CN204407015U - A kind of fuel assembly bottom nozzle of dual anti-foreign matter - Google Patents
A kind of fuel assembly bottom nozzle of dual anti-foreign matter Download PDFInfo
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- CN204407015U CN204407015U CN201420836447.8U CN201420836447U CN204407015U CN 204407015 U CN204407015 U CN 204407015U CN 201420836447 U CN201420836447 U CN 201420836447U CN 204407015 U CN204407015 U CN 204407015U
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- foreign matter
- discharge orifice
- filtration
- fuel assembly
- bottom nozzle
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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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- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The utility model discloses a kind of fuel assembly bottom nozzle of dual anti-foreign matter, relate to pressurized-water reactor design field, under bottom nozzle, lattice plate adopts large discharge orifice to design, and reduces pressure drop.For improving anti-foreign matter performance, first bottom nozzle adopts dummy slider to be split large discharge orifice, plays the first heavily anti-foreign matter function; Then adopt the anti-foreign matter device of a kind of tubular type to be arranged on above base, play the second heavily anti-foreign matter effect.Arranged by dual anti-foreign matter, large discharge orifice, by twice segmentation, is divided into some parts, greatly limit the foreign matter size that can pass through, and improves anti-foreign matter ability.Therefore, the design of large discharge orifice and dual anti-foreign matter design, the fuel assembly bottom nozzle of dual anti-foreign matter described in the utility model achieves reduction pressure drop, improves the performance of anti-foreign matter.
Description
Technical field
The utility model relates to pressurized-water reactor design field, particularly relates to a kind of fuel assembly bottom nozzle of dual anti-foreign matter.
Background technology
Pressurized-water reactor fuel assembly is made up of some fuel rods, guide pipe parts, gauge pipe parts, screen work, upper bottom nozzle etc. usually.Wherein, bottom nozzle, as the important component part of fuel assembly skeleton, is one of main load bearing component of fuel assembly, and its reliability directly affects the security of fuel assembly under operation, transport and running status.Simultaneously bottom nozzle is also important interface unit, its structural design to the operating performance of fuel assembly and and in-pile component compatibility have a direct impact.As the entrance of Core cooling agent, the anti-foreign matter performance of bottom nozzle is also one of important indicator of its combination property.Foreign matter in liquid coolant will cause great bodily injury due to collision friction etc. to fuel rod clad pipe as metal fragment enters in fuel assembly.In order to prevent foreign matter from entering in fuel assembly, bottom nozzle should play an important role as coolant entrance.
By finding the analysis of existing fuel assembly bottom nozzle, each main fuel company of the world is the main performance considered in its high strength, low pressure drop, anti-foreign matter etc. in bottom nozzle design.The bottom nozzle design of current main flow can be divided into two classes.Primary load bearing structure and anti-foreign matter structure for representative with the DFBN bottom nozzle of Westinghouse Electric, unite two into one, use lattice plate under little discharge orifice by the first kind.Under little discharge orifice, the circulation of lattice plate is than low, maintain very strong anti-foreign matter ability and the intensity allowance of abundance, simultaneously by the Venturi tube patent (Authorization Notice No. CN100592434C) of Westinghouse Electric's core patented technology, under lower circulation ratio, significantly reduce the pressure drop of lattice slab integral.Because discharge orifice diameter is little, therefore anti-foreign matter ability is stronger.Equations of The Second Kind is the mainstay thinking of other fuel corporation use at present, namely realizes main structural bearing function by the support frame structure of high as far as possible circulation ratio, keeps lower pressure drop simultaneously.But because the support frame of height circulation ratio often has larger-diameter discharge orifice, therefore need to guarantee higher anti-foreign matter ability by the filter screen of all kinds of characteristic or filter-plate structure.For Equations of The Second Kind bottom nozzle, find by carrying out analysis to existing filtration, existing filtration is generally divided into board-like, inserted type.Board-like anti-foreign matter device is generally filter, screen pack etc., by little discharge orifice sheet metal being offered various shape, is then arranged on above or below bottom nozzle lattice plate, plays the effect of anti-foreign matter.The anti-foreign matter device of inserted type is generally laths of metal, embeds in bottom nozzle discharge orifice, plays the effect that segmentation discharge orifice prevents foreign matter from passing through.
Foreign matter in liquid coolant will cause great bodily injury due to collision friction etc. to fuel rod clad pipe as metal fragment enters in fuel assembly.In order to prevent foreign matter from entering in fuel assembly, those skilled in the art is devoted to the fuel assembly bottom nozzle developing a kind of dual anti-foreign matter, has significant anti-foreign matter performance.
Utility model content
Because the above-mentioned defect of prior art; technical problem to be solved in the utility model prevents the foreign matter in runner from entering fuel assembly active region; the fuel rod clad pipe of protection fuel assembly active region, not by foreign object damage, therefore, devises dual anti-foreign matter device pointedly.Under described bottom nozzle, lattice plate adopts large discharge orifice to design, and reduces pressure drop.For improving anti-foreign matter performance, first bottom nozzle adopts dummy slider to be split large discharge orifice, plays the first heavily anti-foreign matter function; Then adopt the anti-foreign matter device of a kind of tubular type to be arranged on above base, play the second heavily anti-foreign matter effect.Arranged by dual anti-foreign matter, large discharge orifice, by twice segmentation, is divided into some parts, greatly limit the foreign matter size that can pass through, and improves anti-foreign matter ability.Therefore, the design of large discharge orifice and dual anti-foreign matter design, the fuel assembly bottom nozzle of dual anti-foreign matter described in the utility model achieves reduction pressure drop, improves the performance of anti-foreign matter
For achieving the above object, the utility model provides a kind of fuel assembly bottom nozzle of dual anti-foreign matter, comprise lower lattice plate, support frame and filtration, described lower lattice plate is positioned at the top of described support frame, run through the guiding pore be provided with for installing fuel assembly guide pipe, for install fuel assembly gauge pipe instrument pore and for cooling medium circulation and the discharge orifice group that reallocates to flow, it is characterized in that, described filtration includes the filtration dummy slider and strainer tube battle array that cooperatively interact, described filtration dummy slider and strainer tube battle array are configured to jointly divide the projecting plane of described discharge orifice group on cooling medium circulating direction.
Further, described discharge orifice group is made up of the discharge orifice that one group of shape of cross section is identical or different, and the shape of cross section of described discharge orifice comprises circular and non-circular; The shape that described discharge orifice selects characteristic dimension larger is to improve circulation; Described characteristic dimension refers to the diameter of circular hole or the external diameter of a circle of non-circular hole.
Further, described hole characteristic size is between 8mm ~ 11mm.
Further, described filtration dummy slider is ribbon structure, is provided with the groove for assembling, and described groove width is determined by described filtration insert thickness, the spacing of adjacent described groove is determined by discharge orifice spacing on described lower lattice plate, and gash depth is 1/3 ~ 2/3 of described filtration dummy slider height; Described lower lattice plate is arranged the groove for embedding described filtration dummy slider, described groove width is determined by described filtration insert thickness, and described gash depth is determined by described filtration dummy slider height, is 1/3 ~ 3/2 of described filtration dummy slider height; Described groove and described filtration dummy slider between any two cross are inlayed.
Further, described strainer tube battle array is the filtration of some tube-shaped element composition, and described tube-shaped element is circular or polygon, and diameter is 10mm ~ 13mm, and wall thickness is 0.4mm ~ 1mm, lines up array after connection; During arrangement, described tube-shaped element is coaxial with fuel rod.
In better embodiment of the present utility model, form primarily of the support frame of square lower lattice plate, lower lattice plate bottom and the filtration on lower lattice plate top.
Described lower lattice plate is square structure, it runs through and is provided with guiding pore for installing fuel assembly guide pipe, instrument pore for installing fuel assembly gauge pipe and hole, discharge orifice group for cooling medium circulation with reallocate to flow.Described discharge orifice hole group, can be chosen as circular hole or profile hole, and hole characteristic size (circular hole aperture, other equilateral profiled holes circumscribed circle diameter etc.) designs according to reactor core entrance coolant flow.For realizing the design of large discharge low pressure drop, the hole characteristic size that general design is larger.By circulation and the low base pressure drop of large hole characteristic Assurance of Size cooling medium.Described hole characteristic size can be selected between 8mm ~ 11mm.Upper grid plate is provided with groove, for installing filtration dummy slider.
Described filtration comprises the strainer tube battle array on filtration dummy slider in discharge orifice and lower lattice plate top.
Described filtration dummy slider is ribbon structure, and thickness is 0.4mm ~ 1mm, it is designed with the groove for assembling, and groove width determines by filtering insert thickness, is about 0.5mm ~ 1.1mm.The spacing of adjacent trenches is determined by discharge orifice spacing on lattice plate, is about 9mm ~ 13mm.Gash depth is about 1/3 ~ 2/3 of filtration dummy slider height.The design of groove ensures that filtering dummy slider can inlay by cross between any two.Lattice plate designs by the groove for embedding filtration dummy slider, groove width determines by filtering insert thickness, is about 0.5mm ~ 1.1mm simultaneously.Gash depth determines by filtering dummy slider height, is generally and filters 1/3 ~ 3/2 of dummy slider height.Filter in the crisscross embedding upper grid plate of dummy slider, and fixed by welding or soldering, realize the segmentation to discharge orifice, play the first heavily anti-foreign matter effect.
Described strainer tube battle array is the filtration that metal tube or becket form.Metal tube, can be circle, polygon or other profiled holes, diameter be generally 10 ~ 13mm, and wall thickness is 0.4 ~ 1mm, lines up array by welding or soldering.During arrangement, metal tube is coaxial with fuel rod.Then to burn-on in pipe battle array periphery metal band, play reinforcement effect.Strainer tube battle array seat, on lattice plate, is fixed by welding or soldering.Strainer tube battle array, by being filtered the discharge orifice Further Division of bar segmentation, limiting the foreign matter size that can pass through further, greatly improves anti-foreign matter ability.
The feature of above-mentioned lower lattice plate, filtration dummy slider, strainer tube battle array etc. can realize the object of bottom nozzle low pressure drop, high anti-foreign matter performance.
In sum, the beneficial effect of the fuel assembly bottom nozzle of a kind of dual anti-foreign matter described in the utility model is as follows:
(1) the utility model is by the large discharge orifice design on lattice plate under bottom nozzle, and bottom nozzle pressure drop can be made to reduce, and ensure the coolant pressure of fuel assembly entrance, the design for filtration provides larger pressure drop allowance.
(2) the utility model filters dummy slider design by bottom nozzle, splits large discharge orifice, and restriction foreign matter, by size, improves the anti-foreign matter ability of base.Reduce foreign matter and enter fuel assembly active region, destroy the risk of fuel assembly cladding tubes, thus improve fuel assembly performance.
(3) the utility model is by the design of bottom nozzle strainer tube battle array, splits large discharge orifice, and restriction foreign matter, by size, improves the anti-foreign matter ability of base.Reduce foreign matter and enter fuel assembly active region, destroy the risk of fuel assembly cladding tubes, thus improve fuel assembly performance.
(4) bottom nozzle for nuclear fuel assembly that relates to of the utility model, by the pass pore diameter characteristics in lower lattice plate current water hole, meets the functional requirement of low pressure drop; Dual anti-foreign matter simultaneously by filtering dummy slider and strainer tube battle array is arranged, and improves the anti-foreign matter ability of fuel assembly.Ensure that fuel assembly inlet pressure simultaneously, prevents foreign matter from entering fuel assembly, protection fuel rod clad pipe, improves fuel assembly performance.
Be described further below with reference to the technique effect of accompanying drawing to design of the present utility model, concrete structure and generation, to understand the purpose of this utility model, characteristic sum effect fully.
Accompanying drawing explanation
Fig. 1 is the dual anti-foreign matter bottom nozzle vertical view of a preferred embodiment of the present utility model;
Fig. 2 is the dual anti-foreign matter bottom nozzle stereographic map of a preferred embodiment of the present utility model;
Fig. 3 is lattice plate vertical view under the large discharge orifice of a preferred embodiment of the present utility model;
Fig. 4 is the lower lattice plate groove schematic diagram of a preferred embodiment of the present utility model;
Fig. 5 is the multi-form filtration dummy slider of a preferred embodiment of the present utility model;
Fig. 6 is the lower lattice plate of the assembling filter dummy slider of a preferred embodiment of the present utility model;
Fig. 7 is the strainer tube battle array schematic diagram of a preferred embodiment of the present utility model;
Fig. 8 is the dual anti-foreign matter structural profile schematic diagram of a preferred embodiment of the present utility model;
Fig. 9 is the strainer tube battle array schematic diagram of another preferred embodiment of the present utility model;
Figure 10 is the assembling filter dummy slider of another preferred embodiment of the present utility model and the lower lattice plate of strainer tube battle array;
Name in accompanying drawing corresponding to Reference numeral is called: 1-bottom nozzle; 2-support frame; Lattice plate under 3-; 4-strainer tube battle array; 5-discharge orifice; 6-groove; 7-filters dummy slider; 8-nuclear fuel rod.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited only to this.As shown in Fig. 1 (vertical view, without nuclear fuel rod 8) and Fig. 8 (sectional view), the bottom nozzle 1 in the utility model in some embodiments, is made up of support frame 2, lower lattice plate 3, filtration dummy slider 7, strainer tube battle array 4 etc.
Embodiment 1:
As shown in Figure 2, the bottom nozzle 1 of some embodiments in the utility model, is made up of filtration base 4, filtration dummy slider 7, lower lattice plate 3 and support frame 2.Wherein undermost is support frame 2, and be made up of four pins and periphery, pin coordinates with the fixed pin of reactor core lower plate, plays fixed support effect.
Lower lattice plate 3 is by being welded to connect on support frame 2.Lower lattice plate 3 is by panel machine processing and manufacturing, and for the length of side is about the square of 180mm ~ 220mm, thickness is about 15 ~ 25mm.As shown in Figure 3, lower lattice plate 3 has discharge orifice 5 by mach mode.Discharge orifice 5 can be circular, square or other shapes, and its equivalent diameter is about 5 ~ 7mm.Filtering dummy slider 7 for installing, lower lattice plate 3 having groove 6 by the mode of machine work or Linear cut, as shown in Figure 4.
Filtering dummy slider 7 is ribbon, is made by machine work or stamping forming mode.Filter the various informative of dummy slider 7, as shown in Figure 5.Filtering dummy slider 7 thickness is 0.4mm ~ 1mm, it is designed with the groove for assembling, and groove width determines by filtering dummy slider 7 thickness, is about 0.5mm ~ 1.1mm.The spacing of adjacent trenches is determined by the spacing of discharge orifice 5 on lower lattice plate 3, is about 9mm ~ 13mm.Gash depth is about 1/3 ~ 2/3 of filtration dummy slider 7 height.The design of groove ensures that filtering dummy slider 7 can inlay by cross between any two.After filtration dummy slider 7 is assembled into the structure of egg Lou shape, be arranged on lower lattice plate 3 by the groove 6 on lower lattice plate 3, and fixed by welding or soldering.Therefore discharge orifice 5 on lower lattice plate 3 is filtered dummy slider 7 and is divided into four parts, limits the size that foreign matter passes through.
Lower lattice plate 3 installs again strainer tube battle array 4 thereon after embedding and filtering dummy slider 7.Strainer tube battle array 4 is welded by tubing and frame coaming plate or brazing forms.Strainer tube battle array 4 is made up of frame coaming plate, metal tube etc., and the frame coaming plate of strainer tube battle array 4 coordinates with lower lattice plate size, and for the length of side is about the square of 180mm ~ 220mm, frame coaming plate height be about 5 ~ 10mm consistent with metal tube, thickness is about 0.5 ~ 1mm.The metal tube of strainer tube battle array 4 is generally circle (as Fig. 7), rectangle (as Fig. 9) or other profiled holes shapes, and equivalent diameter is 10 ~ 13mm, Guan Gaowei 5 ~ 10mm, and wall thickness is 0.4 ~ 1mm.Metal tube is in turn connected into Guan Zhen by soldering or welding, manages coaxial with fuel rod.Then reinforcement effect is played in frame periphery of burn-oning.The strainer tube battle array assembled 4 is on lower lattice plate 3, and assessment welding or soldering are fixed.
As shown in Figure 8, at the positive corresponding nuclear fuel rod 8 of each strainer tube unit of strainer tube battle array 4, and nuclear fuel rod 8 stretches in strainer tube battle array 4.Be mounted to criss-cross filtration dummy slider 7, together with strainer tube battle array 4, the cooling water flow in large discharge hole be divided into 8 parts.Said structure can be found out, be ensure that the low pressure drop performance of bottom nozzle by the discharge orifice, large aperture 5 on lower lattice plate 3.By filtering the cooperation of dummy slider 7 and strainer tube battle array 4, discharge orifice 5 is divided into some parts, and the foreign matter limited in cooling medium enters fuel assembly, realizes the performance of strong anti-foreign matter.
As mentioned above, just can realize the utility model preferably, but above-described embodiment is only and realizes representative configurations of the present utility model.For strengthening effect of the present utility model, can change in above-described embodiment the form of filtering dummy slider 7 according to actual conditions in implementation process, also can change the shape of metal tube in strainer tube battle array 4.Its principle is and uses dual anti-foreign matter device, is several by the less region of area by discharge orifice Further Division, thus limits foreign matter and pass through, and realizes high anti-foreign matter performance.
More than describe preferred embodiment of the present utility model in detail.Should be appreciated that the ordinary skill of this area just can make many modifications and variations according to design of the present utility model without the need to creative work.Therefore, all technician in the art according to design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should by the determined protection domain of claims.
Claims (5)
1. the fuel assembly bottom nozzle of a dual anti-foreign matter, comprise lower lattice plate, support frame and filtration, described lower lattice plate is positioned at the top of described support frame, run through the guiding pore be provided with for installing fuel assembly guide pipe, for install fuel assembly gauge pipe instrument pore and for cooling medium circulation and the discharge orifice group that reallocates to flow, it is characterized in that, described filtration includes the filtration dummy slider and strainer tube battle array that cooperatively interact, described filtration dummy slider and strainer tube battle array are configured to jointly divide the projecting plane of described discharge orifice group on cooling medium circulating direction.
2. the fuel assembly bottom nozzle of a kind of dual anti-foreign matter as claimed in claim 1, described discharge orifice group is made up of the discharge orifice that one group of shape of cross section is identical or different, and the shape of cross section of described discharge orifice comprises circular and non-circular; It is characterized in that, the shape that described discharge orifice selects characteristic dimension larger is to improve circulation; Described characteristic dimension refers to the diameter of circular hole or the external diameter of a circle of non-circular hole.
3. the fuel assembly bottom nozzle of a kind of dual anti-foreign matter as claimed in claim 2, it is characterized in that, described hole characteristic size is between 8mm ~ 11mm.
4. the fuel assembly bottom nozzle of a kind of dual anti-foreign matter as described in claim 1 or 2 or 3, it is characterized in that, described filtration dummy slider is ribbon structure, be provided with the groove for assembling, described groove width is determined by described filtration insert thickness, the spacing of adjacent described groove is determined by discharge orifice spacing on described lower lattice plate, and gash depth is 1/3 ~ 2/3 of described filtration dummy slider height; Described lower lattice plate is arranged the groove for embedding described filtration dummy slider, described groove width is determined by described filtration insert thickness, and described gash depth is determined by described filtration dummy slider height, is 1/3 ~ 3/2 of described filtration dummy slider height; Described groove and described filtration dummy slider between any two cross are inlayed.
5. the fuel assembly bottom nozzle of a kind of dual anti-foreign matter as claimed in claim 4, it is characterized in that, described strainer tube battle array is the filtration of some tube-shaped element composition, described tube-shaped element is circular or polygon, diameter is 10mm ~ 13mm, wall thickness is 0.4mm ~ 1mm, lines up array after connection; During arrangement, described tube-shaped element is coaxial with fuel rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420836447.8U CN204407015U (en) | 2014-12-19 | 2014-12-19 | A kind of fuel assembly bottom nozzle of dual anti-foreign matter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420836447.8U CN204407015U (en) | 2014-12-19 | 2014-12-19 | A kind of fuel assembly bottom nozzle of dual anti-foreign matter |
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| CN204407015U true CN204407015U (en) | 2015-06-17 |
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| CN201420836447.8U Active CN204407015U (en) | 2014-12-19 | 2014-12-19 | A kind of fuel assembly bottom nozzle of dual anti-foreign matter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104575628A (en) * | 2014-12-19 | 2015-04-29 | 上海核工程研究设计院 | Fuel assembly lower tube seat with double foreign matter prevention functions |
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2014
- 2014-12-19 CN CN201420836447.8U patent/CN204407015U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104575628A (en) * | 2014-12-19 | 2015-04-29 | 上海核工程研究设计院 | Fuel assembly lower tube seat with double foreign matter prevention functions |
| CN104575628B (en) * | 2014-12-19 | 2017-11-07 | 上海核工程研究设计院 | A kind of fuel assembly bottom nozzle of dual anti-foreign matter |
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| GR01 | Patent grant | ||
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Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE |