KR100216503B1 - Nuclear fuel handling apparatus - Google Patents

Abstract

The present invention is a nuclear fuel handling device, a nuclear fuel handling device for securely holding the fuel assembly to move safely without separation between the top fixture and the lower part during operation, a plurality of thimbles in which a control rod for controlling the nuclear reaction is inserted A finger drive device for coupling the fuel assembly to the fuel assembly using a finger hole formed in the upper fixture of the nuclear fuel assembly and having a tube, an upper fixture which bundles the upper ends of the thimble tubes together with a bundle, and a lattice plate supporting and reinforcing the middle portion; A fuel handling device for use in transporting a fuel assembly comprising a sleeve expanding device inserted into a thimble tube to more tightly couple with the fuel assembly and a finger driving device and a frame for supporting the sleeve expanding device.

Description

Nuclear fuel handling equipment

1 is a schematic perspective view of a portion of a fuel assembly;

2 is a schematic perspective view of a conventional fuel handling device.

3 is a partial cross-sectional view for explaining the operation of the finger of the conventional fuel handling device.

4 is a schematic diagram of a nuclear fuel handling apparatus of the present invention.

5 is a partial cross-sectional view showing a partial cross section of the upper part of the operating unit and the fuel assembly in the present invention.

6 is a cross-sectional view taken along line VI-VI of FIG.

7 is a cross-sectional view taken along line VII-VII of FIG. 5,

8 is a cross-sectional view taken along line VII-VII of FIG. 5,

9 is a sectional view taken along line VII-VII of FIG.

10 is a cross-sectional view for explaining the connecting pipes.

11 is a cross-sectional view of the operation unit,

12 is a plan view of the operation unit.

13 is a partial cross-sectional view for explaining the fixed plate and the moving plate portion of the sleeve expansion device

14 is a partial cross-sectional view for explaining the connection of the plates.

FIG. 15 is an enlarged view of the portion denoted by B in FIG.

16-a is a partial sectional view of the expansion sleeve of the expansion bushing,

Figure 16-b is a partial cross sectional view of the expansion sleeve when the expansion sleeve is compression-combined.

17 is a partial cross-sectional view for explaining the processing method of the expansion sleeve.

The present invention relates to a nuclear fuel handling apparatus. In particular, it relates to a nuclear fuel handling device that can be safely handled without damaging the fuel used in nuclear power plants.

Nuclear fuel used in the nuclear power plant has a variety of forms, of which the approximate form of nuclear fuel associated with the present invention is a bundle of nuclear fuel with a head as shown in FIG. This bundle of fuel is also called a fuel assembly.

A large number is installed around the thimble tube 11 into which the control rod of nuclear fuel is inserted. The thimble tube is bundled in a number of pieces and is supported by a grating plate 12 made by attaching an upper plate 14 to the top and a lower plate to the bottom (not shown) and attaching an iron plate in a honeycomb shape to the middle portion. This grating serves to fix the gap between each thimble tube.

At the top of the fuel bundle is a fuel top fixture 14 over the grating 12. The fixture has a square bucket shape as shown, the end 15 of which is exposed after the thimble tube penetrates from the center portion, and guide holes 16-1 and 16-2 at the corner portions. , 16-3). And the finger hole 17 is drilled in the side wall. This finger hole is a hole where a finger of the fuel handling device is engaged when the fuel bundle is lifted or charged in the reactor.

A conventional fuel handling device is schematically shown in FIG.

This fuel handling device is a device for lifting or transporting a bundle of fuel as shown in FIG.

This handling device has four fingers 21 fitted into and engaged with a finger hole 17 formed in the upper fixture 14 of the nuclear fuel bundle. The portions of the fingers 21 to be inserted into the finger holes are bent at right angles and connected to the housing by the pins 22. Thus, it can be widened and narrowed to the center of the axis of the housing, and this operation is operated by the finger actuator 24 provided at the center of the housing 25. In FIG. 3, when the automatic rod is in the raised position, the finger is lifted to the center, and when the finger actuator is in the lowered state, the finger is widened outward and inserted into the finger hole formed in the upper fixing body of the fuel assembly. The fuel assembly is combined.

In addition, there is an elongated connecting pipe 27 integrally coupled with the housing, and in the connecting pipe, a finger actuator is freely moved up and down, and an operation handle 26 is provided on the upper end of the finger actuator. It is integrally connected to and projects out of the connecting pipe. The upper end of the connecting pipe is formed with a work hole 28 for hanging on the crane, and the positioning knob 29 is attached. In addition, the operation knob for moving the finger actuator is a spring-loaded positioning mechanism using the through-hole of the connecting pipe can be fixed in two positions on the top and bottom.

Thus, if the handle is lifted up and positioned at the top, the fingers of the finger actuators are pinched. On the contrary, when the handle is lowered and positioned at the bottom, the fingers are opened to be engaged with the fixture. The finger actuator is a heavy weight body, but it is designed to be operated only by the force required to move the finger actuator because the finger actuator is pushed up by installing a spring in the connecting pipe.

When the nuclear fuel assembly is combined with the conventional fuel handling device configured to be lifted and transported from the fuel reservoir, the upper fixing body 14 of the fuel assembly cannot be separated from the lower fuel assembly because it does not win the weight of the lower part. Occasionally, there is a risk of causing a situation such as radiation leakage. In other words, there is a concern that the top of the fixing body 14, the thimble tube 11 and the grid 12 of the assembly is separated.

It is an object of the present invention to provide a nuclear fuel handling device for securely holding a spent fuel assembly so as to prevent such an accident so that the upper stationary body and the lower part can be safely moved during operation.

The present invention is intended for use in transporting fuel assemblies having a plurality of thimbly tubes into which control rods for controlling nuclear reactions are inserted, a top fixture which bundles the tops of these thimbles, and a lattice plate supporting and reinforcing the middle portion. A nuclear fuel handling device, comprising: an alignment device for coupling to an upper fixing body of a fuel assembly, a finger driving device for coupling with the fuel assembly using a finger hole formed in the upper fixing body of the nuclear fuel assembly, and a thimble tube A sleeve expansion device inserted into the nuclear fuel assembly and more securely coupled to the nuclear fuel assembly, and a frame for supporting the finger driving device and the sleeve expansion device.

An embodiment of the present invention will be described with reference to the drawings.

As shown schematically in FIG. 4, the configuration of the apparatus is composed of an operation unit 41 on the upper side, an operating unit 43 on the lower side, and a connecting portion 42 connecting the operation unit and the operating unit. The operation part includes an operation part of the finger drive device and an operation part of the sleeve expansion device, and a handle part of the frame. The actuating part includes an actuating part of the finger drive device and an actuating part of the sleeve expanding device, and has a lower housing of the frame for supporting them. The connecting portion includes a drive shaft of the finger drive device, a drive shaft of the sleeve expansion device, and a spring device for lightly manipulating a heavy object in the long pipe of the frame.

FIG. 5 is a partial cross-sectional view showing a partial cross section of the upper portion of the operating unit and the fuel assembly, FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5, FIG. 7 is a cross-sectional view taken along the line X-V of FIG. 5, and FIG. VII-VII line sectional drawing of FIG. 9 is VII-VII line sectional drawing of FIG. 5 shows a case in which the left and right sides are symmetrical with respect to the one-dot chain line, which is the centerline, but the right half shows the state before the finger drive is operated, and the left half shows the case where the finger is pushed out and inserted into the finger hole by the finger drive. will be.

The finger drive device has a configuration similar to that of the prior art, in which four fingers 51 (two are shown in FIG. 5) coupled to the finger holes 17 formed in the upper fixing body 14 are shown. It is coupled to the housing 70 of the frame by pins 52. These fingers 51 are bent at right angles to be inserted into the finger holes, and are connected to the housing by pins 52. Therefore, it is possible to widen and narrow the center of the housing shaft.

The finger actuator 58 is installed in the housing so as to be movable up and down. The finger actuator is integrally connected to the finger actuator connecting pipe 59.

The housing is connected to the operation unit by being connected to the long housing connecting pipe 71 integrally coupled.

10 is a cross-sectional view for explaining the connecting pipes.

The housing 70 is coupled to the connecting sleeve 72 by the set screw 73 and then coupled to the housing connecting pipe 71 by the set screw 74.

The finger drive device connection pipe 59 is installed in the housing connection pipe 71, and the expansion device connection pipe is installed inside.

11 is a cross-sectional view of the operation portion, and FIG. 12 is a plan view of the operation portion.

One end of the handle rod 60 is integrally coupled to the finger drive connecting pipe 59 at an upper end thereof, and a spring cap 62 is coupled to the other end of the handle rod 6. 61) are combined. And between the finger handle and the handle rod 60, a spring 63 is pushed between the spring cap and the handle is installed to always push the finger handle toward the support pipe (75).

The handle rod 60, the spring cap 62, the finger handle 61 and the spring 63 coupled to these finger drive connecting pipes 59 are installed on both sides so as to be easily operated by two hands.

In the support pipe 75, two holes are inserted into the upper and lower holes in which the finger handles can be inserted, and these two holes are connected by long holes. The size is not enough to pass. Therefore, if the finger handles are pulled out of the support pipe and moved upward or downward, and the finger handles are inserted into the holes again, the finger drive connecting pipe is fixed and fixed.

The operation of the finger drive device configured in this way is that when the finger handle is placed in the upper position, the finger is pinched and separated from the upper fixing body. When the finger handle is lowered and fixed in the lower position, the fingers are opened and inserted into the finger hole of the upper fixing body. It is combined with the top of the assembly.

That is, if the finger handle located at the upper side is removed from the upper hole of the support pipe and moved downward, the finger drive connecting pipe is moved downward, and the finger actuator 58 is pushed down to push the fingers outward, It is coupled to a stagnant fingerhole. If you operate the finger knob in reverse, the finger bends will be retracted and removed. The left half of FIG. 11 shows a state in which the finger drive unit is coupled to the upper fixture, and the right half shows a state in which the finger drive unit is separated from the fixture.

Next, the sleeve expansion device will be described. FIG. 13 is a partial cross-sectional view for explaining the fixed plate and the moving plate portion of the sleeve expansion device, and FIG. 14 is a partial cross-sectional view for explaining the connection of the plates.

The sleeve expansion device has a plurality of expansion rods 53 (see FIG. 5). The expansion rods are respectively coupled to the fixed plate 57, the moving plate 56, a part of its components.

The fixed plate 57 is coupled with a bolt 76 with the finger housing 70 and the spacing bushing 75 therebetween. So it moves with the housing 70.

The nut part (part shown by A) of a jack is integrally formed in this fixing plate.

The expansion rod 53 is composed of an expansion pipe 53-1, an expansion pipe 53-2, an expansion bushing 53-3, and an expansion tube 53-4. One end of the expansion rod is screwed to the fixing plate and the other end is a head having a diameter larger than the inner diameter of the expansion sleeve and the expansion bushing. The head has a streamlined conical shape for easy insertion into the thimble tube.

The expansion tube 53-2, the expansion bushing 53-3, and the expansion tube 53-4 are installed to be fitted by the expansion rod, and the expansion tube 53-4 is coupled to the moving plate at an upper portion thereof. Then, a plurality of expansion sleeves 53-2 and expansion pipe bushings 53-3 are alternately installed, and each of the expansion pipes 53-2 and the expansion pipe bushing 53-3 is in contact with each other and fitted to each other at end portions inclined to each other.

These expansion sleeves 53-2 and expansion bushings 53-3 are enlarged sleeves 53-2 and expansion bushings 53-3 because the expansion rod 53-1 is fixed to the fixed plate when the movable plate is moved downward. ), While the inclined surfaces slide slightly from each other while receiving a compressive force in the longitudinal direction by the expansion pipe, the expansion pipe is pushed outward so as to be in close contact with the inside of the thimble tube.

Since the strength of the thimble tube is limited and the expansion tube expands too strongly therein, the thimble tube itself may be broken, and thus, the expansion rod 53-1 and the expansion sleeve 53-2 of the expansion rod 53 may occur. ), The expansion bushing 53-3, and the expansion tube 53-4 should be unique. That is, when the expansion tube 53-1 and the expansion tube 53-4 are compressed on both sides and the expansion sleeves are in an expanded state, the expansion tube 53-1 and the expansion tube 53-4 should be configured to achieve surface contact with the inner surface of the thimble tube.

FIG. 15 is an enlarged view of the portion denoted by B in FIG.

The expansion sleeves and expansion bushings are roughly shaped as shown in order to expand the expansion sleeves in surface contact with the inner surface of the thimble tube. The contact area between the expansion sleeve and the expansion bushing, the expansion rod and the expansion tube has a gentle slope.

The expansion tube 53-2 is cut at predetermined intervals from the end portion to the center portion as shown in Fig. 16-A. Thus, when the expansion sleeve is expanded by being combined with the expansion bushing 53-3, the expansion tube 53-4, or the expansion rod, as shown in FIG. 16-b.

As shown in FIG. 17, the expansion sleeve material is compressed by pressing the expansion sleeve material cut with the expansion bushing so that the contact area is enlarged. Revert to the end so that the end is inclined. This cutting operation is repeated several times, so that the surface contact can be made more secure.

In order to expand or contract the expansion sleeve, the fixed plate and the moving plate are relatively moved.

The jack is connected to the lower expansion shaft 80-1 connected to the control panel to move the moving plate downward and to move it upward. When the lower expansion shaft rotates, the jack moves the fixed plate and the moving plate to each other. Occurs. The jack has a nut portion 89 attached to the fixing plate 57, and a bolt portion 85 is placed on a collar 84 provided on the moving plate. The lower expansion shaft 80-1 penetrates the collar and the moving plate and is screwed with the nut 81 with the washer 83 therebetween. The nut 81 is coupled to the lower expansion shaft so that the movable plate is positioned at an appropriate position, and then fixed to the lower expansion shaft by a fixing pin 82.

The lower expansion shaft 80 is connected to the upper expansion shaft 80-2 by the expansion shaft connecting pipe 86 (FIG. 10). At this time, of course, the fixing pin 87 is installed so that the upper expansion shaft 80-2 is completely coupled to the expansion shaft connection pipe 86 to which the lower expansion shaft 80-1 is connected.

The upper expansion shaft 80-2 is formed with a hexagonal head 88 for enabling a torque wrench on the top thereof, and the torque clutch and the ratchet for preventing reverse rotation are coupled.

Torque clutch uses a ball clutch composed of a ball and a spring to prevent the torque of a predetermined size or more from being applied to the shaft.

The torque clutch is coupled to the driving plate 91 with the driving plate 91 integrally connected to the upper expansion shaft, with the driving plate 92 interposed therebetween, and the driving plate and the driving plate are provided with a moving passage. The drive plate 92 has a gear formed at the edge thereof and is coupled to the worm mechanism 96. Thus, when the worm gear of the worm mechanism 96 is rotated by the handle, the driving plate is configured to rotate.

In addition, a spring 94, which is adjusted by a constant force by a spring cap 95 and an adjustment nut 97, is installed at the upper portion of the drive plate to push the drive plate toward the driven plate.

This torque clutch rotates the driven plate by rotating the driven plate by the operation of the worm mechanism, and eventually rotates the expansion shaft. When a certain force or more is applied, that is, when the torque for rotating the expansion shaft becomes a certain value, the driving plate and the driven plate As the driving plate jumps and rotates the upper part of the ball, which is being engaged, the rotation of the driven plate is stopped.

A ratchet tooth is formed in the lower part of the driven plate, and the stopper 98 of the ratchet mechanism is coupled to the tooth to engage the ratchet mechanism so that the driven plate rotates only in a certain direction. When the ratchet mechanism is released, the driven plate can be rotated in both directions.

The upper expansion shaft 80-2, the worm mechanism 96, the torque clutch, and the ratchet mechanism are supported by the frame.

The frame has a lifting lug 101, a mounting block 102, a support pipe 75, a worm mechanism support plate 103, and the like.

The upper expansion shaft 80-2, the worm mechanism 96, the torque clutch, the ratchet mechanisms, the lifting lugs 101 of the frame, the mounting block 102, the support pipe 75, Coupling with the worm mechanism support plate 103 or the like is coupled with a bearing, pin, bolt, nut, and the like.

The operation of the sleeve expansion device having such a configuration is as follows.

When the drive plate is rotated by turning the handle of the worm mechanism, the driven plate rotates until a constant torque, which causes the lower expansion shaft to rotate, and the jack bolt of the jack mechanism rotates to move the moving plate on the lower side with respect to the fixed plate. Let's do it. Then, the expansion tube 53-4 coupled to the moving plate moves downward, and the expansion rod 53-1 remains at the position so that the expansion tube 53-2 and the expansion bushing 53-3 and The expansion tube 53-4 is squeezed by sliding on the inclined surface with each other, so that the expansion tube is expanded to the outside to expand and engage in the thimble tube.

This disengagement is done by disengaging the ratchet mechanism and rotating the worm gear in reverse. In other words, if the expansion shaft is rotated in reverse, the distance between the fixed plate and the moving plate is reduced and the expanded sleeve is reduced, and the coupling with the thimble tube is terminated.

The following describes an alignment device to allow the fuel assembly to engage in the correct position on the top assembly of the fuel assembly.

The alignment device is for guiding the fuel handling device to the correct position prior to engagement with the fuel assembly.

The alignment device includes a guide pin 111, an auxiliary pin 112, a guide plate 118, a stop lug 113, a guide rod 115, a guide spring 116, a spring housing 114 and the like.

Referring to FIGS. 5 and 10, in FIG. 5, the spring is compressed and the alignment mechanism is compressed to show an operating state. In the non-combined state with the fuel assembly, the guide pin 111 is lower than the bottom of the expansion pipe. This is in a down state.

The guide pin 111 is guided to the guide hole 16 formed in the upper stationary body of the fuel assembly to position the handling device. The guide pins 111 are provided at two corners of the guide plate 118. Auxiliary pins are installed at one location, and stop lugs are installed at four corners. The guide rods 115 extending to the upper portions of the two guide pins 111 are connected to each other, and the guide springs 116 are positioned on the upper portions thereof, and the guide springs and the guide rods are installed in the spring housing 114. The spring housing 114 is installed at two locations integrally with the fixed plate 56, and the guide rod 115 and the guide spring 116 are installed at two corresponding portions of the spring housing at the guide plate 118. The guide plate is provided with holes through which the expansion pipe passes, and the head 53-1 of the expansion pipe rod of the expansion pipe is normally installed so as to descend under the guide plate.

The alignment mechanism thus configured is pushed down by the guide spring and lowered due to its own load before the device is combined with the fuel assembly, and when the device approaches the fuel assembly, the guide pin 111 is first It is inserted into the guide hole 16 of the stagnation begins to be inserted and then the auxiliary pins are also inserted. When the guide pin 111 and the auxiliary pin 112 are all inserted, the stop lug 113 is in contact with the upper fixing body and the guide pin is not inserted anymore, and the guide rod is integrally coupled with the guide plate 118. 115 is pushed up while pushing the guide spring into the spring housing, and the guide plate is pushed up as well. At this time, the expansion rod begins to be inserted into the fuel tube's thimble tube, the guide plate is pushed up to the end, and moves to the position where it is no longer pushed in contact with the bolt 76 coupled to the fixed plate, and the expansion rod is inserted into the thimble tube of the fuel assembly. Deeply inserted.

As the device disengages and rises with the fuel assembly, the guide rod is pushed onto the guide spring and moves down until it reaches its initial position due to its own load. At this time, the expansion tube also exits within the thimble tube of the fuel assembly.

The overall operation of the device is as follows.

First, the device is moved to the upper part of the nuclear fuel assembly to be moved by the crane, and then slowly lowers the device as a crane to approach the nuclear fuel assembly, the guide pin 111 is first guided to the guide hole 16 of the upper stationary body. Inserted and the auxiliary pin is also inserted, the stop lug 113 is in contact with the upper surface of the upper fixing body and the guide plate 118 is moved, the expansion rod is inserted into the thimble tube of the nuclear fuel assembly, the alignment operation is pushed up to the end Is done.

In this arrangement, when the finger handle of the finger driving device is lowered from the upper position to the lower position, the fingers are opened and inserted into the finger holes of the upper fixing body to be coupled with the upper fixing body of the fuel assembly.

That is, if the finger handle located at the top is removed from the upper hole of the support pipe and moved downward, the finger drive connecting pipe is moved downward and the finger actuator 58 is pushed down to push the fingers outward so It is coupled to the finger hole of the fixture.

Next, if the drive plate is rotated by turning the handle of the worm mechanism, the driven plate is rotated until a constant torque, which causes the lower expansion shaft to be rotated and the jack bolt of the jack mechanism is rotated to lower the moving plate on the lower side of the fixed plate. Move to Then, the expansion tube 53-4, which is coupled to the moving plate, moves downward, and the expansion rod 53-1 remains in its position, so the expansion tube 53-2 and the expansion bushing 53-3 and The expansion tube 53-4 is squeezed by sliding on the inclined surface with each other, so that the expansion tube is expanded to the outside to expand and engage in the thimble tube.

When the coupling is completed in this way, the crane and the fuel are moved to a predetermined location using a crane, and the device is operated in reverse to terminate the coupling with the fuel assembly.

That is, by disengaging the ratchet mechanism to allow the expansion shaft to rotate in reverse, turn the handle of the worm mechanism to reverse the expansion shaft, and move the movable plate upwards with respect to the fixed plate so that the expansion tube moves inward. The diameter is reduced to allow for shrinkage in the thimble tube.

After this, the finger handle of the finger drive device is lifted and fixed from the lower position to the upper position to pinch the fingers out of the finger hole of the upper fixture and separate from the upper fixture of the fuel assembly.

Subsequently, using a crane, pull out and lift up the expansion rods inserted in the upper part of the nuclear fuel assembly, it is pulled out to the final edge guide pin and the coupling is completely terminated. After that, proceed as described first for the next operation.

A detailed procedure of using the apparatus will be described as an example.

[CALIBRATION PROCEDURE]

1. After use, install a 2,000 kg scale on the fuel reservoir crane hoist and install the tool on the hook of the scale.

2. The expansion sleeve drive torque clutch spring tension must be adjusted on the dummy fuel body before lifting the spent fuel assembly.

[Tension adjustment method]

(A) Move the hoist to center the tool with the simulated fuel cell for the test.

(B) Watch the load change of scale and lower hoist at low speed.

(C) Lower the hoist until the bottom of the tool is in contact with the upper part of the test fuel body, and check that the operation of the various alignment devices and shock absorbers is smooth.

(D) Lower the finger operation handle to the finger tightening position and fasten it with the fuel body.

(E) Turn the worm shaft handle clockwise to extend the expansion sleeve and engage it with the fuel body.

(F) Lift hoist until the load indicated on the balance is 784 kg.

If (G) and (F) are satisfied, observe the load fluctuation for 5 minutes and check if the watershed between STATIONARY PLATE and MOVABLE EXPANDING PLATE occurs.

(If there is play, slippage occurs on the mating surfaces of the expansion sleeve and the dummy fuel guide thimble tube, and the tension must be adjusted again.)

If the items (a) and (g) are satisfied, turn the torque clutch and adjust the fixing nut little by little until the upper extension rod turns along.

(I) Turn the torque clutch counterclockwise to fully retract the expansion sleeve.

(T) After adjusting the torque, remove the torque wrench and use the worm shaft handle to turn it clockwise until the torque bowl is over.

(K) When the hoist is lifted and the scale indicates 784㎏, hold for 5 minutes and confirm that it is satisfied.

[Operation Procedure]

1. After use, centering the fuel body and inserting guide pins and reference pins, and carefully observing the fingers and the extension rods for smooth fuel and fastening process.

2. Lower until the scale indicates zero.

3. Check that the tightening condition is satisfied by tightening the tool and fuel body with the finger in the tightening position.

4. Turn the worm shaft handle clockwise to tighten the torque clutch until it is over the torque bowl.

5. Lift the hoist about 10 cm and the scale needle reads the indicator. Tool weight (240㎏) + spent fuel assembly weight (540㎏) = 744㎏

6. If paragraph 6 is satisfied, check that the expansion unit and the spent fuel assembly guide thimble tube slip.

7. Continue moving hoist and centering it in the storage rack until the spring scale indicates zero.

8. Relax ratchet under TOP EXPANDING SHAFT.

9. Loosen the expansion sleeve by turning the worm shaft handle of the tool counterclockwise. At this time, if loosened by excessive force is required to force the next expansion sleeve device fastening. Therefore, it is necessary to indicate how much the worm clutch rotates when the expansion sleeve device is tightened.

10. Lift the finger manipulator of the tool up and away from the fuel body.

11. Lift the hoist and check that the scale is equal to the tool weight.

12. Repeat the above series of operation methods.

As described above, when the fuel is transported by using the fuel handling device, an accident in which the upper stationary body of the fuel assembly and the fuel are separated can be prevented in advance, so that safe work can be performed.

Claims (13)

Finger drive device coupled to the fuel assembly using a finger hole formed in the top fixture of the fuel assembly for use in transporting a plurality of thimbles and a top fixture which bundles the tops of the thimble tubes. And, a sleeve expansion device inserted into the thimble tube and more firmly coupled to the fuel assembly, and a frame for supporting the finger driving device and the sleeve expansion device, wherein the sleeve expansion device includes a plurality of expansion pipes. And a fixing plate 57 and a dion plate 56 which are connected to the expansion tube 53 and expand or contract, respectively, and the expansion tube 53 includes an expansion tube 53-1 and an expansion tube sleeve. (53-2), expansion tube (53-3), and expansion tube (53-4), one end of the expansion rod is screwed to the fixing plate and the other end of the expansion sleeve It has a head having a diameter larger than the inner diameter of the expansion bushing, the expansion sleeve (53-2), expansion pipe bushing 53-3, and expansion tube (53-4) is fitted by the expansion pipe rod, In the upper part, the expansion tube 53-4 is coupled to the moving plate, and then, a plurality of expansion tube 53-2 and expansion tube bushing 53-3 are alternately installed, and each of them is in contact with each other at the end inclined to each other. Nuclear fuel handling device The method of claim 1, wherein the expansion rod 53-1, the expansion sleeve 53-2, the expansion bushing 53-3, and the expansion tube 53-4 of the expansion tube 53 have a shape of mutual contact. Nuclear fuel handling device characterized in that the expansion sleeves are expanded when pressed on both sides to make a surface contact to the inner surface of the thimble tube 3. The nuclear fuel handling device according to claim 2, wherein the expansion sleeve has a gentle inclined surface in contact with the expansion bushing, the expansion rod, and the expansion tube, and is cut at predetermined intervals from its end portion to the center portion. The nuclear fuel handling device according to claim 1, wherein a jack for moving the movable plate up and down is coupled between the fixed plate and the movable plate. 5. The jack of claim 4, wherein the jack has a nut portion (89) attached to a fixed plate (70), and a bolt portion (85) is positioned on a collar (84) mounted on a moving plate, wherein the bolt portion is underswelled. It is integrated with the shaft 80-1, the lower expansion shaft penetrates the collar and the moving plate, characterized in that the nuclear fuel handling device is screwed with the nut 81 with the washer 83 therebetween. The worm mechanism according to claim 5, wherein the lower expansion shaft (80) is connected to the upper expansion shaft (80-2) by the expansion shaft connecting pipe (86), and the worm mechanism for providing rotational force to the upper expansion shaft (80-2). Fuel handling device characterized in that is coupled via a torque clutch 7. A nuclear fuel handling device according to claim 6, wherein the torque clutch uses a ball clutch with fire and spring to prevent the torque of a predetermined size or more from being applied to the shaft. 7. The nuclear fuel handling device of claim 6, wherein a ratchet mechanism is coupled to the upper expansion shaft to prevent reverse rotation. 7. The torque clutch of claim 6, wherein the torque clutch is coupled to a driving plate (91) interposed between the driving plate (91) integrally connected to the upper expansion shaft. The drive plate 92 has a gear formed at an edge thereof and is coupled to the worm mechanism 96. The drive plate rotates when the worm gear of the worm mechanism 96 is rotated by a handle. Nuclear fuel handling device, characterized in that the spring 94 is adjusted by a constant force by the spring cap 95 and the adjustment nut 97 is installed to push the drive plate toward the driven plate 10. The ratchet mechanism of claim 9, wherein the ratchet tooth is formed at a lower portion of the driven plate, and when the stopper 98 of the ratchet mechanism is engaged, the driven plate rotates only in a predetermined direction. Disengage the nuclear fuel handling device characterized in that the rotation of the driven plate is possible in both directions. The fuel cell assembly of claim 1, further comprising an alignment device for coupling the finger driving device and the sleeve expansion device to the top fixing body of the nuclear fuel assembly in position, wherein the finger driving device is formed on the top fixing body 14. Four fingers 51 to be coupled to the finger holes 17 are connected to the housing 70 of the frame by pins 52, and the fingers 51 are bent at right angles to be inserted into the finger holes. , The nuclear fuel handling device is connected to the housing by a pin (52), the finger actuator (58) is installed to be movable up and down in the housing and is integrally connected to the finger actuator connection pipe (59). According to claim 1, Two guide pins 111 are installed in two corner portions of the guide plate 118, an auxiliary pin is installed in one corner, the stop lugs are installed in four corner portions, the guide rod Is extended to the top of the two guide pins 111, the guide spring 116 is installed in the spring housing 114 on the extended guide rod 115, the spring housing 114 is fixed to the fixing plate 56 Nuclear fuel handling device characterized in that it is installed integrally, the guide plate is formed with holes through which the expansion pipe passes, and the head 53-1 of the expansion rod of the expansion rod is usually installed under the guide plate. A fuel handling device for use in transporting a fuel assembly having a plurality of thimbles and a top fixture that bundles the tops of the thimbles, wherein the fingerholes are formed in the top assembly of the fuel assembly to the fuel assembly. A nuclear fuel handling device comprising: a finger drive device coupled to the sleeve tube; a sleeve expansion device inserted into the thimble tube and more firmly coupled to the fuel assembly; and a frame for supporting the finger drive device and the sleeve expansion device. A method of manufacturing an expansion sleeve of an expansion device, comprising (1) compressing an expansion sleeve material cut at one or more points by a constant length in the longitudinal direction with an inclined expansion bushing at both ends and (2) Afterwards, the portion protruding from the predetermined diameter is scraped off, and the pressing state is relaxed. (1) and (2) a sleeve tube-expanding method for manufacturing of the fuel handling equipment is characterized by conducting repeatedly at least once.