CA2723210C - Plug demounting apparatus for heavy water reactor fuel system - Google Patents
Plug demounting apparatus for heavy water reactor fuel system Download PDFInfo
- Publication number
- CA2723210C CA2723210C CA2723210A CA2723210A CA2723210C CA 2723210 C CA2723210 C CA 2723210C CA 2723210 A CA2723210 A CA 2723210A CA 2723210 A CA2723210 A CA 2723210A CA 2723210 C CA2723210 C CA 2723210C
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- plug
- housing
- stem
- coupled
- dismounting apparatus
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- 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
- G21C19/115—Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements with latching devices and ball couplings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
Provided is a plug dismounting apparatus for a heavy water reactor fuel system. The plug dismounting apparatus for dismounting a plug (10) that is mounted on a fuel element in a heavy water reactor fuel system, and includes a locking rim (11) formed along an inner circumference thereof and a push pipe (12), includes: a clamp housing (100) made up of an outer housing (110) having a plurality of ball holes (111) formed in a radial direction and inserted into an inner diametrical region of the plug (10) and an inner housing (120) having a stem bush (121); locking balls (200) coupled to the ball holes (111) of the outer housing (110), and locked on the locking rim (11) so as to fix the clamp housing (100) to the plug (10); a guide liner (300) having a release groove (310) formed so as to guide release of the locking balls (200), and coupled so as to guide sliding of the inner and outer housings (120 and 110); elastic members (400) interposed between the guide liner (300) and the clamp housing (100), and restoring the released locking balls (200) so as to be elastically locked; a latch ram (500) coupled so as to slide into an inner diametrical region of the inner housing (120), and pressurizing an inner surface of the plug (10); a hollow main stem (600) screwed to the stem bush (121) of the inner housing (120) so as to slide the latch ram (500); and a sub-stem (700) coupled to an inner diametrical region of the main stem (600) and pressurizing the push pipe (12) so as to dismount the plug (10).
Description
PLUG DISMOUNTING APPARATUS FOR HEAVY WATER REACTOR FUEL SYSTEM
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates, in general, to a plug dismounting apparatus for a heavy water reactor fuel system, and more particularly to a plug dismounting apparatus for a heavy water reactor fuel system, capable of dismounting a plug mounted on a fuel element in the heavy water reactor fuel system with ease, rapidity, and precision Description of the Prior Art As is well known in the art, a heavy water reactor is a type of nuclear reactor that uses heavy water as a coolant and a moderator. The heavy water reactor is equipped with a fuel system where plugs are mounted on each fuel element.
The plug is dismounted from the fuel element for various purposes.
Conventionally, a lug-type fixing apparatus has been fixed to dismount the plug, and then the plug has been dismounted or mounted by tightening a handle using nuts.
Such a lug-type fixing apparatus has the following problems.
First, since the lug-type fixing apparatus is fixed using nuts when the plug is dismounted and then the handle is tightened, much time is required, and thus there is a problem with radiation exposure.
Further, the lug-type fixing apparatus has a problem in that it must be positioned by rotating the lug at an angle of 90 when the plug is mounted and dismounted.
Particularly, when it is difficult to dismount the plug because of the close contact with the fuel element, the lug-type fixing apparatus must be removed along with the plug while undergoing 4187946 vi a strong shock. As such, equipment is easily damaged.
Furthermore, for application to various plugs, a spool is inserted into the lug-type fixing apparatus when used, and then is put into a hole for storage using taping. As such, the spool may be lost.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a plug dismounting apparatus for a heavy water reactor fuel system, capable of easily and rapidly dismounting and Jo mounting a plug, which is mounted on a fuel element in the heavy water reactor fuel system, to minimize damage from radiation exposure, and easily dismounting the plug to maximize the convenience of use.
Another object of the present invention is to provide a plug dismounting apparatus for a heavy water reactor fuel system, capable of simply and easily dismounting a plug, which is in close contact with a fuel element in a heavy water reactor fuel system, to previously prevent damage caused by a shock as in the related art.
In order to achieve the above objects, according to one aspect of the present invention, there is provided a plug dismounting apparatus for a heavy water reactor fuel system which is used to dismount a plug mounted on a fuel element in the heavy water reactor fuel system and has a locking rim formed along an inner circumference thereof and a push pipe. The plug dismounting apparatus includes: a clamp housing made up of an outer housing having a plurality of ball holes formed in a radial direction and inserted into an inner diametrical region of the plug and an inner housing having a stem bush; locking balls coupled to the ball holes of the outer housing and locked on the locking rim so as to fix the clamp housing to the plug; a guide liner having a release groove formed so as to guide release of the locking balls and coupled so as to guide sliding of the inner
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates, in general, to a plug dismounting apparatus for a heavy water reactor fuel system, and more particularly to a plug dismounting apparatus for a heavy water reactor fuel system, capable of dismounting a plug mounted on a fuel element in the heavy water reactor fuel system with ease, rapidity, and precision Description of the Prior Art As is well known in the art, a heavy water reactor is a type of nuclear reactor that uses heavy water as a coolant and a moderator. The heavy water reactor is equipped with a fuel system where plugs are mounted on each fuel element.
The plug is dismounted from the fuel element for various purposes.
Conventionally, a lug-type fixing apparatus has been fixed to dismount the plug, and then the plug has been dismounted or mounted by tightening a handle using nuts.
Such a lug-type fixing apparatus has the following problems.
First, since the lug-type fixing apparatus is fixed using nuts when the plug is dismounted and then the handle is tightened, much time is required, and thus there is a problem with radiation exposure.
Further, the lug-type fixing apparatus has a problem in that it must be positioned by rotating the lug at an angle of 90 when the plug is mounted and dismounted.
Particularly, when it is difficult to dismount the plug because of the close contact with the fuel element, the lug-type fixing apparatus must be removed along with the plug while undergoing 4187946 vi a strong shock. As such, equipment is easily damaged.
Furthermore, for application to various plugs, a spool is inserted into the lug-type fixing apparatus when used, and then is put into a hole for storage using taping. As such, the spool may be lost.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a plug dismounting apparatus for a heavy water reactor fuel system, capable of easily and rapidly dismounting and Jo mounting a plug, which is mounted on a fuel element in the heavy water reactor fuel system, to minimize damage from radiation exposure, and easily dismounting the plug to maximize the convenience of use.
Another object of the present invention is to provide a plug dismounting apparatus for a heavy water reactor fuel system, capable of simply and easily dismounting a plug, which is in close contact with a fuel element in a heavy water reactor fuel system, to previously prevent damage caused by a shock as in the related art.
In order to achieve the above objects, according to one aspect of the present invention, there is provided a plug dismounting apparatus for a heavy water reactor fuel system which is used to dismount a plug mounted on a fuel element in the heavy water reactor fuel system and has a locking rim formed along an inner circumference thereof and a push pipe. The plug dismounting apparatus includes: a clamp housing made up of an outer housing having a plurality of ball holes formed in a radial direction and inserted into an inner diametrical region of the plug and an inner housing having a stem bush; locking balls coupled to the ball holes of the outer housing and locked on the locking rim so as to fix the clamp housing to the plug; a guide liner having a release groove formed so as to guide release of the locking balls and coupled so as to guide sliding of the inner
2 4187946 vl =
and outer housings; elastic members interposed between the guide liner and the clamp housing and restoring the released locking balls so as to be elastically locked; a latch ram coupled so as to slide into an inner diametrical region of the inner housing and pressurizing an inner surface of the plug; a hollow main stem screwed to the stem bush of the inner housing so as to slide the latch ram; and a sub-stem coupled to an inner diametrical region of the main stem and pressurizing the push pipe so as to dismount the plug.
In exemplary embodiments, the sub-stem may include a first bearing mounted on one end thereof, and the first bearing may rotatably support the sub-stem that is rotated to pressurize the push pipe.
In exemplary embodiments, the sub-stem may include a tap hole bored in one end thereof so as to adjust a pressurization distance on the plug having a different shape.
In exemplary embodiments, the outer housing may include housing handles that slide the clamp housing along the guide liner.
In exemplary embodiments, the guide liner may include a push lever that slides the guide is liner along the clamp housing.
In exemplary embodiments, the main stem may include a stem handle, and the sub-stem may include a plurality of handlebars in a radial direction.
According to the present invention realized by the aforementioned means, since the clamp housing slides along the guide liner and is elastically locked on the locking rim of the plug, it is easy to mount and dismount the clamp housing, and thus the plug mounted on the fuel element in the heavy water reactor fuel system is rapidly dismounted and mounted to be able to minimize damage from radiation exposure.
Further, the present invention can previously prevent damage caused by a shock as in the related art by simply and easily dismounting the plug, which is into close contact with the fuel element, using the sub-stem.
and outer housings; elastic members interposed between the guide liner and the clamp housing and restoring the released locking balls so as to be elastically locked; a latch ram coupled so as to slide into an inner diametrical region of the inner housing and pressurizing an inner surface of the plug; a hollow main stem screwed to the stem bush of the inner housing so as to slide the latch ram; and a sub-stem coupled to an inner diametrical region of the main stem and pressurizing the push pipe so as to dismount the plug.
In exemplary embodiments, the sub-stem may include a first bearing mounted on one end thereof, and the first bearing may rotatably support the sub-stem that is rotated to pressurize the push pipe.
In exemplary embodiments, the sub-stem may include a tap hole bored in one end thereof so as to adjust a pressurization distance on the plug having a different shape.
In exemplary embodiments, the outer housing may include housing handles that slide the clamp housing along the guide liner.
In exemplary embodiments, the guide liner may include a push lever that slides the guide is liner along the clamp housing.
In exemplary embodiments, the main stem may include a stem handle, and the sub-stem may include a plurality of handlebars in a radial direction.
According to the present invention realized by the aforementioned means, since the clamp housing slides along the guide liner and is elastically locked on the locking rim of the plug, it is easy to mount and dismount the clamp housing, and thus the plug mounted on the fuel element in the heavy water reactor fuel system is rapidly dismounted and mounted to be able to minimize damage from radiation exposure.
Further, the present invention can previously prevent damage caused by a shock as in the related art by simply and easily dismounting the plug, which is into close contact with the fuel element, using the sub-stem.
3 4187946 vi BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:
FIG. 1 is an assembled perspective view illustrating an embodiment of the present invention;
FIG. 2 is a disassembled perspective view illustrating an embodiment of the present invention;
0 FIG. 3 is a cross-sectional view illustrating an embodiment of the present invention;
FIGS. 4 through 6 illustrate a process of mounting a clamp housing on a plug according an embodiment of the present invention; and FIGS. 7 through 9 illustrate a process of dismounting a plug using a latch ram, a main stem, and a sub-stem according an embodiment of the present invention.
<Description of symbols of the main parts in the drawings>
10: plug 11: locking rim 12: push pipe 13: jaw 14: inner surface 100: clamping housing 110: outer housing 111: ball hole 112: mounting groove 113: housing handle 114: handle bracket 120: inner housing 121: stem bush 122, 640: female thread 200: locking ball 300: guide liner 310: release groove 320: operation long slot 330: push lever 400: elastic member
The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:
FIG. 1 is an assembled perspective view illustrating an embodiment of the present invention;
FIG. 2 is a disassembled perspective view illustrating an embodiment of the present invention;
0 FIG. 3 is a cross-sectional view illustrating an embodiment of the present invention;
FIGS. 4 through 6 illustrate a process of mounting a clamp housing on a plug according an embodiment of the present invention; and FIGS. 7 through 9 illustrate a process of dismounting a plug using a latch ram, a main stem, and a sub-stem according an embodiment of the present invention.
<Description of symbols of the main parts in the drawings>
10: plug 11: locking rim 12: push pipe 13: jaw 14: inner surface 100: clamping housing 110: outer housing 111: ball hole 112: mounting groove 113: housing handle 114: handle bracket 120: inner housing 121: stem bush 122, 640: female thread 200: locking ball 300: guide liner 310: release groove 320: operation long slot 330: push lever 400: elastic member
4 4187946 v1 500: latch ram 600: main stem 610, 710: male thread 620: second bearing 630: stem handle 700: sub-stem 720: first bearing 730: handlebar DETAILED DESCRIPTION OF THE INVENTION
Reference will now be made in greater detail to exemplary embodiments of the invention with reference to the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings and the description to refer to the same or like parts.
As illustrated in FIGS. 1 through 3, the present invention provides a plug dismounting apparatus for a heavy water reactor fuel system which is used to dismount a plug 10 mounted on a fuel element in the heavy water reactor fuel system and has a locking rim 11 formed along an inner circumference thereof and a push pipe 12. The plug dismounting apparatus includes: a clamp housing 100 made up of an outer housing 110 having a plurality of ball holes 1 l 1 formed in a radial direction and inserted into an inner diametrical region of the plug 10 and an inner housing 120 having a stem bush 121; locking balls 200 coupled to the ball holes 111 of the outer housing 110 and locked on the locking rim 11 so as to fix the clamp housing 100 to the plug 10; a guide liner 300 having a release groove 310 formed so as to guide release of the locking balls 200 and coupled so as to guide sliding of the inner and outer housings 120 and 110;
elastic members 400 interposed between the guide liner 300 and the clamp housing 100 and restoring the released locking balls 200 so as to be elastically locked; a latch ram 500 coupled so as to slide into an inner diametrical region of the inner housing 120 and pressurizing an inner surface of the plug 10; a hollow main stem 600 screwed to the stem bush 121 of the inner housing 120 so as to slide the latch ram 500; and a sub-stem 700 coupled to an inner diametrical region of the main stem 600 and pressurizing the push pipe 12 so as to dismount the plug 10.
Reference will now be made in greater detail to exemplary embodiments of the invention with reference to the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings and the description to refer to the same or like parts.
As illustrated in FIGS. 1 through 3, the present invention provides a plug dismounting apparatus for a heavy water reactor fuel system which is used to dismount a plug 10 mounted on a fuel element in the heavy water reactor fuel system and has a locking rim 11 formed along an inner circumference thereof and a push pipe 12. The plug dismounting apparatus includes: a clamp housing 100 made up of an outer housing 110 having a plurality of ball holes 1 l 1 formed in a radial direction and inserted into an inner diametrical region of the plug 10 and an inner housing 120 having a stem bush 121; locking balls 200 coupled to the ball holes 111 of the outer housing 110 and locked on the locking rim 11 so as to fix the clamp housing 100 to the plug 10; a guide liner 300 having a release groove 310 formed so as to guide release of the locking balls 200 and coupled so as to guide sliding of the inner and outer housings 120 and 110;
elastic members 400 interposed between the guide liner 300 and the clamp housing 100 and restoring the released locking balls 200 so as to be elastically locked; a latch ram 500 coupled so as to slide into an inner diametrical region of the inner housing 120 and pressurizing an inner surface of the plug 10; a hollow main stem 600 screwed to the stem bush 121 of the inner housing 120 so as to slide the latch ram 500; and a sub-stem 700 coupled to an inner diametrical region of the main stem 600 and pressurizing the push pipe 12 so as to dismount the plug 10.
5 4187946 vi The clamp housing 100 is generally divided into the outer housing 110 and the inner housing 120, both of which are formed in a cylindrical shape. The inner housing 120 is inserted into the outer housing 110. Here, the outer and inner housings 110 and 120 are connected by connection pins 130 with an appropriate gap formed between an inner surface of the outer housing 110 and an outer surface of the inner housing 120.
The plurality of ball holes 111 are radially bored in one end of the outer housing 110, and are coupled with locking balls 200. Each ball hole 111 is designed such that its inner diameter is reduced in a radial outward direction, thereby keeping the coupled locking ball 200 from escaping in the radial outward direction. Further, the outer housing 110 is provided with mounting grooves to 112 in the other end thereof in which the elastic members 400 are mounted, thereby preventing arbitrary movement of the elastic members 400. It should be noted that the mounting groove 112 may be formed in various shapes depending on how the elastic member 400 is realized. For example, if each elastic member 400 is realized as a coil spring, the mounting grooves 112 are formed in the other end of the outer housing 110 at proper intervals such that a plurality of coil springs are mounted. Further, the outer housing 110 is provided with housing handles 113 on an outer surface of the other end thereof so as to be opposite to each other in a diametrical direction, thereby sliding the outer housing 110, and the resulting clamp housing 100. To this end, the outer housing 110 is provided with handle brackets 114 on the outer surface of the other end thereof so as to be opposite to each other in a diametrical direction, thereby firmly fixing the housing handles 113.
The stem bush 121 is provided on one side of the inner housing 120, and is provided with female threads 122 in an inner circumferential surface thereof.
The guide liner 300 guides sliding of the clamp housing 100 made up of the inner and outer housings 120 and 110. The guide liner 300 is provided with a release groove 310 in an outer circumference of one end thereof, thereby releasing the locking balls 200.
Further, the guide liner
The plurality of ball holes 111 are radially bored in one end of the outer housing 110, and are coupled with locking balls 200. Each ball hole 111 is designed such that its inner diameter is reduced in a radial outward direction, thereby keeping the coupled locking ball 200 from escaping in the radial outward direction. Further, the outer housing 110 is provided with mounting grooves to 112 in the other end thereof in which the elastic members 400 are mounted, thereby preventing arbitrary movement of the elastic members 400. It should be noted that the mounting groove 112 may be formed in various shapes depending on how the elastic member 400 is realized. For example, if each elastic member 400 is realized as a coil spring, the mounting grooves 112 are formed in the other end of the outer housing 110 at proper intervals such that a plurality of coil springs are mounted. Further, the outer housing 110 is provided with housing handles 113 on an outer surface of the other end thereof so as to be opposite to each other in a diametrical direction, thereby sliding the outer housing 110, and the resulting clamp housing 100. To this end, the outer housing 110 is provided with handle brackets 114 on the outer surface of the other end thereof so as to be opposite to each other in a diametrical direction, thereby firmly fixing the housing handles 113.
The stem bush 121 is provided on one side of the inner housing 120, and is provided with female threads 122 in an inner circumferential surface thereof.
The guide liner 300 guides sliding of the clamp housing 100 made up of the inner and outer housings 120 and 110. The guide liner 300 is provided with a release groove 310 in an outer circumference of one end thereof, thereby releasing the locking balls 200.
Further, the guide liner
6 4187946 v1 300 is provided with operation long slots 320 so as to guide sliding of the connection pins 130 connecting the inner and outer housings 120 and 110. In addition, the guide liner 300 is provided with a push lever 330 on the other end thereof, so that it can slide along the clamp housing 100.
The elastic members 400 are interposed between the guide liner 300 and the clamp housing 100, and elastically restore the locking balls 200 located in the release groove 310. As illustrated in FIGS. 1 and 2, each elastic member 400 may be realized as a coil spring having a compressive force. However, it should be noted that each elastic member 400 may be realized as, for instance, a leaf spring having a compressive force if necessary.
As illustrated in FIG. 1, the latch ram 500 is formed in a cylindrical shape, and is slidably coupled into an inner diametrical region of the inner housing 120. Thereby, one end of the latch ram 500 pressurizes an inner surface 14 of the plug 10. Thus, the clamp housing 100 of the present invention is firmly fixed to the plug 10 by the locking balls 200 and the latch ram 500.
The main stem 600 has a hollow structure, and linearly slides the latch ram 500 along an axial direction of the inner housing 120. The main stem 600 is provided with male threads 610 on an outer circumferential surface thereof, and thus is screwed to the female threads 122 formed on the stem bush 121 of the inner housing 120. The main stem 600 is provided with a second bearing 620 at one end thereof, and is connected to the latch ram 500. Thus, when rotated in one direction, the main stem 600 slides the latch mm 500 relative to the screwed inner housing 120 in a forward or backward direction. The main stem 600 is provided with a stem handle 630 at the other end thereof, thereby facilitating the rotation of the main stem 600. Further, the main stem 600 is provided with female threads 640 in an inner circumferential surface thereof.
The sub-stem 700 is screwed into the main stem 600, and pressurizes the push pipe 12 of the plug 10. The sub-stem 700 is provided with male threads 710 on an outer circumferential surface of one end thereof, and thus is screwed to the female threads 640 of the main stem 600.
The sub-stem 700 is provided with a first bearing 720 at one end thereof, thereby promoting
The elastic members 400 are interposed between the guide liner 300 and the clamp housing 100, and elastically restore the locking balls 200 located in the release groove 310. As illustrated in FIGS. 1 and 2, each elastic member 400 may be realized as a coil spring having a compressive force. However, it should be noted that each elastic member 400 may be realized as, for instance, a leaf spring having a compressive force if necessary.
As illustrated in FIG. 1, the latch ram 500 is formed in a cylindrical shape, and is slidably coupled into an inner diametrical region of the inner housing 120. Thereby, one end of the latch ram 500 pressurizes an inner surface 14 of the plug 10. Thus, the clamp housing 100 of the present invention is firmly fixed to the plug 10 by the locking balls 200 and the latch ram 500.
The main stem 600 has a hollow structure, and linearly slides the latch ram 500 along an axial direction of the inner housing 120. The main stem 600 is provided with male threads 610 on an outer circumferential surface thereof, and thus is screwed to the female threads 122 formed on the stem bush 121 of the inner housing 120. The main stem 600 is provided with a second bearing 620 at one end thereof, and is connected to the latch ram 500. Thus, when rotated in one direction, the main stem 600 slides the latch mm 500 relative to the screwed inner housing 120 in a forward or backward direction. The main stem 600 is provided with a stem handle 630 at the other end thereof, thereby facilitating the rotation of the main stem 600. Further, the main stem 600 is provided with female threads 640 in an inner circumferential surface thereof.
The sub-stem 700 is screwed into the main stem 600, and pressurizes the push pipe 12 of the plug 10. The sub-stem 700 is provided with male threads 710 on an outer circumferential surface of one end thereof, and thus is screwed to the female threads 640 of the main stem 600.
The sub-stem 700 is provided with a first bearing 720 at one end thereof, thereby promoting
7 4187946 vi smooth rotation of the sub-stem 700 pressurizing the push pipe 12. A plurality of handlebars 730 are installed on the other end of the sub-stem 700, so that it is possible to apply greater external force when the push pipe 12 is pressurized.
Overall operation of the present invention constructed in this way will be described below in detail with reference to the attached drawings.
First, as in FIG. 4, to mount the present invention on the plug 10, the clamp housing 100 gets close to an outer end of the plug 10. In this state, when the housing handles 113 are pulled, the elastic members 400, i.e. the coil springs, are contracted, and thus the outer housing 110 slides along the guide liner 300 in a backward direction. Thereby, the locking balls 200 are put in the i 0 release groove 310 of the guide liner 300 as in FIG. 5. As a result, the outer housing 110 is inserted into the inner diametrical region of the plug 10 as in FIG. 5.
Subsequently, when the outer housing 110 is pulled in a forward direction, the locking balls 200 are caught on an inner side of the locking rim 11, and thus are fixed to the plug 10 as in FIG. 6.
Then, when the stem handle 630 is turned in an arrow direction shown in FIG.
7, the main stem 600 is rotated to slide the latch ram 500 in a forward direction as in FIG. 7. In FIG. 7, the latch ram 600 is not in contact with the inner surface 14 of the plug 10.
However, when the stem handle 630 is continuously turned, the latch ram 600 comes into contact with the inner surface 14 of the plug 10.
Next, when the handlebars 730 are turned in an arrow direction shown in FIG.
Overall operation of the present invention constructed in this way will be described below in detail with reference to the attached drawings.
First, as in FIG. 4, to mount the present invention on the plug 10, the clamp housing 100 gets close to an outer end of the plug 10. In this state, when the housing handles 113 are pulled, the elastic members 400, i.e. the coil springs, are contracted, and thus the outer housing 110 slides along the guide liner 300 in a backward direction. Thereby, the locking balls 200 are put in the i 0 release groove 310 of the guide liner 300 as in FIG. 5. As a result, the outer housing 110 is inserted into the inner diametrical region of the plug 10 as in FIG. 5.
Subsequently, when the outer housing 110 is pulled in a forward direction, the locking balls 200 are caught on an inner side of the locking rim 11, and thus are fixed to the plug 10 as in FIG. 6.
Then, when the stem handle 630 is turned in an arrow direction shown in FIG.
7, the main stem 600 is rotated to slide the latch ram 500 in a forward direction as in FIG. 7. In FIG. 7, the latch ram 600 is not in contact with the inner surface 14 of the plug 10.
However, when the stem handle 630 is continuously turned, the latch ram 600 comes into contact with the inner surface 14 of the plug 10.
Next, when the handlebars 730 are turned in an arrow direction shown in FIG.
8, the sub-stem 700 is rotated to pressurize the push pipe 12, so that the plug 10 fixed to a fuel element by a jaw 13 as in FIG. 8 can be dismounted.
As described above, the process of dismounting the present invention fixed to the plug 10 proceeds in a reverse order of the description above, and thus description thereof will be omitted.
The present invention has been described with reference to the exemplary embodiment 4187946 vi disclosed above. The scope of the claims should not be limited by the preferred embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole.
As described above, the process of dismounting the present invention fixed to the plug 10 proceeds in a reverse order of the description above, and thus description thereof will be omitted.
The present invention has been described with reference to the exemplary embodiment 4187946 vi disclosed above. The scope of the claims should not be limited by the preferred embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole.
9 4187946 vi
Claims (7)
1. A plug dismounting apparatus for a heavy water reactor fuel system which is used to dismount a plug that is mounted on a fuel element in the heavy water reactor fuel system and has a locking rim formed along an inner circumference thereof and a push pipe, the plug dismounting apparatus comprising:
a clamp housing made up of an outer housing having a plurality of ball holes formed in a radial direction and inserted into an inner diametrical region of the plug and an inner housing having a stem bush;
locking balls coupled to the ball holes of the outer housing, and locked on the locking rim so as to fix the clamp housing to the plug;
a guide liner having a release groove formed so as to guide release of the locking balls, and coupled so as to guide sliding of the inner and outer housings;
elastic members interposed between the guide liner and the clamp housing, and restoring the released locking balls so as to be elastically locked;
a latch ram coupled so as to slide into an inner diametrical region of the inner housing, and pressurizing an inner surface of the plug;
a hollow main stem screwed to the stem bush of the inner housing so as to slide the latch ram; and a sub-stem coupled to an inner diametrical region of the main stem and pressurizing the push pipe so as to dismount the plug.
a clamp housing made up of an outer housing having a plurality of ball holes formed in a radial direction and inserted into an inner diametrical region of the plug and an inner housing having a stem bush;
locking balls coupled to the ball holes of the outer housing, and locked on the locking rim so as to fix the clamp housing to the plug;
a guide liner having a release groove formed so as to guide release of the locking balls, and coupled so as to guide sliding of the inner and outer housings;
elastic members interposed between the guide liner and the clamp housing, and restoring the released locking balls so as to be elastically locked;
a latch ram coupled so as to slide into an inner diametrical region of the inner housing, and pressurizing an inner surface of the plug;
a hollow main stem screwed to the stem bush of the inner housing so as to slide the latch ram; and a sub-stem coupled to an inner diametrical region of the main stem and pressurizing the push pipe so as to dismount the plug.
2. The plug dismounting apparatus according to claim 1, wherein the sub-stem includes a first bearing mounted on one end thereof, and the first bearing rotatably supports the sub-stem that is rotated to pressurize the push pipe.
3. The plug dismounting apparatus according to claim 1, wherein the sub-stem includes a tap hole bored in one end thereof so as to adjust a pressurization distance on the plug.
4. The plug dismounting apparatus according to claim 1, wherein the outer housing includes housing handles that slide the clamp housing along the guide liner.
5. The plug dismounting apparatus according to claim 1, wherein the guide liner includes a push lever that slides the guide liner along the clamp housing.
6. The plug dismounting apparatus according to claim 1, wherein the main stem includes a stem handle.
7. The plug dismounting apparatus according to claim 1, wherein the sub-stem includes a plurality of handlebars in a radial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2723210A CA2723210C (en) | 2010-12-02 | 2010-12-02 | Plug demounting apparatus for heavy water reactor fuel system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2723210A CA2723210C (en) | 2010-12-02 | 2010-12-02 | Plug demounting apparatus for heavy water reactor fuel system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2723210A1 CA2723210A1 (en) | 2012-06-02 |
| CA2723210C true CA2723210C (en) | 2014-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2723210A Active CA2723210C (en) | 2010-12-02 | 2010-12-02 | Plug demounting apparatus for heavy water reactor fuel system |
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| Country | Link |
|---|---|
| CA (1) | CA2723210C (en) |
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| Publication number | Publication date |
|---|---|
| CA2723210A1 (en) | 2012-06-02 |
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