CN207731665U - A kind of fixed two-sided cooling annular fuel rod in lower end - Google Patents
A kind of fixed two-sided cooling annular fuel rod in lower end Download PDFInfo
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- CN207731665U CN207731665U CN201721772722.4U CN201721772722U CN207731665U CN 207731665 U CN207731665 U CN 207731665U CN 201721772722 U CN201721772722 U CN 201721772722U CN 207731665 U CN207731665 U CN 207731665U
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- annular fuel
- fuel rod
- fixed
- end plug
- sided cooling
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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 kind of fixed two-sided cooling annular fuel rod in lower end.The annular fuel rod includes upper end plug, lower end plug, interior involucrum, outer envelope, annular fuel pellet；Wherein, the cavity that interior involucrum and outer envelope are nested to form is used for accommodating annular fuel pellet, and upper end plug, the lower end plug of lower section connection are connected above interior involucrum and outer envelope；The lower end plug of the annular fuel rod is fixed on by eyelets on bottom nozzle.The utility model annular fuel rod is fixed on by eyelets on bottom nozzle, and the chucking power for avoiding the spring that fuel rod is clamped in operational process reduces, and fuel rod is caused to fall the problem of damaging fuel rod on bottom nozzle.The utility model annular fuel rod, the two-sided cooling of energy is that is, inside and outside to have coolant circulation, is cooled down to fuel rod.Compared with existing PWR Fuel stick, fuel heat transfer area increases 50%, and fuel pellet maximum temperature reduces 1000 DEG C, and linear power density increases 20%~50%, and flow resistance reduces 20%.
Description
Technical field
The utility model is related to technical field of nuclear power, and in particular to a kind of fuel rod is fixed further to a kind of lower end
The two-sided cooling annular fuel rod of formula.
Background technology
In nuclear power plant reactor operational process, the performance of nuclear fuel be influence nuclear reactor safety and economy it is important because
Element.Therefore the research of fuel element is placed on status very outstanding always in the world, by optimizing fuel element design, using
The methods of advanced configuration material, improvement component manufacturing process, are continuously improved the various performances of nuclear fuel element, promote nuclear power to more
Safe and more economical direction is developed.
Usual nuclear fuel is designed as solid cylindrical, is made of upper and lower end plug, pellet, holddown spring and involucrum, cold
But agent is flowed through outside involucrum, is cooled down to fuel rod.
Existing PWR fuel assembly design in, fuel rod generally using grid spacer be clamped it is hanging by the way of, down tube
Seat supports entire fuel assembly by control rod guide pipe.Requirement of this design to grid spacer is relatively high.It is transported in reactor
In the capable end of term, since the chucking power of the spring of the effect clamping fuel rod of irradiation can strongly reduce, fuel rod can generally be fallen under
On tube socket, under the mobilization of coolant, fuel rod may upper and lower play, this can lead to the risk of fuel rod breakage.
Compared with traditional solid cylindrical fuel, the benefit of annular fuel is under very high linear density, in fuel
The temperature of the heart is still very low, and the energy storage in fuel is less, and fission gas release is less.Under expectable normal operation and transient condition
Fuel performance is preferable.It there are no document both at home and abroad and report be disclosed in detail to annular fuel rod concrete structure.
Invention content
The purpose of this utility model is to provide it is a kind of can two-sided cooling and lower end easy to process simple in structure it is fixed
Two-sided cooling annular fuel rod.
Realize the technical solution of the utility model aim：A kind of fixed two-sided cooling annular fuel rod in lower end, the annular
Fuel rod includes upper end plug, lower end plug, interior involucrum, outer envelope, annular fuel pellet；Wherein, interior involucrum and outer envelope nested shape
At cavity be used for accommodating annular fuel pellet, connection upper end plug, the lower end plug of lower section connection above interior involucrum and outer envelope；It is described
The lower end plug of annular fuel rod be fixed on bottom nozzle by eyelets.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in annular fuel rod length with it is interior
Involucrum internal diameter ratio is (400~600)：1, annular fuel rod length is (200~350) with outer envelope outer diameter ratio：1.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in interior involucrum outer surface and ring
The internal surface gaps of shape fuel pellet are 0.02~0.1mm；The inner surface of the outer envelope and the appearance of annular fuel pellet
Face gap is 0.03~0.15mm.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in eyelets on or under
End plug is avoided being provided with 2 to 6 side opening at welding position, and it is end plug stream from the bottom up to prevent stifled stream, coolant.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in annular fuel rod lower end plug
It is fixed on bottom nozzle by eyelets, eyelets upper end spiral is connected to the outer surface of lower end plug, and tubulose is solid
It includes that spiral is connected, snapped connection, C-shaped ring or pin connect to determine the fixed form that part lower end is fixed on bottom nozzle.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in upper end plug or lower end table beyond the Great Wall
Face carries chamfering structure.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in eyelets outer surface band
There is chamfering structure.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in annular fuel pellet upper end peace
Equipped with holddown spring.Described holddown spring one end is withstood on annular fuel pellet, and the other end is withstood in upper end plug, is compressing bullet
Under the thrust of spring, annular fuel pellet is pressed on lower end beyond the Great Wall.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in upper end plug on can be arranged 1
Air-filled pore pours helium by what the inside involucrum of the air-filled pore and outer envelope were nested to form for accommodating in the cavity of fuel pellet
Gas.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in upper end plug by argon arc welding or
Electron beam weldering is connect with interior involucrum and outer envelope；The lower end plug passes through argon arc welding or electron beam weldering and interior involucrum and outer envelope
Connection.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in annular fuel rod heat transfer area
It is 0.6-2 with volume of fuel ratio.
A kind of fixed two-sided cooling annular fuel rod in lower end as described above, described in annular fuel rod highest average
Power is 30-50kW/m；Annular fuel pellet maximum temperature is reduced to 500 DEG C.
A kind of annular fuel component described in the utility model, the annular fuel component include upper tube socket, bottom nozzle, annular
Fuel rod, grid spacer and guide pipe, described in annular fuel rod use the fixed two-sided cooling ring in any of the above-described lower end
Shape fuel rod.
The effect of the utility model is：The utility model annular fuel rod is fixed on bottom nozzle by eyelets
On, the chucking power for avoiding the spring that fuel rod is clamped in operational process reduces, and causes fuel rod to fall and damages combustion on bottom nozzle
The problem of charge bar, play above and below fuel rod when preventing coolant from being flowed up by fuel assembly avoid result in fuel rod breakage
Risk；Eyelets outer surface carries chamfering structure with chamfering structure, upper end plug or lower end outer surface, can prevent
It is hooked with grid spacer etc. when pull-rod.Fuel rod is attached with certain intensity by welding manner and is easy to add
Work.The fixed two-sided cooling annular fuel rod in lower end described in the utility model, the two-sided cooling of energy are that is, inside and outside to have cooling
Agent is circulated, and is cooled down to fuel rod.Compared with existing PWR Fuel stick structure, fuel heat transfer area increases 50%, fuel
Pellet maximum temperature reduces 1000 DEG C, and linear power density increases 20%~50%, and flow resistance reduces 20%.
Description of the drawings
A kind of Fig. 1 fixed two-sided cooling annular fuel rod structural schematic diagrams in lower end described in the utility model.
In figure：1. upper end plug；Involucrum in 2.；3. outer envelope；4. holddown spring；5. annular fuel pellet；6. lower end plug；7.
Eyelets.
Specific implementation mode
In the following with reference to the drawings and specific embodiments to a kind of fixed two-sided cooling annular in lower end described in the utility model
Fuel rod is further described.
Embodiment 1
As shown in Figure 1, the fixed two-sided cooling annular fuel rod in a kind of lower end described in the utility model, the annular fuel
Stick includes upper end plug 1, lower end plug 6, interior involucrum 2, outer envelope 3, annular fuel pellet 5；Wherein, interior involucrum 2 is nested with outer envelope 3
The cavity of formation is used for accommodating annular fuel pellet 5, and interior involucrum 2 connects upper end plug 1 with 3 top of outer envelope by argon arc welding, interior
Involucrum 2 connects down end plug 6 with 3 lower section of outer envelope by argon arc welding.
The annular fuel rod is fixed on by eyelets 7 on bottom nozzle；The eyelets upper end spiral connects
It is connected on the outer surface of lower end plug 6；Eyelets lower end spiral is fastened on bottom nozzle.
Holddown spring 4 is mounted on 5 upper end of annular fuel pellet, and providing thrust in transport prevents fuel pellet play, keeps away
Exempt to cause fuel pellet damaged.
1 air-filled pore is set in upper end plug, is used to accommodate by what the inside involucrum of the air-filled pore and outer envelope were nested to form
Helium is poured in the cavity of fuel pellet.
The annular fuel rod length is 500 with interior involucrum internal diameter ratio：1, annular fuel rod length and outer envelope outer diameter
Than being 300：1；
The outer surface of the interior involucrum and the internal surface gaps of annular fuel pellet are 0.05mm；
The inner surface of the outer envelope and the outer surface gap of annular fuel pellet are 0.08mm.
The annular fuel rod heat transfer area is 0.6-2 with volume of fuel ratio；Annular fuel rod highest average power is
30-50kW/m；5 maximum temperature of annular fuel pellet is reduced to 500 DEG C.
On the eyelets 7 or lower end plug 6 is avoided being provided with 2 to 6 side opening at welding position, prevents from blocking up
Stream, coolant are end plug stream from the bottom up.
Embodiment 2
As shown in Figure 1, the fixed two-sided cooling annular fuel rod in a kind of lower end described in the utility model, the annular fuel
Stick includes upper end plug 1, lower end plug 6, interior involucrum 2, outer envelope 3, annular fuel pellet 5；Wherein, interior involucrum 2 is nested with outer envelope 3
The cavity of formation is used for accommodating annular fuel pellet 5, interior involucrum 2 and 3 top energization beamlet of outer envelope weldering connection upper end plug 1, interior
Involucrum 2 and 3 lower section of outer envelope pass through end plug 6 under electron beam weldering connection.
The annular fuel rod is fixed on by eyelets 7 on bottom nozzle；The eyelets upper end spiral connects
It is connected on the outer surface of lower end plug 6；Eyelets lower end is fixed on bottom nozzle, and fixed form includes spiral connection, buckle company
It connects, the connection of C-shaped ring or pin.
Holddown spring 4 is mounted on 5 upper end of annular fuel pellet, and providing thrust in transport prevents fuel pellet play, keeps away
Exempt to cause fuel pellet damaged.Described 4 one end of holddown spring is withstood on annular fuel pellet 5, and the other end withstands on upper end plug 1
On, under the thrust of holddown spring 4, annular fuel pellet 5 is pressed on lower end beyond the Great Wall.
1 air-filled pore is set in upper end plug, is used to accommodate by what the inside involucrum of the air-filled pore and outer envelope were nested to form
Helium is poured in the cavity of fuel pellet.
The annular fuel rod length is 400 with interior involucrum internal diameter ratio：1, annular fuel rod length and outer envelope outer diameter
Than being 200：1；
The outer surface of the interior involucrum and the internal surface gaps of annular fuel pellet are 0.02mm；
The inner surface of the outer envelope and the outer surface gap of annular fuel pellet are 0.03mm.
The annular fuel rod heat transfer area is 0.6-2 with volume of fuel ratio；Annular fuel rod highest average power is
30-50kW/m；5 maximum temperature of annular fuel pellet is reduced to 500 DEG C.
7 outer surface of eyelets carries chamfering structure.
The upper end plug or lower end outer surface carries chamfering structure.
2 to 6 side opening are provided on the eyelets 7, it is end plug stream from the bottom up to prevent stifled stream, coolant.
Embodiment 3
As shown in Figure 1, the fixed two-sided cooling annular fuel rod in a kind of lower end described in the utility model, the annular fuel
Stick includes upper end plug 1, lower end plug 6, interior involucrum 2, outer envelope 3, annular fuel pellet 5；Wherein, interior involucrum 2 is nested with outer envelope 3
The cavity of formation is used for accommodating annular fuel pellet 5, interior involucrum 2 and 3 top of outer envelope and passes through argon arc welding or electron beam weldering connection
Upper end plug 1, interior involucrum 2 and 3 lower section of outer envelope pass through end plug 6 under argon arc welding or electron beam weldering connection.
The annular fuel rod is fixed on by eyelets 7 on bottom nozzle；The eyelets upper end spiral connects
It is connected on the outer surface of lower end plug 6；Eyelets lower end is fixed on bottom nozzle, and fixed form includes spiral connection, buckle company
It connects, the connection of C-shaped ring or pin.
Holddown spring 4 is mounted on 5 upper end of annular fuel pellet, and providing thrust in transport prevents fuel pellet play, keeps away
Exempt to cause fuel pellet damaged.
1 air-filled pore is set in upper end plug, is used to accommodate by what the inside involucrum of the air-filled pore and outer envelope were nested to form
Helium is poured in the cavity of fuel pellet.
The annular fuel rod length is 600 with interior involucrum internal diameter ratio：1, annular fuel rod length and outer envelope outer diameter
Than being 350：1；
The outer surface of the interior involucrum and the internal surface gaps of annular fuel pellet are 0.1mm；
The inner surface of the outer envelope and the outer surface gap of annular fuel pellet are 0.15mm.
The annular fuel rod heat transfer area is 0.6-2 with volume of fuel ratio；Annular fuel rod highest average power is
30-50kW/m；5 maximum temperature of annular fuel pellet is reduced to 500 DEG C.
The lower end plug 6 is avoided being provided with 2 to 6 side opening at welding position, and it is from the bottom up to prevent stifled stream, coolant
End plug stream.
Embodiment 4
A kind of annular fuel component, the annular fuel component include upper tube socket, bottom nozzle, annular fuel rod, grid spacer
And guide pipe, the annular fuel rod is using the fixed two-sided cooling annular in any lower end described in embodiment 1 or 2 or 3
Fuel rod.
Embodiment 5
A kind of reactor uses annular fuel component, which includes upper tube socket, bottom nozzle, annular combustion
Charge bar, grid spacer and guide pipe；Annular fuel rod described in it is fixed using any lower end described in embodiment 1 or 2 or 3
The two-sided cooling annular fuel rod of formula.
Claims (15)
1. a kind of fixed two-sided cooling annular fuel rod in lower end, which includes upper end plug (1), lower end plug (6), interior
Involucrum (2), outer envelope (3), annular fuel pellet (5)；It is characterized in that：The interior involucrum (2) and outer envelope (3) nested shape
At cavity be used for accommodating annular fuel pellet (5), connect upper end plug (1) above interior involucrum (2) and outer envelope (3), lower section connects
Connect lower end plug (6)；The lower end plug (6) of the annular fuel rod is fixed on by eyelets (7) on bottom nozzle.
2. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：The ring
Shape fuel rod length is (400~600) with interior involucrum internal diameter ratio：1, annular fuel rod length and outer envelope outer diameter ratio be (200~
350)：1.
3. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：Described is interior
The outer surface of involucrum and the internal surface gaps of annular fuel pellet are 0.02~0.1mm；The inner surface and ring of the outer envelope
The outer surface gap of shape fuel pellet is 0.03~0.15mm.
4. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：The pipe
On shape fixing piece (7) or lower end plug (6) is avoided being provided with 2 to 6 side opening at welding position, prevents stifled stream, coolant be from
Lower past upper end plug stream.
5. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：The ring
The lower end plug (6) of shape fuel rod is fixed on by eyelets (7) on bottom nozzle, and eyelets (7) upper end spiral connects
Be connected on the outer surface of lower end plug (6), eyelets (7) lower end be fixed on the fixed form on bottom nozzle include spiral connection,
It snaps connection, the connection of C-shaped ring or pin.
6. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：Described is upper
End plug (1) or lower end plug (6) outer surface carry chamfering structure.
7. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：The pipe
Shape fixing piece (7) outer surface carries chamfering structure.
8. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：The ring
Shape fuel pellet (5) upper end is equipped with holddown spring (4).
9. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 7, it is characterised in that：The pressure
Tight spring (4) one end is withstood on annular fuel pellet (5), and the other end is withstood in upper end plug (1), the thrust in holddown spring (4)
Under effect, annular fuel pellet (5) is pressed on lower end beyond the Great Wall.
10. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：Described
1 air-filled pore can be set in upper end plug (1), be used to accommodate fuel by what the inside involucrum of the air-filled pore and outer envelope were nested to form
Helium is poured in the cavity of pellet.
11. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：Described
Upper end plug (1) is connect by argon arc welding or electron beam weldering with interior involucrum and outer envelope；The lower end plug (6) by argon arc welding or
Electron beam weldering is connect with interior involucrum and outer envelope.
12. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：Described
Annular fuel rod heat transfer area is 0.6-2 with volume of fuel ratio.
13. the fixed two-sided cooling annular fuel rod in a kind of lower end according to claim 1, it is characterised in that：Described
Annular fuel rod highest average power is 30-50kW/m；Annular fuel pellet (5) maximum temperature is reduced to 500 DEG C.
14. a kind of annular fuel component, the annular fuel component include upper tube socket, bottom nozzle, annular fuel rod, grid spacer with
And guide pipe, it is characterised in that：The annular fuel rod is fixed two-sided using any lower end described in claim 1 to 13
Cooling annular fuel rod.
15. a kind of reactor uses annular fuel component, which includes upper tube socket, bottom nozzle, annular fuel
Stick, grid spacer and guide pipe；It is characterized in that：The annular fuel rod is using any described in claim 1 to 13
The fixed two-sided cooling annular fuel rod in lower end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772722.4U CN207731665U (en) | 2017-12-19 | 2017-12-19 | A kind of fixed two-sided cooling annular fuel rod in lower end |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721772722.4U CN207731665U (en) | 2017-12-19 | 2017-12-19 | A kind of fixed two-sided cooling annular fuel rod in lower end |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207731665U true CN207731665U (en) | 2018-08-14 |
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ID=63098793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721772722.4U Active CN207731665U (en) | 2017-12-19 | 2017-12-19 | A kind of fixed two-sided cooling annular fuel rod in lower end |
Country Status (1)
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| CN (1) | CN207731665U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935350A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of fixed two-sided cooling annular fuel rod in lower end |
| CN114083102A (en) * | 2021-11-29 | 2022-02-25 | 中国原子能科学研究院 | Fuel target and welding method thereof |
| CN115116629A (en) * | 2022-05-11 | 2022-09-27 | 中国原子能科学研究院 | Annular fuel end plug, annular fuel assembly and welding method |
-
2017
- 2017-12-19 CN CN201721772722.4U patent/CN207731665U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109935350A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of fixed two-sided cooling annular fuel rod in lower end |
| CN109935350B (en) * | 2017-12-19 | 2024-07-02 | 中国原子能科学研究院 | Lower-end-fixed double-sided cooling annular fuel rod |
| CN114083102A (en) * | 2021-11-29 | 2022-02-25 | 中国原子能科学研究院 | Fuel target and welding method thereof |
| CN115116629A (en) * | 2022-05-11 | 2022-09-27 | 中国原子能科学研究院 | Annular fuel end plug, annular fuel assembly and welding method |
| CN115116629B (en) * | 2022-05-11 | 2024-05-10 | 中国原子能科学研究院 | Annular fuel end plug, annular fuel assembly and welding method |
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