JPH0636064B2 - Assembling device for nuclear fuel assemblies - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Technical Field of the Invention The present invention relates to a nuclear fuel assembly assembling apparatus, and more particularly to a nuclear fuel assembly assembling apparatus for improving efficiency and reducing exposure dose.

(Prior Art) Generally, in a nuclear fuel assembly for a nuclear reactor, fuel rod spacers are provided at a plurality of positions in the longitudinal direction so as to hold a plurality of fuel rods at intervals.

That is, FIG. 7 is a vertical cross-sectional view of the nuclear fuel assembly 1 for a nuclear reactor, in which a plurality of fuel rods 4 and water rods whose upper and lower ends are supported by an upper tie plate 2 and a lower tie plate 3, respectively. 5 are installed in an array,
Further, a plurality of spacers 6 are provided in the axial direction of the fuel rods 4 for supporting the fuel rods 4 in an aligned manner, restraining lateral vibrations of the fuel rods 4 and ensuring a flow path of the coolant. By the way, in this example of the nuclear fuel assembly, the upper and lower tie plates are fixed by eight combined fuel rods 7, and the lower end plugs of the combined fuel rods 7 are screwed into the lower tie plate 3 to form the combined fuel. The lower part of the rod 7 is connected and fixed to the lower tie plate 3, and the upper end plug 8 of the combined fuel rod 7 is inserted into the upper tie plate 2 and fixed with a nut so that the upper part of the combined fuel rod 7 becomes the upper tie plate 2. The fuel rods 4 are connected and fixed, and each fuel rod 4 is pressed and fixed downward by a spring 9 to fix all the fuel rods.

Therefore, when assembling the nuclear fuel assembly, as shown in FIG. 8, the lower tie plate 3 and the spacer 6 are fixed to predetermined positions on the base 10 of the assembling apparatus, and the water rod 5 is first fixed to the predetermined position of the spacer 6. Push it into the cell, and then screw the eight combined fuel rods 7 into the lower tie plate 3 (FIG. 9 (B)) so that the insertion surface of the lower tie plate 3 and the axial direction of the fuel rod are at right angles. After that, the other fuel rods 4 are sequentially inserted. After inserting all the fuel rods,
I was wearing an upper tie plate. 10 (A) and 10 (B) are views showing a lower tie plate fixing jig in the prior art, in which a lower tie plate fixing frame 12 and a taper supporting portion 13 are provided on a base 11 with a handle 14 and a screw 1.
5 is attached so as to be movable in the axial direction of the fuel rod. The fixed frame 12 includes a first arm 18 attached to a base rod 16 mounted on the base 11 so as to be movable in the fuel rod axial direction so as to be swingable about a horizontal pin 17, and a first arm 18.
A second arm 20 is attached to the top of the arm 18 by a bolt 19 so as to be rotatable in a horizontal plane, and a third arm is attached to the other end of the base rod 16 so as to be swingable around a horizontal pin 21. It is constituted by an arm 22, and the tip of the second arm 20 is fixed to the top of the third arm 22 with a fixing screw 2
A frame body is formed by connecting the base rods 3 with each other.
The pushing rod 2 attached to the upper base 24, the inner surfaces of the first and third arms 18 and 22, and the second arm 20.
5, the lower tie plate is clamped and fixed in a fixed state. Also, the taper support portion 2
At 0, a cylindrical taper portion receiver 26 for receiving the taper portion of the lower tie plate 3 is attached.
The taper portion of the lower tie plate 3 is engaged with the taper surface formed on the inner peripheral surface of the tip end of 6, and the taper support portion 13 restrains the lower tie plate 3 in the right direction in FIG. . Further, as shown in FIG. 8, a spacer fixing jig 27 is mounted on the base 10 at a position corresponding to the spacer of the fuel assembly, and the spacer fixing jig is a lower type shown in FIG. The rate fixing jig is the same as the rate fixing jig except the taper support portion 13.

Then, after the assembly of the fuel assembly is completed, as shown in FIG.
After hooking the hook 31 of the crane on the huddle, the fixing screws 23 of the fixing frame 12 of the spacer and the lower tie plate are loosened, and the two arms are opened to release the fixed state of the spacer and the lower tie plate. After this, the crane hook 31
Is moved in the direction of the arrow, the lower tie plate 3 is smoothly detached from the taper portion receiver 26, and the fuel assembly is detached from the assembly table.

(Problems to be solved by the invention) However, in the assembly by the conventional method, first, it is necessary to insert from the combined fuel rods and to make a right angle between the lower tie plate insertion surface and the axial direction of the fuel rods. There are problems such as being troublesome and inefficient.

Further, it is possible to move the fuel assembly while manually operating the crane as shown in FIG. 11 by supporting it with a hand under the fuel assembly, but it is complicated such as performing an inching operation. However, there is a problem that the next assembly work of the fuel assembly cannot be started unless the worker moves and stores it in the fuel assembly storage by the crane. Also,
Although there is no problem with the current exposure dose, there is a problem that the conventional method cannot cope with it when transfer thermal automation etc. is required in the future when automatic transfer is required.

In view of the above points, a first object of the present invention is to provide an efficient nuclear fuel assembly assembling apparatus.

A second object of the present invention is to provide a nuclear fuel assembly assembling apparatus in which the fuel rod mounting surface of the lower tie plate and the fuel rod form a right angle accurately regardless of the fuel rod insertion order.

[Structure of Invention]

(Means for Solving the Problems) In the present invention, the fuel rods are inserted into the spacer cells arranged in a lattice shape or a honeycomb shape to keep the distance between the fuel rods. In a nuclear fuel assembly assembling device in which the upper and lower parts of the fuel rods are held by a rate, a base having approximately the same length as the fuel assembly is installed so that the axial direction of the fuel rods of the fuel assembly stands from the horizontal direction to the vertical direction. A lower tie plate frame fixing device that is rotatably mounted so that it can be raised and holds and holds the lower tie plate frame surface at the fuel rod insertion end position on the base, and the fuel rod axial direction on the base. A jig that engages with the fixed surface of the lower tie plate is slidably mounted on a support plate that is erected vertically with respect to the axis of the fuel rod, and the lower tie plate is attached to the jig. Attract in the direction It is characterized in that a lower tie plate fixing mechanism having a fuel rod attachment surface angle holding mechanism having an index member attached thereto is attached.

Thus, when assembling the nuclear fuel assembly, the lower tie plate is held by the lower tie plate frame surface fixing device, and the lower tie plate is attracted by the index member in the direction of the jig attached to the support plate. The fixing surface formed on the rate engages with the tip edge of the jig, and the fuel rod mounting surface of the lower tie plate is adjusted and held so that it is always perpendicular to the fuel rod axis.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

In FIG. 1, reference numeral 100 is a nuclear fuel assembly assembling apparatus, and a nuclear fuel assembly intermediate transfer mechanism 200 is provided on one side thereof.
Is provided side by side so that the nuclear fuel assembly can be delivered from the assembling apparatus 100 to the intermediate transfer mechanism immediately after the completion of the nuclear fuel rigid body assembly.

A base 102 having substantially the same length as the nuclear fuel assembly 1 is mounted on a frame 101 of the nuclear fuel assembly assembling apparatus 100 so as to be swingable about a horizontal axis 103. The tip of a piston rod 105 of a hydraulic cylinder 104 is connected to one end of the base 102, and the base end of the hydraulic cylinder 104 is pivotally attached to the pedestal 101 to operate the hydraulic cylinder 104 to move the piston rod 105. By moving in the retracting direction, the base 102 can be moved from the horizontal position shown by the solid line in FIG. 1 to the vertical position shown by the two-dot chain line.

On the base 102, a plurality of spacer fixing mechanisms 106 and a lower tie plate fixing mechanism 107 for fixing the spacers of the nuclear fuel assembly at predetermined intervals in the axial direction are mounted.

2A and 2B show the spacer fixing mechanism 10 described above.
6 is a front view and a side view of FIG. 6, in which a base 112 of the spacer fixing mechanism 106 is mounted on a support plate 111 fixed to the base 102 and having a dovetail groove 110 in the longitudinal direction. An engagement protrusion 113 provided on the bottom surface of the support plate 112 is engaged with the dovetail groove 110 of the support plate 111, and the base 112 thereof can be moved and adjusted along the dovetail groove 110 to some extent.

A lower end of an I-shaped arm 115 is pivotally attached to one side of the base 112 by a support shaft 114 parallel to the dovetail 110, and the other side of the base 112 is sandwiched by the dovetail 110. A base end of an inverted L-shaped L-shaped arm 116 is pivotally attached by a support shaft 117. Gears 118 and 119 are rotatably mounted on the support shafts 114 and 117, respectively, and the gears 118 and 119 mesh with each other.
Two intermediate gears 120 and 121 are interlocked with each other. Then, one of the above two intermediate gears 12
1 is meshed with a spline shaft 122 extending through the base 121 in the longitudinal direction of the base 102,
The intermediate gear 121 is rotationally driven via the spline shaft 122. Therefore, the entire spacer fixing mechanism 106 can be finely moved along the fuel rod insertion direction (longitudinal direction of the base 102).

The gears 118 and 119 have arcuate grooves 118a,
119b are respectively formed in the grooves 118a, 118a,
119a to I-shaped arm 115 and L-shaped arm 1
Pins 123 and 124 drilled in 16 are respectively projected, and the pins 123 and 124 and both gears 118 and 1 are projected.
Tension springs 127 and 128 are respectively stretched between the pins 125 and 126 projecting from the pin 19, and the tension springs 127 and 128 respectively maintain the I-shaped arm 115 and the L-shaped arm 116 in the upright state. Is urged by.

An air cylinder 129 is attached to the outside of the I-shaped arm 115, and a wedge 131 is integrally formed at the top end of the piston rod 130 of the air cylinder 129.

By the way, the tip portion of the L-shaped arm 116 is placed on the top end surface of the I-shaped arm 115 when it is upright,
At that time, the wedge 131 engages with the notch 132 formed at the tip of the L-shaped arm 116, and both arms 115, 1
16 are connected and secured to each other. Therefore, when the air cylinder 129 is operated to extend the piston rod 130, the wedge 131 and the L-shaped arm 116 are disengaged from each other, and the secured state is released.

Then, after the wedge 131 and the L-shaped arm 116 are disengaged from each other as described above, the spline shaft 122 is moved to the position shown in FIG.
When it is rotated clockwise in, the gear 119 is rotated counterclockwise through the intermediate gear 121, and the L-shaped arm 1 is rotated.
16 is rotated counterclockwise, and at the same time, the I-shaped arm 115
3 is also rotated clockwise through the intermediate gears 120 and 118, as shown in FIG. 3, and the restrained state of the nuclear fuel assembly can be released.

Restraint plates 133a and 133b are fixed to the upper surface of the base plate 112 and the inner surface of the I-shaped arm 115, respectively, while restraint plates 133c are attached to the inner surface of the leg portion and the bent piece portion of the L-shaped arm 116, respectively. , 133d are mounted.

The constraining plates 133c and 133d are both compression springs 134.
Are urged so as to project inward, and projecting rods 135 rotatably projecting from the restraint plates 133c and 133d penetrate the L-shaped arm 116, respectively.
A rectangular stopper / knob 136 is formed at the tip of 5. Therefore, the stopper / knob 136 described above is used.
Pulls the thrust rod 135 against the compression spring 134,
When rotated by 90 ° so that both ends of the stopper / knob 136 are placed on the projection 137 also serving as the lid of the compression spring 134, both the restraint plates 133c and 133d are in the retracted position and formed by the four restraint plates. The frame to be inserted becomes large, and the spacer insertion device can be easily performed.
Further, when the stopper / knob 136 is rotated in the opposite direction from the above state and the engagement between the knob 136 and the projection 137 is released, the compression spring 134 causes the restraint plates 133c, 1
33d are respectively moved inward, and the constraining plates 133c,
Since 133d is in a state of pressing the spacer frame surface, the spacer can be fixed easily and quickly.

In addition, on the side opposite to the fuel rod insertion side of the I-shaped arm 115 and the L-shaped arm 116, the protrusion 13 that engages with the spacer frame.
A stopper 139 having 8 is mounted.

On the other hand, FIG. 4 is a view showing the details of the lower tie plate fixing mechanism 107, and is exactly the same as the spacer fixing mechanism 106 on the support plate 140 fixed to the fuel rod insertion terminal device on the base 102. A lower tie plate frame surface fixing device 141 which has a mechanism and restrains the lower tie plate frame surface 3a in a direction perpendicular to the fuel rod axial direction is mounted.

The lower tie plate holding jig support plate 14 is provided on the side opposite to the fuel rod insertion side of the lower tie plate frame surface fixing device 141.
2 is erected on the support plate 140, and on the support plate 12, a triple bridge of the lower tie plate 3 mounted on the lower tie plate frame surface fixing device 141 is moved back and forth by an air cylinder 143. An air chuck 145 having a hand 144 for gripping 3b on the front surface is attached. On the surface of the support plate 142 facing the lower tie plate frame surface fixing device 141, a first support ring 147 which is slidable only in the left-right direction through the linear guide 14 is attached. The first support ring 147 is further provided with a second support ring 149 which is slidable only in the vertical direction through the linear guide 148 to some extent, and a lower tie plate is attached to the front surface of the second support ring 149. A holding jig 150 for holding the fuel rod mounting surface 3c of No. 3 so as to be perpendicular to the fuel rod is fixed. The holding jig 150 is formed in a cylindrical shape, and its front end face is located in a plane orthogonal to the fuel rod insertion direction, and the fuel is formed by notching in the corner portion of the lower tie plate 3. It is adapted to engage with a fixed surface 3d (FIG. 9 (A)) parallel to the rod mounting surface 3c.

A lower tie plate fixing mechanism including the lower tie plate frame surface fixing device 141 and a fuel rod mounting surface angle holding mechanism in which a jig 150, an air chuck 145 and the like are provided on the lower tie plate holding jig support plate 142. The fine movement position of 107 can be adjusted by a screw shaft 152 having a handle 151 in the fuel rod axial direction.

Then, when assembling the nuclear fuel assembly, a predetermined number of spacer fixing mechanisms 106 and lower tie plate fixing mechanisms 107 are set and fixed at predetermined positions on the base 102, and the constraining plates 133c and 133d of each spacer fixing mechanism 106 are fixed. The four stopper plates 133a, 133b, 133c, 133 are moved to the retracted position by the stopper / knob 136.
The frame formed by d is enlarged, spacers are inserted into the frame, and the position is regulated by the stopper 139. Then, after that, the knob 136 is rotated to move the restraint plates 133c, 133d inward by the compression springs 134, and the restraint plates 133a, 133b, 133 are moved.
The spacer is restrained and held by c and 133d.

On the other hand, also in the lower tie plate fixing mechanism 107, first, the lower tie plate 3 is inserted into each constraining plate of the lower tie plate frame surface fixing device 141, and then the air chuck 145.
The handle 144 is engaged with the triple bridge 3b of the lower tie plate 3 and the air cylinder 143 is operated to drive the air chuck 145 to be pulled. Therefore, the lower tie plate 3 is pulled to the right in FIG. 4, the fixing surface 3d of the lower tie plate 3 engages with the front end surface of the jig 150, and the fuel rod mounting surface 3c of the lower tie plate 3 becomes the fuel. The restraining plates 133a, 13 are held so as to be at right angles to the rods.
The fixing is performed by 3b, 133c and 133d. That is, when the lower tie plate 3 is pulled by the air chuck 145 and comes into contact with the jig 150, the jig 150 moves vertically and horizontally through the linear guides 146 and 148 to be parallel to the fuel rod mounting surface 3c. Accurately engages with the fixed surface 3d provided on the fuel rod mounting surface 3c, so that the fuel rod mounting surface 3c becomes a right angle to the fuel rod insertion direction.

Therefore, the fuel rods are sequentially inserted into the cells of each spacer, the tips of the fuel rods are mounted on the fuel rod mounting surface 3c of the lower tie plate 3, and finally the upper tie plate is mounted to assemble the fuel assembly. You can

When the assembly of the fuel assembly is completed in this way, the base 102
Is swung about the horizontal axis 103 at the vertical position shown by the chain double-dashed line in FIG. 1, and the fuel assembly is held in the upright state. Therefore, after the engagement between the wedge 131 and the L-shaped arm 116 is released, the spline shaft 122 is appropriately rotated by the drive mechanism, and each spacer fixing mechanism 106, the I-shaped arms 115 and L of the lower tie plate fixing mechanism 107. The shaped arm 116 is expanded as shown in FIG. 3 to release the restraint of the spacer and lower tie plate by each restraint plate,
The fuel assembly can be taken out.

Thus, in the above embodiment, the lower tie plate 3
Is fixed by pulling the triple bridge 3d with the air chuck 145 by abutting the tip edge of the jig 150 to the fixing surface 3d parallel to the fuel rod mounting surface 3c, and thus lowering the lower type by only the pulling action of the air chuck 145. Rate can be fixed so that the fuel rod mounting surface is at right angles to the axial direction of the fuel rods, accuracy is improved, and there are no restrictions such as the need to insert the combined fuel rods first during assembly, and the assembly work is extremely easy. Can be done

Furthermore, since the jig 150 can be adjusted vertically and horizontally by the linear guides 146 and 148, the fixing surface 3d of the lower tie plate and the front end surface of the jig 150 are automatically and reliably engaged.

Moreover, the constraining plates 133c and 133d for fixedly constraining the side surfaces of the spacer and the lower tie plate are provided with the L-shaped arm 1 by the rotatable projecting rod 135 and the compression spring 134.
Since it is attached to the rod 16,
The spacer or the lower tie plate can be restrained only by rotating 5, so that they can be attached to the fixing mechanism very easily and the efficiency can be improved. Moreover, since the spacer fixing mechanism 106 and the lower tie plate fixing mechanism 107 are opened / closed by the single spline shaft 112, preparation for assembly and removal of the assembled nuclear fuel assembly can be performed very easily.

By the way, if the operation of releasing the restraint state of the fuel assembly is performed in a state where the nuclear fuel assembly is erected vertically and the upper tie plate is not hooked by the crane or transfer mechanism, the fuel assembly is dropped. It may cause an accident. Therefore, it is preferable that the actuator for driving the spline shaft 122 is mounted on a crane or a transfer mechanism so that the spline shaft 122 cannot be physically driven unless the upper tie plate is hooked with the actuator. In addition, it is preferable in terms of efficiency that the nuclear fuel assembly can be transferred immediately after the assembly, and then the next nuclear fuel assembly can be immediately assembled.

Therefore, as shown in FIG. 1, a nuclear fuel assembly assembling apparatus 1
The intermediate transfer device 200 is provided in the vicinity of 00.

That is, in the vicinity of one end of the base 102, a column 201 is erected vertically from the floor so as to face the nuclear fuel assembly in an upright state, and a sleeve 202 is concentric with the column 201. Is fitted to the outside. A bearing 203 is provided between the sleeve 202 and the column 201.
And the sleeve 202 has the bearing 2
It is configured so as to be rotatable around the support column 201 via 03. A gear 204 is concentrically fixed to the top of the column 201, and a gear 206 that is driven to rotate by a motor 205 is meshed with the gear 204. It is attached to the drive mechanism holding frame 207 that is fixed to the.

An arm 208 is provided so as to project from the drive mechanism holding frame 207, and a shaft drive actuator 212 including a motor 209, a torque limiter 210, and a coupling 211 is vertically movable at the tip of the arm 208. Is attached to.

Gripping devices 213 and 214 for respectively gripping the upper tie plate and the lower tie plate of the nuclear fuel assembly in the vertical state are mounted on the sleeve 202 so as to be vertically adjustable.

FIG. 5 is a plan view showing the details of the gripping devices 213 and 214, and a base end portion of a clamp plate 215 in which a guide mechanism 214 is formed vertically on one side of the sleeve 202 and a clamp mechanism is provided at the tip. Is vertically slidably engaged, and a nut member 216 fixed to the base end portion of the clamp plate 215 is screwed onto a ball screw 217 provided upright along the sleeve 202. Clamp plate 2
A notched concave portion 218 opening to one side thereof is provided at the tip end of 15 and is formed in a U-shape in a plan view. On the clamp plate 215, guide rods 219 are provided at two sides adjacent to the opening. Clamps 220 and 221 that can move toward and away from each other are attached along the. The clamps 220 and 221 are respectively driven to rotate by a motor 222 and screwed into ball screws 223 having mutually opposite screws, and the rotation of the ball screws 223 causes the clamps 220 and 221 to move toward and away from each other as described above. I am going to do it.

On the other hand, at the tip portion of the spline shaft 112 of the nuclear fuel assembly assembling apparatus 100, as shown in FIG. 6, when the spline shaft 112 is in the upright state, the spline shaft 112 can engage with the coupling 211. Coupling 2
24 is attached. That is, the spline shaft 1
A second coupling 224 having a recess 224a capable of engaging with the engagement protrusion 211a of the coupling 211 is fitted and inserted at the tip of the second coupling 12, and the second coupling 224 and the spline shaft 112. The protrusion 224b provided on the inner surface of the second coupling 224 and the recess 112a formed on the end surface of the spline shaft 112 are disengaged from each other by a spring 225 interposed between Being energized.

Further, on the side surface of the second coupling 224, the protrusion 22 provided on the inner surface of the second coupling 224.
4b and the concave portion 11 formed on the end surface of the spline shaft 112
An engagement piece 227 is provided which engages with the stopper piece 226 protruding from the base 102 and prevents the rotation thereof when the 2a and 2a are not engaged with each other.

Therefore, as shown in FIG. 1, a nuclear fuel assembly assembling apparatus 1
To transfer the assembled nuclear fuel assembly 1 fixed on 00 to the intermediate transfer mechanism 200, the hydraulic cylinder 104 built in the assembly apparatus 100 is operated to move the base 10
2 is rotated about the horizontal axis 103 to bring the nuclear fuel assembly 1 together with the base 102 into an upright state. After that, the sleeve 202 of the intermediate transfer mechanism 200 is rotated about the support column 201 via the motor 205 and the gears 206 and 204, and the gripping devices 213 and 214 are moved to positions where the upper tie plate and the lower tie plate are gripped, respectively. Let Then, the motor 222 is driven to drive both clamps 220 and 221.
Are moved toward each other, and both clamps 2
The upper tie plate and the lower tie plate are sandwiched by the 20 and 221.

In this way, when the upper tie plate and the lower tie plate of the nuclear fuel assembly are gripped by the gripping devices 213 and 214, respectively, the shaft driving actuator 212 is lowered, and the coupling 211 causes the second coupling 224 to move. The locking piece 227 of the second coupling 224 is released from the stopper piece 226 of the base 102 while being pressed against the spring 225, and the protrusion 211a of the coupling 211 and the recess 224a of the second coupling 224 are formed. Engage with each other, and further, the projection 224b of the second coupling 224 and the spline shaft 11
The second recess 112a is engaged. Therefore, the motor 209
When is started, its rotational force is transmitted to the spline shaft 112 through the coupling 211 and the second coupling 224, and the spacer fixing mechanism 106 and the lower tie plate fixing mechanism 107 are released. Therefore, the nuclear fuel assembly 1 ′ is transferred from the assembly device 100 to the intermediate transfer mechanism 200.
It will be in the state where it was returned to. Therefore, the upper and lower gripping devices 213 and 214 are moved upward along the sleeve 202 so that the lower tie plate 3 is extracted from the jig 150, and then the sleeve 202 is further rotated to make the nuclear fuel assembly 1 ″. At the same time, the base 102 is returned to the original horizontal state, and the next nuclear fuel assembly is immediately assembled.

Since the nuclear fuel assembly assembling device is also equipped with an intermediate transfer mechanism, it is possible to automatically transfer the nuclear fuel assembly directly after the assembly is completed and start the assembly work of the next nuclear fuel assembly. Can be further improved. Moreover, since the jig 150 is slidable in the direction perpendicular to the axial direction of the fuel rod as described above, it is not necessary to position the gripping devices 213 and 214 for intermediate transfer of the nuclear fuel assemblies with high precision, and Since the spline shaft for performing the opening operation of the spacer fixing mechanism or the like needs to be pushed and rotated by the coupling, the interlock mechanism can be secured, and the nuclear fuel assembly can be prevented from dropping due to the abrupt release of the fixing.

In the above embodiment, the linear guide is provided to secure the freedom of the jig 150 in the vertical and horizontal directions. However, it is not always necessary to use the linear guide, and the jig 150 simply swings in the vertical and horizontal directions. You may do it.
Further, although the intermediate transfer mechanism has been described as a device for carrying out transfer by rotating around a support column which is erected from the floor, it is also possible to suspend the support device in a crane shape.

〔The invention's effect〕

As described above, in the present invention, the jig that engages with the fixed surface of the lower tie plate is attached to the support plate that is fixed at the fuel rod insertion end position on the base and is perpendicular to the fuel rod axial direction. In addition, since the lower tie plate fixing mechanism having the member for attracting the lower tie plate in the jig direction is provided, the fuel rod mounting surface of the lower tie plate is attached to the fuel rod shaft by the operation of the lower tie plate attracting member. Can be fixed so that it automatically becomes a right angle to the direction,
Not only can the accuracy be improved, but there is no restriction such as the prior mounting of the combined fuel rod as in the conventional case, and the assembling work can be easily performed. Moreover, since the jig is slidable in the direction perpendicular to the axis of the fuel rod, it is possible to reliably prevent the lower tie plate from being damaged when the assembled nuclear fuel assembly is removed.

[Brief description of drawings]

FIG. 1 is a structural diagram showing the overall configuration of a nuclear fuel assembly assembling apparatus of the present invention, FIG. 2 is a diagram showing a spacer fixing mechanism, and FIG. 2 (A) is a front view thereof and FIG. 2 (B). ) Is a side view thereof, FIG. 3 is an explanatory view showing a released state of the spacer fixing mechanism, FIG. 4 is a partially longitudinal side view of a lower tie plate fixing mechanism, FIG. 5 is a plan view of a gripping device, and FIG. FIG. 7 is an explanatory view of a spline shaft drive mechanism portion, FIG. 7 is a longitudinal sectional view of a nuclear fuel assembly, FIG. 8 is a side view of a conventional nuclear fuel assembly assembling device,
9A and 9B are a plan view and a partially longitudinal side view of the lower tie plate viewed from below, and FIG. 10A and FIG.
(B) is a front view and a side view of a conventional lower tie plate fixing mechanism, and FIG. 11 is a diagram showing a situation where a nuclear fuel assembly after assembly is completed is transferred from a conventional assembling apparatus by a crane. 100 ... Nuclear fuel assembly assembling device, 101 ... Stand, 1
02: base, 106: spacer fixing mechanism, 107: lower tie plate fixing mechanism, 112: base, 115: I-shaped arm, 116: L-shaped arm, 12
2 ... Spline shaft, 131 ... Wedge, 133a, 133b, 133c, 133d ... Restraint plate,
136 ... stopper and knob, 139 ... stopper,
141 ... Lower tie plate frame surface fixing device, 142 ...
Support plate 144, hand, 145, air chuck,
150 ... Holding jig, 200 ... Intermediate transfer device, 201
...... Posts, 202 ...... sleeve, 212 ...... Shaft drive actuators, 213, 214 ...... Grip device.

Claims (1)

[Claims] 1. Fuel rods are inserted into spacer cells arranged in a lattice or honeycomb shape to maintain the distance between the fuel rods. In a nuclear fuel assembly assembling device for holding, a base having substantially the same length as the fuel assembly,
Fuel assembly Fuel rod A lower type that is mounted on a pedestal so that the axial direction of the fuel rod can rise vertically from the horizontal direction, and the lower tie plate frame surface is held and fixed at the fuel rod insertion end position on the base. A rate frame surface fixing device and a jig that engages with the fixing surface of the lower tie plate on a support plate that is erected perpendicularly to the fuel rod axial direction on the above-mentioned base stand in a direction perpendicular to the fuel rod axis. A nuclear fuel assembly characterized by being mounted slidably and equipped with a lower tie plate fixing mechanism having a fuel rod mounting surface angle holding mechanism equipped with an index member for attracting the lower tie plate in the jig direction. Assembly equipment.