CN203013278U - Down tube seat of fuel assembly - Google Patents
Down tube seat of fuel assembly Download PDFInfo
- Publication number
- CN203013278U CN203013278U CN2012206279823U CN201220627982U CN203013278U CN 203013278 U CN203013278 U CN 203013278U CN 2012206279823 U CN2012206279823 U CN 2012206279823U CN 201220627982 U CN201220627982 U CN 201220627982U CN 203013278 U CN203013278 U CN 203013278U
- Authority
- CN
- China
- Prior art keywords
- fuel assembly
- down tube
- tube seat
- pore plate
- utility
- 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.)
- Expired - Fee Related
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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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- Fuel-Injection Apparatus (AREA)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Abstract
The utility model discloses a down tube seat of a fuel assembly. The down tube seat comprises a pore plate and is characterized in that the surface of the pore plate (1) is an arc surface; the pore plate (1) is provided with a plurality of circular drain holes (2); and the open pore shapes of the circular drain holes (2) are gradually reduced from top to bottom. Due to the arrangement of the arc pore plate of the down tube seat, the quantity of cooling water entering a reactor core is effectively increased, the hydraulic lifting power of a cooling agent is reduced, the cooling effect on the surface of the fuel assembly is enhanced, the heat engineering safety performance of the fuel assembly is greatly improved, and the safety allowance of the fuel assembly is greatly increased; and due to the design for the shapes of the drain holes, the cooling agent is prevented from shooting and scouring a fuel rod, and foreign matters are prevented from entering into the fuel assembly.
Description
Technical field
The utility model relates to nuclear engineering field, especially a kind of bottom nozzle of PWR fuel assembly.
Background technology
PWR fuel assembly is the core component in presurized water reactor, and its design relation is to security, reliability and the economy of presurized water reactor.Bottom nozzle is the lower junction member of PWR fuel assembly, it bears the horizontal and axial load of fuel assembly, and these load are passed to lower core plate, the bottom nozzle orifice plate has the discharge orifice, flow into the passage of fuel assembly and distribute the coolant flow that flows into fuel assembly as cooling medium, and playing and prevent that foreign matter from entering the effect of fuel assembly and then wearing and tearing fuel rod.
Because existing bottom nozzle orifice plate is all a flat board, its flowing water area and mechanical property do not reach optimized state, and hydraulic resistance is large, thereby and current may form to swash and penetrate washing away the fuel rod bottom.
The utility model content
For existing deficiency in prior art, for the Optimum Hydraulic performance, strengthen cooling medium to the cooling effect of fuel assembly in transport process, physical construction for bottom nozzle, the present invention proposes a kind of circular arc orifice plate design proposal of bottom nozzle, thereby realize to improve thermal technology's security performance of fuel assembly, increase the target of safety allowance, and prevent that cooling medium from swashing the problem that fuel rod and foreign matter enter fuel assembly of washing away of penetrating.
The utility model is to solve the problems of the technologies described above the technical scheme that adopts as described below:
A kind of bottom nozzle of fuel assembly comprises orifice plate, it is characterized in that: the surface of described orifice plate is arc surface, and orifice plate is provided with some circular discharge orifices.
Further, the hole shape of described circular discharge orifice dwindles from top to bottom gradually.
The beneficial effects of the utility model are as follows: the utility model is by arranging the bottom nozzle orifice plate of circular arc, effectively increased the cooling water inflow that enters reactor core, reduce the hydraulic hoist power of cooling medium, strengthened the cooling effect on fuel assembly surface, make thermal technology's security performance and the safety allowance of fuel assembly obtain larger raising, and the design by the discharge orifice shape prevent that cooling medium from swashing to penetrate and wash away fuel rod and foreign matter enters fuel assembly.
Description of drawings
Fig. 1 is existing bottom nozzle diagrammatic cross-section;
Fig. 2 is circular arc orifice plate bottom nozzle diagrammatic cross-section of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described.
For the Optimum Hydraulic performance, strengthen cooling medium to the cooling effect of fuel assembly in transport process, physical construction for bottom nozzle, the present invention proposes a kind of circular arc orifice plate design proposal, thereby realize improving thermal technology's security performance of fuel assembly, increase the target of safety allowance, and prevent that cooling medium from swashing the problem that fuel rod and foreign matter enter fuel assembly of washing away of penetrating.
The bottom nozzle of fuel assembly of the present utility model as shown in Figure 2, comprises orifice plate 1, and the surface of described orifice plate 1 is arc surface, and orifice plate 1 is provided with some circular discharge orifices 2, and the hole shape of described circular discharge orifice 2 dwindles from top to bottom gradually.
In one embodiment, the bottom nozzle of circular arc orifice plate of the present utility model, on the orifice plate 1 of the arcuate surface of bottom nozzle, circular discharge orifice 2 is set, Fig. 1 is existing bottom nozzle diagrammatic cross-section, compare Fig. 1 as can be known, the perforated area of discharge orifice 2 of the present utility model is greatly improved than the perforated area of flat panel, the hole shape of discharge orifice 2 is following little top large, this design can prevent that cooling medium from forming sharp penetrating and washing away fuel rod, by controlling the bore size of discharge orifice 2, prevent that foreign matter from entering fuel assembly.
The utility model is by arranging the bottom nozzle orifice plate of arcuate surface, effectively increased the cooling water inflow that enters reactor core, reduce the hydraulic hoist power of cooling medium, strengthened the cooling effect on fuel assembly surface, make thermal technology's security performance and the safety allowance of fuel assembly obtain larger raising, and the design by the discharge orifice shape prevent that cooling medium from swashing to penetrate and wash away fuel rod and foreign matter enters fuel assembly.
It should be noted that; above-mentioned specific embodiment is only exemplary; under above-mentioned instruction of the present utility model, those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion all drop in protection domain of the present utility model.It will be understood by those skilled in the art that top specific descriptions just in order to explain the purpose of this utility model, is not for restriction the utility model.Protection domain of the present utility model is limited by claim and equivalent thereof.
Claims (2)
1. the bottom nozzle of a fuel assembly, comprise orifice plate (1), it is characterized in that: the surface of described orifice plate (1) is arc surface, and orifice plate (1) is provided with some circular discharge orifices (2).
2. the bottom nozzle of a kind of fuel assembly as claimed in claim 1, it is characterized in that: the hole shape of described circular discharge orifice (2) dwindles from top to bottom gradually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206279823U CN203013278U (en) | 2012-11-23 | 2012-11-23 | Down tube seat of fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206279823U CN203013278U (en) | 2012-11-23 | 2012-11-23 | Down tube seat of fuel assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203013278U true CN203013278U (en) | 2013-06-19 |
Family
ID=48604845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012206279823U Expired - Fee Related CN203013278U (en) | 2012-11-23 | 2012-11-23 | Down tube seat of fuel assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203013278U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200851A (en) * | 2014-09-16 | 2014-12-10 | 中国科学院合肥物质科学研究院 | Supporting grid framework for fuel rod of wire winding assembly of liquid heavy metal cooled reactor |
| CN109036591A (en) * | 2017-06-08 | 2018-12-18 | 中广核工程有限公司 | Nuclear reactor |
| CN112185600A (en) * | 2020-09-30 | 2021-01-05 | 中国核动力研究设计院 | Nuclear reactor lower cavity stepped flow distribution device and distribution structure |
| CN112185597A (en) * | 2020-09-30 | 2021-01-05 | 中国核动力研究设计院 | In-reactor flow distribution device and distribution assembly of nuclear power station reactor |
-
2012
- 2012-11-23 CN CN2012206279823U patent/CN203013278U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104200851A (en) * | 2014-09-16 | 2014-12-10 | 中国科学院合肥物质科学研究院 | Supporting grid framework for fuel rod of wire winding assembly of liquid heavy metal cooled reactor |
| CN109036591A (en) * | 2017-06-08 | 2018-12-18 | 中广核工程有限公司 | Nuclear reactor |
| CN109036591B (en) * | 2017-06-08 | 2021-10-15 | 中广核工程有限公司 | Nuclear reactor core |
| CN112185600A (en) * | 2020-09-30 | 2021-01-05 | 中国核动力研究设计院 | Nuclear reactor lower cavity stepped flow distribution device and distribution structure |
| CN112185597A (en) * | 2020-09-30 | 2021-01-05 | 中国核动力研究设计院 | In-reactor flow distribution device and distribution assembly of nuclear power station reactor |
| CN112185600B (en) * | 2020-09-30 | 2022-02-01 | 中国核动力研究设计院 | Nuclear reactor lower cavity stepped flow distribution device and distribution structure |
| CN112185597B (en) * | 2020-09-30 | 2022-02-01 | 中国核动力研究设计院 | In-reactor flow distribution device and distribution assembly of nuclear power station reactor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130619 Termination date: 20201123 |