CN117428307B - End plug for resistance welding of nuclear fuel rod and fuel rod - Google Patents
End plug for resistance welding of nuclear fuel rod and fuel rod Download PDFInfo
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- CN117428307B CN117428307B CN202311567281.4A CN202311567281A CN117428307B CN 117428307 B CN117428307 B CN 117428307B CN 202311567281 A CN202311567281 A CN 202311567281A CN 117428307 B CN117428307 B CN 117428307B
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- 238000003466 welding Methods 0.000 title claims abstract description 112
- 239000000446 fuel Substances 0.000 title claims abstract description 47
- 239000003758 nuclear fuel Substances 0.000 title claims abstract description 21
- 238000005253 cladding Methods 0.000 claims abstract description 51
- 230000004927 fusion Effects 0.000 claims abstract description 9
- 230000007704 transition Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 abstract description 20
- 230000008569 process Effects 0.000 abstract description 20
- 230000008093 supporting effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
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- 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
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
本发明公开了一种用于核燃料棒电阻焊接的端塞，端塞本体中部带有用于和包壳管实现电阻焊接的焊接区，焊接区在朝远离包壳管方向带有依次同轴连接的第一圆台段、第二圆台段和第三圆台段；第二圆台段的外径尺寸位于包壳管内径和外径尺寸之间；第一圆台段、第二圆台段和第三圆台段三者之间，第一圆台段外径最小，第二圆台段的外径最大；端塞本体位于包壳管内的内端还带有和第一圆台段同轴连接的第四圆台段，第四圆台段的外径小于包壳管内径，且位于第一圆台段和第二圆台段外径尺寸之间。采用本方案，能够有效地控制焊接熔合区熔合线长度和角度，以及焊缝凸出高度，并能够限制焊接过程焊瘤的流动，避免焊瘤与燃料棒内部燃料柱或气腔弹簧接触。
The present invention discloses an end plug for resistance welding of nuclear fuel rods, wherein the middle part of the end plug body is provided with a welding zone for resistance welding with a cladding tube, and the welding zone is provided with a first truncated cone section, a second truncated cone section and a third truncated cone section which are coaxially connected in sequence in a direction away from the cladding tube; the outer diameter of the second truncated cone section is between the inner diameter and the outer diameter of the cladding tube; among the first truncated cone section, the second truncated cone section and the third truncated cone section, the outer diameter of the first truncated cone section is the smallest, and the outer diameter of the second truncated cone section is the largest; the inner end of the end plug body located in the cladding tube is also provided with a fourth truncated cone section which is coaxially connected with the first truncated cone section, and the outer diameter of the fourth truncated cone section is smaller than the inner diameter of the cladding tube, and is between the outer diameters of the first truncated cone section and the second truncated cone section. By adopting this scheme, the length and angle of the fusion line of the welding fusion zone and the protruding height of the weld can be effectively controlled, and the flow of the weld nodules during the welding process can be restricted to avoid the weld nodules from contacting the fuel column or the air cavity spring inside the fuel rod.
Description
Technical Field
The invention relates to the technical field of nuclear reactor fuel elements, in particular to an end plug for resistance welding of a nuclear fuel rod and the fuel rod.
Background
The nuclear reactor fuel elements are typically formed from cladding tubes and upper and lower end plugs encapsulating fuel pellets. The individual fuel rods thus formed are then inserted into a framework having a clamping support structure to form a fuel assembly. During the in-stack operation, the weld quality of the welds at the upper and lower ends of the fuel rod and their integrity are key quality characteristics that ensure that fission products within the fuel rod do not leak. As the resistance welding adopts a non-melting welding mode, compared with the traditional TIG or EB and other melting welding, the resistance welding has the self welding characteristics. Therefore, in order to ensure the quality of the welding seam of the resistance welding and the safety of the operation in the fuel rod stack, the matched end plugs are designed according to the resistance welding mode and the welding and forming characteristics thereof, and the reliable connection with the cladding is realized through the resistance welding.
A document relatively close to the present invention is "resistance welding of end caps for nuclear fuel rods" (patent No. CN 104520936A), the weld-line length formed in the end cap and cladding tube at the later stage of welding cannot be determined by visual inspection, and the weld strength after welding needs to be checked destructively.
The effect of document 1 on the formation of weld flash on the exterior of the cladding tube of the plug during resistance welding is to use a flash build-up design with annular grooves arranged in the plug at corresponding locations to receive the weld flash. While the inside lug pile up of the cladding in the resistance welding process is influenced, the document 1 is provided with a certain accommodating space through the inside diameter-reducing round table, but the round table needs a certain height to ensure that the inside lug in the axial direction is not contacted with other parts due to the fact that the inside diameter-reducing round table only needs a certain height, and meanwhile, the inside diameter-reducing round table is inevitably larger due to the fact that a certain space is needed in the radial direction for accommodating the lug, so that the supporting effect of the round table on parts such as an inside fuel column or an air cavity spring is weakened, and even the round table cannot support, such as the supporting tube is placed inside. In addition, the end plug of document 1 is provided with a chamfer or a radius at the contact portion with the cladding tube for the purpose of upsetting in the welding process, and the chamfer or radius is limited in length.
Thus, there is a need for an end plug for nuclear fuel rod resistance welding that improves the quality of the weld.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and aims to provide an end plug for resistance welding of a nuclear fuel rod and the fuel rod, the length and the angle of a fusion line of a welding fusion zone and the protruding height of a welding seam can be effectively controlled, and the flow of weld flash in the welding process can be limited, so that the weld flash is prevented from being contacted with a fuel column or an air cavity spring in the fuel rod.
The invention is realized by the following technical scheme:
An end plug for resistance welding of nuclear fuel rods, comprising an end plug body;
The middle part of the end plug body is provided with a welding area for realizing resistance welding with the cladding tube, and the welding area is provided with a first circular table section, a second circular table section and a third circular table section which are sequentially and coaxially connected in the direction far away from the cladding tube;
The outer diameter of the first round table section is minimum, and the outer diameter of the second round table section is maximum among the first round table section, the second round table section and the third round table section;
The end plug body is located the inner of cladding tube still have with first round platform section coaxial coupling's fourth round platform section, the external diameter of fourth round platform section is less than the cladding tube internal diameter, and be located between first round platform section and the external diameter size of second round platform section.
Compared with the prior art, the welding seam welding line formed in the later welding stage of the end plug and the cladding tube in the document 1 cannot be determined through appearance inspection, and the welding seam strength after welding needs to pass destructive inspection; meanwhile, as a certain space is required in the radial direction for accommodating the weld flash, the diameter reduction of the inner circular table is necessarily larger, so that the supporting effect of the circular table on parts such as an inner fuel column or an air cavity spring is weakened, and even the supporting effect cannot be achieved, for example, the problems of supporting tube placement and the like are solved, the invention provides an end plug for resistance welding of a nuclear fuel rod; aiming at the problems that the length of a welding line formed in the later welding stage of an end plug and a cladding tube in document 1 cannot be determined through appearance inspection, and the strength of the welding line after welding needs to be checked through destructiveness, the scheme indirectly ensures the length of the welding line and the strength of the welding line after welding through the end plug and the height of a second circular table section of a whole welding area covered by the welding line, shortens the production process flow, saves related checking equipment, improves the production effect and saves the production cost on the premise of ensuring the quality of the welding line.
While in the case of the end plug of document 1, the effect of forming a weld flash outside the cladding tube during resistance welding is achieved by the flash stacking design of arranging annular grooves in the corresponding positions of the end plug to receive the weld flash outside, the truncated cone requires a certain height to ensure that the inner flash in the axial direction is not in contact with other components, due to the reduced diameter truncated cone. Meanwhile, as a certain space is required in the radial direction for accommodating the weld flash, the diameter of the inner circular truncated cone is necessarily larger, the supporting effect of the circular truncated cone on parts such as an inner fuel column or an air cavity spring is weakened, and even the circular truncated cone cannot be supported, for example, the problem of supporting the pipe is solved by placing the inner circular truncated cone, a groove with a certain depth is formed between the first circular truncated cone section and the second circular truncated cone section and between the first circular truncated cone section and the fourth circular truncated cone section, the groove can provide an accommodating space for the weld flash formed by upsetting in the resistance welding process, namely, the redundant weld flash flows downwards to the lower part of the step through the stepped circular truncated cone with the fall so as to avoid accumulation of the weld flash, and the outer diameter of a welding seam is prevented from being overlarge; the end of the end plug is provided with a fourth round bench section with the diameter slightly smaller than the inner diameter of the cladding, a groove is formed between the fourth round bench section and a stepped round bench of a welding area while a sufficient supporting surface is provided for parts such as a fuel column or an air cavity spring in the cladding, so that internal weld flash generated in the welding process can be contained, the round bench can also block the axial flow of the internal weld flash, and the weld flash is prevented from being contacted with the parts such as the fuel column, the air cavity spring and the like in the cladding.
The end plug and the cladding tube contact position in the scheme are right angles, and the right angle contact does not influence the contact pressure and the upsetting forming of resistance welding. And secondly, the outer diameter of the third round table is slightly smaller than that of the second round table, so that a certain space is provided for upsetting deformation in the resistance welding process, and the height of the outer diameter of the welding seam, which is caused by upsetting deformation, protruding out of the outer diameter of the cladding tube is controlled.
Therefore, the technical scheme aims to realize reliable connection of resistance welding between the cladding and the end plug under the structural characteristics of the existing fuel element, and ensure the performance quality of weld joint strength, tightness, corrosion resistance and the like formed between the cladding and the end plug so as to ensure the manufacturing quality of the fuel rod and the running performance in the fuel rod.
In a further development, the end plug body has a gripping area in the portion thereof located outside the cladding tube, said gripping area having an annular recess for receiving a gripper, through which annular recess the end plug body is intended to be gripped in cooperation with the gripper.
According to a further scheme, one end of the annular groove, which faces the welding area, is coaxially connected with a grabbing head grabbing guide section, the other end of the annular groove is coaxially connected with a grabbing head grabbing contact section, the outer diameters of the grabbing head grabbing guide section and the grabbing head grabbing contact section are gradually increased in a direction away from the annular groove, the grabbing head grabbing guide section and the grabbing head grabbing contact section are mainly matched with corresponding grabbers to achieve grabbing and drawing installation of a fuel rod, and inclined planes with certain inclination angles are formed on grabbing head grabbing guide surfaces and grabbing head grabbing contact surfaces, so that shrinkage and expansion of grabbing heads in a grabbing process are facilitated, and a guiding effect is achieved.
In a further scheme, a clamping area is coaxially connected between the grabbing guide section of the grabbing head and the third round platform section, the clamping area comprises a clamping section for clamping the electrode clamp head, and the clamping section is used for providing a contact surface for the clamp in the welding process.
In a further scheme, the clamping section is in a round table shape, the outer diameter of the clamping section is smaller than that of the third round table section, the end part, facing the clamping section, of the third round table section is provided with a rounding angle, and the side, close to the top end of the end plug, of the third round table section is subjected to large-size rounding treatment so as to prevent hooking in the process of grabbing and pulling the fuel rod.
In a further scheme, the clamping section is in a truncated cone shape, the large-diameter end of the clamping section is connected with the third truncated cone section, the small-diameter end of the clamping section is connected with the grabbing head grabbing guide section, the outer diameter of the large-diameter end of the clamping section is identical to that of the third truncated cone section, the outer diameter of the small-diameter end of the clamping section is identical to that of the grabbing head grabbing guide section, the third truncated cone section in the stepped truncated cone of the resistance welding area is not rounded near the top end side of the end plug, and a conical inclined plane is formed by chamfering the direct inclined plane of the clamping section to the third truncated cone section so as to play a role in guiding and preventing hooking.
In a further scheme, the outer end of the end plug body is further provided with a guide area, the guide area comprises a first conical table section, the large-diameter end of the first conical table section is connected with the grabbing contact section through a transition round table, the small-diameter end of the first conical table section is provided with a ball gap, and the guide area is used for mainly guiding and being easily contained by a grabbing tool in the fuel rod installation process.
In a further scheme, a transition cone bench is coaxially connected between the ball segment and the small diameter end of the first cone bench, the large diameter end of the transition cone bench is connected with the small diameter end of the first cone bench, the outer diameters are the same, the outer diameters of the small diameter end of the transition cone bench and the end face of the ball segment are the same, and a transition cone bench with a shorter height is added between the first cone bench and the ball segment so as to smooth transition between the first cone bench and the ball segment.
In a further scheme, a second conical bench section is coaxially connected between the first conical bench section and the second conical bench section, the large diameter end of the second conical bench section is connected with the end part of the second conical bench section, the outer diameters are the same, the small diameter end of the second conical bench section is connected with the end part of the first conical bench section, and the outer diameters are the same.
In a further scheme, the fuel rod comprises a cladding tube, end plugs are welded at the port positions of the cladding tube in a resistance welding mode, a fourth round platform section at the inner end of each end plug is supported at the end part of a fuel column or an air cavity spring in the cladding tube, in the scheme, the upper end plug is adopted, and a fuel pellet and an air cavity spring are packaged in a space formed by the end plug and the cladding through pressure resistance welding, so that a rod-shaped fuel element is finally formed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. The middle welding part of the end plug adopts a stepped round table, and the outer diameter of the second round table section welded with the cladding tube is larger than that of the third round table section for accommodating upsetting deformation in the resistance welding process and providing auxiliary functions. Therefore, the length of a fusion zone formed after welding is easily and indirectly checked and controlled through the height of upsetting deformation of the second round platform section, and further the strength of the welding seam is monitored. Compared with the welding seam formed by the end plugs used for pressure resistance welding of the existing fuel rod, the strength of the welding seam can be ensured without checking the width and the height of the welding seam. Meanwhile, the fusion length of the welded seam can be changed by adopting a bevel chamfer connection mode between the first round table section and the second round table section, so that a certain effect is played on improving the strength of the welded seam;
2. the middle welding part of the end plug adopts a stepped truncated cone, the outer diameter of the third truncated cone section is slightly smaller than that of the second truncated cone section, a certain drop depth is formed between the third truncated cone section and the second truncated cone section, a certain flow space can be provided for a weld flash formed in the resistance welding process, and the height of the outer diameter of a welding seam protruding out of the outer diameter of the cladding tube due to upsetting deformation is controlled;
3. the middle welding part of the end plug adopts a stepped circular table, one end of a third circular table section close to the top end of the end plug adopts a large-size rounding, and the rounding plays a role in guiding and preventing hooking in the process of pulling a fuel rod;
4. the end of the end plug is designed by adopting a short circular truncated cone, namely a fourth circular truncated cone section, and forms a groove with a certain depth with the first circular truncated cone section and the second circular truncated cone section. The end plane of the spring can also provide support for a fuel column or an air cavity spring in the fuel rod cladding;
5. The end plug top end comprises two parts, wherein one part consists of an annular groove containing a gripping tool, a gripping head gripping guide surface and a gripping head gripping contact surface, the other part mainly cooperates with the corresponding gripping tool to achieve gripping and drawing installation of a fuel rod, the other part consists of a first conical table section, a spherical gap formed by rounding the top end and a transitional conical table section between the first conical table section and the spherical gap, and the other part mainly plays a role in guiding and is easy to be contained by the gripping tool in the installation process of the fuel rod.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic view of an end plug according to embodiment 1 of the present invention;
fig. 2 is a schematic structural view of an end plug according to embodiment 2 of the present invention;
fig. 3 is a schematic view of the structure of an end plug according to embodiment 3 of the present invention;
FIG. 4 is a schematic illustration of a fuel rod according to one embodiment of the present invention.
In the drawings, the reference numerals and corresponding part names:
1-guiding area, 11-segment, 12-first cone stage, 13-transition cone stage, 2-grabbing area, 21-annular groove, 22-grabbing head grabbing guiding section, 23-grabbing head grabbing contact section, 3-clamping section, 4-welding area, 41-first round stage, 42-second round stage, 43-third round stage and 5-fourth round stage.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
Example 1:
As shown in fig. 1, the end plug for resistance welding of a nuclear fuel rod comprises a guiding area 1 with a guiding function at the top end of the end plug, a grabbing area 2, a clamping section 3 for clamping an electrode chuck in the middle of the end plug, a welding area 4 for resistance welding, and a fourth circular table section 5 with a gas supporting function at the tail end of the end plug. The end plug is made of the same type of zirconium alloy material as the cladding.
The end plug top guiding zone 1 is formed by a top segment 11, a first conical segment 12 and a transition conical segment 13 between them. The grabbing area 2 is formed by an annular groove 21 for accommodating a grabbing tool, a grabbing head guide surface and a grabbing contact surface of the grabbing tool, the grabbing head grabbing guide surface and the grabbing head grabbing contact surface are inclined planes with a certain inclination angle, retracting and expanding of the grabbing head in the grabbing process are facilitated, and a guiding effect is achieved. The middle clamping section 3 of the end plug is formed by a round table with a certain height, and a contact surface is provided for the clamp in the welding process. The welding zone 4 is formed by a stepped circular truncated cone, wherein the outer diameter of the first circular truncated cone 41 is the smallest, the second circular truncated cone 42 is a welding implementation part, the outer diameter of the second circular truncated cone is the largest, the third circular truncated cone 43 is an auxiliary welding part of the stepped circular truncated cone, a groove formed between the first circular truncated cone 41 and the second circular truncated cone 42 can provide a containing space for a weld neck formed in the welding process, the outer diameter of the second circular truncated cone 42 is a value between the inner diameter and the outer diameter of a cladding tube, the height of the second circular truncated cone 42 can monitor the length of a welding seam fusion zone formed after welding, the outer diameter of the third circular truncated cone 43 is slightly smaller than the outer diameter of the second circular truncated cone 42 for controlling the height of the weld neck in the auxiliary welding process, a certain flowing space is provided for the weld neck, and meanwhile, the third circular truncated cone 43 is close to the top end plug side and is subjected to large-size rounding treatment so as to prevent hooking in the process of a fuel rod, whether the welded seam is qualified or not can be judged through the end welding zone 4, and the effect of ensuring that the welding cannot cause influence on a fuel cavity spring in the fuel rod can be caused. The fourth round bench section 5 at the tail end of the end plug is formed by a round bench with a diameter smaller than the inner diameter of the cladding and a smaller height, one surface of the end plug, which is contacted with the fuel column or the air cavity spring, is a horizontal surface, can provide stable axial support, and one surface of the end plug, which is connected with the stepped round bench, can play a role in blocking weld flash formed in the welding process, and prevent the weld flash from being contacted with the fuel column or the air cavity spring.
Wherein the height of the second circular table section 42 is greater than the minimum requirement for the weld fusion line length. The difference in outer diameter between the second circular table section 42 and the first circular table section 41 is greater than 1mm. The outside diameter of the fourth round bench section 5 is not more than 1mm different from the inside diameter of the cladding tube matched with the end plug, and a groove is formed between the fourth round bench section and the welding zone 4.
Example 2:
As shown in fig. 2, the present embodiment is different from embodiment 1 only in that the third round land 43 of the stepped round land in the region of the resistance welding region 4 is not rounded near the tip end side of the end plug, but the conical inclined surface is formed by directly chamfering the grip section 3 to the third round land 43, which plays a role in guiding and preventing hooking.
Example 3:
As shown in fig. 3, the difference between the embodiment and the embodiment 1 is that the first circular table section 41 and the second circular table section 42 in the stepped circular table in the area of the resistance welding area 4 are in inclined transition connection, so that a certain inclination angle of the welded weld joint line after welding is realized, the length of the weld joint line is increased, the strength of the weld joint is enhanced, and meanwhile, the flow of weld flash in the welding process can be guided. The end plug is made of a different type of zirconium alloy material than the cladding tube.
Example 4
As shown in fig. 4, this embodiment also provides a fuel rod, which comprises a cladding tube, end plugs are welded at the port positions of the cladding tube in a resistance welding manner, a fourth round bench section 5 at the inner end of the end plugs is supported at the ends of fuel columns or air cavity springs inside the cladding tube, the end plugs for nuclear fuel rod resistance welding in the embodiment 1-3 are adopted, and the fuel pellets and the air cavity springs are packaged in the space formed by the end plugs and the cladding by implementing pressure resistance welding, so that the rod-shaped fuel element can be finally formed.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. An end plug for resistance welding of nuclear fuel rods, comprising an end plug body;
the middle part of the end plug body is provided with a welding area (4) for realizing resistance welding with a cladding tube, the welding area (4) is provided with a first circular table section (41), a second circular table section (42) and a third circular table section (43) which are coaxially connected in sequence in the direction far away from the cladding tube, and the outer diameter dimension of the second circular table section (42) is positioned between the inner diameter and the outer diameter dimension of the cladding tube;
The first circular table section (41), the second circular table section (42) and the third circular table section (43) are arranged, the outer diameter of the first circular table section (41) is minimum, and the outer diameter of the second circular table section (42) is maximum;
The inner end plug body is positioned in the cladding tube, the inner end of the end plug body is further provided with a fourth circular table section (5) which is coaxially connected with the first circular table section (41), the outer diameter of the fourth circular table section (5) is smaller than the inner diameter of the cladding tube, and the end plug body is positioned between the outer diameter sizes of the first circular table section (41) and the second circular table section (42);
A second conical table section is coaxially connected between the first circular table section (41) and the second circular table section (42), and the large diameter end of the second conical table section is connected with the end part of the second circular table section (42) and has the same outer diameter;
The height of the second circular table section (42) is larger than the minimum requirement of the length of a welding line fusion area, and the difference of the outer diameter of the second circular table section (42) and the outer diameter of the first circular table section (41) is larger than 1mm.
2. End plug for resistance welding of nuclear fuel rods according to claim 1, characterized in that the part of the end plug body outside the cladding tube is provided with a gripping area (2), which gripping area (2) is provided with an annular groove (21) for receiving a gripper.
3. End plug for resistance welding of nuclear fuel rods according to claim 2, characterized in that the annular groove (21) is coaxially connected with a gripping head gripping guide section (22) towards one end of the welding zone (4), the other end of the annular groove (21) is coaxially connected with a gripping head gripping contact section (23), the outer diameters of the gripping head gripping guide section (22) and the gripping head gripping contact section (23) both gradually increase towards a direction away from the annular groove (21).
4. End plug for resistance welding of nuclear fuel rods according to claim 3, characterized in that the gripping head gripping guide section (22) and the third circular table section (43) are also coaxially connected with a gripping area comprising a gripping section (3) for gripping by an electrode holder.
5. End plug for resistance welding of nuclear fuel rods according to claim 4, characterized in that the clamping section (3) is of a truncated cone shape, the outer diameter of the clamping section (3) is smaller than the outer diameter of the third rounded bench section (43), the end of the third rounded bench section (43) facing the clamping section (3) being rounded.
6. End plug for resistance welding of nuclear fuel rods according to claim 4, characterized in that the clamping section (3) is of truncated cone shape, the large diameter end of the clamping section (3) is connected to the third rounded segment (43), the small diameter end of the clamping section (3) is connected to the gripping guide section (22);
The outer diameter of the large-diameter end of the clamping section (3) is the same as that of the third circular table section (43), and the outer diameter of the small-diameter end of the clamping section (3) is the same as that of the large-diameter end of the grabbing head grabbing guide section (22).
7. End plug for resistance welding of nuclear fuel rods according to claim 3, characterized in that the outer end of the end plug body is further provided with a guiding zone (1), the guiding zone (1) comprises a first conical bench section (12), the large diameter end of the first conical bench section (12) is connected with the grabbing head grabbing contact section (23) through a transition round bench, and the small diameter end of the first conical bench section (12) is provided with a spherical segment (11).
8. End plug for resistance welding of nuclear fuel rods according to claim 7, characterized in that a transition cone segment (13) is further coaxially connected between the segment (11) and the small diameter end of the first cone segment (12), the large diameter end of the transition cone segment (13) is connected with the small diameter end of the first cone segment (12) and has the same outer diameter, and the small diameter end of the transition cone segment (13) and the end face of the segment (11) have the same outer diameter.
9. The fuel rod is characterized by comprising a cladding tube, wherein end plugs are welded at port positions of the cladding tube in a resistance mode, a fourth round bench section (5) at the inner end of each end plug is supported at the end part of a fuel column or an air cavity spring inside the cladding tube, and each end plug is an end plug according to any one of claims 1-8.
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| CN202311567281.4A CN117428307B (en) | 2023-11-22 | 2023-11-22 | End plug for resistance welding of nuclear fuel rod and fuel rod |
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| CN117428307B true CN117428307B (en) | 2025-02-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2393560C2 (en) * | 2008-08-07 | 2010-06-27 | Открытое акционерное общество "Новосибирский завод химконцентратов" | Fuel plug of nuclear reactor |
| CN106735807A (en) * | 2016-12-28 | 2017-05-31 | 中核北方核燃料元件有限公司 | A kind of new zirconium alloy fuel rod upset is molded soldering method |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0251097A (en) * | 1988-08-12 | 1990-02-21 | Hitachi Ltd | Fuel rod gripping mechanism |
| US9922731B2 (en) * | 2012-04-17 | 2018-03-20 | Bwxt Mpower, Inc. | Resistance welding of an end cap for nuclear fuel rods |
| CN110723517A (en) * | 2019-09-30 | 2020-01-24 | 成都术有云视觉科技有限公司 | Appearance surface defect and size detection device of nuclear fuel rod |
| CN110899942B (en) * | 2019-12-26 | 2025-08-05 | 西华大学 | A nuclear fuel rod end plug pressure resistance welding pressurizing device and welding method |
| CN113843492B (en) * | 2021-11-11 | 2023-05-09 | 重庆市光学机械研究所 | A fuel element plug body welding method |
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- 2023-11-22 CN CN202311567281.4A patent/CN117428307B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2393560C2 (en) * | 2008-08-07 | 2010-06-27 | Открытое акционерное общество "Новосибирский завод химконцентратов" | Fuel plug of nuclear reactor |
| CN106735807A (en) * | 2016-12-28 | 2017-05-31 | 中核北方核燃料元件有限公司 | A kind of new zirconium alloy fuel rod upset is molded soldering method |
| 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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| CN117428307A (en) | 2024-01-23 |
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