CN113744908B - Helium filling device, system and method for fuel rod plug - Google Patents
Helium filling device, system and method for fuel rod plug Download PDFInfo
- Publication number
- CN113744908B CN113744908B CN202110777781.5A CN202110777781A CN113744908B CN 113744908 B CN113744908 B CN 113744908B CN 202110777781 A CN202110777781 A CN 202110777781A CN 113744908 B CN113744908 B CN 113744908B
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- fuel rod
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- helium
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- 239000000446 fuel Substances 0.000 title claims abstract description 123
- 239000001307 helium Substances 0.000 title claims abstract description 79
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 79
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 174
- 230000007246 mechanism Effects 0.000 claims abstract description 64
- 238000005253 cladding Methods 0.000 claims description 17
- 238000005086 pumping Methods 0.000 claims description 7
- 239000008188 pellet Substances 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000007665 sagging Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 4
- 241000446313 Lamella Species 0.000 description 7
- 230000007704 transition Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
- G21C21/02—Manufacture of fuel elements or breeder elements contained in non-active casings
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a helium filling device, a helium filling system and a helium filling method for fuel rod pressing, wherein the helium filling device comprises: sealing the cavity and the corking mechanism; the sealing cavity is provided with a first opening and a second opening which are communicated with the sealing cavity, one end of the fuel rod to be inflated can extend into the sealing cavity through the first opening, the corking mechanism is arranged on one side of the sealing cavity corresponding to the second opening and used for clamping the end plug and can slide along the axial direction of the fuel rod, so that one end of the end plug clamped by the corking mechanism extends into the sealing cavity through the second opening until the end plug is pressed into the fuel rod; the sealing cavity is provided with a first sealing structure and a second sealing structure which are respectively used for sealing the first opening and the second opening, and is provided with an air inlet and outlet nozzle communicated with the sealing cavity and used for being connected with the vacuumizing device so as to discharge air in the sealing cavity or connected with the helium device so as to charge helium into the sealing cavity. The device has simple structure and controllable process, and can complete helium filling and plugging operations of MOX fuel rods with various specifications.
Description
Technical Field
The invention particularly relates to a helium filling device, a helium filling system and a helium filling method for a fuel rod.
Background
The main components of the nuclear fuel element used in the fast neutron reactor are fuel rods, and the fuel rods consist of cladding tubes, pellets, upper end plugs, lower end plugs and the like.
After the pellet tube loading operation is completed, helium needs to be filled into the fuel rod to avoid pellet oxidation, and then the end plug is pressed into the cladding tube to seal the fuel rod, so that the pressure and the volume ratio of the helium in the cladding tube are required.
At present, the existing domestic pressurized water fuel rod is sealed by adopting a helium filling mode after the end plug is pressed, helium is filled into a cladding tube through a central hole of the end plug, and the end plug plugging mechanism suitable for the pressurized water fuel rod is not suitable for the MOX fuel rod because the MOX fuel rod end plug is provided with a groove and needs to be filled with helium first and then plugged. Moreover, the helium filling modes and requirements of the two are different, and a helium filling device suitable for the MOX fuel rod needs to be developed.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a device suitable for pressurizing and helium filling of a MOX fuel rod, and correspondingly provide a system with the device and a method for pressurizing and helium filling of the fuel rod by using the system.
The technical scheme adopted for solving the technical problems of the invention is as follows:
the invention provides a helium filling device for fuel rod compression, comprising: sealing the cavity and the corking mechanism;
The sealing cavity is provided with a sealing cavity, a first opening and a second opening which are communicated with the sealing cavity are arranged on the sealing cavity, the first opening and the second opening are respectively arranged at two ends of the sealing cavity along the axial direction of the fuel rod,
The end of the fuel rod to be inflated can extend into the sealed chamber through the first opening,
The plugging mechanism is arranged on one side of the sealing cavity corresponding to the second opening and used for clamping the end plug and can slide along the axial direction of the fuel rod so that one end of the end plug clamped by the plugging mechanism stretches into the sealing cavity through the second opening and is pressed into the fuel rod by the end plug;
A first sealing structure and a second sealing structure are arranged on the sealing cavity, the first sealing structure is used for sealing the first opening after one end of the fuel rod to be inflated stretches into the sealing cavity,
The second sealing structure is used for sealing the second opening after one end clamped by the corking mechanism stretches into the sealing cavity,
And the sealing cavity is provided with an air inlet and exhaust nozzle communicated with the sealing cavity and used for being connected with a vacuumizing device so as to exhaust air in the sealing cavity or connected with a helium device so as to charge helium into the sealing cavity.
Optionally, the device further comprises a clamping mechanism, wherein the clamping mechanism is arranged on one side of the sealing cavity corresponding to the first opening and used for guiding the fuel rod to enter the sealing cavity and clamping one end of the fuel rod, which is provided with the core block, after the fuel rod enters the sealing cavity.
Optionally, the clamping mechanism includes clamping body and first cylinder, the clamping body includes first clamping lamella and second clamping lamella, and first cylinder links to each other with the second clamping lamella for drive second clamping lamella is close to first clamping lamella, so that form the centre gripping chamber of holding fuel rod between first clamping lamella and the second clamping lamella.
Optionally, the device further comprises a riding wheel mechanism, wherein the riding wheel mechanism is arranged between the clamping mechanism and the sealing cavity and is used for supporting one end of the fuel rod to be inflated so as to prevent the fuel rod from sagging before entering the sealing cavity.
Optionally, the first sealing structure is an inflatable sealing ring, the inflatable sealing ring is arranged in the first opening and can be used for a fuel rod to pass through, and an air inlet used for being connected with an external compressed air source is formed in the inflatable sealing ring.
Optionally, the sealing device further comprises an end plate, wherein the end plate is detachably connected to one end of the sealing cavity corresponding to the first opening and used for pressing the inflatable sealing ring in the first opening.
Optionally, the plug mechanism includes second cylinder and plug rod, the one end of plug rod links to each other with the second cylinder, and the other end is used for installing the end plug, and the second cylinder is used for driving the plug rod and slides along fuel rod axial direction.
Optionally, the plugging mechanism further comprises a pressure sensor, wherein the pressure sensor is arranged between the second cylinder and the plugging rod and is used for monitoring the plugging force of the plugging rod.
The invention also provides a fuel rod plunger helium filling system, which comprises a vacuumizing device, a helium device and the fuel rod plunger helium filling device.
The invention also provides a method for filling helium into the fuel rod by using the device, which comprises the following steps:
S1: one end of the fuel rod to be inflated is sent into the sealing cavity through the first opening of the sealing cavity, the corking mechanism slides towards the sealing cavity, so that one end of the end plug clamped by the corking mechanism stretches into the sealing cavity through the second opening of the sealing cavity, the first opening is sealed by adopting a first sealing structure, and the second opening is sealed by adopting a second sealing structure;
s2: connecting an air inlet and outlet nozzle on the sealed cavity with a vacuum pumping device, and starting the vacuum pumping device to discharge air in the sealed cavity;
S3: connecting an air inlet and outlet nozzle on the sealed cavity with a helium device, and starting the helium device to fill helium into the sealed cavity and the fuel rod;
s4: the plugging mechanism slides toward the sealed cavity to press the end plug into the fuel rod.
According to the invention, a sealing cavity structure with two openings is designed, and a corking mechanism capable of moving along the axial direction of a fuel rod is designed, the fuel rod stretches into the sealing cavity through one opening, the corking mechanism stretches an end plug into the sealing cavity through the other opening, and after the two openings are sealed through the sealing structure, the operation of vacuumizing and helium filling of the sealing cavity can be performed firstly, so that helium filling operation of the fuel rod is completed; and finally, continuously pushing the end plug into the fuel rod through the plugging mechanism until the end plug is pressed into the fuel rod, thus completing the plugging operation of the fuel rod. The device has simple structure and controllable process, and can complete helium filling and plugging operations of fuel rods with various specifications.
Drawings
FIG. 1 is a schematic diagram of a fuel rod helium filling device according to embodiment 1 of the present invention;
FIG. 2 is a schematic perspective view of a sealed cavity;
Fig. 3 is a schematic cross-sectional structure of the seal cavity and the corking mechanism.
In the figure: 1. a bottom plate; 2. a second cylinder; 3. a pressure sensor; 4. a transition block; 5. a plunger rod; 6. sealing the chamber; 7. a clamping body; 8. a first cylinder; 9. a fuel rod; 10. a window; 11. an air inlet and an air outlet; 12. sealing the cavity; 13. an air inlet; 14. an end plate; 15. a riding wheel mechanism; 16. a position sensor; 17. a first sealing structure; 18. a second sealing structure; 19. an end plug; 20. and a guide rail.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that the orientation or positional relationship indicated by "upper" or the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience and simplicity of description, and is not meant to indicate or imply that the apparatus or element to be referred to must be provided with a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood by those skilled in the art in specific cases.
The invention provides a helium filling device for fuel rod compression, comprising: sealing the cavity and the corking mechanism;
The sealing cavity is provided with a sealing cavity, a first opening and a second opening which are communicated with the sealing cavity are arranged on the sealing cavity, the first opening and the second opening are respectively arranged at two ends of the sealing cavity along the axial direction of the fuel rod,
The end of the fuel rod to be inflated can extend into the sealed chamber through the first opening,
The plugging mechanism is arranged on one side of the sealing cavity corresponding to the second opening and used for clamping the end plug and can slide along the axial direction of the fuel rod so that one end of the end plug clamped by the plugging mechanism stretches into the sealing cavity through the second opening and is pressed into the fuel rod by the end plug;
A first sealing structure and a second sealing structure are arranged on the sealing cavity, the first sealing structure is used for sealing the first opening after one end of the fuel rod to be inflated stretches into the sealing cavity,
The second sealing structure is used for sealing the second opening after one end clamped by the corking mechanism stretches into the sealing cavity,
And the sealing cavity is provided with an air inlet and exhaust nozzle communicated with the sealing cavity and used for being connected with a vacuumizing device so as to exhaust air in the sealing cavity or connected with a helium device so as to charge helium into the sealing cavity.
The invention also provides a fuel rod plunger helium filling system, which comprises a vacuumizing device, a helium device and the fuel rod plunger helium filling device.
The invention also provides a method for filling helium into the fuel rod by using the device, which comprises the following steps:
S1: one end of the fuel rod to be inflated is sent into the sealing cavity through the first opening of the sealing cavity, the corking mechanism slides towards the sealing cavity, so that one end of the end plug clamped by the corking mechanism stretches into the sealing cavity through the second opening of the sealing cavity, the first opening is sealed by adopting a first sealing structure, and the second opening is sealed by adopting a second sealing structure;
s2: connecting an air inlet and outlet nozzle on the sealed cavity with a vacuum pumping device, and starting the vacuum pumping device to discharge air in the sealed cavity;
S3: connecting an air inlet and outlet nozzle on the sealed cavity with a helium device, and starting the helium device to fill helium into the sealed cavity and the fuel rod;
s4: the plugging mechanism slides toward the sealed cavity to press the end plug into the fuel rod.
Example 1:
As shown in fig. 1-3, the present embodiment provides a fuel rod helium filling device, including: a sealed cavity 12 and a corking mechanism;
The sealing cavity 12 is provided with a sealing cavity 6, a first opening and a second opening which are communicated with the sealing cavity 6 are arranged on the sealing cavity 12, the first opening and the second opening are respectively arranged at two ends of the sealing cavity 12 along the axial direction of the fuel rod 9,
The end of the fuel rod 9 to be inflated can extend through the first opening into the sealed chamber 6,
The plugging mechanism is arranged on one side of the sealing cavity 12 corresponding to the second opening and is used for clamping the end plug 19 and can slide along the axial direction of the fuel rod 9 so that one end of the end plug 19 clamped by the plugging mechanism stretches into the sealing cavity 6 through the second opening until the end plug 19 is pressed into the fuel rod 9;
the sealing cavity 12 is provided with a first sealing structure 17 and a second sealing structure 18, the first sealing structure 17 is used for sealing the first opening after the end to be inflated of the fuel rod 9 extends into the sealing cavity 6,
The second sealing structure 18 is used to seal the second opening after one end of the clamping 19 of the corking mechanism protrudes into the sealing chamber 6,
The sealed cavity 12 is provided with an air inlet and outlet nozzle 11 communicated with the sealed cavity 6 and used for being connected with a vacuumizing device to discharge air in the sealed cavity 6 or connected with a helium device to fill helium into the sealed cavity 6.
Therefore, by designing a sealing cavity structure with two openings and designing a corking mechanism capable of moving along the axial direction of the fuel rod, the fuel rod stretches into the sealing cavity through one opening, the corking mechanism stretches the end plug into the sealing cavity through the other opening, and after the two openings are sealed through the sealing structure, the helium filling operation of the fuel rod can be completed by carrying out the operation of vacuumizing and helium filling on the sealing cavity; and finally, continuously pushing the end plug into the fuel rod through the plugging mechanism until the end plug is pressed into the fuel rod, thus completing the plugging operation of the fuel rod. The device has simple structure and controllable process, and can complete helium filling and plugging operations of fuel rods with various specifications.
In this embodiment, the device further includes a clamping mechanism disposed on a side of the sealing cavity 12 corresponding to the first opening, for guiding the fuel rod 9 into the sealing cavity 6, and clamping an end of the fuel rod 9 with the pellet after the fuel rod 9 enters the sealing cavity 6.
In this embodiment, the clamping mechanism includes a clamping body 7 and a first air cylinder 8, the clamping body 7 includes a first clamping flap and a second clamping flap, and the first air cylinder 8 is connected with the second clamping flap and is used for driving the second clamping flap to be close to the first clamping flap, so that a clamping cavity for accommodating the fuel rod 9 is formed between the first clamping flap and the second clamping flap.
The clamping body 7 is driven by a cylinder, so that the clamping of the fuel rod cladding tube can be realized, and the position of the cladding tube is stable during the plug pressing.
In this embodiment, the device further comprises a riding wheel mechanism 15, wherein the riding wheel mechanism 15 is arranged between the clamping mechanism and the sealing cavity 12 and is used for supporting one end of the fuel rod 9 to be inflated so as to prevent the end from sagging before entering the sealing cavity 6.
Next, the riding wheel mechanism 15 is provided with a position sensor 16, the fuel rod 9 is provided with a position sensor sheet, and when the fuel rod 9 moves to correspond to the position sensor sheet 16, the position sensor 16 sends out a signal.
In this embodiment, the first sealing structure 17 is an inflatable sealing ring, and the inflatable sealing ring is disposed in the first opening and can be penetrated by the fuel rod 9, and is provided with an air inlet 13 for connecting to an external compressed air source.
In this embodiment, the sealing device further includes an end plate 14, where the end plate 14 is detachably connected to an end of the sealing cavity 12 corresponding to the first opening, and is used to compress the inflatable sealing ring in the first opening.
In this embodiment, the plugging mechanism comprises a second cylinder 2 and a plugging rod 5, one end of the plugging rod 5 is connected with the second cylinder 2, the other end is used for installing an end plug 19, and the second cylinder 2 is used for driving the plugging rod 5 to slide along the axial direction of the fuel rod 9.
Specifically, the second cylinder 2, the clamping body 7, the first cylinder 8 and the sealing cavity 12 are all arranged on a bottom plate 1, a guide rail 20 is arranged on the bottom plate 1, the guide rail 20 is arranged along the axial direction of the fuel rod 9, the plunger rod 5 is arranged on a transition block 4 in a penetrating manner, and the transition block 4 is arranged on the guide rail 20 in a sliding manner, so that the plunger rod 5 moves linearly along the guide rail 20.
In this embodiment, the plugging mechanism further includes a pressure sensor 3, where the pressure sensor 3 is disposed between the second cylinder 2 and the plugging rod 5, and is used for monitoring the plugging force of the plugging rod 5.
In addition, the upper end of the sealing cavity 12 is provided with a window 10, so that the plugging condition of the end plug 19 can be observed at any time.
Specifically:
As shown in fig. 1 and 2, the cladding tube of the fuel rod 9 is fed through the clamping body 7 to the supporting roller 15, and is further fed after being corrected by the supporting roller 15, and when the end of the cladding tube 9 reaches the position sensor 16, the position sensor 16 sends a signal, and a cladding tube feeding mechanism (not shown) receives the signal and continues to feed for a fixed distance starting from the position, and the end of the cladding tube of the fuel rod 9 to be filled with helium enters a designated position in the sealing cavity 12.
As shown in fig. 3, the seal chamber 12 is fitted with an inflatable seal ring (first seal structure 17) which is compressed by the end plate 14. The cladding tube of the fuel rod 9 passes through the air-inflated sealing ring and enters the sealing cavity 12, the air inlet 13 is connected with external compressed air, and the compressed air enters the air-inflated sealing ring from the air inlet 13, so that the cladding tube is clamped to play a sealing role.
As shown in fig. 3, the end plug 19 is placed on the plunger rod 5, the plunger rod 5 is driven by the second cylinder 2 to be fed into the sealing cavity 12, and the gap between the plunger rod 5 and the sealing cavity 12 is sealed by the second sealing structure 18 (sealing ring).
As shown in fig. 2, the vacuum pumping device performs a vacuum pumping operation on the inside of the sealed cavity 12 through the air inlet and outlet 11, simultaneously pumps vacuum in the cladding tube, then the vacuum system is closed, helium is fed into the sealed cavity 12 from the air inlet and outlet 11 by the helium charging system, and then the helium charging is stopped when the pressure reaches the requirement.
As shown in fig. 1, the action of the plugging rod 5 presses the end plug 19 into the cladding tube, after a certain dwell time, the plugging rod 5 is withdrawn, the pressure sensor 3 monitors the plugging force in real time during the plugging process, and the second cylinder 2 stops driving when the plugging force exceeds a limit value.
Example 2:
The embodiment provides a fuel rod plunger helium filling system, which comprises a vacuumizing device, a helium device and the fuel rod plunger helium filling device of embodiment 1.
Example 3:
This embodiment provides a method of fuel rod tamponade helium filling using the apparatus of embodiment 1, comprising:
s1: one end of the fuel rod 9 to be inflated is sent into the sealing cavity 6 through the first opening of the sealing cavity 12, the corking mechanism slides towards the sealing cavity 12 so that one end of the clamping end plug 19 stretches into the sealing cavity 6 through the second opening of the sealing cavity 12, the first opening is sealed by the first sealing structure 17, and the second opening is sealed by the second sealing structure 18;
s2: the air inlet and outlet nozzle 11 on the sealed cavity 12 is connected with a vacuumizing device, and the vacuumizing device is started to discharge air in the sealed cavity 6;
S3: connecting an air inlet and outlet nozzle 11 on the sealing cavity 12 with a helium device, and starting the helium device to fill helium into the sealing cavity 6 and the fuel rod 9;
s4: the plugging mechanism slides towards the sealed cavity 12 to press the end plug 19 into the fuel rod 9.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (9)
1. A fuel rod helium filling device, comprising: a sealing cavity (12) and a corking mechanism;
The sealing cavity (12) is provided with a sealing cavity (6), a first opening and a second opening which are communicated with the sealing cavity (6) are arranged on the sealing cavity (12), the first opening and the second opening are respectively arranged at two ends of the sealing cavity (12) along the axial direction of the fuel rod (9),
The end of the fuel rod (9) to be inflated can extend into the sealing chamber (6) through the first opening,
The plugging mechanism is arranged on one side of the sealing cavity (12) corresponding to the second opening and is used for clamping the end plug (19) and can slide along the axial direction of the fuel rod (9), so that one end of the end plug (19) clamped by the plugging mechanism stretches into the sealing cavity (6) through the second opening until the end plug (19) is pressed into the fuel rod (9);
A first sealing structure (17) and a second sealing structure (18) are arranged on the sealing cavity (12), the first sealing structure (17) is used for sealing the first opening after one end of the fuel rod (9) to be inflated stretches into the sealing cavity (6),
The second sealing structure (18) is used for sealing the second opening after one end clamped (19) by the corking mechanism stretches into the sealing chamber (6),
An air inlet and outlet nozzle (11) communicated with the sealed cavity (6) is arranged on the sealed cavity (12) and is used for being connected with a vacuumizing device so as to discharge air in the sealed cavity (6) or connected with a helium device so as to charge helium into the sealed cavity (6);
The device also comprises a riding wheel mechanism (15), wherein the riding wheel mechanism (15) is arranged between the clamping mechanism and the sealing cavity (12) and is used for supporting one end of the fuel rod (9) to be inflated so as to prevent the fuel rod from sagging before entering the sealing cavity (6);
The position sensor (16) is arranged on the riding wheel mechanism, the position sensing sheet is arranged on the fuel rod, the cladding tube of the fuel rod reaches the riding wheel, and is continuously fed after being corrected by the riding wheel, when the fuel rod moves to the position sensor and corresponds to the position sensing sheet, the position sensor (16) sends out a signal, and the cladding tube feeding mechanism receives the signal and continuously feeds for a certain fixed distance by taking the signal as a starting point, so that the end part of the cladding tube to be filled with helium enters the appointed position in the sealed cavity.
2. A fuel rod helium filling apparatus according to claim 1, further comprising a clamping mechanism provided on a side of the seal chamber (12) corresponding to the first opening for guiding the fuel rod (9) into the seal chamber (6) and clamping an end of the fuel rod (9) with the pellet after the fuel rod (9) enters the seal chamber (6).
3. The fuel rod stopper helium filling device according to claim 2, wherein the clamping mechanism comprises a clamping body (7) and a first cylinder (8), the clamping body (7) comprises a first clamping flap and a second clamping flap, and the first cylinder (8) is connected with the second clamping flap and is used for driving the second clamping flap to be close to the first clamping flap so that a clamping cavity for accommodating the fuel rod (9) is formed between the first clamping flap and the second clamping flap.
4. A fuel rod stopper helium filling device according to any one of claims 1 to 3, wherein the first sealing structure (17) is an inflatable sealing ring, the inflatable sealing ring being arranged in the first opening and being permeable to the fuel rod (9), and being provided with an air inlet (13) for connection to an external compressed air source.
5. A fuel rod helium filling apparatus according to claim 4, further comprising an end plate (14), wherein the end plate (14) is detachably connected to an end of the sealing cavity (12) corresponding to the first opening, and is used for compressing the gas-filled sealing ring in the first opening.
6. A fuel rod helium filling apparatus according to any one of claims 1-3, wherein the plugging mechanism comprises a second cylinder (2) and a plugging rod (5), one end of the plugging rod (5) is connected to the second cylinder (2), the other end is used for installing an end plug (19), and the second cylinder (2) is used for driving the plugging rod (5) to slide along the axial direction of the fuel rod (9).
7. A fuel rod stopper helium filling apparatus according to claim 6, wherein the stopper mechanism further comprises a pressure sensor (3), the pressure sensor (3) being provided between the second cylinder (2) and the stopper rod (5) for monitoring a stopper pressing force of the stopper rod (5).
8. A fuel rod tamponade helium filling system comprising a vacuum pumping arrangement, a helium arrangement, and a fuel rod tamponade helium filling arrangement as in any of claims 1-7.
9. A method of fuel rod tamponade helium filling using the apparatus of any of claims 1-7, comprising:
S1: one end of the fuel rod (9) to be inflated is sent into the sealing cavity (6) of the fuel rod through a first opening of the sealing cavity (12), the corking mechanism slides towards the sealing cavity (12) so that one end of the clamping end plug (19) stretches into the sealing cavity (6) of the sealing cavity through a second opening of the sealing cavity (12), the first opening is sealed by a first sealing structure (17), and the second opening is sealed by a second sealing structure (18);
s2: an air inlet and outlet nozzle (11) on the sealed cavity (12) is connected with a vacuumizing device, and the vacuumizing device is started to discharge air in the sealed cavity (6);
s3: connecting an air inlet and outlet nozzle (11) on the sealed cavity (12) with a helium device, and starting the helium device to charge helium into the sealed cavity (6) and the fuel rod (9);
s4: the plugging mechanism slides towards the sealed cavity (12) to press the end plug (19) into the fuel rod (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110777781.5A CN113744908B (en) | 2021-07-09 | 2021-07-09 | Helium filling device, system and method for fuel rod plug |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110777781.5A CN113744908B (en) | 2021-07-09 | 2021-07-09 | Helium filling device, system and method for fuel rod plug |
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| Publication Number | Publication Date |
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| CN113744908A CN113744908A (en) | 2021-12-03 |
| CN113744908B true CN113744908B (en) | 2024-05-17 |
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| CN202110777781.5A Active CN113744908B (en) | 2021-07-09 | 2021-07-09 | Helium filling device, system and method for fuel rod plug |
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| CN115862916B (en) * | 2022-12-07 | 2023-10-24 | 中国原子能科学研究院 | Method for extracting krypton-85 from fast reactor spent fuel rod |
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| CN109585049A (en) * | 2018-12-29 | 2019-04-05 | 中核北方核燃料元件有限公司 | A kind of cladding tubes, which vacuumize, fills helium tamponade device |
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| CN206672648U (en) * | 2016-12-30 | 2017-11-24 | 中核建中核燃料元件有限公司 | A kind of fuel assembly guide pipe tamponade device |
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