CN203055469U - Lower end plug of fuel rod and fuel rod - Google Patents
Lower end plug of fuel rod and fuel rod Download PDFInfo
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- CN203055469U CN203055469U CN201320062442XU CN201320062442U CN203055469U CN 203055469 U CN203055469 U CN 203055469U CN 201320062442X U CN201320062442X U CN 201320062442XU CN 201320062442 U CN201320062442 U CN 201320062442U CN 203055469 U CN203055469 U CN 203055469U
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- fuel rod
- end plug
- cock body
- utility
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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 discloses a lower end plug of a fuel rod, which comprises a plug body B, wherein the lower end part of the plug body B is provided with two bendable fixed bodies in opposite directions. The utility model also discloses a fuel rod adopting the lower end plug. The lower end plug of the fuel rod and the fuel rod have the advantages that the defect that in the installation process of the existing fuel rod and the existing lower end plug, deformation of a rod bundle grid plate can be cause so that the verticality of the fuel rod is difficultly ensured, and the support of an external structure is needed so as to prevent the fuel rod form sliding can be overcome.
Description
Technical field
The utility model relates to reactor fuel assemblies, is specifically related to end plug and fuel rod under a kind of fuel rod.
Background technology
Fuel rod is the core component that constitutes the fuel assembly cluster, passes to cooling medium, contains fuel and fission product for generation of heat energy and with it.
Fuel rod mainly is made of involucrum pipe, upper end plug, following end plug and pellet.Pellet is arranged at involucrum pipe inside, and upper end plug and following end plug are arranged at involucrum pipe two ends.Main two effect of upper end plug and following end plug: the one, thus clog involucrum pipe two ends sealing pellet; The 2nd, for the assembling of the fixing and fuel assembly cluster of fuel rod provides architecture basics.The axial location function of fuel rod is born by grid spacer in the presurized water reactor.Grid spacer clamping fuel rod also provides axial and cross-brace, and the maintenance fuel rod is in the normal separation between screen work lattice cell center and the fuel rod.But the shortcoming that supports fuel rod by grid spacer is, but as the spacing of fuel rod hour (as about 1mm), the placement of grid spacer is just extremely difficult.
In fast reactor, fuel rod is realized axial location by being fixed on the cluster screen, and three kinds of implementations are arranged: screw thread is fixed, welds fixing and mosaic is fixed.Screw thread is fixed as end plug insertion cluster screen under the fuel rod, by fuel rod lower end screw thread and nut beyond the Great Wall fuel rod is fixed on the cluster screen.But this structure can make cooling medium significantly reduce by the runner of cluster screen, makes resistance become very big, so fast reactor seldom adopts this location structure.More be that the fixing and mosaic of welding is fixed as fuel rod axial limiting is provided in the present fast reactor.Fig. 1 is the structural representation of welded type end plug, and its bottom is provided with notch, and the cluster screen inserts in this notch, then by end plug is connected with the cluster screen.But welding is easy to cause the distortion of cluster screen, and said structure is difficult to guarantee that fuel rod is perpendicular to screen.Fig. 2 is the structural representation of inserted end plug, and the bottom of inserted end plug offers the notch of special shape, and this notch is inlaid in the guide tracked screen with respective cross-section, and fuel rod pushes along guide tracked screen.This location structure has bigger coolant flow passages, but the prerequisite that realizes is that fuel rod exists sexangle outer tube or similar structures outward, otherwise fuel rod can skid off this location structure narrow application range along guide tracked screen.
Fuel rod owing to be heated and irradiation, the situation of thermal expansion and axial elongation can occur when work, no matter adopt above-mentioned which kind of fixed form, fuel rod itself all can't be reserved the space of its expansion of a confession and axial elongation.
The utility model content
First purpose of the present utility model namely is to provide end plug under a kind of fuel rod, needs welded and installed to overcome existing end plug down, or needs sexangle outer tube or similar structures to cooperate the deficiency that could fix.
First purpose of the present utility model is achieved through the following technical solutions:
End plug under a kind of fuel rod comprises cock body B, and the bottom of described cock body B is relatively set with two bent fixed bodies.When mounted, make two fixed bodies run through the duct of reactor lower connecting plate, break fixed body into two with one's hands to both sides then, make the fixed body bending, the fixed orifice of fixed body and cluster stationary grid closely cooperates, thus the slip of fuel limitation rod.The problem that the cluster screen is out of shape and the fuel rod verticality is difficult to guarantee that the utility model has avoided welding to bring under the situation that does not need external structure to support, can prevent that also fuel rod from sliding simultaneously.
As first kind of prioritization scheme of the present utility model, described fixed body is provided with weak point.This weak point makes the bending of fixed body be more prone to, and has improved mounting process of the present utility model.The thickness of this weak point is less than the thickness at other position of fixed body.
As second kind of prioritization scheme of the present utility model, the bottom of described cock body B is provided with transition conical surface B, makes the utility model not aiming at fully under the situation in cluster stationary grid duct, also can insert smoothly, the convenient installation.
As second kind of prioritization scheme of the present utility model, design the diameter of described cock body B upper end greater than the diameter of described cock body B bottom.Because the space in the cluster stationary grid duct is comparatively narrow, this structure can conveniently be installed, and saves the space.Cock body B upper end diameter can make more greatly that the utility model is easier to be contacted with the involucrum pipe, is convenient to welding.
Second purpose of the present utility model namely is to provide a kind of fuel rod, this fuel rod adopts above-mentioned end plug down, in installation process, can cause the distortion of cluster screen to overcome existing fuel rod, be difficult to guarantee the fuel rod verticality, need external structure support to prevent the deficiency of its slip.
Second purpose of the present utility model is achieved through the following technical solutions:
A kind of fuel rod mainly is made up of pellet and involucrum pipe, and pellet is fixed in involucrum pipe inside, also comprises above-mentioned any one following end plug, and the bottom of described cock body B is connected with an end of involucrum pipe, also comprises upper end plug, and upper end plug is connected with the other end of involucrum pipe.
As first kind of prioritization scheme of the present utility model, upper end plug comprises cock body A, the upper end of described cock body A offers rectangular channel A, the degree of depth of rectangular channel A can the based on fuel rod installation dimension set, after making the fuel rod installation in position, there is certain interval between the cluster screen of the bottom of rectangular channel A and its insertion, for expansion and the elongation of fuel rod provides the space.Rectangular channel A also plays the effect that prevents that fuel rod from rotating in addition.Weld by the pressure electric resistance welding between end plug and the involucrum pipe, be to adapt to the pressure electric resistance welding, the frustum of a cone that the bottom design of cock body A has the cylindrical section that is slightly larger than the involucrum bore and diameter to reduce gradually from top to bottom.Frustum of a cone tip designs has step surface, can play the effect of supporting fuel pellet or air cavity spring.
In sum, advantage of the present utility model and beneficial effect are:
1. installation process does not relate to welding, has avoided causing the distortion of cluster screen, is difficult to guarantee the problem of fuel rod verticality, the installation accuracy height;
2. do not need specific external structure support can prevent sliding stop, widely applicable;
3. upper end plug is preset with for the expansion of fuel rod and the space of elongation, prevents from because of the variation of fuel rod volume damage being caused in reactor inside;
4. can well realize spacing to fuel rod preventing that fuel rod from sliding and rotation.
Description of drawings
In order to be illustrated more clearly in embodiment of the present utility model, will make simple explanation to the required accompanying drawing of using among description the utility model embodiment below.Apparent, the accompanying drawing in describing below only is some embodiment that put down in writing in the utility model, to those skilled in the art, under the situation of not paying creative work, can also obtain other accompanying drawing according to following accompanying drawing.
Fig. 1 is the structural representation of welded type end plug;
Fig. 2 is the structural representation of inserted end plug;
Fig. 3 is the structural representation of the utility model fuel rod upper end plug;
Fig. 4 is the structural representation of end plug under the utility model fuel rod;
Fig. 5 is the mounting structure synoptic diagram A of the utility model fuel rod;
Fig. 6 is the mounting structure synoptic diagram B of the utility model fuel rod;
Wherein, the parts title of Reference numeral correspondence is as follows:
1-cock body A, 2-rectangular channel A, the 3-frustum of a cone, the 4-step, 5-transition conical surface A, 6-cock body B, the 7-fixed body, the 8-weak point, 9-transition conical surface B, 10-involucrum pipe, 11-locatees rib, the last cluster screen of 12-, 13-fixed orifice, cluster screen under the 14-.
Embodiment
In order to make those skilled in the art understand the utility model better, below in conjunction with the accompanying drawing among the utility model embodiment the technical scheme among the utility model embodiment is carried out clear, complete description.Apparent, embodiment described below only is the part among the utility model embodiment, rather than all.Based on the embodiment of the utility model record, other all embodiment that those skilled in the art obtain under the situation of not paying creative work are all in the scope of the utility model protection.
Embodiment 1:
As shown in Figure 4, end plug under a kind of fuel rod comprises cock body B6, and the bottom of described cock body B6 is relatively set with two bent fixed bodies 7.When mounted, make two fixed bodies 7 run through the duct of reactor lower connecting plate, break fixed body 7 then to both sides into two with one's hands, make fixed body 7 bendings, fixed body 7 closely cooperates with the duct of reactor lower connecting plate, thus the slip of fuel limitation rod.The problem that the cluster screen is out of shape and the fuel rod verticality is difficult to guarantee that present embodiment has avoided welding to bring under the situation that does not need external structure to support, can prevent that also fuel rod from sliding simultaneously.
Embodiment 2:
As shown in Figure 4, present embodiment arranges weak point 8 at fixed body 7 on the basis of embodiment 1.This weak point 8 makes the bending of fixed body 7 be more prone to, and has improved mounting process of the present utility model.The thickness of this weak point 8 is less than the thickness at fixed body 7 other positions.
Embodiment 3:
As shown in Figure 4, present embodiment is provided with transition conical surface B9 in the bottom of cock body B6 on the basis of embodiment 1 or embodiment 2, makes present embodiment not aiming at fully under the situation in cluster screen duct, also can insert smoothly, the convenient installation.
Embodiment 4:
As shown in Figure 4, present embodiment designs the diameter of described cock body B6 upper end greater than the diameter of described cock body B6 bottom on the basis of embodiment 1, embodiment 2 or embodiment 3.Because the space in the cluster screen duct is comparatively narrow, this structure can conveniently be installed, and saves the space.Cock body B6 upper end diameter can make more greatly that present embodiment is easier to be contacted with the involucrum pipe, is convenient to welding.
Embodiment 5:
As shown in Figure 5 and Figure 6, a kind of fuel rod, mainly formed by pellet and involucrum pipe 10, pellet is fixed in involucrum pipe 10 inside, it is characterized in that: also comprise any described end plug down among the embodiment 1 ~ 4, the upper end of described cock body B6 is connected with an end of involucrum pipe 10, also comprises upper end plug, and upper end plug is connected with the other end of involucrum pipe 10.As shown in Figure 6, in the fixed orifice 13 of cluster screen 14, break fixed body 7 then into two with one's hands to both sides under two fixed bodies 7 of cock body B6 insert, make fixed body 7 bendings.Can well fix present embodiment like this.Upper end plug can adopt existing mode to fix.
Embodiment 6:
As shown in Figure 3, present embodiment is on the basis of embodiment 5, upper end plug comprises cock body A1, the upper end of described cock body A1 offers rectangular channel A2, the degree of depth of rectangular channel A2 can the based on fuel rod installation dimension set, after making the fuel rod installation in position, the bottom of rectangular channel A2 and insert between wherein the cluster screen and have certain interval is for expansion and the elongation of fuel rod provides the space.Weld by the pressure electric resistance welding between present embodiment and the involucrum pipe, be to adapt to the pressure electric resistance welding, the frustum of a cone 3 that the bottom design of cock body A1 has the cylindrical section that is slightly larger than the involucrum bore and diameter to reduce gradually from top to bottom.Frustum of a cone tip designs has step surface 4, can play the effect of supporting fuel pellet or air cavity spring.
As shown in Figure 5, in the location rib 11 on the rectangular channel A2 of the cock body A1 insertion cluster screen 12, wherein there is the gap between the bottom of rectangular channel A2 and the location rib 11.In described cock body A1 upper end transition conical surface A5 is set.The effect of transition conical surface A5 is, under the situation about not aligning fully in present embodiment and insertion position, also can conveniently insert, and improved the mounting process of present embodiment.
As mentioned above, just can realize the utility model preferably.
Claims (6)
1. end plug under the fuel rod comprises cock body B(6), it is characterized in that: bottom described cock body B(6) is relatively set with two bent fixed bodies (7).
2. end plug under a kind of fuel rod according to claim 1, it is characterized in that: described fixed body (7) is provided with weak point (8).
3. end plug under a kind of fuel rod according to claim 1, it is characterized in that: bottom described cock body B(6) is provided with transition conical surface B(9).
4. end plug under a kind of fuel rod according to claim 1, it is characterized in that: described cock body B(6) diameter of upper end is greater than described cock body B(6) diameter of bottom.
5. fuel rod, mainly formed by pellet and involucrum pipe (10), pellet is fixed in involucrum pipe (10) inside, it is characterized in that: also comprise any described end plug down in the claim 1 ~ 3, described cock body B(6) upper end is connected with an end of involucrum pipe (10), also comprise upper end plug, upper end plug is connected with the other end of involucrum pipe (10).
6. a kind of fuel rod according to claim 5, it is characterized in that: described upper end plug comprises cock body A(1), described cock body A(1) upper end offers rectangular channel A(2), described cock body A(1) the bottom comprise the step (4) of the frustum of a cone (3) that diameter reduces from top to bottom gradually and the bottom surface that is arranged at the frustum of a cone (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320062442XU CN203055469U (en) | 2013-02-04 | 2013-02-04 | Lower end plug of fuel rod and fuel rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320062442XU CN203055469U (en) | 2013-02-04 | 2013-02-04 | Lower end plug of fuel rod and fuel rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203055469U true CN203055469U (en) | 2013-07-10 |
Family
ID=48738397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320062442XU Expired - Lifetime CN203055469U (en) | 2013-02-04 | 2013-02-04 | Lower end plug of fuel rod and fuel rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203055469U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109994221A (en) * | 2017-12-29 | 2019-07-09 | 中核建中核燃料元件有限公司 | A kind of nuclear fuel rod upper end plug |
| 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 |
-
2013
- 2013-02-04 CN CN201320062442XU patent/CN203055469U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109994221A (en) * | 2017-12-29 | 2019-07-09 | 中核建中核燃料元件有限公司 | A kind of nuclear fuel rod upper end plug |
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130710 |