CN208400501U - A kind of modular fuel assembly - Google Patents
A kind of modular fuel assembly Download PDFInfo
- Publication number
- CN208400501U CN208400501U CN201821160425.9U CN201821160425U CN208400501U CN 208400501 U CN208400501 U CN 208400501U CN 201821160425 U CN201821160425 U CN 201821160425U CN 208400501 U CN208400501 U CN 208400501U
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- fuel assembly
- assembly module
- fuel
- short tube
- module
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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 relates to a kind of modular fuel assemblies, including a first fuel assembly module (1), several the second fuel assembly modules (2), a third fuel assembly module (3) being from top to bottom successively alternatively cascaded；The top of the first fuel assembly module (1) is equipped with upper tube socket (4), and the bottom end of the third fuel assembly module (3) is equipped with bottom nozzle (5)；The first fuel assembly module (1), the second fuel assembly module (2), third fuel assembly module (3) fuel slug (7) all the same by grid spacer (6) setting quantity and position, are equipped with for several guiding short tubes (8) by control rod and for an instrument short tube (9) by measuring instrumentss in heap.Using a kind of modular fuel assembly described in the utility model, reduces in core unloading and wasting of resources when defect needs to replace occurs for fuel rod, improve the economy of nuclear power.
Description
Technical field
The utility model belongs to fuel assembly design field, and in particular to a kind of modular fuel assembly.
Background technique
Fuel assembly is the energy source of nuclear reactor, is the core component that chain reaction of nuclear fission occurs and generates energy.Previous generation
It has recorded since the fifties, large quantities of nuclear reactors created operation in succession and are connected to the grid, by more than 60 years development nuclear energy power generation technologies
Gradually mature, the construction of nuclear reactor realizes standardization and commercialization, and standardization has also been done step-by-step in the design of fuel assembly
And seriation.PWR fuel assembly common at present is no element cell type fuel assembly, can be divided into 14 according to fuel rod arrangement
× 14-20 × 20 is rectangular and the types such as hexagon, wherein the rectangular fuel assembly with 17 × 17 is in the great majority.
Typical 17 × 17 rectangular PWR fuel assembly is made of fuel rod and fuel assembly skeleton, and fuel assembly bone
Frame is then made of upper and lower tube socket, grid spacer, guide pipe and gauge pipe, wherein fuel rod 264 in total, upper and lower tube socket each one
It is a, grid spacer 8, guide pipe 24, gauge pipe 1.Fuel rod is by zirconium alloy cladding, uranium dioxide pellet, air cavity spring
And upper and lower end plug is constituted, and is had the function of generating thermal energy and is passed it to coolant and contain fission product；Upper tube socket
Upper structure part of the component as fuel assembly, function are to provide coolant outlet cavity, and to C&P systems and other
Reactor core associated component provides protection；Down tube base member is the bottom structure part of fuel assembly, it guides coolant to flow into fuel stack
Part, and the transverse load and axial load that fuel assembly is subject to are transmitted in lower core plate；Grid spacer is for clamping fuel
Stick makes it keep mutual horizontal spacing and the axial spacing between upper and lower tube socket；Guide pipe for accommodate control rod and
Other reactor core associated component sticks；Gauge pipe is located at component center lattice cell position, it provides channel for measuring instrumentss in heap.
When fuel assembly is run in heap, the fuel linear power density along fuel assembly short transverse be it is different, this
When final fuel assembly necessarily being caused to draw off reactor core, fuel assembly is different, portion along the burnup of short transverse different location
The fuel burn-up that quartile is set is also very low, and following entire component to draw off reactor core together the fuel that these burnups are in reduced levels is
A kind of waste to resource, also reduces the economy of nuclear power indirectly.
When fuel assembly is run in heap, it may occur that it is damaged the defects of, general way is at present, dismantles upper tube
Then seat is extracted damaged fuel rod out of grid spacer, replace a new fuel rod, but fuel rod breakage is
One point, as soon as the waste that whole fuel rod is also a kind of pair of resource is replaced because of the breakage of point.Fuel assembly exists simultaneously
When operation it can also happen that the defects of bulge, fuel rod outer diameter becomes larger in this case, can not extract from grid spacer, can lead
The failure for causing entire fuel assembly also forms the waste to resource.
Utility model content
In view of the deficiencies in the prior art, the purpose of this utility model is to propose that a kind of modular fuel assembly is set
Meter, will be able to achieve component in discharging, the deeper module of burnup is drawn off, the shallower module of fuel can still rest on heap in-core
It continues to run, while being also able to achieve for the subsequent fuel assembly for generating defect, it is only necessary to replace damaged fuel slug or fuel
The function of assembly module.
To achieve the above objectives, the technical solution adopted in the utility model is: a kind of modular fuel assembly, wherein
Including be from top to bottom successively alternatively cascaded a first fuel assembly module, several the second fuel assembly moulds
Block, a third fuel assembly module；The top of the first fuel assembly module is equipped with upper tube socket, the third fuel assembly
The bottom end of module is equipped with bottom nozzle；The first fuel assembly module, the second fuel assembly module, third fuel assembly module are equal
By grid spacer setting quantity and position fuel slug all the same, it is equipped with for short by several guiding of control rod
It manages and for an instrument short tube by measuring instrumentss in heap.
Further, the fuel slug is vertically arranged on the grid spacer at rectangular, second fuel assembly
Grid spacer in module is located at the middle part of the second fuel assembly module.
Further, the guiding short tube and the instrument short tube are axial consistent with the fuel slug, and the instrument is short
Pipe is located at the center of the grid spacer.
Further, the lower end of the guiding short tube can be with the upper end shape for another guiding short tube being disposed below
At connection structure, and pass through the control rod；It the lower end of the instrument short tube can be with another instrument being disposed below
The upper end of table short tube forms connection structure, and passes through measuring instrumentss in the heap.
Further, the institute in the first fuel assembly module, the second fuel assembly module, third fuel assembly module
The both ends for stating guiding short tube and the instrument short tube exceed the both ends of the fuel slug.
The beneficial effects of the utility model are as follows:
It, can be according to each combustion in fuel assembly discharging 1. fuel assembly is formed by multiple fuel assembly module assembleds
Expect that the burnup situation of assembly module carries out the discharging of selectivity, the i.e. only deeper fuel assembly module of removal burnup, replaces with new
Fuel assembly module, while retaining the shallower fuel assembly module of other burnups, without the entire fuel assembly of removal；
2. can be navigated to where the fuel slug that defect occurs when defect occurs for some or certain several fuel slugs
Fuel assembly module, which is unloaded, according to the type of defect, single fuel slug is replaced in selection, or
Replace entire fuel assembly module；
3. reducing in core unloading and wasting of resources when defect needs to replace occurring for fuel rod, nuclear power is improved
Economy.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of modular fuel assembly described in specific embodiment of the present invention；
Fig. 2 is the schematic diagram of the first fuel assembly module described in specific embodiment of the present invention；
Fig. 3 is the schematic diagram of the second fuel assembly module described in specific embodiment of the present invention；
Fig. 4 is the schematic diagram of third fuel assembly module described in specific embodiment of the present invention；
In figure: 1- the first fuel assembly module, 2- the second fuel assembly module, 3- third fuel assembly module, 4- upper tube
Seat, 5- bottom nozzle, 6- grid spacer, 7- fuel slug, 8- are oriented to short tube, 9- instrument short tube, 10- connection structure.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of modular fuel assembly, by the first fuel assembly module 1, several second fuel assemblies
Module 2, third fuel assembly module 3 are composed in series.Concatenated sequence be a first fuel assembly module 1 from top to bottom,
2, third fuel assembly modules 3 of several the second fuel assembly modules；Each fuel assembly module can replace.
As shown in Figure 2,3, 4, the first fuel assembly module 1, the second fuel assembly module 2, third fuel assembly module 3 are equal
By the setting quantity of grid spacer 6 and position fuel slug 7 all the same, fuel slug 7 is vertically arranged in positioning at rectangular
On screen work 6；Wherein, the grid spacer in the second fuel assembly module 2 is located at the middle part of the second fuel assembly module 2.First combustion
Material assembly module 1, the second fuel assembly module 2, third fuel assembly module 3 are equipped with several guiding short tubes 8 and an instrument
Table short tube 9, guiding short tube 8 are used for through control rod and other reactor core associated component sticks, and instrument short tube 9 is used for through measurement in heap
Instrument.It is axial consistent with fuel slug 7 to be oriented to short tube 8 and instrument short tube 9, instrument short tube 9 is located at the centre bit of grid spacer 6
It sets.When assembled, guiding short tube 8, instrument short tube 9 and another fuel stack below of each fuel assembly module
Guiding short tube 8, the instrument short tube 9 of part module correspond.
As shown in Figure 1, 2, the top of the first fuel assembly module 1 is equipped with upper tube socket 4, as shown in Fig. 1,4, third fuel stack
The bottom end of part module 3 is equipped with bottom nozzle 5；
The lower end of the guiding short tube 8 of each fuel assembly module can be another with the fuel assembly module being disposed below
The upper end that root is oriented to short tube 8 forms connection structure 10, and passes through control rod；Under the instrument short tube 9 of each fuel assembly module
End can form connection structure 10 with the upper end of another instrument short tube 9 of the fuel assembly module being disposed below, and pass through
Measuring instrumentss in heap.The connection relationship of connection structure 10 is identical as the connection type of existing presurized water reactor conventional fuel component.
8 and of short tube is oriented in the first fuel assembly module 1, the second fuel assembly module 2, third fuel assembly module 3
The both ends of instrument short tube 9 exceed the both ends of fuel slug 7.In the modular fuel assembly being cascaded, each fuel
The upper and lower ends of fuel slug 7 in assembly module do not contact with the fuel slug 7 in other fuel assembly modules, and there are skies
Gap, fuel slug 7 will not lead to (the irradiation growth that contacts with each other directly with one another because of irradiation growth when ensure that operation in heap
Refer to that some materials show as the elongation and shortening of orientation under neutron irradiation, and the phenomenon that density is basically unchanged.)
Device described in the utility model is not limited to embodiment described in specific embodiment, those skilled in the art
Technical solution according to the present utility model obtains other embodiments, also belongs to the technological innovation scope of the utility model.
Claims (5)
1. a kind of modular fuel assembly, it is characterized in that: including one to be from top to bottom successively alternatively cascaded
First fuel assembly module (1), several the second fuel assembly modules (2), a third fuel assembly module (3)；Described
The top of one fuel assembly module (1) is equipped with upper tube socket (4), and the bottom end of the third fuel assembly module (3) is equipped with bottom nozzle
(5)；The first fuel assembly module (1), the second fuel assembly module (2), third fuel assembly module (3) pass through positioning
Quantity and position fuel slug (7) all the same is arranged in screen work (6), is equipped with several guiding short tubes for passing through control rod
(8) and for an instrument short tube (9) by measuring instrumentss in heap.
2. a kind of modular fuel assembly as described in claim 1, it is characterized in that: the fuel slug (7) is at rectangular
It is vertically arranged on the grid spacer (6), the grid spacer on the second fuel assembly module (2) is located at second combustion
Expect the middle part of assembly module (2).
3. a kind of modular fuel assembly as claimed in claim 2, it is characterized in that: the guiding short tube (8) and the instrument
Table short tube (9) is axial consistent with the fuel slug (7), and the instrument short tube (9) is located at the center of the grid spacer (6)
Position.
4. a kind of modular fuel assembly as claimed in claim 3, it is characterized in that: the lower end energy of guiding short tube (8)
Enough upper ends with another guiding short tube (8) being disposed below form connection structure (10), and pass through the control rod；
The lower end of the instrument short tube (9) can form connection knot with the upper end for another instrument short tube (9) being disposed below
Structure (10), and pass through measuring instrumentss in the heap.
5. a kind of modular fuel assembly as claimed in claim 4, it is characterized in that: in the first fuel assembly module
(1), the second fuel assembly module (2), guiding short tube (8) and the instrument short tube (9) described in third fuel assembly module (3)
Both ends exceed the both ends of the fuel slug (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821160425.9U CN208400501U (en) | 2018-07-19 | 2018-07-19 | A kind of modular fuel assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821160425.9U CN208400501U (en) | 2018-07-19 | 2018-07-19 | A kind of modular fuel assembly |
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| Publication Number | Publication Date |
|---|---|
| CN208400501U true CN208400501U (en) | 2019-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821160425.9U Active CN208400501U (en) | 2018-07-19 | 2018-07-19 | A kind of modular fuel assembly |
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| CN (1) | CN208400501U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110853773A (en) * | 2019-11-21 | 2020-02-28 | 中国核动力研究设计院 | Axial reverse-charging metal cooling reactor and management method |
-
2018
- 2018-07-19 CN CN201821160425.9U patent/CN208400501U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110853773A (en) * | 2019-11-21 | 2020-02-28 | 中国核动力研究设计院 | Axial reverse-charging metal cooling reactor and management method |
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