CN109994221A - A kind of nuclear fuel rod upper end plug - Google Patents
A kind of nuclear fuel rod upper end plug Download PDFInfo
- Publication number
- CN109994221A CN109994221A CN201711472319.4A CN201711472319A CN109994221A CN 109994221 A CN109994221 A CN 109994221A CN 201711472319 A CN201711472319 A CN 201711472319A CN 109994221 A CN109994221 A CN 109994221A
- Authority
- CN
- China
- Prior art keywords
- end plug
- fuel rod
- nuclear fuel
- big
- conical
- 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
- G21C3/02—Fuel elements
- G21C3/04—Constructional details
- G21C3/06—Casings; Jackets
- G21C3/10—End closures ; Means for tight mounting therefor
-
- 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
Abstract
The invention belongs to fuel element technical fields, and in particular to a kind of nuclear fuel rod upper end plug.This structure is the up-thin-low-thick shape structure that a centre is provided with through-hole, it is topmost upper end plug conical boss, it is upper end plug roundlet rod structure below upper end plug conical boss, it is the big cylinder of upper end plug below upper end plug small column, upper end plug small column and the big cylinder of upper end plug pass through the small conical surface and the big conical surface has carried out excessively, groove is formed in the small conical surface and big conical surface junction, groove and roundlet outer surface of column use conical transition；The big cylindrical base of upper end plug is machined with guiding surface；Upper end plug aeration aperture is provided among the upper end plug structure.It can quickly be scattered and disappeared by coming directly towards using end plug heat when this structure welding, avoid end plug from forming oxidation tint, on the other hand, after fuel rod is pulled in skeleton by lower end plug by fuel rod, operator can grab the groove of upper end plug by a pawl head, and reverse drawing fuel rod reaches specified position.
Description
Technical field
The invention belongs to fuel element technical fields, and in particular to a kind of nuclear fuel rod upper end plug.
Background technique
Fuel assembly longevity of service in reactor, for a long time by neutron irradiation, high temperature and pressure and corrosiveness, fuel
Stick is component part most basic and most crucial in fuel assembly.The end plug of fuel rod is mainly used to seal fuel rod.
In order to reduce the inside and outside differential pressure of cladding tubes during reactor operation, prevent the creep of cladding tubes from collapsing and fuel rod
Heat transfer property, fuel rod upper end is plugged with an aeration aperture, and when fuel rod seals plug-hole spot welding, 2~3Mpa is filled with into pipe
Pure helium, when element manipulation is to close to Shou Qishi, helium should be the same as outside cladding tubes plus the gross pressure of fission gas in cladding tubes
Coolant working pressure it is close.
Summary of the invention
The purpose of the present invention is in view of the foregoing defects the prior art has, provide a kind of nuclear fuel rod upper end plug, a side
The face end plug conical surface can form preferable contact surface with top, and end plug heat can quickly be scattered and disappeared by coming directly towards when welding, avoid
End plug forms oxidation tint, and on the other hand, after fuel rod is pulled in skeleton by lower end plug by fuel rod, operator can pass through
One pawl head grabs the groove of upper end plug, and reverse drawing fuel rod reaches specified position.
Technical scheme is as follows:
A kind of nuclear fuel rod upper end plug, this structure are the up-thin-low-thick shape structure that a centre is provided with through-hole, topmost
It is upper end plug roundlet rod structure below upper end plug conical boss for upper end plug conical boss, the outer diameter of upper end plug small column is greater than
Upper end plug conical boss, is the big cylinder of upper end plug below upper end plug small column, and upper end plug small column and the big cylinder of upper end plug are from upper
And carried out excessively by the small conical surface and the big conical surface down, groove, groove and small column are formed in the small conical surface and big conical surface junction
Outer surface uses conical transition；
The big cylinder lower outer diameter of upper end plug reduces, and forms boss and cladding tubes mating surface, cladding tubes mating surface and cladding tubes
Internal diameter interference fit, the big cylindrical base of upper end plug are machined with guiding surface；
Upper end plug aeration aperture, upper end plug aeration aperture and the excessive face in upper end plug upper surface are provided among the upper end plug structure
For circular cone table top, three are formd in upper end plug aeration aperture and upper end plug surface connection procedure and connect excessive structural, from top to bottom
It is initially formed a circular cone table top, a cylindrical surface is then formed, finally re-forms a flat circular cone table top.
A kind of nuclear fuel rod upper end plug, the upper end plug conical boss top outer diameter are 2.4 ± 0.1mm of Φ.
A kind of nuclear fuel rod upper end plug, the outer diameter of the upper end plug small column are 6.5 ± 0.03mm of Φ.
The angle of a kind of nuclear fuel rod upper end plug, the big conical surface and vertical direction should be controlled at 137 ° ± 0.5 °.
A kind of nuclear fuel rod upper end plug, the groove width are more than or equal to 0.4mm.
The outer diameter of a kind of nuclear fuel rod upper end plug, the big cylinder of upper end plug is consistent with involucrum pipe outside diameter.
A kind of nuclear fuel rod upper end plug, the cladding tubes mating surface and involucrum bore are interference fitted, and magnitude of interference is
0.1mm。
A kind of nuclear fuel rod upper end plug, the diameter of the upper end plug aeration aperture is in Φ 1mm or so.
The beneficial effects of the present invention are:
Upper end of the invention is plugged with stronger solderability, shows newly to design by a large amount of soldering test and production practices
End plug insertion cladding tubes after, end plug and Φ 9.5mm involucrum form good cooperation, postwelding welding section flawless, inflatable and super
The defects of crossing the stomata of technical requirements, end plug appearance non-oxidation color, welding quality are preferable.On the other hand, by field test, on
The groove of end plug can provide possibility for fuel rod reverse drawing.
Detailed description of the invention
Fig. 1 is upper end plug schematic diagram of the invention.
In figure: 1, upper end plug conical boss；2, upper end plug aeration aperture；3, upper end plug small column；4, groove；5, the big conical surface；
6, the big cylinder of upper end plug；7, cladding tubes mating surface；8, guiding surface；9, the small conical surface.
Specific embodiment
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Nuclear fuel rod upper end plug of the invention is the up-thin-low-thick shape structure that a centre is provided with through-hole, in this structure
It is topmost upper end plug conical boss 1,1 top outer diameter of upper end plug conical boss is 2.4 ± 0.1mm of Φ.When fuel rod is blocked up
When hole is welded, which is conducive to weld striking success.Upper end plug conical boss 1 is upper end plug roundlet rod structure, upper end below
The outer diameter for filling in small column 3 is greater than upper end plug conical boss 1, and outer diameter should be between 6.5 ± 0.03mm of Φ, when diameter is too small, end plug
Intensity is inadequate, in end plug reverse drawing, may cause end plug fracture；Diameter is excessive, and fuel rod grasps it when carrying out pull-rod side by side
Between can generate interference again.
Upper end plug small column 3 is the big cylinder 6 of upper end plug below, and upper end plug small column 3 and the big cylinder 6 of upper end plug are from top to bottom
It has been carried out excessively by the small conical surface 9 and the big conical surface 5, the angle of the big conical surface 5 and vertical direction should be controlled at 137 ° ± 0.5 °, the ruler
Very little required precision is high, and when plug-hole welding and boxing are welded, which plays positioning and heat spreading function.In the small conical surface 9 and auger
5 junction of face forms groove 4, and 4 width of groove should be greater than being equal to 0.4mm.It is by end plug under fuel rod that fuel rod, which pulls in skeleton,
It realizes, but pulls out beyond after processing range, the groove 4 of upper end plug, reverse drawing fuel rod can be passed through.To guarantee that matter is welded in boxing
Amount, groove 4 and roundlet outer surface of column use conical transition.
Big 6 lower outer diameter of cylinder of upper end plug reduces, and forms boss and cladding tubes mating surface 7, when fuel rod pulls in skeleton,
The outer diameter of the big cylinder 6 of upper end plug is consistent with involucrum pipe outside diameter, avoids causing to damage to lattice cell.Cladding tubes mating surface 7 and cladding tubes
Internal diameter interference fit.The control of its magnitude of interference influences boxing welding quality very big in 0.1mm, the magnitude of interference.
Big 6 bottom of cylinder of upper end plug is machined with guiding surface 8, by the guiding surface 8, is conducive to end plug indentation involucrum
Pipe.
Upper end plug aeration aperture 2, upper end plug aeration aperture 2 and upper end plug upper surface are provided among upper end plug structure of the invention
Excessive face is circular cone table top, forms three in upper end plug aeration aperture 2 and upper end plug surface connection procedure and connect excessive structural, from
It is initially formed a circular cone table top under above, a cylindrical surface is then formed, finally re-forms a flat circular cone table top.Upper end
Fill in the diameter of aeration aperture 2 in Φ 1mm or so, the not Ying Tai little of upper end plug aeration aperture 2, in boxing welding, the upper end plug aeration aperture 2
Be conducive to air in fuel rod to be discharged；And before plug-hole welding, it is the channel that helium is filled with into fuel rod again, and upper end plug is filled
The also not Ying Tai great of stomata 2, is unfavorable for greatly very much plug-hole welding fabrication.
Claims (8)
1. a kind of nuclear fuel rod upper end plug, this structure is the up-thin-low-thick shape structure that a centre is provided with through-hole, and feature exists
In: the upper end plug is topmost upper end plug conical boss (1), and upper end plug conical boss (1) is upper end plug small column knot below
The outer diameter of structure, upper end plug small column (3) is greater than upper end plug conical boss (1), and upper end plug small column (3) is upper end plug great circle below
Column (6), upper end plug small column (3) and the big cylinder of upper end plug (6) pass through the small conical surface (9) and the big conical surface (5) carries out
Excessively, groove (4) are formed in the small conical surface (9) and the big conical surface (5) junction, groove (4) and roundlet outer surface of column use circular cone mistake
It crosses；
Upper end plug big cylinder (6) lower outer diameter reduces, and forms boss and cladding tubes mating surface (7), cladding tubes mating surface (7) and packet
Casing inside diameter interference fit, the big cylinder of upper end plug (6) bottom is machined with guiding surface (8)；
It is provided among the upper end plug structure upper end plug aeration aperture (2), upper end plug aeration aperture (2) and upper end plug upper surface are excessive
Face is circular cone table top, forms three in upper end plug aeration aperture (2) and upper end plug surface connection procedure and connect excessive structural, from upper
It is initially formed a circular cone table top under and, then forms a cylindrical surface, finally re-forms a flat circular cone table top.
2. a kind of nuclear fuel rod upper end plug as described in claim 1, it is characterised in that: upper end plug conical boss (1) top
Portion's outer diameter is 2.4 ± 0.1mm of Φ.
3. a kind of nuclear fuel rod upper end plug as described in claim 1, it is characterised in that: outside the upper end plug small column (3)
Diameter is 6.5 ± 0.03mm of Φ.
4. a kind of nuclear fuel rod upper end plug as described in claim 1, it is characterised in that: the big conical surface (5) and vertical direction
Angle should control at 137 ° ± 0.5 °.
5. a kind of nuclear fuel rod upper end plug as described in claim 1, it is characterised in that: groove (4) width is more than or equal to
0.4mm。
6. a kind of nuclear fuel rod upper end plug as described in claim 1, it is characterised in that: outside the big cylinder of upper end plug (6)
Diameter is consistent with involucrum pipe outside diameter.
7. a kind of nuclear fuel rod upper end plug as described in claim 1, it is characterised in that: the cladding tubes mating surface (7) and packet
Casing inside diameter interference fit, magnitude of interference 0.1mm.
8. a kind of nuclear fuel rod upper end plug as described in claim 1, it is characterised in that: the upper end plug aeration aperture (2) it is straight
Diameter is in Φ 1mm or so.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711472319.4A CN109994221A (en) | 2017-12-29 | 2017-12-29 | A kind of nuclear fuel rod upper end plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711472319.4A CN109994221A (en) | 2017-12-29 | 2017-12-29 | A kind of nuclear fuel rod upper end plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109994221A true CN109994221A (en) | 2019-07-09 |
Family
ID=67108475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711472319.4A Pending CN109994221A (en) | 2017-12-29 | 2017-12-29 | A kind of nuclear fuel rod upper end plug |
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| Country | Link |
|---|---|
| CN (1) | CN109994221A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276265A (en) * | 2019-12-31 | 2020-06-12 | 中国核动力研究设计院 | Rod-type fuel element using uranium-yttrium hydride fuel |
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| CN85105728A (en) * | 1985-07-27 | 1987-01-21 | 西屋电气公司 | Has the nuclear reactor fuel rod that improves the end plug assembly |
| CN85101508A (en) * | 1985-04-01 | 1987-01-24 | 西屋电器公司 | Improvement to plug for fuel pipe |
| US4865804A (en) * | 1984-05-02 | 1989-09-12 | Westinghouse Electric Corp. | Fuel rod end plug |
| JPH07244179A (en) * | 1994-03-07 | 1995-09-19 | Nuclear Fuel Ind Ltd | Upper end plug of fuel rod |
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| US20080137798A1 (en) * | 2006-10-18 | 2008-06-12 | Westinghouse Electric Company, Llc | Tube-in-tube threaded dashpot end plug |
| CN103157892A (en) * | 2011-12-14 | 2013-06-19 | 中核建中核燃料元件有限公司 | Fuel element rod plug-pressing-welding integration method |
| CN203055469U (en) * | 2013-02-04 | 2013-07-10 | 中国核动力研究设计院 | Lower end plug of fuel rod and fuel rod |
| CN104520936A (en) * | 2012-04-17 | 2015-04-15 | 巴布科克和威尔科克斯M能量股份有限公司 | Resistance welding of an end cap for nuclear fuel rods |
| CN105983783A (en) * | 2014-11-27 | 2016-10-05 | 韩电原子力燃料株式会社 | Laser welding apparatus for spacer grid |
| CN106531262A (en) * | 2016-12-26 | 2017-03-22 | 中核北方核燃料元件有限公司 | Assembly method of annular fuel element |
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| CN105983783A (en) * | 2014-11-27 | 2016-10-05 | 韩电原子力燃料株式会社 | Laser welding apparatus for spacer grid |
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| CN207883324U (en) * | 2017-12-29 | 2018-09-18 | 中核建中核燃料元件有限公司 | A kind of nuclear fuel rod upper end plug |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111276265A (en) * | 2019-12-31 | 2020-06-12 | 中国核动力研究设计院 | Rod-type fuel element using uranium-yttrium hydride fuel |
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