CN112620837A

CN112620837A - Vertical electric spark underwater cutting device for spent fuel assembly of nuclear power station

Info

Publication number: CN112620837A
Application number: CN202011505540.7A
Authority: CN
Inventors: 周绍亮; 乔素凯; 刘长杰; 陈鹏尹; 冯寿希; 田向龙; 王建伟; 任国平; 杨学鹏
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; China Nuclear Power Operation Co Ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-04-09
Anticipated expiration: 2040-12-18
Also published as: CN112620837B

Abstract

The invention relates to a vertical electric spark underwater cutting device for a spent fuel assembly of a nuclear power station, which comprises: the fixing seat is fixed on the wall of the spent fuel storage pool; a vertical rod; the electric spark cutting assembly is arranged on the vertical rod and is positioned below the fixed seat. The above-mentioned scheme that this application provided, through fixing the fixing base back on the spent fuel storage pool wall, adjust the upper and lower position and the turned angle of vertical pole, because the electric spark cutting subassembly sets up on vertical pole, thereby just can adjust the upper and lower position and the turned angle of electric spark cutting subassembly, and then realized the cutting to the not stick of co-altitude, the pulse voltage that the electric spark cutting subassembly can be applyed on through the two poles of the earth simultaneously strikes the production spark discharge with water, the instantaneous high temperature that produces makes the partial micro metal material in cutting surface melt, the realization is to the partial cutting of stick.

Description

Vertical electric spark underwater cutting device for spent fuel assembly of nuclear power station

Technical Field

The invention relates to the technical field of nuclear power stations, in particular to a vertical electric spark underwater cutting device for a spent fuel assembly of a nuclear power station.

Background

The spent fuel related components of the pressurized water reactor nuclear power station are inserted in the fuel components in a matched mode, or flow resistance or reactivity is related, after the irradiated spent fuel related components are discharged, the spent fuel related components are not put into the reactor according to the requirements of the age limit, or disassembly experiments are needed, and after the spent fuel related components are irradiated in the reactor core, the spent fuel related components have extremely high radioactivity, at least 3 meters of underwater shielding must be guaranteed, and field operators are protected from being irradiated by radiation dose.

At present, the vertical electric spark underwater cutting device for the related assemblies of the spent fuel is used for completing the working procedures of separating a sub handle from a single rod, carrying out local or integral cutting on the single rod, loading short rods of the related assemblies into a special container and the like in water containing boric acid, and finally transporting the short rods out of a nuclear power station or storing the short rods in a spent fuel water pool.

However, when the existing spent fuel related assemblies are cut and processed, only the whole single rod can be cut and separated from the related assemblies, the cutting of the related assemblies at local parts or different heights cannot be realized, and the single rod is easy to deform by using a hydraulic shearing mode, so that the processing requirements of nuclear power stations or scientific research units on different spent fuel related assemblies cannot be met.

Disclosure of Invention

Therefore, the vertical electric spark underwater cutting device for the spent fuel assembly of the nuclear power station is needed to be provided for solving the problem that the existing spent fuel assembly of the nuclear power station cannot realize local or different-height cutting of related assemblies during cutting.

The invention provides a vertical electric spark underwater cutting device for a spent fuel assembly of a nuclear power station, which comprises:

the fixing seat is fixed on the wall of the spent fuel storage pool;

the vertical rod is arranged on the fixed seat and can rotate relative to the fixed seat along the axial direction of the vertical rod, and meanwhile, the vertical rod can move up and down relative to the fixed seat;

the electric spark cutting assembly is arranged on the vertical rod and is located below the fixed seat.

Above-mentioned vertical electric spark of nuclear power station spent fuel subassembly is cutting device under water, through fixing the fixing base on the spent fuel storage pool wall back, adjust vertical pole upper and lower position and turned angle, because the electric spark cutting subassembly sets up on vertical pole, thereby just can adjust the upper and lower position and the turned angle of electric spark cutting subassembly, and then realized the cutting to the not high single stick of co-altitude, the electric spark cutting subassembly can be through the impulse voltage who applys on the two poles of the earth with water shock production spark discharge simultaneously, the instantaneous high temperature that produces makes the partial trace metal material in cutting surface melt, realize the partial cutting to the single stick.

In one embodiment, the device further comprises a box body, wherein the box body is connected with the vertical rod and is positioned below the fixed seat;

the electric spark cutting assembly is arranged on the box body and can move on the box body along the axial direction perpendicular to the vertical rod.

In one embodiment, the electric spark cutting assembly comprises a fixed plate, a sliding plate, a cylinder, a driving piece, an electrode seat, an upper electrode plate, a lower electrode plate, a controller and a storage battery;

the fixed plate is fixed on the box body, the sliding plate is arranged on the fixed plate and can slide relative to the fixed plate, the cylinder body is arranged on the sliding plate, the electrode holder is arranged on the cylinder body, the upper electrode plate and the lower electrode plate are arranged on the electrode holder at intervals, the controller and the storage battery are arranged in the cylinder body, the electrode holder is electrically connected with the controller, and the controller is electrically connected with the storage battery;

the driving piece is fixed on the box body, and the telescopic end of the driving piece is connected with the barrel.

In one embodiment, a positioning rod is disposed on a side of the fixed plate facing the sliding plate, the sliding plate is provided with a sliding groove along a sliding direction of the sliding plate, and the positioning rod is located in the sliding groove.

In one embodiment, the spark cutting assembly further comprises a telescopic cylinder and an elastic part, one end of the elastic part is connected with the electrode holder, the other end of the elastic part is connected with the telescopic cylinder, and one end, far away from the elastic part, of the telescopic cylinder is connected with the upper electrode plate.

In one embodiment, the device further comprises a camera, and the camera is arranged above the barrel.

In one embodiment, the device further comprises an illuminating piece, and the illuminating piece is arranged on the camera.

In one embodiment, the dust collector is arranged on the box body.

In one embodiment, the fixing seat comprises a horizontal plate, a first fixing arm, a first rotating screw, a first clamping plate, a second fixing arm, a second rotating screw and a second clamping plate, and the vertical rod is arranged on the horizontal plate;

the first fixing arm and the second fixing arm are oppositely arranged on the bottom surface of the horizontal plate at intervals, the first rotating screw penetrates through the first fixing arm to be connected with the first clamping plate, and the first clamping plate is arranged at one end, facing the second rotating screw, of the first rotating screw; the second rotating screw penetrates through the second fixing arm to be connected with the second clamping plate, and the second clamping plate is arranged at one end, facing the first rotating screw, of the second rotating screw.

In one embodiment, the vertical rod is an electric telescopic rod, an external gear is arranged on one end of the electric telescopic rod facing the fixed seat, an internal gear is arranged on the fixed seat, and the external gear is meshed with the internal gear.

Drawings

Fig. 1 is a schematic structural diagram of a vertical electric spark underwater cutting device for a spent fuel assembly of a nuclear power plant according to an embodiment of the present invention;

FIG. 2 is a schematic view of the fixing base shown in FIG. 1;

FIG. 3 is a schematic view of the spark cutting assembly of FIG. 1;

FIG. 4 is a schematic view of a conventional single rod.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As shown in fig. 1, in an embodiment of the present invention, a vertical electric spark underwater cutting device for a spent fuel assembly of a nuclear power plant is provided, including: fixing base 10, vertical pole 20 and spark-erosion cutting subassembly, wherein, fixing base 10 is fixed on the spent fuel storage pool wall, and vertical pole 20 sets up on fixing base 10, and vertical pole 20 can follow vertical pole 20 axial rotation relatively fixing base 10, and vertical pole 20 can reciprocate relatively fixing base 10 simultaneously, and the spark-erosion cutting subassembly sets up on vertical pole 20, and the spark-erosion cutting subassembly is located the below of fixing base 10.

By adopting the technical scheme, after the fixing seat is fixed on the wall of the spent fuel storage pool, the vertical position and the rotation angle of the vertical rod are adjusted, and the electric spark cutting assembly is arranged on the vertical rod, so that the vertical position and the rotation angle of the electric spark cutting assembly can be adjusted, and then the cutting of single rods with different heights is realized.

In some embodiments, as shown in fig. 1, the vertical electric spark underwater cutting device for a spent fuel assembly of a nuclear power plant further includes a box body 30, the box body 30 is connected with the vertical rod 20, and the box body 30 is located below the fixed base 10; the spark cutting assembly is provided on the case 30 and is movable on the case 30 in an axial direction perpendicular to the vertical rod 20.

After the vertical rod is adjusted in upper and lower position and rotation angle, the box body is arranged on the vertical rod, the electric spark cutting assembly is arranged on the box body, so that the upper and lower position and rotation angle of the electric spark cutting assembly can be adjusted, at the moment, the position of the electric spark cutting assembly on the box body is moved, when the electrode plates on the electric spark cutting assembly are 15mm away from a target single rod, pulse voltage is applied to the two electrode plates on the electric spark cutting assembly, the pulse voltage penetrates water to generate spark discharge, and the generated instantaneous high temperature melts the partial trace metal material on the cutting surface, so that the partial cutting of the single rod is realized.

In some embodiments, as shown in fig. 3, the spark cutting assembly herein includes a fixed plate 401, a sliding plate 402, a cylinder 403, a driving member 404, an electrode holder 405, an upper electrode plate 407, a lower electrode plate 408, a controller, and a storage battery; the fixed plate 401 is fixed on the box body 30, the sliding plate 402 is arranged on the fixed plate 401, the sliding plate 402 can slide relative to the fixed plate 401, the cylinder 403 is arranged on the sliding plate 402, the electrode holder 405 is arranged on the cylinder 403, the upper electrode plate 407 and the lower electrode plate 408 are arranged on the electrode holder 405 at intervals, the controller and the storage battery are arranged in the cylinder 403, the electrode holder 405 is electrically connected with the controller, and the controller is electrically connected with the storage battery; the driving member 404 is fixed on the box 30, and the telescopic end of the driving member 404 is connected with the cylinder 403.

After the position of the box body 30 is adjusted, at this time, the driving part 404, for example, an electric telescopic rod, drives the cylinder 403 to move, because the cylinder 403 is arranged on the sliding plate 402, the sliding plate 402 is arranged on the fixed plate 401, and the sliding plate 402 can slide relative to the fixed plate 401, therefore, the driving part 404 can drive the cylinder 403 to move relative to the fixed plate 401, when the upper electrode plate 407 and the lower electrode plate 408 simultaneously contact the single rod 01 (as shown in fig. 4), the controller switches on the electrode holder 405 and the storage battery, at this time, the pulse voltage applied between the upper electrode plate 407 and the lower electrode plate 408 blows through water to generate spark discharge, the generated instantaneous high temperature melts a local trace metal material on the surface of the single rod 01, and the cutting of the single rod 01 is realized;

in some embodiments, as shown in fig. 3, a positioning rod 4011 is provided on a side of the fixed plate 401 facing the sliding plate 402, the sliding plate 402 is provided with a sliding slot 4021 in a sliding direction of the sliding plate 402, and the positioning rod 4011 is located in the sliding slot 4021. When the driving member 404 drives the cylinder 403 to move, since the cylinder 403 is fixed on the sliding plate 402, the sliding plate 402 can move along the sliding slot 4021 relative to the fixed plate 401.

It should be noted that the connection structure of the fixed plate and the sliding plate in the embodiment of the present application is only an example, and in other alternative solutions, other structures may also be adopted, for example, a sliding slot is provided on the fixed plate, and the sliding plate is located in the sliding slot. The present application does not specifically limit the connecting structure of the fixed plate and the sliding plate as long as the above-described structure can achieve the object of the present application.

In some embodiments, as shown in fig. 3, the spark cutting assembly itself further includes a telescopic cylinder 406 and an elastic member, one end of the elastic member is connected to the electrode holder 405, the other end of the elastic member is connected to the telescopic cylinder 406, and the end of the telescopic cylinder 406 away from the elastic member is connected to the upper electrode plate 407.

When the driving part 404 drives the cylinder 403 to move relative to the fixing plate 401, the upper electrode plate 407 on the electrode holder 405 on the cylinder 403 moves synchronously, when the upper electrode plate 407 contacts with the single rod 01, at this time, the driving part 404 continues to drive the cylinder 403 to move, the upper electrode plate 407 compresses the elastic part, when the upper electrode plate 407 and the lower electrode plate 408 simultaneously contact with the single rod 01, the driving part 404 stops moving, the controller is connected with the electrode holder 405 and the storage battery, at this time, pulse voltage applied between the upper electrode plate 407 and the lower electrode plate 408 punches water through to generate spark discharge, and the generated instantaneous high temperature melts a local trace metal material on the surface of the single rod 01, so that the single rod 01 is cut.

In some embodiments, in order to conveniently observe the positions of the upper electrode plate 407 and the lower electrode plate 408 and the single rod 01, as shown in fig. 3, the vertical electric discharge underwater cutting device for a spent fuel assembly of a nuclear power plant in the present application further includes a camera 501, and the camera 501 is disposed above the cylinder 403.

The camera 501 may be a video camera, and the position of the underwater single rod 01 is observed by the video camera, so that the positions of the upper electrode plate 407, the lower electrode plate 408 and the single rod 01 can be conveniently adjusted.

Further, due to the fact that underwater light is dim and the position of the single rod 01 cannot be conveniently shot, as shown in fig. 3, the vertical type electric spark underwater cutting device for the spent fuel assembly of the nuclear power plant further comprises an illuminating piece 502, and the illuminating piece 502 is arranged on the camera 501. When the camera 501 operates, the illuminating device 502, such as an illuminating lamp, is turned on, so that light can be provided for the camera 501, which is beneficial to shooting of the camera 501.

In some embodiments, in order to adsorb the cut dust, as shown in fig. 3, the vertical electric discharge underwater cutting device for a spent fuel assembly of a nuclear power plant further includes a dust collecting member 60, and the dust collecting member 60 is disposed on the box 30. The dust collected by cutting can be collected by activating the dust collecting member 60, and the dust collecting member 60 is an existing underwater vacuum cleaner, and since the underwater vacuum cleaner is a prior art, it will not be described herein in a repeated manner.

In some embodiments, in order to facilitate fixing the fixing base 10 to the wall of the spent fuel storage pool, as shown in fig. 2, the fixing base 10 in the present application includes a horizontal plate 101, a first fixing arm 102, a first rotating screw 103, a first clamping plate 104, a second fixing arm 105, a second rotating screw 106, and a second clamping plate 107, and the vertical rod 20 is disposed on the horizontal plate 101; the first fixing arm 102 and the second fixing arm 105 are oppositely arranged on the bottom surface of the horizontal plate 101 at intervals, the first rotating screw 103 penetrates through the first fixing arm 102 to be connected with the first clamping plate 104, and the first clamping plate 104 is arranged at one end, facing the second rotating screw 106, of the first rotating screw 103; the second rotating screw 106 passes through the second fixing arm 105 and is connected to a second clamping plate 107, and the second clamping plate 107 is disposed at an end of the second rotating screw 106 facing the first rotating screw 103.

When using, place horizontal plate 101 on the pond edge for the spent fuel subassembly, let first clamp plate 104 and second clamp plate 107 be located the both sides on pond edge respectively simultaneously, at this moment, rotate first rotation screw rod 103, first rotation screw rod 103 drives first clamp plate 104 and is close to the pond edge, rotate the second simultaneously and rotate screw rod 106, second rotation screw rod 106 drives second clamp plate 107 and is close to the pond edge, thereby just can press from both sides tight pond edge through first clamp plate 104 and second clamp plate 107, and then make horizontal plate 101 fix on the pond edge.

It should be noted that the structure of the fixing base in the embodiment of the present application is merely an example, and in other alternative schemes, other structures may be adopted, for example, the fixing base is a hydraulic clamping arm. The specific structure of the fixing seat is not particularly limited in the application, and the purpose of the application can be realized by the structure.

In some embodiments, the vertical rod 20 in the present application is an electric telescopic rod, and an external gear is disposed on one end of the electric telescopic rod facing the fixed base 10, and an internal gear is disposed on the fixed base 10, and the external gear is engaged with the internal gear.

Can the holistic length of regulator through electric telescopic handle to conveniently adjust the upper and lower position that is located the electric spark cutting subassembly on vertical pole, rotate vertical pole 20 through external force, because vertical pole 20 is provided with the external gear towards one of fixing base 10, be provided with the internal gear on the fixing base 10, thereby just can rotate vertical pole 20, and then conveniently adjust the turned angle who is located the electric spark cutting subassembly on vertical pole.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a vertical electric spark of nuclear power station spent fuel subassembly is cutting device under water which characterized in that includes:

the fixing seat (10), the said fixing seat (10) is fixed on pool wall of the spent fuel storage pool;

the vertical rod (20) is arranged on the fixed seat (10), the vertical rod (20) can rotate relative to the fixed seat (10) along the axial direction of the vertical rod (20), and meanwhile the vertical rod (20) can move up and down relative to the fixed seat (10);

the electric spark cutting assembly is arranged on the vertical rod (20) and is located below the fixed seat (10).

2. The vertical electric spark underwater cutting device for the spent fuel assembly of the nuclear power plant as claimed in claim 1, further comprising a box body (30), wherein the box body (30) is connected with the vertical rod (20), and the box body (30) is located below the fixed seat (10);

the electric spark cutting assembly is arranged on the box body (30) and can move on the box body (30) along the axial direction perpendicular to the vertical rod (20).

3. The vertical electric spark underwater cutting device for the spent fuel assembly of the nuclear power plant as claimed in claim 2, wherein the electric spark cutting assembly comprises a fixing plate (401), a sliding plate (402), a cylinder (403), a driving piece (404), an electrode holder (405), an upper electrode plate (407), a lower electrode plate (408), a controller and a storage battery;

the fixed plate (401) is fixed on the box body (30), the sliding plate (402) is arranged on the fixed plate (401), the sliding plate (402) can slide relative to the fixed plate (401), the cylinder body (403) is arranged on the sliding plate (402), the electrode holder (405) is arranged on the cylinder body (403), the upper electrode plate (407) and the lower electrode plate (408) are arranged on the electrode holder (405) at intervals, the controller and the storage battery are arranged in the cylinder body (403), the electrode holder (405) is electrically connected with the controller, and the controller is electrically connected with the storage battery;

the driving piece (404) is fixed on the box body (30), and the telescopic end of the driving piece (404) is connected with the barrel body (403).

4. The vertical electric spark underwater cutting device for the spent fuel assembly of the nuclear power plant as claimed in claim 3, wherein a positioning rod (4011) is arranged on one side of the fixing plate (401) facing the sliding plate (402), the sliding plate (402) is provided with a sliding groove (4021) along the sliding direction of the sliding plate (402), and the positioning rod (4011) is located in the sliding groove (4021).

5. The vertical electric spark underwater cutting device for the spent fuel assembly of the nuclear power plant as claimed in claim 3, wherein the electric spark cutting assembly further comprises a telescopic cylinder (406) and an elastic member, one end of the elastic member is connected with the electrode holder (405), the other end of the elastic member is connected with the telescopic cylinder (406), and one end, far away from the elastic member, of the telescopic cylinder (406) is connected with the upper electrode plate (407).

6. The vertical electric spark underwater cutting device for the spent fuel assembly of the nuclear power plant as claimed in claim 3, further comprising a camera (501), wherein the camera (501) is arranged above the barrel (403).

7. The vertical electric spark underwater cutting device for the spent fuel assembly of the nuclear power plant as claimed in claim 6, further comprising an illuminating piece (502), wherein the illuminating piece (502) is arranged on the camera (501).

8. The vertical electric discharge underwater cutting device for the spent fuel assembly of the nuclear power plant as claimed in claim 2, further comprising a dust collecting member (60), wherein the dust collecting member (60) is disposed on the box body (30).

9. The vertical electric spark underwater cutting device for the spent fuel assembly of the nuclear power plant as claimed in claim 1, wherein the fixed seat (10) comprises a horizontal plate (101), a first fixed arm (102), a first rotating screw (103), a first clamping plate (104), a second fixed arm (105), a second rotating screw (106) and a second clamping plate (107), and the vertical rod (20) is arranged on the horizontal plate (101);

the first fixing arm (102) and the second fixing arm (105) are arranged on the bottom surface of the horizontal plate (101) at an interval, the first rotating screw (103) penetrates through the first fixing arm (102) to be connected with the first clamping plate (104), and the first clamping plate (104) is arranged at one end, facing the second rotating screw (106), of the first rotating screw (103); the second rotating screw (106) penetrates through the second fixing arm (105) to be connected with the second clamping plate (107), and the second clamping plate (107) is arranged at one end, facing the first rotating screw (103), of the second rotating screw (106).

10. The vertical electric spark underwater cutting device for the spent fuel assembly of the nuclear power plant as claimed in claim 1, wherein the vertical rod (20) is an electric telescopic rod, an external gear is arranged on one end of the electric telescopic rod facing the fixed seat (10), an internal gear is arranged on the fixed seat (10), and the external gear is meshed with the internal gear.