CN106997785A - Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly - Google Patents
Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly Download PDFInfo
- Publication number
- CN106997785A CN106997785A CN201710236915.6A CN201710236915A CN106997785A CN 106997785 A CN106997785 A CN 106997785A CN 201710236915 A CN201710236915 A CN 201710236915A CN 106997785 A CN106997785 A CN 106997785A
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- CN
- China
- Prior art keywords
- bottom nozzle
- connecting plate
- pressure drop
- fuel assembly
- shirt rim
- 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.)
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Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/322—Means to influence the coolant flow through or around the bundles
-
- 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a kind of low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly, closing skirt edge type bottom nozzle includes connecting plate, several supporting legs and shirt rim；Several supporting leg intervals are connected to below the connecting plate, and the shirt rim is connected to below the connecting plate between the adjacent supporting leg, is enclosed together with the supporting leg below the connecting plate periphery.In the present invention, closed-loop layout of the shirt rim below connecting plate while bottom nozzle pressure drop coefficient is reduced, with higher intensity, improves the dimensional stability of bottom nozzle.There is provided bottom nozzle exit flow field evenly in fuel assembly so that the flow field in bottom nozzle above fuel bundle area is more uniform, advantageously reduces the Flow vibration level of fuel rod lower end, reduces bottom nozzle pressure drop coefficient.
Description
Technical field
The present invention relates to nuclear reactor technology field, more particularly to a kind of low pressure drop bottom nozzle, the combustion using the bottom nozzle
Expect component lower component and fuel assembly.
Background technology
Commercialization presurized water reactor in-pile component is designed with Westinghouse Electric, Siemens Company, combustion enginnering company, Ba Wei companies at present
Four types, each type of fuel assembly lower support component (lower core plate) differs.To coordinate these four types
In-pile component, fuel assembly bottom nozzle also has four types.
The bottom nozzle of existing western room type PWR fuel assembly is that connecting plate (is also known as matching disc, supporting plate, adapter
Plate) the stool-type structure of four supporting legs of band, carries part shirt rim to improve intensity between two supporting legs.Under shirt rim
The passage for fluid communication between consecutive fuel component bottom nozzle is left between two supporting legs in portion.Existing this kind of down tube
Seat enters after bottom nozzle chamber because of fluid (cooling agent) from lower core plate spray-hole, sudden expansion sudden contraction process can be undergone, with 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 reduction bottom nozzle pressure drop coefficient, to improve intensity
Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly using the bottom nozzle.
The technical solution adopted for the present invention to solve the technical problems is：A kind of low pressure drop bottom nozzle, including connection are provided
Plate, several supporting legs and shirt rim；Several supporting leg intervals are connected to below the connecting plate, and the shirt rim is connected to institute
State between connecting plate lower section and the adjacent supporting leg, enclosed together with the supporting leg below the connecting plate periphery.
Preferably, the inner side of the shirt rim is provided with chamfered section so that the thickness of the shirt rim connects the connecting plate certainly
One end gradually increases to one end away from the connecting plate.
Preferably, the surface of the chamfered section is cambered surface, plane or streamlined face.
Preferably, it is provided with chamfering on the outside of the one end of the supporting leg and/or the shirt rim away from the connecting plate.
Preferably, bottom of the shirt rim away from the connecting plate is provided with groove portion.
Preferably, the depth of the groove portion is less than 1mm.
Preferably, the connecting plate is provided with the through hole of several insertion connecting plate upper and lower surfaces.
The present invention also provides a kind of fuel assembly lower component, including lower core plate and the down tube described in any of the above
Seat；The lower core plate is provided with the spray-hole of several insertions, and the bottom nozzle is arranged in the lower core plate, and is covered
On the spray-hole.
Preferably, the surface of the chamfered section of the bottom nozzle shirt rim smoothly connects with the medial surface of the spray-hole.
The present invention also provides a kind of fuel assembly, including described in any one of the bottom nozzle described in any of the above or more
Fuel assembly lower component.
Beneficial effects of the present invention：Closed-loop layout of the shirt rim below connecting plate, in reduction bottom nozzle pressure loss system
While number, with higher intensity, the dimensional stability of bottom nozzle is improved.There is provided down tube evenly in fuel assembly
Seat exit flow field so that the flow field in bottom nozzle above fuel bundle area is more uniform, the stream for advantageously reducing fuel rod lower end is caused
Level of vibration, reduces bottom nozzle pressure drop coefficient.
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 low pressure drop bottom nozzle of first embodiment of the invention；
Fig. 2 is the polycrystalline substance schematic diagram of bottom nozzle shown in Fig. 1；
Fig. 3 is the cut-away section structural representation of the low pressure drop bottom nozzle of second embodiment of the invention；
Fig. 4 is the polycrystalline substance schematic diagram of the low pressure drop bottom nozzle of third embodiment of the invention；
Fig. 5 is the cut-away section structural representation of the low pressure drop bottom nozzle of third embodiment of the invention；
Fig. 6 is the structural representation of the fuel assembly lower component of the present invention；
Fig. 7 is the structural representation of the fuel assembly lower component of one embodiment of the invention；
Fig. 8 is the structural representation of the fuel assembly lower component of another embodiment of the present invention；
Fig. 9 is the structural representation of the fuel assembly lower component of further embodiment of this invention；
Figure 10 is the geometrical model figure of the CFD analyses of bottom nozzle of the present invention and prior art bottom nozzle；
Figure 11 is Figure 10 corresponding whirlpool energy loss schematic diagram of bottom nozzle；
Figure 12 is Figure 10 corresponding Flow Field Distribution schematic diagram of bottom nozzle；
Figure 13 is Figure 10 corresponding pressure drop schematic diagram of bottom nozzle.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now compare accompanying drawing and describe in detail
The embodiment of the present invention.
As shown in Figure 1, 2, the low pressure drop bottom nozzle of first embodiment of the invention, for fuel assembly, the bottom nozzle can be wrapped
Include connecting plate 10, several supporting legs 11 and shirt rim 12.Several intervals of supporting leg 11 are connected to the lower section of connecting plate 10, and shirt rim 12 connects
It is connected between the lower section of connecting plate 10 and adjacent supporting leg 11, is enclosed together with supporting leg 11 below the periphery of connecting plate 10, can
Form the side plate 20 of the lower section of connecting plate 10.Side plate 20 is formed such that between supporting leg 11 without passage, prevents cooling agent adjacent
Circulated between fuel assembly bottom nozzle, reduce pressure drop.
Wherein, connecting plate 10 is provided with the through hole 30 of several upper and lower surfaces of insertion connecting plate 10.In fuel assembly, through hole
30 parts are positioned for the grafting of guide pipe, and a part is used for the longitudinal direction circulation for fluid such as cooling agent.
Generally, connecting plate 10 is in quadrangle, and supporting leg 11 corresponds in four diagonal angles respectively provided with four, its holding mainly
Load is acted on, it is ensured that load.
A shirt rim 12 is connected between the adjacent supporting leg 11 of each two, so as to have skirt below 10 4 sides of connecting plate
Close on side 12.Several shirt rims 12 cross an inner space below connecting plate 10, are available for cooling agent to pass through.
Supporting leg 11 is more than the width of shirt rim 12 on width, plays a supporting role.
In the present embodiment, shirt rim 12 is in tabular, and width in the height direction everywhere is consistent.
As shown in figure 3, the low pressure drop bottom nozzle of second embodiment of the invention, and unlike above-mentioned first embodiment：Skirt
The inner side on side 12 is provided with chamfered section 13 so that the thickness of shirt rim 12 is from the one end being connected with connecting plate 10 to remote connecting plate 10
One end gradually increases.
The setting of chamfered section 13, for being engaged with lower core plate spray-hole, further reduces pressure drop.
The surface of chamfered section 13 can be plane, can further be optimized for cambered surface, streamlined face or other curved surfaces etc..
As shown in Figure 4,5, the low pressure drop bottom nozzle of third embodiment of the invention, it is different from above-mentioned first, second embodiment
Be：Bottom of the shirt rim 12 away from connecting plate 10 is provided with groove portion 14.
Groove portion 14 is the shallow slot that depth is less than 1mm so that the relative protrusion shirt rim 12 in the bottom of supporting leg 11, it is ensured that load is passed
Path is passed constant (bottom nozzle loading end is still in the part of supporting leg 11), while also avoiding cooling agent in consecutive fuel component bottom nozzle
Between circulate.
Further, in the present embodiment, shirt rim 12 is additionally provided with chamfering 15 on the outside of one end away from connecting plate 10.
As needed, chamfering 15 can also be provided on the outside of the one end of supporting leg 11 away from connecting plate 10, or extend to branch
On the outside of the one end of support leg 11 away from connecting plate 10, so as to be formed with chamfering 15 on the outside of one end of whole side plate 20.
As needed, in the bottom nozzle of first embodiment or second embodiment, on the outside of one end of shirt rim 12 and/supporting leg 11
Also chamfering can be provided with.
The low pressure drop bottom nozzle of the present invention, is arranged in lower core plate in fuel assembly.Supporting leg 11 is away from connecting plate
10 bottom can be provided with alignment pin or positioning hole for installing.
As shown in Figure 6,7, fuel assembly lower component of the invention, including lower core plate 40 and bottom nozzle；The down tube
Seat is the above-mentioned first embodiment low pressure drop bottom nozzle any into 3rd embodiment.Lower core plate 40 is provided with several insertions
Spray-hole 41, bottom nozzle is arranged in lower core plate 40, and is covered on spray-hole 41, so that spray-hole 41 is distributed in down
In the coverage of base.
Preferably, in bottom nozzle, the inner side of shirt rim 12 is provided with chamfered section 13；The surface of chamfered section 13 is interior with spray-hole 41
Side smoothly connects.
In one embodiment as shown in Figure 7, the surface of chamfered section 13 is plane.
In one embodiment as shown in Figure 8, the surface of chamfered section 13 is cambered surface.
In one embodiment as shown in Figure 9, the surface of chamfered section 13 is streamlined face.
In Fig. 7-embodiment illustrated in fig. 9, chamfered section 13 can smoothly connect with the medial surface of spray-hole 41.
The fuel assembly of the present invention, including above-mentioned first embodiment any bottom nozzle or above-mentioned into 3rd embodiment
Fuel assembly lower component.Fuel assembly also includes several fuel rods, grid spacer, guide pipe, upper base etc., can be using existing
There is technology realization.
By the bottom nozzle of second embodiment shown in first embodiment shown in Fig. 1 in the present invention and Fig. 3 and of the prior art
Bottom nozzle (leaving passage between two supporting legs) is compared, as follows：
As shown in Figure 10, the bottom nozzle of prior art, first embodiment of the invention and second is from left to right followed successively by implement
The geometrical model of the CFD analyses of the bottom nozzle of example.
Figure 11 is the corresponding whirlpool energy loss schematic diagram of tri- bottom nozzles of Figure 10, is from left to right followed successively by prior art
The bottom nozzle of bottom nozzle, first embodiment of the invention and second embodiment；It can be seen that the bottom nozzle of the present invention is compared to existing
Some bottom nozzles, reduce fluid sudden expansion, so as to reduce whirlpool energy loss.
Figure 12 be the corresponding Flow Field Distribution schematic diagram of three bottom nozzles, be from left to right followed successively by prior art bottom nozzle,
The bottom nozzle of first embodiment of the invention and second embodiment；It can be seen that the bottom nozzle of the present invention is compared with existing down tube
Seat is reduced because of whirlpool, and flow field is more uniformly distributed.
As shown in figure 13, calculated and shown according to CFD, the pressure drop using bottom nozzle in the prior art (A in such as figure) is 0 as pair
Than using the bottom nozzle (B in such as figure) of first embodiment shown in Fig. 1, pressure drop can reduce at least 1%, real using shown in Fig. 2 second
The bottom nozzle (C in such as figure) of example is applied, pressure drop can reduce at least 8%, and bottom nozzle is exported, the flow field in fuel bundle area is more equal
It is even.
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
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 low pressure drop bottom nozzle, it is characterised in that including connecting plate, several supporting legs and shirt rim；Several supports
Leg interval is connected to below the connecting plate, the shirt rim be connected to below the connecting plate and the adjacent supporting leg it
Between, enclosed together with the supporting leg below the connecting plate periphery.
2. low pressure drop bottom nozzle according to claim 1, it is characterised in that the inner side of the shirt rim is provided with chamfered section, makes
The thickness for obtaining the shirt rim gradually increases from the one end for connecting the connecting plate to one end away from the connecting plate.
3. low pressure drop bottom nozzle according to claim 2, it is characterised in that the surface of the chamfered section is cambered surface, plane
Or streamlined face.
4. low pressure drop bottom nozzle according to claim 1, it is characterised in that the supporting leg and/or the shirt rim are remote
Chamfering is provided with the outside of one end of the connecting plate.
5. low pressure drop bottom nozzle according to claim 1, it is characterised in that bottom of the shirt rim away from the connecting plate
Provided with groove portion.
6. low pressure drop bottom nozzle according to claim 5, it is characterised in that the depth of the groove portion is less than 1mm.
7. low pressure drop bottom nozzle according to claim 1, it is characterised in that the connecting plate is connected provided with several insertions
The through hole of plate upper and lower surface.
8. a kind of fuel assembly lower component, it is characterised in that including described in lower core plate and claim any one of 1-7
Bottom nozzle；The lower core plate is provided with the spray-hole of several insertions, and the bottom nozzle is arranged in the lower core plate, and
And be covered on the spray-hole.
9. fuel assembly lower component according to claim 8, it is characterised in that the chamfered section of the bottom nozzle shirt rim
Surface smoothly connects with the medial surface of the spray-hole.
10. a kind of fuel assembly, it is characterised in that including the bottom nozzle or claim 8-9 described in claim any one of 1-7
Fuel assembly lower component described in any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710236915.6A CN106997785B (en) | 2017-04-12 | 2017-04-12 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710236915.6A CN106997785B (en) | 2017-04-12 | 2017-04-12 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106997785A true CN106997785A (en) | 2017-08-01 |
| CN106997785B CN106997785B (en) | 2019-01-08 |
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ID=59433958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710236915.6A Active CN106997785B (en) | 2017-04-12 | 2017-04-12 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106997785B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108010590A (en) * | 2017-12-18 | 2018-05-08 | 岭澳核电有限公司 | Protrusion type bottom nozzle and fuel assembly |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05341073A (en) * | 1992-06-11 | 1993-12-24 | Nuclear Fuel Ind Ltd | Lower nozzle for pwr fuel assembly |
| JPH05341069A (en) * | 1992-06-11 | 1993-12-24 | Nuclear Fuel Ind Ltd | Lower nozzle for pwr fuel assembly |
| US20060227923A1 (en) * | 2005-04-08 | 2006-10-12 | Westinghouse Electric Company Llc | Nuclear fuel assembly low pressure drop top nozzle |
| CN102592687A (en) * | 2011-01-14 | 2012-07-18 | 中科华核电技术研究院有限公司 | Low-pressure-drop fuel assembly upper tube seat |
| 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 |
| CN203882625U (en) * | 2014-06-09 | 2014-10-15 | 中科华核电技术研究院有限公司 | Combined type down tube base and nuclear reactor fuel assembly |
| CN207124037U (en) * | 2017-04-12 | 2018-03-20 | 岭东核电有限公司 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
-
2017
- 2017-04-12 CN CN201710236915.6A patent/CN106997785B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05341073A (en) * | 1992-06-11 | 1993-12-24 | Nuclear Fuel Ind Ltd | Lower nozzle for pwr fuel assembly |
| JPH05341069A (en) * | 1992-06-11 | 1993-12-24 | Nuclear Fuel Ind Ltd | Lower nozzle for pwr fuel assembly |
| US20060227923A1 (en) * | 2005-04-08 | 2006-10-12 | Westinghouse Electric Company Llc | Nuclear fuel assembly low pressure drop top nozzle |
| CN102592687A (en) * | 2011-01-14 | 2012-07-18 | 中科华核电技术研究院有限公司 | Low-pressure-drop fuel assembly upper tube seat |
| 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 |
| CN203882625U (en) * | 2014-06-09 | 2014-10-15 | 中科华核电技术研究院有限公司 | Combined type down tube base and nuclear reactor fuel assembly |
| CN207124037U (en) * | 2017-04-12 | 2018-03-20 | 岭东核电有限公司 | Low pressure drop bottom nozzle, fuel assembly lower component and fuel assembly |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108010590A (en) * | 2017-12-18 | 2018-05-08 | 岭澳核电有限公司 | Protrusion type bottom nozzle and fuel assembly |
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| Publication number | Publication date |
|---|---|
| CN106997785B (en) | 2019-01-08 |
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