CN110634583B - Single spent fuel rod transfer container and use method thereof - Google Patents
Single spent fuel rod transfer container and use method thereof Download PDFInfo
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- CN110634583B CN110634583B CN201910909831.3A CN201910909831A CN110634583B CN 110634583 B CN110634583 B CN 110634583B CN 201910909831 A CN201910909831 A CN 201910909831A CN 110634583 B CN110634583 B CN 110634583B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F5/00—Transportable or portable shielded containers
- G21F5/005—Containers for solid radioactive wastes, e.g. for ultimate disposal
- G21F5/008—Containers for fuel elements
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F5/00—Transportable or portable shielded containers
- G21F5/06—Details of, or accessories to, the containers
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F5/00—Transportable or portable shielded containers
- G21F5/06—Details of, or accessories to, the containers
- G21F5/065—Containers provided with a rotatable drum
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Abstract
The invention discloses a single spent fuel rod transfer container and a use method thereof, wherein the single spent fuel rod transfer container comprises a transfer structure for accommodating spent fuel rods, the transfer structure comprises a container structure with openings at the upper end and the lower end, a rotating device for driving the container structure to rotate, and a hoisting structure positioned above the transfer structure, the hoisting structure comprises a movable shielding rod, the upper end of the movable shielding rod is provided with a connecting end which is connected and matched with a push-pull rod, and the lower end of the movable shielding rod is connected with a connecting piece which is connected and matched with the spent fuel rods; the rotating device can drive the container structure to rotate, so that the axes of the openings at the upper end and the lower end of the container structure are superposed with the axis of the movable shielding rod. Therefore, the structure utilizes the idea of coaxial arrangement, so that the spent fuel rod directly enters the container structure in the ascending motion process, the loading speed is high, and the radiation exposure time is prevented from being overlong.
Description
Technical Field
The invention relates to the field of reactor fuel rod control, in particular to a single spent fuel rod transfer container and a use method thereof.
Background
Most of the design concepts of the prior fuel rod transfer vessels are to integrally construct a vessel bottle, if a spent nuclear fuel rod canister of patent publication No. CN105359221B contains a submersible pressure vessel.
The core idea of this type of transfer vessel is that a fully enclosed shielding shell is provided, which is then open at one end and provided with a more specific sealing cap for shielding and transferring the nuclear fuel rods.
For the transportation container, the transportation method comprises the steps of taking out the fuel rods from the reactor core by using push-pull rods in a nuclear power plant factory building, moving the fuel rods upwards to a certain height, horizontally moving the fuel rods, inserting the fuel rods into the transportation container after the fuel rods reach the upper part of the container, and finally sealing the shielding cover of the transportation container on the transportation container.
This method has a problem that the fuel rod generates a pendulum after the fuel rod is translated, and the fuel rod needs to be inserted into the transfer container when the pendulum of the fuel rod stops or the swing is small, so that it takes time to wait.
Disclosure of Invention
The invention aims to provide a single spent fuel rod transfer container and a use method thereof, which overcome the complex working procedures during the transfer of fuel rods and can adapt to the transfer of spent fuel rods to a radioactive hot chamber.
The invention is realized by the following technical scheme:
the single spent fuel rod transfer container comprises a transfer structure for accommodating spent fuel rods,
the transfer structure comprises a container structure with an opening at the upper end and the lower end, and a rotating device for driving the container structure to rotate,
the hoisting structure is positioned above the transfer structure and comprises a movable shielding rod, the upper end of the movable shielding rod is provided with a connecting end which is connected and matched with the push-pull rod, and the lower end of the movable shielding rod is connected with a connecting piece which is connected and matched with the spent fuel rod;
the rotating device can drive the container structure to rotate, so that the axes of the openings at the upper end and the lower end of the container structure are superposed with the axis of the movable shielding rod.
As can be seen from the above structure, the spatial relationship of the above structure in the present invention is: when the container structure is used, the rotating device is used for rotating the container structure, so that the opening axes of the upper end and the lower end of the container structure are superposed with the axis of the movable shielding rod, at the moment, the movable shielding rod is driven to pull the spent fuel rod in the vertical direction only by utilizing the push-pull rod, the spent fuel rod is moved upwards into the container structure, then the rotating device is used for enabling the opening axes of the upper end and the lower end of the container structure to be perpendicular to the axis of the movable shielding rod, namely, the container structure is vertically arranged before the spent fuel rod is loaded, and the container structure is horizontally arranged after the spent fuel rod is loaded. The push-pull rod only moves up and down, and the spent fuel rod only moves up and rotates. The whole process avoids utilizing a push-pull rod to drive the spent fuel rod to move horizontally, the conception is that the spent fuel rod enters from the bottom of the container structure, and the whole container structure enables the spent fuel rod to be in a horizontal state in the transfer process. Therefore, the structure utilizes the idea of coaxial arrangement, so that the spent fuel rod directly enters the container structure in the ascending motion process, the loading speed is high, and the radiation exposure time is prevented from being overlong.
In order to realize the matching of the container structure and the rotating device and enable the container structure to complete rotating under the driving of the rotating device, the invention borrows the design idea of the valve core, the shielding valve core is connected with the rotating device, the rotating device can freely rotate in the shielding valve core shell under the driving of the rotating device, therefore, the container structure comprises the shielding valve core and a shielding valve core middle pipe which penetrates through the shielding valve core and is provided with an opening at the upper end and the lower end, the shielding valve core shell is sleeved outside the shielding valve core, the shielding valve core shell is provided with a bearing hole, a bearing is arranged in the bearing hole, a bearing seat of the bearing is embedded into the bearing hole, one end of a bearing rotating shaft of the bearing is connected with the shielding valve core, and the other end of the bearing rotating shaft of the bearing is connected with the rotating device. The action process is as follows: the rotating device rotates to drive the bearing rotating shaft of the bearing to rotate, and then the shielding valve core is driven to rotate through the bearing rotating shaft of the bearing.
Although the structure realizes that the spent fuel rod is arranged in the container structure, in order to avoid radiation, a radiation shielding structure is required to be arranged outside the container structure, wherein a shielding valve shell is sleeved outside the shielding valve core shell, a rotating device assembling hole is formed in the side wall of the shielding valve shell, and the rotating device penetrates through the rotating device assembling hole and then is connected with a bearing rotating shaft of the bearing. Generally, there is a gap between the shield valve housing and the shield valve cartridge housing, and the gap constitutes a closed space C filled with a radiation shielding material (lead-filled). Therefore, when the shielding valve core is horizontal, the openings at the upper end and the lower end of the middle pipe of the shielding valve core can be aligned to the thick closed space C, so that the shielding effect is achieved.
Preferably, in order to achieve integration of the overall structure. And a connecting cylinder is arranged between the shielding valve core shell and the shielding valve shell, and the rotating device penetrates through the rotating device assembling hole and then is inserted into the connecting cylinder to be connected with a bearing rotating shaft of the bearing.
Preferably, because the rotating device needs to be driven, in order to avoid radiation influence, the rotating device comprises a rotating shielding plug, the rotating shielding plug comprises a small-diameter part and a large-diameter part, the diameter of the large-diameter part is larger than that of the small-diameter part, the small-diameter part and the large-diameter part are coaxially connected, the small-diameter part penetrates through a rotating device assembly hole, the end face of the small-diameter part connected with the small-diameter part is flush with the outer wall of the housing of the shielding valve, and the rotating device further comprises a hand shaft arranged at the outer end of the large-diameter part. The small diameter portion and the large diameter portion substantially form a stepped structure, and radiation is reflected when encountering the shielding layer, so that a high shielding requirement can be satisfied by the stepped structure.
Meanwhile, preferably, the small diameter part and the large diameter part are hollow circular tube structures, and a closed space E is formed inside the small diameter part and the large diameter part, and the closed space E is filled with a radiation shielding material (filled with lead).
The container of the valve core rotating body is innovatively designed, so that spent fuel rods can conveniently enter and exit the transferring container, the rotating shielding plug is innovatively designed, so that the shielding valve can always keep good shielding performance in the transferring process, and the safety of operators in the operation process and the safety of transferring personnel in the transferring process are ensured.
Preferably, the shielding structure needs to be well constructed for the movable shielding rod, the shielding structure comprises an upper end enclosure and a lower end enclosure, a closed space A is constructed between the upper end enclosure and the lower end enclosure by using an outer shielding cylinder, and a radiation shielding material (filled with lead) is filled in the closed space A, so that the inner pipe is shielded, and meanwhile, a positioning device is arranged on the lower end enclosure and has the functions of positioning and shielding.
Therefore, the present invention preferably further comprises: an upper seal head and a lower seal head, a positioning device is arranged above the lower seal head,
the hoisting structure also comprises an inner tube sleeved outside the movable shielding rod, an outer shielding cylinder is sleeved outside the inner tube,
the upper end of the inner tube penetrates through the lower end enclosure, and the connecting end of the movable shielding rod penetrates out of the upper end of the inner tube and is fixed by a positioning device above the lower end enclosure;
the utility model discloses a transfer structure, including the transport structure, the transport structure overcoat is equipped with the shielded valve shell, the last blind end of shielded valve shell is connected with the downside of upper cover, the last blind end of shielded valve shell, the upper cover is opened has the through-hole with the coaxial centering of inner tube, the lower extreme of inner tube runs through the through-hole of upper cover, rotating device drive containment structure turns, make containment structure's upper end, when lower extreme opening axis coincides with the axis that moves the shielding stick, containment structure's upper end, lower extreme opening axis and the last blind end of shielded valve shell, the through-hole of upper cover is coaxial, rotating device penetrates in the shielded valve shell from the shielded valve shell lateral wall and is connected with the transport structure.
Preferably, in order to enable the spent fuel and the movable shielding rod to move continuously, a communication channel for guiding needs to be arranged in the housing of the shielding valve, the communication channel comprises a shielding valve core upper hollow pipe and a shielding valve core lower hollow pipe, the inner pipe, the upper end socket, the through hole, the shielding valve core upper hollow pipe, the shielding valve core middle pipe and the shielding valve core lower hollow pipe are coaxially arranged in a centered manner in the general structure, and the spent fuel and the movable shielding rod can move continuously in the coaxially aligned channel.
Therefore, the through hole of the upper closed end of the shielding valve shell extends inwards to form a shielding valve core upper hollow pipe, and the lower closed end of the shielding valve shell penetrates through the shielding valve core lower hollow pipe; the rotating device drives the container structure to rotate, so that when the axes of the openings at the upper end and the lower end of the container structure coincide with the axis of the movable shielding rod, the axes of the upper hollow pipe and the lower hollow pipe of the shielding valve core coincide with the axis of the movable shielding rod and the axes of the openings at the upper end and the lower end of the container structure.
Preferably, the use method of the single spent fuel rod transfer container comprises the following steps when transferring spent fuel:
s1, forward rotation of the rotating device: the rotating device is driven to enable the container structure to rotate, and when the openings at the upper end and the lower end of the container structure coincide with the axis of the movable shielding rod, the rotating device is stopped to be driven;
s2, driving the movable shielding rod downwards: connecting the push-pull rod with the movable shielding rod by using a push-pull rod in the plant, and driving the movable shielding rod and the connecting piece to penetrate through the lower end of the container structure after penetrating through the upper end of the container structure;
s3, connecting a spent fuel rod: after the connecting piece penetrates out of the lower end of the container structure, the connecting piece is connected with the spent fuel rod through the connecting piece;
s4, driving the movable shielding rod upwards: pushing and pulling the rod in the factory to drive the movable shielding rod and the connecting piece to move upwards;
s5, rotation of the rotating device: and when the openings at the upper end and the lower end of the container structure are vertical to the axis of the movable shielding rod, stopping driving the rotating device.
Before the connecting piece is disconnected with the spent fuel rod, the connecting end of the movable shielding rod needs to be fixed through a positioning device above the lower end socket.
The invention can achieve the following effects: the invention provides a safe and convenient container for transporting spent fuel rods, can shield rays of the spent fuel rods, avoids radiation injury to operators, greatly reduces radiation injury risks brought by operation, and has the advantages of simpler and more labor-saving operation, more compact structure, high safety coefficient, good stability and easy maintenance.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic side sectional view of the present invention.
Fig. 2 is a schematic top view of the present invention.
FIG. 3 is a side view of the present invention.
The reference numerals in the figures are denoted respectively by:
1. a movable shielding rod; 2. a sleeve; 3. an inner tube; 4. shielding the valve core middle pipe; 5. a shield spool; 6. a shield valve housing; 7. a bearing A; 8. rotating the shielding plug; 9. a hand shaft; 10. a stopper cover; 11. an outer shielding cylinder; 12. a large washer; 13. a lower end enclosure; 14. pressing a plate; 15. a bolt; 16. a nut; 17. a closed space A; 18. a closed space B; 19. a closed space C; 20. a closed space D; 21. an enclosed space E; 22. rotating the shielding plug cover cylinder; 23. an upper end enclosure; 24. an axial lifting lug; 221. a U groove; 61. a shielded valve core housing; 62. a connecting cylinder; 63. a bearing shaft; 64. and a bearing seat.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in FIG. 1: the single spent fuel rod transfer container comprises a transfer structure for accommodating spent fuel rods,
the transfer structure comprises a container structure with an opening at the upper end and the lower end, and a rotating device for driving the container structure to rotate,
the hoisting structure is positioned above the transfer structure and comprises a movable shielding rod 1, the upper end of the movable shielding rod 1 is provided with a connecting end which is connected and matched with the push-pull rod, and the lower end of the movable shielding rod is connected with a connecting piece which is connected and matched with the spent fuel rod;
wherein, the rotating device can drive the container structure to rotate, so that the axes of the openings at the upper end and the lower end of the container structure are superposed with the axis of the movable shielding rod 1.
As can be seen from the above structure, the spatial relationship of the above structure in the present invention is: when the transfer structure is used, the container structure is rotated by the rotating device, so that the opening axes of the upper end and the lower end of the container structure are superposed with the axis of the movable shielding rod 1, at the moment, the movable shielding rod 1 is driven by the push-pull rod to pull the spent fuel rod in the vertical direction, the spent fuel rod is moved upwards into the container structure, then the rotating device is used for enabling the opening axis of the upper end and the lower end of the container structure to be perpendicular to the axis of the movable shielding rod 1, namely, the container structure is vertically arranged before the spent fuel rod is loaded, and after the spent fuel rod is loaded, the container structure is horizontally arranged. The push-pull rod only moves up and down, and the spent fuel rod only moves up and rotates. The whole process avoids utilizing a push-pull rod to drive the spent fuel rod to move horizontally, the conception is that the spent fuel rod enters from the bottom of the container structure, and the whole container structure enables the spent fuel rod to be in a horizontal state in the transfer process. Therefore, the structure utilizes the idea of coaxial arrangement, so that the spent fuel rod directly enters the container structure in the ascending motion process, the loading speed is high, and the radiation exposure time is prevented from being overlong.
Example 2
As shown in FIG. 1:
on the basis of embodiment 1, specifically, in order to realize that a container structure is matched with a rotating device, and the container structure can complete rotating under the driving of the rotating device, the invention borrows the design concept of a valve core, connects a shielding valve core 5 with the rotating device, and can freely rotate in a shielding valve core shell 61 under the driving of the rotating device, so that the container structure comprises the shielding valve core 5 and a shielding valve core middle tube 4 which penetrates through the shielding valve core and is provided with openings at the upper end and the lower end, the shielding valve core shell 61 is sleeved outside the shielding valve core 5, the shielding valve core shell 61 is provided with a bearing hole, a bearing (a 7 is arranged at a symmetrical position of the bearing) is arranged in the bearing hole, a bearing seat 64 of the bearing is embedded into the bearing hole, one end of a bearing rotating shaft 63 of the bearing is connected with the shielding valve core 5, and the other end of the bearing rotating shaft is connected with the rotating device. The action process is as follows: the rotating device rotates to drive the bearing rotating shaft 63 of the bearing to rotate, and then the bearing rotating shaft 63 of the bearing drives the shielding valve core 5 to rotate.
Although the above structure realizes that the spent fuel rod is arranged in the container structure, in order to avoid radiation, a radiation shielding structure needs to be arranged outside the above structure, wherein the shielding valve core shell 61 is sleeved with the shielding valve shell 6, the side wall of the shielding valve shell 6 is provided with a rotating device assembling hole, and the rotating device penetrates through the rotating device assembling hole and then is connected with the bearing rotating shaft 63 of the bearing. Generally, there is a gap between the shield valve housing 6 and the shield valve core housing 61, and the gap constitutes a closed space C19, and the closed space C is filled with a radiation shielding material (lead-filled). Therefore, when the shielding valve core 5 is horizontal, the openings at the upper end and the lower end of the middle pipe 4 of the shielding valve core can be aligned with the thick closed space C, so that the shielding effect is achieved.
Preferably, in order to achieve integration of the overall structure. A connecting cylinder 62 is arranged between the shielding valve core shell 61 and the shielding valve shell 6, and the rotating device penetrates through the rotating device assembling hole and then is inserted into the connecting cylinder 62 to be connected with a bearing rotating shaft 63 of the bearing.
Preferably, because the rotating device needs to be driven, in order to avoid the influence of radiation, the rotating device comprises a rotating shielding plug 8, the rotating shielding plug 8 comprises a small-diameter part and a large-diameter part, the diameter of the large-diameter part is larger than that of the small-diameter part, the small-diameter part and the large-diameter part are coaxially connected, the small-diameter part penetrates through a mounting hole of the rotating device, the end face of the small-diameter part connected with the small-diameter part is flush with the outer wall of the shielding valve shell 6, and the hand shaft 9 is arranged at the outer end of the large-diameter part. The small diameter portion and the large diameter portion substantially form a stepped structure, and radiation is reflected when encountering the shielding layer, so that a high shielding requirement can be satisfied by the stepped structure.
Meanwhile, preferably, the small diameter part and the large diameter part are hollow circular tube structures, and a closed space E21 is formed inside the small diameter part and the large diameter part, and the closed space E21 is filled with a radiation shielding material (filled with lead).
The container of the valve core rotating body is innovatively designed, so that spent fuel rods can conveniently enter and exit the transferring container, the rotating shielding plug is innovatively designed, so that the shielding valve can always keep good shielding performance in the transferring process, and the safety of operators in the operation process and the safety of transferring personnel in the transferring process are ensured.
Example 3
As shown in FIG. 1:
on the basis of embodiment 1 or embodiment 2, specifically, preferably, because a good shielding structure needs to be constructed for the movable shielding rod 1, the shielding structure includes an upper end enclosure 23 and a lower end enclosure 13, a closed space a17 is constructed between the upper end enclosure 23 and the lower end enclosure 13 by using the outer shielding cylinder 11, and a radiation shielding material (lead-filled) is filled in the closed space a, so as to achieve shielding of the inner tube 3, and meanwhile, a positioning device is arranged on the lower end enclosure 13, and the positioning device has positioning and shielding functions.
Therefore, the present invention preferably further comprises: an upper seal head 23 and a lower seal head 13, a positioning device is arranged above the lower seal head 13,
the hoisting structure also comprises an inner tube 3 sleeved outside the movable shielding rod 1, an outer shielding cylinder 11 is sleeved outside the inner tube 3,
the two ends of the outer shielding cylinder 11 are respectively connected with the upper end enclosure 23 and the lower end enclosure 13, the upper end of the inner pipe 3 penetrates through the lower end enclosure 13, and the connecting end of the movable shielding rod 1 penetrates out of the upper end of the inner pipe 3 and then is fixed by a positioning device above the lower end enclosure 13;
the transport structure overcoat is equipped with shielded valve shell 6, the last blind end of shielded valve shell 6 is connected with the downside of upper cover 23, the last blind end of shielded valve shell 6, upper cover 23 opens the through-hole that has with the coaxial centering of inner tube, the lower extreme of inner tube 3 runs through the through-hole of upper cover 23, rotating device drive containment structure turns, make containment structure's upper end, when lower extreme opening axis coincided with the axis that moves shielding stick 1, containment structure's upper end, lower extreme opening axis and shielded valve shell 6's last blind end, the through-hole of upper cover 23 is coaxial, rotating device penetrates shielded valve shell 6 in from shielded valve shell 6 lateral wall and is connected with the transport structure.
Preferably, in order to enable the spent fuel and the movable shielding rod to move continuously, a communication channel for guiding needs to be arranged in the shielding valve shell 6, the communication channel comprises a shielding valve core upper hollow pipe and a shielding valve core lower hollow pipe, the inner pipe, the upper sealing head 23, the through hole, the shielding valve core upper hollow pipe, the shielding valve core middle pipe 4 and the shielding valve core lower hollow pipe are coaxially arranged in a centered mode in the general structure, and the spent fuel and the movable shielding rod can move continuously in the coaxial centered channel.
Therefore, the through hole of the upper closed end of the shield valve shell 6 of the invention extends inwards to form a shield valve core upper hollow pipe, and the lower closed end of the shield valve shell 6 penetrates through the shield valve core lower hollow pipe; when the rotating device drives the container structure to rotate so that the axes of the openings at the upper end and the lower end of the container structure coincide with the axis of the movable shielding rod 1, the axes of the upper hollow pipe and the lower hollow pipe of the shielding valve core coincide with the axis of the movable shielding rod 1 and the axes of the openings at the upper end and the lower end of the container structure.
Example 4
As shown in fig. 1, the use method of the single spent fuel rod transfer container comprises the following steps:
s1, forward rotation of the rotating device: the rotating device is driven to enable the container structure to rotate, and when the openings at the upper end and the lower end of the container structure coincide with the axis of the movable shielding rod 1, the rotating device is stopped being driven;
s2, driving the movable shielding rod downwards: connecting the push-pull rod with the movable shielding rod 1 by using a push-pull rod in the plant, and driving the movable shielding rod (1) and the connecting piece to penetrate out of the lower end of the container structure after penetrating through the upper end of the container structure;
s3, connecting a spent fuel rod: after the connecting piece penetrates out of the lower end of the container structure, the connecting piece is connected with the spent fuel rod through the connecting piece;
s4, driving the movable shielding rod upwards: the pull rod is pushed in the factory building to drive the movable shielding rod 1 and the connecting piece to move upwards;
s5, rotation of the rotating device: and when the spent fuel rod completely enters the container structure, the connecting piece is disconnected from the spent fuel rod, then the rotating device is driven to enable the container structure to rotate, and when the openings at the upper end and the lower end of the container structure are vertical to the axis of the movable shielding rod 1, the rotating device is stopped being driven.
Before the connection between the connecting piece and the spent fuel rod is disconnected, the connecting end of the movable shielding rod 1 needs to be fixed through a positioning device above the lower end socket 13.
Example 5
As shown in fig. 1, 2 and 3, on the basis of the above embodiments, the present embodiment will explain the following structural configurations and methods of use from the perspective of the overall structure in the drawings:
as can be seen from the figure, the transfer container mainly comprises a movable shielding rod 1, a sleeve 2, an inner pipe 3, a shielding valve core middle pipe 4, a shielding valve core 5, a shielding valve shell 6, a bearing A7, a rotary shielding plug 8, a hand shaft 9, a stop cover 10, an outer shielding cylinder 11, a large gasket 12, a lower seal head 13, a pressure plate 14, a bolt 15, a nut 16, a closed space A17, a closed space B18, a closed space C19, a closed space D20, a closed space E21, a rotary shielding plug cover cylinder 22, an upper seal head 23, an axial lifting lug 24, a U-shaped groove 221, a shielding valve core shell 61, a connecting cylinder 62, a bearing rotating shaft 63 and a bearing seat 64.
Wherein, move shielding rod 1, sleeve pipe 2 (connecting piece) and be located the inner tube, move the biggest clearance between shielding rod and the inner tube and need be less than half of sleeve pipe wall thickness, and be not less than 0.5mm to guarantee that shielding effect and move shielding rod and interior intraductal removal smoothly. The conical end (lower end) of the movable shielding rod is welded with one end of the sleeve pipe opening, the conical end face of the movable shielding rod is in contact with the end face of the spent fuel rod, and the outer ring face of the other end and the large gasket are pressed on the concave face of the lower end socket through the bolt and the nut by the pressing plate.
The lower end enclosure, the cylinder and the upper end enclosure, and the rotary shielding plug cover cylinder and the shielding valve are connected by welding. Lead is filled in a closed space A formed by an inner tube, a cylinder, an upper seal head and a lower seal head of the transfer container, an inner closed space B of the upper seal head, a closed space C in the shielding valve and a closed space D in the rotary shielding plug so as to shield rays of spent fuel rods.
The shielding valve is divided into an upper part and a lower part which are connected and assembled with the upper end enclosure through bolts and nuts, the shielding valve and the shielding valve core are designed into a stepped structure in the axial direction and the radial direction, and the shielding valve core can flexibly rotate in the shielding valve. The upper portion of shield valve is opened there is the round hole, and the rotation shield stopper is arranged in wherein, and the quad slit of rotation shield stopper bottom cooperatees with the square stick of shielding case upper end, has forbidden the mutual rotation between the two, and the top of rotation shield stopper contacts or only has the clearance that is less than 1mm with the locking lid internal surface. One end of the hand shaft is provided with a hole, the other end of the hand shaft is fixed between two bosses at the upper part of the rotary shielding plug through a bolt and a nut, penetrates through a U-shaped groove 221 on the cover cylinder of the rotary shielding plug at the other end of the top of the rotary shielding plug, and is limited between the U-shaped groove 221 of the stop cover and the U-shaped groove 221 of the cover cylinder of the rotary shielding plug through the bolt and the nut by the stop cover. When the U-shaped gap of the stop cover is aligned with the U-shaped gap of the rotary shielding plug cover cylinder, the rotary hand shaft is tightly surrounded, and four rotation hand shafts are uniformly distributed along the outer edge of the stop cover.
In view of the above structure, before entering the transfer container, the spent fuel rod sequentially performs the following steps: 1. firstly, screwing off four bolts and nuts on the outer edge of the stop cover, taking off the stop cover, slightly lifting up the hand shaft, rotating the hand shaft by 90 degrees from an original position, clamping the hand shaft at a position corresponding to the U groove 221 on the upper edge of the rotary shielding plug cover cylinder, enabling the middle pipe of the shielding valve core to be axially aligned with the inner pipe, opening the shielding valve, and then fixing the stop cover in the original position through the bolts and the nuts; 2. screwing off a bolt 15 and a nut 16 at the bottom of the pressing plate 14, taking off the pressing plate and a large washer (the pressing plate, the large washer and the bolt and the nut form a positioning device), connecting the nut of the push-pull rod with the thread at the outer end of the movable shielding rod, and moving the movable shielding rod and the sleeve towards the direction of the shielding valve by pushing the push-pull rod until the sleeve is exposed out of the shielding valve (the push-pull rod is a long pipe with one end welded with a nut matched with the thread at the outer end of the movable shielding rod); 3. the spent fuel rod is inserted into the sleeve through a manipulator and the like, one end of the spent fuel rod is attached to the inner end of the movable shielding rod, the push-pull rod is slowly pulled, the movable shielding rod drives the sleeve and the spent fuel rod to be pulled back to an initial position, then the large gasket, the pressing plate and the movable shielding rod are respectively installed to an original position through the bolt and the nut, and at the moment, the spent fuel rod enters the transfer container. After the spent fuel rod enters the transfer container, the step 1 is repeatedly executed, so that the middle tube of the shielding valve core is axially vertical to the inner tube, the shielding valve is closed, and the transfer container can be transported to the radioactive hot chamber. And (3) sequentially executing the step (1) and the step (2) when the spent fuel rod is moved out of the transfer container. And (3) after the spent fuel rod is taken out by the manipulator in the radioactive hot chamber and is inspected, the transfer container can be transported to the destination.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The single spent fuel rod transfer container comprises a transfer structure for accommodating spent fuel rods and is characterized in that,
the transfer structure comprises a container structure with an opening at the upper end and the lower end, and a rotating device for driving the container structure to rotate,
the hoisting structure is positioned above the transfer structure and comprises a movable shielding rod (1), the upper end of the movable shielding rod (1) is provided with a connecting end which is connected and matched with the push-pull rod, and the lower end of the movable shielding rod is connected with a connecting piece which is connected and matched with the spent fuel rod;
the rotating device can drive the container structure to rotate, so that the axes of the openings at the upper end and the lower end of the container structure are superposed with the axis of the movable shielding rod (1);
the rotating device comprises a rotating shielding plug (8), the rotating shielding plug (8) comprises a small-diameter part and a large-diameter part, the diameter of the large-diameter part is larger than that of the small-diameter part, the small-diameter part and the large-diameter part are coaxially connected, the small-diameter part penetrates through a rotating device assembling hole, the end face of the small-diameter part, which is connected with the small-diameter part, is flush with the outer wall of a shielding valve shell (6) of the container structure, and the rotating device further comprises a hand shaft (9) arranged at the outer end of the large-diameter part;
the hoisting structure also comprises an inner tube (3) sleeved outside the movable shielding rod (1), an outer shielding cylinder (11) is sleeved outside the inner tube (3),
the two ends of the outer shielding cylinder (11) are respectively connected with the upper end enclosure (23) and the lower end enclosure (13), the upper end of the inner pipe (3) penetrates through the lower end enclosure (13), and the connecting end of the movable shielding rod (1) penetrates out of the upper end of the inner pipe (3) and is fixed by a positioning device above the lower end enclosure (13);
also comprises an upper seal head (23) and a lower seal head (13), a positioning device is arranged above the lower seal head (13),
the transport structure overcoat is equipped with shielded valve shell (6), the last blind end of shielded valve shell (6) is connected with the downside of upper cover (23), the last blind end of shielded valve shell (6), upper cover (23) are opened there is the through-hole with the coaxial centering of inner tube, the lower extreme of inner tube (3) runs through the through-hole of upper cover (23), rotating device drive containment structure turns, make containment structure's upper end, when lower extreme opening axis coincides with the axis that moves shielding stick (1), containment structure's upper end, the last blind end of lower extreme opening axis and shielded valve shell (6), the through-hole of upper cover (23) is coaxial, rotating device penetrates shielded valve shell (6) in from shielded valve shell (6) lateral wall and is connected with transport structure.
2. The single spent fuel rod transfer vessel of claim 1,
the container structure comprises a shielding valve core (5) and a shielding valve core middle pipe (4) penetrating through the shielding valve core and having openings at the upper end and the lower end, wherein a shielding valve core shell (61) is sleeved outside the shielding valve core (5), a bearing hole is formed in the shielding valve core shell (61), a bearing is arranged in the bearing hole, a bearing seat (64) of the bearing is embedded into the bearing hole, one end of a bearing rotating shaft (63) of the bearing is connected with the shielding valve core (5), and the other end of the bearing rotating shaft is connected with a rotating device.
3. The single spent fuel rod transfer vessel of claim 2,
the shielding valve core shell (61) is sleeved with a shielding valve shell (6), the side wall of the shielding valve shell (6) is provided with a rotating device assembling hole, and the rotating device penetrates through the rotating device assembling hole and then is connected with a bearing rotating shaft (63) of the bearing.
4. The single spent fuel rod transfer vessel of claim 3,
a connecting cylinder (62) is arranged between the shielding valve core shell (61) and the shielding valve shell (6), and the rotating device penetrates through a rotating device assembling hole and then is inserted into the connecting cylinder (62) to be connected with a bearing rotating shaft (63) of the bearing.
5. The single spent fuel rod transfer vessel of claim 4, wherein,
the small-diameter part and the large-diameter part are of hollow circular tube structures, a closed space E (21) is formed inside the small-diameter part and the large-diameter part, and radiation shielding materials are filled in the closed space E (21).
6. The single spent fuel rod transfer vessel of claim 1,
the through hole of the upper closed end of the shielding valve shell (6) extends inwards to form a shielding valve core upper hollow pipe, and the lower closed end of the shielding valve shell (6) penetrates through the shielding valve core lower hollow pipe; when the rotating device drives the container structure to rotate so that the axes of the openings at the upper end and the lower end of the container structure coincide with the axis of the movable shielding rod (1), the axes of the upper hollow pipe and the lower hollow pipe of the shielding valve core coincide with the axis of the movable shielding rod (1) and the axes of the openings at the upper end and the lower end of the container structure.
7. The use method of the single spent fuel rod transfer container is characterized in that based on the single spent fuel rod transfer container in any one of claims 1-6, when transferring spent fuel, the use method comprises the following steps:
s1, forward rotation of the rotating device: the rotating device is driven to enable the container structure to rotate, and when the openings at the upper end and the lower end of the container structure coincide with the axis of the movable shielding rod (1), the rotating device is stopped being driven;
s2, driving the movable shielding rod downwards: connecting a push-pull rod with a movable shielding rod (1) by using a push-pull rod in a plant, and driving the movable shielding rod (1) and a connecting piece to penetrate out of the lower end of the container structure after penetrating through the upper end of the container structure;
s3, connecting a spent fuel rod: after the connecting piece penetrates out of the lower end of the container structure, the connecting piece is connected with the spent fuel rod through the connecting piece;
s4, driving the movable shielding rod upwards: the pull rod is pushed in the factory building to drive the movable shielding rod (1) and the connecting piece to move upwards;
s5, rotation of the rotating device: and when the spent fuel rod completely enters the container structure, the connecting piece is disconnected from the spent fuel rod, then the rotating device is driven to enable the container structure to rotate, and when the openings at the upper end and the lower end of the container structure are vertical to the axis of the movable shielding rod (1), the rotating device is stopped being driven.
8. The use method of the single spent fuel rod transfer container according to claim 7, wherein before the connection between the connecting piece and the spent fuel rod is disconnected, the connecting end of the movable shielding rod (1) needs to be fixed through a positioning device above the lower end socket (13).
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| WO2021203332A1 (en) * | 2020-04-08 | 2021-10-14 | 中广核研究院有限公司 | Fuel assembly stabilization device |
| CN113012840B (en) * | 2021-03-23 | 2024-05-14 | 中国原子能科学研究院 | Shielding device for radioactive article transportation |
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