharge orifice; 5---the lock-screw hole; 6---the great circle discharge orifice; 7---fuel rod; 8---bottom nozzle lattice plate; 9---support frame; 10---the roundlet discharge orifice.
Embodiment
Below in conjunction with the drawings and specific embodiments the anti-foreign matter fuel assembly bottom nozzle of a kind of low pressure drop described in the utility model is further described.
A kind of fuel assembly bottom nozzle described in the utility model comprises support frame 9, and the bottom nozzle lattice plate 8 that is weldingly fixed on support frame 9 tops.
This bottom nozzle lattice plate 8 comprises two-ply, and wherein a laminate is big orifice plate, and another layer is for being arranged on the Turbogrid plates above or below the big orifice plate.Turbogrid plates are in the same place by welding or riveted and fixed with big orifice plate.
As shown in Figure 4, Turbogrid plates are the cellular grid structure that vertical thin slice constitutes.Turbogrid plates can be furnished with web joint 3 with each guide pipe and the corresponding link position of gauge pipe place.Four jiaos of places of every web joint 3 offer a rill water hole 4.The center of every web joint 3 also has lock-screw hole 5, passes for lock-screw and realizes that bottom nozzle is with the connection of guide pipe and gauge pipe.Turbogrid plates thickness is at 2mm～5mm(for example: 2mm, 3mm or 5mm).Turbogrid plates can be made by the thin slice punching; Perhaps also can fix and be placed in the peripheral frame 2 by vertical lamellae cross welding and constitute.Rill water hole 4 diameters are at 5mm～8mm(for example: 5mm, 6mm or 8mm).
As shown in Figure 5, big orifice plate is the slab construction that matches with grid plate dimensions, evenly distributed multiple lines and multiple rows size stream water hole 4 on the big orifice plate; Each great circle discharge orifice 6 is divided into many parts by the grid 1 of Turbogrid plates on downward projection, and each 6 position, great circle discharge orifice arranges the projected position of avoiding fuel rod 7.
The slab construction of big orifice plate for matching with grid plate dimensions, except with each guide pipe and gauge pipe corresponding position, be evenly equipped with compact arranged great circle discharge orifice 6, each great circle discharge orifice 6 is divided into four parts by the grid 1 of Turbogrid plates on downward projection.The macropore plate thickness is at 12mm～20mm(for example: 12mm, 15mm or 20mm), each great circle discharge orifice 6 diameter on the big orifice plate at 7mm～11mm(for example: 7mm, 9mm or 11mm).
Big orifice plate mainly is responsible for bearing the load that the guide pipe transmission comes in the fuel assembly skeleton in the utility model.Great circle discharge orifice 6 the circulation area that can promote whole lattice plate is set, thereby reduce pressure drop; Fillet or chamfered are carried out in the circular hole one or both ends of great circle discharge orifice 6, with further reduction pressure drop.
As shown in Figure 3, after big orifice plate and the Turbogrid plates installation, each great circle discharge orifice 6 is divided into four parts by Turbogrid plates on downward projection, thereby reduced the size of single circulating area, having limited can be by the size of foreign matter, compensate the aperture and increased the filtration capacity decline that causes, promoted the anti-foreign matter ability of bottom nozzle integral body.
For typical 17 * 17 PWR fuel assemblies, as shown in Figures 2 and 3, Turbogrid plates are arranged on big orifice plate top.Be furnished with 25 web joints 3 with each guide pipe and the corresponding link position of gauge pipe place on the Turbogrid plates.On the big orifice plate except guide pipe and gauge pipe corresponding position, uniform arrangement 16 * 16 great circle discharge orifices 6.As shown in Figure 6, the projected position of 264 fuel rods 7 has been avoided in all 6 positions, great circle discharge orifice, in case fastening position screen work holding force is when not enough, fuel rod falls to blocking the discharge orifice or pass bottom nozzle and drops out reactor core.In the present embodiment, the aperture of great circle discharge orifice 6 is about 10mm, and during the macropore thickness of slab 18mm left and right sides, the peak stress of bottom nozzle is about 170MPa.The intensity fatigue behaviour meets the relevant regulations of ASME NG bundling.
Fuel assembly bottom nozzle described in the utility model because the flowing water aperture increases, designs lower more than 30% than the typical bottom nozzle design resistance coefficient of uniform roundlet discharge orifice at identical this bottom nozzle of situation of pass.The load-bearing capacity that cause after increasing in the aperture reduces and can compensate by the thickness of slab increase.
Claims (7)
1. a low pressure drop is prevented foreign matter fuel assembly bottom nozzle, and it comprises support frame (9), and the bottom nozzle lattice plate (8) that is fixed on support frame (9) top, it is characterized in that:
Described bottom nozzle lattice plate (8) comprises two-ply, and wherein a laminate is big orifice plate, and another layer is for being arranged on the Turbogrid plates above or below the big orifice plate;
Described Turbogrid plates are the cellular grid structure that vertical thin slice constitutes; Described big orifice plate is the slab construction that matches with grid plate dimensions, evenly distributed multiple lines and multiple rows size stream water hole (4) on the big orifice plate; Each great circle discharge orifice (6) is divided into many parts by the grid of Turbogrid plates (1) on downward projection, and each position, great circle discharge orifice (6) arranges the projected position of avoiding fuel rod (7).
2. a kind of low pressure drop according to claim 1 is prevented foreign matter fuel assembly bottom nozzle, and it is characterized in that: described Turbogrid plates are being furnished with web joint (3) with each guide pipe and the corresponding link position of gauge pipe place; Four jiaos of places of every web joint (3) offer a little discharge orifice (4); The center of every web joint (3) also has lock-screw hole (5), passes for lock-screw and realizes that bottom nozzle is with the connection of guide pipe and gauge pipe.
3. a kind of low pressure drop according to claim 2 is prevented foreign matter fuel assembly bottom nozzle, and it is characterized in that: described big orifice plate each position, little discharge orifice (4) on downward projection has the identical roundlet discharge orifice (4) of diameter.
4. a kind of low pressure drop according to claim 1 and 2 is prevented foreign matter fuel assembly bottom nozzle, it is characterized in that: described Turbogrid plates are in the same place by welding or riveted and fixed with big orifice plate.
3. a kind of low pressure drop according to claim 1 is prevented foreign matter fuel assembly bottom nozzle, it is characterized in that: described macropore plate thickness is at 12mm～20mm, and each great circle discharge orifice (6) diameter on the big orifice plate is at 7mm～11mm.
4. a kind of low pressure drop according to claim 3 is prevented foreign matter fuel assembly bottom nozzle, and it is characterized in that: fillet or chamfered are carried out in the circular hole one or both ends of described great circle discharge orifice (6).
5. a kind of low pressure drop according to claim 1 is prevented foreign matter fuel assembly bottom nozzle, and it is characterized in that: described Turbogrid plates thickness is at 2mm～5mm.
6. a kind of low pressure drop according to claim 5 is prevented foreign matter fuel assembly bottom nozzle, and it is characterized in that: described Turbogrid plates are made by the thin slice punching; Perhaps described Turbogrid plates are fixed and are placed in the peripheral frame (2) by vertical lamellae cross welding and constitute.
7. a kind of low pressure drop according to claim 2 is prevented foreign matter fuel assembly bottom nozzle, and it is characterized in that: the little discharge orifice of each on the described web joint (4) diameter is at 5mm～8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200168643U CN203070777U (en) | 2013-01-14 | 2013-01-14 | Low-pressure-drop anti-foreign matter fuel component lower pipe base |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200168643U CN203070777U (en) | 2013-01-14 | 2013-01-14 | Low-pressure-drop anti-foreign matter fuel component lower pipe base |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203070777U true CN203070777U (en) | 2013-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200168643U Expired - Lifetime CN203070777U (en) | 2013-01-14 | 2013-01-14 | Low-pressure-drop anti-foreign matter fuel component lower pipe base |
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| CN (1) | CN203070777U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247351A (en) * | 2013-01-14 | 2013-08-14 | 上海核工程研究设计院 | Low-pressure-drop foreign matter prevention type lower pipe seat of fuel assembly |
| CN104036829A (en) * | 2014-06-09 | 2014-09-10 | 中科华核电技术研究院有限公司 | Composite down pipe seat and nuclear reactor fuel assembly |
| CN109935352A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | Fuel assembly and its bottom device and anti-foreign matter component applied to bottom device |
-
2013
- 2013-01-14 CN CN2013200168643U patent/CN203070777U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247351A (en) * | 2013-01-14 | 2013-08-14 | 上海核工程研究设计院 | Low-pressure-drop foreign matter prevention type lower pipe seat of fuel assembly |
| CN103247351B (en) * | 2013-01-14 | 2015-11-25 | 上海核工程研究设计院 | A kind of low pressure drop anti-foreign matter fuel assembly bottom nozzle |
| CN104036829A (en) * | 2014-06-09 | 2014-09-10 | 中科华核电技术研究院有限公司 | Composite down pipe seat and nuclear reactor fuel assembly |
| CN109935352A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | Fuel assembly and its bottom device and anti-foreign matter component applied to bottom device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130717 |
|
| CX01 | Expiry of patent term |