CN115064291A - Positioning and centering device and method for closed reactor refueling system - Google Patents
Positioning and centering device and method for closed reactor refueling system Download PDFInfo
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- CN115064291A CN115064291A CN202210269016.7A CN202210269016A CN115064291A CN 115064291 A CN115064291 A CN 115064291A CN 202210269016 A CN202210269016 A CN 202210269016A CN 115064291 A CN115064291 A CN 115064291A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003758 nuclear fuel Substances 0.000 title claims abstract description 17
- 238000012546 transfer Methods 0.000 claims abstract description 137
- 239000000446 fuel Substances 0.000 claims abstract description 49
- 230000000712 assembly Effects 0.000 claims description 13
- 238000000429 assembly Methods 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 10
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 9
- 229910052708 sodium Inorganic materials 0.000 claims description 9
- 239000011734 sodium Substances 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 7
- 239000000443 aerosol Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 2
- 239000000463 material Substances 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000002915 spent fuel radioactive waste Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000032258 transport Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/10—Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
-
- 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention discloses a positioning and centering device and a positioning and centering method for a closed reactor refueling system. Wherein, the location centering device includes: an operating portion conforming in shape and size to the head of the reactor fuel assembly for grasping by a grasping portion of the transfer machine; the measuring device comprises a connecting part, a measuring part and a control part, wherein one end of the connecting part is connected with the operating part, the end surface of the other end of the connecting part is provided with a mounting groove, the measuring part is matched with the mounting groove and detachably mounted in the mounting groove, and the center line of the measuring part is superposed with the center line of the connecting part; the measuring part is used for colliding a fuel assembly in the loading and unloading elevator when the grabbing part grabs the positioning and centering device to form a mark, and the mark is used for measuring the centering degree between the grabbing part and the loading and unloading elevator.
Description
Technical Field
The embodiment of the invention relates to the technical field of closed refueling of reactors, in particular to a positioning and centering device and method for a closed refueling system of a reactor.
Background
Due to the particularity of the coolant in the reactor, the refueling of some reactors, such as pool sodium cooling experimental fast reactors, must be carried out in a closed refueling mode, and a closed refueling system can be generally used for refueling. During the reloading, when the center between two reloading equipment corresponds in the closed reloading system, just can smoothly pass through between two reloading equipment again for fuel assembly, can not make and produce great stress between longer fuel assembly and the equipment, and then lead to fuel assembly to block or set up the damage.
However, with closed reloading, reloading is generally performed in a hot and invisible state, and it is difficult to determine whether the centers of two reloading apparatuses (e.g., a transfer machine and a loading and unloading elevator) in the closed reloading system correspond to each other.
Disclosure of Invention
According to one aspect of the invention, a positioning and centering device for a closed reactor refueling system is provided. The refueling system is including being located the outer transportation room transfer machine of reactor to and be located the lifting machine of feeding, the lifting machine of unloading of reactor, the portion of snatching of transfer machine is arranged in snatching the reactor fuel assembly and puts into or takes out in the lifting machine of feeding and unloading. The positioning and centering device comprises: an operating portion conforming in shape and size to the head of the reactor fuel assembly for grasping by a grasping portion of the transfer machine; the measuring device comprises a connecting part, a measuring part and a control part, wherein one end of the connecting part is connected with the operating part, the end surface of the other end of the connecting part is provided with a mounting groove, the measuring part is matched with the mounting groove and detachably mounted in the mounting groove, and the center line of the measuring part is superposed with the center line of the connecting part; the measuring part is used for colliding a fuel assembly in the loading and unloading elevator when the grabbing part grabs the positioning and centering device to form a mark, and the mark is used for measuring the centering degree between the grabbing part and the loading and unloading elevator.
According to another aspect of the invention, a positioning and centering method for a closed reactor refueling system is provided, which comprises the following steps: placing a positioning and centering device as described in the embodiments in a gripping section of a transfer machine in a transfer chamber; the reactor container is communicated with the transfer chamber, the in-reactor refueling system is controlled to grab a fuel assembly and place the fuel assembly in a loading and unloading hoister, and the loading and unloading hoister drives the fuel assembly to ascend; positioning a guide post in the transfer machine to a loading channel or an unloading channel; controlling the transfer machine to drive the positioning centering device to descend to a first preset position and collide the fuel assembly, so that sodium aerosol adhered to the head of the fuel assembly contacts a measuring part in the positioning centering device, and marks are formed on the measuring part; and taking out the positioning and centering device, and judging whether the loading channel or the unloading channel of the transfer machine corresponds to the center of the loading and unloading elevator or not according to the position relation between the center of the mark on the measuring part and the center of the measuring part.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
Fig. 1 is a partial schematic structural view of a closed refueling system according to one embodiment of the invention.
FIG. 2 is a schematic structural view of a fuel assembly header according to one embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a positioning and centering device according to an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a positioning and centering device according to another embodiment of the invention.
FIG. 5 is a partial cross-sectional view of the positioning and centering device of FIG. 4.
FIG. 6 is a schematic view of the positioning and centering device of FIG. 4 from another perspective.
FIG. 7 is a schematic diagram of a method of measuring centering according to one embodiment of the invention.
It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.
Description of reference numerals:
101. a reactor vessel; 102. a transfer machine; 103. a loading and unloading elevator; 104. a stack top seal; 105. a material replacing machine; 200. a fuel assembly header;
10. an operation part 11, a taper part; 20. a connecting portion; 30. a measuring section; 31. a center; 32. marking; 40. a guide portion; 50. a fastener.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. It should be apparent that the described embodiment is one embodiment of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
It is to be noted that technical terms or scientific terms used herein should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs, unless otherwise defined. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either solution A, or solution B, or both solutions A and B. Furthermore, spatially relative terms, such as "above," "below," "top," "bottom," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures, and should be understood to encompass different orientations of the element or feature in use or operation in addition to the orientation depicted in the figures.
One embodiment of the invention provides a positioning and centering device which can be used for positioning and centering between a transfer machine and a loading and unloading elevator in a closed material changing system. Fig. 1 shows a schematic partial structure of a closed refueling system according to one embodiment of the invention. As shown in fig. 1, the closed refueling system includes an out-of-pile refueling device and an in-pile refueling device. Wherein, the outer reloading device of heap includes: a transfer chamber transfer machine 102, a new component loader, a spent fuel tilt lift, a transfer drum, a purge chamber transfer machine, a stack top seal 104. The in-pile refueling device comprises a refueling machine 105, a first cock, a second cock, a loading and unloading elevator 103 and a control rod moving guide pipe. The transfer chamber transfer machine 102 has a gripping portion, and can be used to grip the fuel assembly and place the fuel assembly into the loading and unloading elevator 103 or take the fuel assembly out of the loading and unloading elevator 103. The transfer chamber is provided with a loading and unloading channel, the loading and unloading elevator can lift the fuel assembly to the corresponding position of the loading and unloading channel, and the grabbing part of the transfer chamber transfer machine 102 can take out or put in the fuel assembly in the loading and unloading elevator 103 through the loading and unloading channel.
When the refueling is carried out, the fuel assemblies need to be loaded and unloaded through the cooperation of the transfer chamber transfer machine 102 and the loading and unloading elevator 103. Specifically, when the spent fuel is discharged, the refueling machine transports the spent fuel assemblies in the reactor container 101 to the loading and unloading elevator 103, the loading and unloading elevator 103 lifts the spent fuel assemblies to the upper part, and the transfer chamber transfer machine 102 transports the spent fuel assemblies to the conversion barrel. When new fuel is loaded into the reactor, new fuel assemblies are loaded into the conversion barrel, the new fuel assemblies in the conversion barrel are transported to the loading and unloading elevator 103 through the transfer chamber transfer machine 102, the loading and unloading elevator 103 transports the new fuel assemblies to reactor core accessories in the reactor vessel, and then the new fuel assemblies are transported to the specified position of the reactor core through the refueling machine.
In the material changing process, in order to judge the center corresponding condition of the fuel assemblies in the transfer chamber transfer machine and the loading and unloading elevator and avoid the problems that the grabbing part of the transfer machine is clamped or even deformed and the like due to inaccurate positioning of the transfer machine, the positioning and centering device in the embodiment of the invention is adopted to judge and measure the centering degree of the centers of the assemblies in the transfer machine and the loading and unloading elevator and also can correct the positioning error of the transfer chamber transfer machine. In addition, the positioning and centering device in the embodiment of the invention can also be applied to measurement and correction of the centering degree between other devices in the closed refueling system.
Fig. 3 shows a schematic structural diagram of a positioning and centering device according to an embodiment of the invention. As shown in fig. 3, the positioning and centering device in the present embodiment includes an operation portion 10, a connection portion 20, and a measurement portion 30.
Wherein the handling section 10 is shaped and sized in conformity with the head 200 of the reactor fuel assembly for gripping by the gripping section of the transfer machine 102. In particular, in use, the gripping portion of the transfer machine 102 may grip the tapered portion 11 at the end of the operating portion 10. This embodiment will the one end of location centering device sets up to be unanimous with fuel assembly's head shape and size, can utilize the portion of snatching of current transfer machine 102 to snatch, need not to add the portion of snatching in addition and can realize snatching of location centering device, and can firmly lock location centering device, avoid location centering device to break away from snatch the portion.
In this embodiment, one end of the connecting portion 20 is connected to the operating portion 10, and the end surface of the other end is provided with a mounting groove (not shown). The measuring part 30 is matched with the mounting groove and detachably mounted in the mounting groove, and the center line of the measuring part 30 is overlapped with the center line of the connecting part 20. The measuring part 30 is used for impacting fuel assemblies in the loading and unloading elevator 103 when the grabbing part grabs the positioning and centering device to form marks, and the marks are used for measuring the centering degree between the transfer machine and the loading and unloading elevator 103.
The measuring part 30 is detachably installed in the installation groove, and the measuring part 30 can be replaced after the completion of one-time alignment measurement, so that the next measurement can be performed. The center lines of the measuring part 30 and the connecting part 20 are arranged to be overlapped, so that the center of the section of the measuring part 30 is overlapped with the center of the section of the connecting part 20, whether the center of the positioning centering device corresponds to the center of the fuel assembly in the material handling lifter 103 or not is judged through the center of the measuring part 30, and whether the grabbing part corresponds to the center of the material handling lifter or not is further judged.
When carrying out the measurement to the centering, the sodium aerosol that fuel assembly head 200 was stained with the location centering device collision during the fuel assembly, the sodium aerosol that the fuel assembly head was stained with can contact measuring portion 30 and the sediment solidifies and is in form the seal of a government organization in measuring portion 30. Specifically, the imprint is a circular imprint equal to the diameter of the end face of the fuel assembly header 200. Whether the grabbing part of the transfer machine 102 corresponds to the center of the loading and unloading elevator can be judged according to the position relation between the center of the mark 32 on the measuring part 30 and the center 31 of the measuring part 30. In addition, the position of the transfer machine 102 may be adjusted according to the distance between the center of the mark 32 and the center of the measuring portion 30, so that the gripping portion of the transfer machine 102 corresponds to the center of the loading and unloading elevator 103.
In this embodiment, the connecting portion 20 and the measuring portion 30 are cylindrical, so that the whole positioning and centering device is in a central symmetry shape, and the centering degree can be measured conveniently. Meanwhile, the positioning and centering device is matched with the loading and unloading channel of the transfer chamber in shape, so that the positioning and centering device can conveniently enter and exit. Furthermore, the cylindrical coupling 20 also facilitates positioning of the centering device in and out of the rack barrel of the transfer machine, preventing other shaped (e.g., square) couplings 20 from becoming stuck in the rack of the transfer machine.
Further, the radial dimension of the connecting portion 20 is larger than that of the operating portion 10, and the radial dimension of the measuring portion 30 is smaller than that of the connecting portion 20, so that the radial dimension of the measuring portion 30 can be larger than that of the operating portion 10, the radial dimension of the measuring portion is maximally increased, and the deviation degree between the gripping portion of the transfer machine 102 and the center of the fuel assembly in the loading and unloading elevator can be measured when the deviation degree is large.
As shown in fig. 4, in the present embodiment, the positioning and centering device further includes a guide portion 40. The guiding portion 40 is connected between the connecting portions 20 of the operating portion 10, and the guiding portion 40 is used for guiding the connecting portions 20 to enter and exit the rack barrel in the transfer machine 102. Since the radial dimension of the connecting portion 20 is greater than the radial dimension of the operating portion 10, when the connecting portion enters and exits the rack barrel of the transfer machine 102, the plane step between the connecting portion 20 and the operating portion 10 is easily caught in the rack, and in this embodiment, by providing the guide portion 40, the shoulder of the connecting portion 20 can be prevented from being caught in the rack of the transfer machine, so that the positioning and centering device smoothly enters and exits the rack barrel of the transfer machine.
Specifically, as shown in fig. 4, the guide portion 40 is inclined with respect to the connection portion 20, and the guide portion 40 has a predetermined inclination angle α with respect to the connection portion 20. For example, the predetermined inclination angle α between the connection portion 20 and the guide portion may be 30 °.
In the present embodiment, as shown in fig. 5, the measuring part 30 is installed in the installation groove by a plurality of fastening members 50, so that the measuring part 30 is firmly installed in the installation groove, preventing the measuring part 30 from falling out of the installation groove. Wherein the fastener 50 may be a screw. Specifically, the fastening members 50 are connected to the measuring part 30 through the side wall of the mounting groove, and the plurality of fastening members 50 are uniformly distributed along the circumferential direction of the connecting part 20, so that the stress applied to the measuring part 30 is uniformly distributed. Optionally, the fastening element 50 is recessed in the side of the connecting portion 20, so as to prevent the fastening element 50 from protruding from the connecting portion 20 and causing the connecting portion 20 to get stuck in and out of the rack drum of the transfer machine 102. Of course, the top surface of the fastening member 50 may be flush with the side surface of the connecting portion 20, as long as the fastening member 50 protrudes from the side surface of the connecting portion 20.
In some embodiments, the operating portion 10, the connecting portion 20, and the guiding portion 40 may be made of stainless steel, such as 304, 316, 321, 2Cr13, and the like. The measuring portion 30 may be made of aluminum so that the marking 32 is easily generated when the measuring portion collides against the fuel assembly. In addition, the positioning and centering device in the embodiment is not easy to deform in a high-temperature environment, and can be used in a hot closed material changing system.
In some embodiments, the operation portion 10 and the connection portion 20 or the guide portion 40 may be connected by welding. The connecting portion 20 and the guide portion 40 are integrally formed. Alternatively, the operation portion 10, the connection portion 20 and the guide portion 40 may be integrally formed. Optionally, all of the positioning and centering devices are subjected to sharp-edge blunting.
An embodiment of the invention also provides a positioning and centering method for the closed reactor refueling system, which comprises the following steps.
Step S100, the positioning and centering device is placed in the gripping section of the transfer machine 102 in the transfer chamber. The positioning and centering device can be any one of the positioning and centering devices in the above embodiments, and the positioning and centering device is used for measuring the centering degree between the transfer machine and the loading and unloading elevator in the closed material changing system. The centering degree represents the center corresponding degree of a grabbing part of the transfer machine and a lifting bucket of the loading and unloading hoister, and the lifting bucket is used for loading and unloading the fuel assembly by the loading and unloading hoister.
And S200, communicating the reactor container 101 with the transfer chamber, controlling the in-reactor refueling system to grab a fuel assembly and place the fuel assembly in the loading and unloading hoister 103, and driving the fuel assembly to ascend by the loading and unloading hoister 103.
And S300, positioning a guide post in the transfer machine to a loading channel or an unloading channel.
And S400, controlling the transfer machine to drive the positioning centering device to descend to a first preset position and collide the fuel assembly, so that sodium aerosol adhered to the head of the fuel assembly contacts a measuring part in the positioning centering device, and forming marks on the measuring part.
And S500, taking out the positioning and centering device, and judging whether the loading channel or the unloading channel of the transfer machine corresponds to the center of the loading and unloading elevator or not according to the position relation between the center of the mark on the measuring part and the center of the measuring part.
By adopting the positioning and centering method in the embodiment, whether the transfer machine is centered with the bucket of the loading and unloading elevator can be judged.
In step S100, the air in the transfer chamber is first replaced by air before entering the transfer chamber, and the positioning and centering device is placed in the gripping section of the transfer machine. Specifically, the sealing door of the transfer chamber is first opened to replace the gas in the transfer chamber with air. Simultaneously, measure the indoor oxygen content of transportation, work as the indoor gaseous oxygen content of transportation is qualified after, operating personnel can get into the room of transportation. Subsequently, the operator may place the transfer machine 102 at a position such that the gripping portion of the transfer machine 102 can be lowered to the first predetermined position. And then controlling the grabbing part of the transfer machine to descend to open the grabbing part, and placing the positioning and centering device in the grabbing part.
In step S200, to communicate the reactor vessel and the transfer chamber, the transfer chamber is first sealed and the air in the transfer chamber is replaced with an inert gas. And then opening a top seal of the reactor vessel and blocking the circulation of the metal coolant in the reactor so as to communicate the reactor vessel with a transfer chamber.
Specifically, after the operator exits the transfer chamber, a sealing door of the transfer chamber is closed to replace the air in the transfer chamber with an inert gas, such as argon. At the same time, the gas content in the transfer chamber is measured and is qualified when the gas content meets the requirements, for example when the oxygen content in the transfer chamber is less than 1000 ppm. At this point, the top seal 104 may be opened and the sodium baffle set down to block the circulation of the reactor metal coolant and communicate the reactor vessel 101 and the transfer chamber. In this embodiment, the stack top seal 104 may be a stack top sealing plug.
After communicating the reactor vessel 101 and the transfer chamber, reactor fuel assemblies may be placed into the handling elevator 103 via an in-stack refueling system. The refueling machine in the in-pile refueling device can grab a fuel assembly and transport the fuel assembly to the loading and unloading elevator 103. Wherein the fuel component may be a steel component. The handling elevator 103 can then bring the fuel assembly up to a predetermined position, for example, to a position near the mouth of the loading channel or the unloading channel.
In step S300, the guide posts of the transfer machine are positioned to the loading channel or the unloading channel, and specifically, the guide posts may be positioned to the loading channel (for example, at 0 mm) or the unloading channel (for example, at 690 mm) according to the commissioning report.
In step S400, in order to enable the positioning and centering device to measure the position of the component in the loading and unloading elevator 103, the rack of the transfer machine may be controlled to descend to a first predetermined position, and then the gripping part of the transfer machine may be manually descended until the clutch is disengaged, so that the measuring part 30 of the positioning and centering device contacts the head of the component in the loading and unloading elevator 103. The sodium aerosol carried on the component head will be carried on the measuring portion 30 and form a circular imprint of the same size as the component head.
After the positioning and centering device is placed in the grabbing part of the transfer machine 102, the grabbing part of the transfer machine 102 and the positioning and centering device enter a rack barrel of the transfer machine to lock the grabbing part.
In step S500, to take out the positioning and centering device, the transfer machine is first controlled to drive the positioning and centering device to ascend to a second predetermined position, and the guide posts are adjusted to rotate the gripping portion of the transfer machine to a detachable position. Specifically, the grabbing part is lifted to the upper position, and then the rack is lifted to the upper position, so that the grabbing part is located at a second preset position. Also, the guide post needs to be rotated to rotate the gripper portion of the transfer machine 102 to the detachable position. The detachable position corresponds to a position where the positioning and centering device grabbed by the grabbing part can be removed.
Then, controlling the flow of the metal coolant in the reactor, and closing a top seal of the reactor vessel to disconnect the reactor vessel from the transfer chamber. Specifically, the sodium blocking device is lifted to circulate the metal coolant in the reactor, and then the top sealing element is closed, so that the channel between the reactor vessel and the transfer chamber is closed.
And finally, replacing the air in the transfer chamber with air, and entering the transfer chamber to take out the positioning and centering device. Air replacement is carried out by opening a sealing door of the transfer chamber until the oxygen content in the transfer chamber is not alarmed, and an operator can enter the transfer chamber only after the oxygen content in the transfer chamber is greater than 20%. After an operator enters the transfer chamber, the grabbing part of the transfer machine is lowered to be disengaged, and the positioning and centering device in the grabbing part is taken down to measure the centering degree.
During measurement, whether the loading channel or the unloading channel of the transfer machine corresponds to the center of the loading and unloading elevator or not can be judged according to the position relation between the center of the mark on the measuring part and the center of the measuring part.
Wherein, when the center of the print 32 coincides with the center 31 of the measuring part, the loading passage or the unloading passage of the transfer machine 102 corresponds to the center of the loading and unloading elevator 103.
When the center of the mark 32 is not coincident with the center 31 of the measuring part, the position of the guide post of the transfer machine is adjusted according to the distance between the center of the mark and the center of the measuring part until the center of the mark is coincident with the center of the measuring part. Specifically, a distance h between the center of the mark and the center of the measuring portion may be measured, and the position of the guide post may be adjusted, wherein the adjusted distance of the guide post is equal to the measured distance. Taking the measurement of the loading channel as an example, if the alignment result of the loading channel is measured that the mark 32 is deviated from the measuring part center 31 and the distance between the two is 22mm, the guide post distance is adjusted, for example, when the initial loading channel is positioned to 0mm, the guide post is adjusted to position the loading channel to 22 mm. Taking the measurement of the discharge channel as an example, if the alignment result of the discharge channel is that the mark 32 is deviated from the center 31 of the measuring part and the distance between the mark and the center is 17mm, the distance of the guide post is adjusted, for example, when the initial discharge channel is positioned to 690mm, the guide post is adjusted to position the discharge channel to 703 mm.
After the guide post is adjusted, positioning and centering measurement are needed to be carried out again so as to judge whether the transfer machine corresponds to the center of the bucket of the loading and unloading hoister after adjustment.
By adopting the positioning and centering method in the embodiment, the center corresponding situation of the transfer chamber transfer machine and the loading and unloading elevator bucket can be judged under the thermal state and invisible condition. The guide post position of the transfer machine in the transfer chamber is adjusted through centering, so that the grabbing part of the transfer machine and a bucket of the loading and unloading elevator are centered. In addition, the positioning and centering device provided by the embodiment of the invention can also correct installation errors of the transfer chamber transfer machine after the maintenance is finished, and can also verify and correct the centering degree of all other equipment in the closed type material changing system.
It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.
Claims (14)
1. A positioning and centering device for a reactor closed refueling system is characterized in that the refueling system comprises a transfer chamber transfer machine positioned outside a reactor, a charging elevator and a discharging elevator positioned in the reactor, wherein a grabbing part of the transfer machine is used for grabbing reactor fuel assemblies to be placed in or taken out of the charging and discharging elevator;
the positioning and centering device comprises:
an operating portion conforming in shape and size to the head of the reactor fuel assembly for grasping by a grasping portion of the transfer machine;
one end of the connecting part is connected with the operating part, the end surface of the other end of the connecting part is provided with an installation groove,
the measuring part is matched with the mounting groove and detachably mounted in the mounting groove, and the center line of the measuring part is superposed with the center line of the connecting part;
the measuring part is used for colliding a fuel assembly in the loading and unloading elevator when the grabbing part grabs the positioning and centering device to form a mark, and the mark is used for measuring the centering degree between the grabbing part and the loading and unloading elevator.
2. The positioning and centering device of claim 1, wherein said connecting portion and said measuring portion are cylindrical.
3. The positioning-centering device of claim 1 or 2, wherein a radial dimension of the connecting portion is greater than a radial dimension of the operating portion.
4. The positioning and centering device of claim 3, further comprising:
the guide part is connected with the operation part and between the connecting parts and used for guiding the connecting parts when the connecting parts pass in and out the rack barrel in the transfer machine.
5. The device of claim 4, wherein the guide portion is inclined with respect to the connecting portion, and the guide portion has a predetermined inclination with respect to the connecting portion.
6. The positioning and centering device of any one of claims 1 to 5, wherein said measuring portion is mounted in said mounting groove by a plurality of fasteners.
7. The device of claim 6, wherein the fastener passes through a side wall of the mounting groove to connect with the measuring portion, and the fastener is recessed in a side surface of the connecting portion.
8. A positioning and centering method for a closed reactor refueling system is characterized by comprising the following steps:
placing the alignment and centering device of any of claims 1-7 in a gripping portion of a transfer machine in a transfer chamber;
the reactor container is communicated with the transfer chamber, the in-reactor refueling system is controlled to grab a fuel assembly and place the fuel assembly in a loading and unloading hoister, and the loading and unloading hoister drives the fuel assembly to ascend;
positioning a guide post in the transfer machine to a loading channel or an unloading channel;
controlling the transfer machine to drive the positioning centering device to descend to a first preset position and collide the fuel assembly, so that sodium aerosol adhered to the head of the fuel assembly contacts a measuring part in the positioning centering device, and marks are formed on the measuring part;
and taking out the positioning and centering device, and judging whether the loading channel or the unloading channel of the transfer machine corresponds to the center of the loading and unloading elevator or not according to the position relation between the center of the mark on the measuring part and the center of the measuring part.
9. The method of claim 8, wherein the loading lane or the unloading lane of the transfer machine corresponds to a center of the loading elevator when a center of the impression coincides with a center of the measuring portion.
10. The method according to claim 8 or 9, wherein when the center of the imprint does not coincide with the center of the measuring part, the position of the guide post of the transfer machine is adjusted according to the distance between the center of the imprint and the center of the measuring part until the center of the imprint coincides with the center of the measuring part.
11. The method of claim 8, wherein placing the alignment and centering device in a gripping portion of a transfer machine in a transfer chamber comprises:
and after the air in the transfer chamber is replaced by air, the air enters the transfer chamber, and the positioning and centering device is arranged in a grabbing part of the transfer machine.
12. The method of claim 11, wherein communicating the reactor vessel with the transfer chamber comprises:
sealing the transfer chamber to replace the air in the transfer chamber with an inert gas;
opening a top seal of the reactor vessel to block the flow of metal coolant within the reactor to communicate the reactor vessel with a transfer chamber.
13. The method of claim 8, wherein removing the positioning and centering device comprises:
the transfer machine drives the positioning and centering device to ascend to a second preset position, and the guide column is adjusted to enable the grabbing part of the transfer machine to rotate to a detachable position;
controlling the flow of metal coolant within the reactor to close a reactor head seal of the reactor vessel to disconnect the reactor vessel from the transfer chamber;
and replacing the gas in the transfer chamber with air, and entering the transfer chamber to take out the positioning and centering device.
14. The method of claim 10, wherein adjusting the position of the guide post of the transfer machine based on the distance between the center of the footprint and the center of the measurement portion comprises:
measuring the distance between the center of the mark and the center of the measuring part, and adjusting the position of the guide post;
wherein the adjustment distance of the guide post is equal to the measured distance.
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