JPH0868891A - Grasping tool for connection and its storage rack - Google Patents

Abstract

PURPOSE: To provide a very reliable grasping tool for connection and its storage rack capable of simply and quickly conducting various handling as grasping various handles of grasping object other than fuel by remote control. CONSTITUTION: To the body 24 of a fuel grasping tool 23 for grasping free of releasing the handle of a fuel assembly with a fuel grasping mechanism which is hung free of remote control by a refueling machine running on refueling floor by way of a mast free of extension, provided are connection pins 25a and 25b for connecting the body 22 of a grasping tool 21 for connection and a slit for connection. Also provided is a grasping hook for connection which is connected to the fuel grasping mechanism free of detaching and free of interlock and grasp the handle of grasping free of releasing object such as control rod and the like other than fuel assembly when the body 22 of the grasping tool for connection is connected to the fuel grasping tool 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting grip which is detachably connected to a fuel grip for a refueling machine of a nuclear power plant and which grips a gripping object such as a control rod other than fuel. It relates to a storage rack that handles this.

[0002]

2. Description of the Related Art Generally, a fuel exchange floor of a nuclear power plant is constructed as shown in FIG. 4, and a reactor well pool 2, a dryer / separator pool 3 on the left and right thereof, and a spent fuel pool 4 are arranged on the fuel exchange floor 1. And are arranged.
A reactor pressure vessel 5 is installed at the bottom of the reactor well pool 2, and the outer circumference of the reactor pressure vessel 5 is surrounded by a reactor containment vessel 6.

At the time of regular inspection (fixed inspection), the refueling machine 7 travels on the refueling floor 1 including the above three pools 2 to 4 for refueling work and other service work. It is like this.

The fuel changer 7 is equipped with a fuel gripping tool 8 via, for example, a telescopic mast which is expandable and contractible, and the fuel gripping tool 8 mainly comprises a fuel assembly 9.
Is used to transfer the fuel between the reactor pressure vessel 5 and the spent fuel storage rack 10 in the spent fuel storage pool 4 by running the fuel changer 7, and the other fuel assembly. It is used to transfer and handle a transfer object having the same handle shape as the body 9.

In addition to the fuel assembly 9, there are control rods 11, fuel support fittings 12 and the like as in-reactor equipment that requires handling such as replacement during regular plant inspections. Since the shape of the handle of the body 9 is different, it cannot be gripped by the fuel gripper 8.

For this reason, dedicated gripping tools adapted to the shapes of various handles are replaced with the wire ends of the auxiliary hoists 13 of the fuel changer 7, and the work of replacing these grips is carried out in the plant regular inspection process. It has become a critical work.

[0007]

That is, when the control rod 11 or the fuel support metal fitting 12 is replaced or transferred, a relatively flexible wire terminal tip of the auxiliary hoist 13 has a dedicated gripping tool adapted to various handle shapes. Since various kinds of work are carried out by attaching a grip, most of the work such as positioning and transfer of the gripping tool becomes a manual operation operation by visual confirmation of the worker, spending a lot of time on the work, and requires a skilled worker. . That is, the work is performed by visually confirming an operator with an underwater television camera or the like, or by confirming a display value of an instrument or the like. Further, since the work of attaching or detaching the various gripping tools for exclusive use to the wire of the auxiliary hoist 13 is directly carried out by the worker, the radiation exposure of the worker may increase.

On the other hand, when handling the fuel assembly 9 and the like by the fuel gripper 8, since the fuel gripper 8 is hung on the fuel changer 7 by the mast having sufficient rigidity, the fuel gripper 8 is handled. Since there is little shake and the positioning accuracy is good, a series of handling and transfer operations can be performed by automatic operation by a computer.

Further, the fuel gripper 8 uses various detectors to detect the gripped state and the released state of the fuel handle, the depth in the various pools 2 to 4 at the time of grasping and released, the load state applied to the gripper, and the like. Various interlocks are provided for detection and monitoring.

Therefore, the present invention has been made in consideration of such circumstances, and an object thereof is to easily and quickly perform various handlings such as grasping respective handles of grasp objects other than fuel by remote operation. An object of the present invention is to provide a reliable connecting grip and its storage rack that can be carried out.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a gripper capable of gripping various grips of various gripping objects is connected to a fuel gripper having good alignment accuracy and high reliability. And is configured as follows.

The invention according to claim 1 of the present application (hereinafter referred to as the first invention) is hung from a refueling machine running on a refueling floor so as to be remotely controllable via a retractable mast, A connection mechanism for detachably connecting the connecting grip body to the main body of the fuel gripper that freely releases the fuel handle by the fuel gripping mechanism, and when the connecting grip body is connected to the fuel gripper. And a gripping mechanism that is detachably and interlockably connected to the fuel gripping mechanism and that grips a gripping target other than the fuel so that the grip of the gripping target can be released.

In the invention according to claim 2 of the present application (hereinafter referred to as the second invention), the connecting mechanism has a connecting pin projecting from the fuel grip body and a connecting pin body bored in the connecting grip body. When the connecting pin is fitted into the slit and the connecting pin is inserted into the slit and connected, a locking member is attached to the connecting pin. It is characterized in that the connecting grip body is detachably locked to prevent the connecting grip body from dropping from the fuel grip body.

Further, in the invention according to claim 3 of the present application (hereinafter referred to as the third invention), the gripping mechanism is an interlocking pin that is interlockable with the swingable fuel gripping hook of the fuel gripping mechanism, and this interlocking pin. A swingable swinging fitting portion that is detachably fitted to the swinging swinging portion, a swinging transmission portion that transmits the swinging force of the swinging fitting portion, and a swinging force that is transmitted by the swinging transmission portion. And a hook for freely gripping a grip target other than fuel.

Further, the invention according to claim 4 of the present application (hereinafter referred to as the fourth invention) is a storage rack which detachably supports the connecting grip of any one of the first to third inventions.

Furthermore, in the invention according to claim 5 of the present application (hereinafter referred to as the fifth invention), the storage rack holds the locking mechanism in a locked state while supporting the connecting grip. It is characterized in that it is configured to be released.

[0017]

[Action]

<First to Third Inventions> First, a gripping mechanism suitable for various gripping shapes of a gripping object such as a control rod other than a fuel assembly (hereinafter, simply referred to as fuel), a fuel support fitting, etc. The fuel gripping tool main body is remotely operated and positioned by the fuel changer via the rigid mast, and is connected to the connecting gripping tool main body.

Next, when the gripping operation of the fuel gripping tool is remotely controlled by the fuel changer, the gripping mechanism of the connecting gripping tool is interlocked to grip the gripping target of the control rod or the like. Therefore, the control rod or the like can be moved to an arbitrary location by running the fuel changer on the fuel exchange floor in the gripped state, and required work such as exchange can be performed.

Further, the gripping operation of the fuel gripping tool can be remotely controlled by the refueling machine, so that the connecting gripping tool can perform the gripping release operation.

Further, since the fuel gripping tool is already mounted on the high-rigidity mast of the fuel changer and is equipped with various detectors and interlocks, it can be remotely operated by the fuel changer. When connecting the connecting grip to the tool, the connection can be performed with high accuracy by remote control of the refueling machine.
And it can be performed surely and quickly. Further, since the gripping operation of the gripping object such as the control rod or the like by the connecting gripping tool or the releasing operation thereof can be performed by remote operation of the refueling machine, almost no manual operation is required.

Therefore, most of the work of gripping or transferring the gripping object from the connection between the fuel gripping tool and the connecting gripping tool can be surely and swiftly performed, and the radiation dose of the worker may be increased. This can be eliminated and safety can be improved.

Moreover, since various connecting grips can be selected in accordance with the shape of the grip of the grip target, the range of the grip target can be expanded, and the versatility can be expanded.

<Second Invention> The connecting grip body is surely and promptly connected by inserting the connecting pin of the fuel grip body into the slit, and the disconnection of the connecting grip body is prevented by the fall prevention mechanism. It is safe because it can be prevented.

<Third invention> Since the gripping mechanism of the connecting gripping tool needs only to interlock with the gripping mechanism of the fuel gripping tool, the gripping mechanism can be simplified and the size and weight can be reduced.

<Fourth and Fifth Inventions> The connecting grips can be supported by a storage rack for storage. Further, by installing the storage rack within the moving range of the refueling machine, the connecting grip can be connected to the fuel grip by remote control, and the safety can be improved.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a longitudinal sectional view of an essential part of an embodiment of the present invention, showing a cylindrical body 24 of a fuel gripping tool 23 in an upper end portion of the cylindrical body 22 of a connecting gripping tool 21 in the figure. It shows a state in which the middle and lower end portions are insertably and detachably inserted and are concentrically connected.

The fuel gripping tool 23 has a pair of connecting pins 25a, 25b diametrically opposed to the outer surface of the cylindrical body 24 of the conventional fuel gripping tool 8 shown in FIG.
On the other hand, a hook 25 of a fuel gripping mechanism for freely gripping the handle of the fuel assembly 9 (hereinafter, simply referred to as fuel) is provided.

Further, the fuel gripper 23 is connected to a distal end portion of a telescopic mast having a rigidity made of, for example, a multi-cylinder type telescopic, which is suspended by the fuel changer 7 shown in FIG. By the remote operation of the fuel changer 7, the fuel grip hook 25 is appropriately swung to grip the fuel grip or release the grip.

The fuel gripper 23 further includes a gripped state of the fuel handle and a released state of the fuel grip, and various pools 3 and 4 (see FIG. 4) such as the reactor well pool 2 at the time of grasping and releasing the grip. The refueling machine 7 is already equipped with various detectors (not shown) for detecting the depth, the load state applied to the gripping tool, and various interlocks. Already provided.

On the other hand, as shown in FIG. 2, the connecting grip 21 has a pair of L-shaped connecting slits 2 opposed to each other in the diametrical direction at the upper end portion of the inner and outer double cylindrical main body 22.
6 and 27 are formed, and the pair of connecting pins 25a and 25b of the fuel gripping tool 23 are fitted into the fuel gripping tool main body 24 so that the connecting gripping tool main body is detachably connected. I am configuring.

These connecting slits 26 and 27 have L
The upper ends of the character-shaped vertical portions 26a and 27a are opened, while the horizontal portions 26b and 27b are extended in the same circumferential direction of the connecting grip body 22.

As shown in FIG. 1, the connecting grip 21 has stoppers 28, 29 projecting from the outer periphery of the upper end of the main body 22 so as to face each other in the diametrical direction.

The stoppers 28 and 29 accommodate drop-preventing hooks 30 and 31 movably in the axial direction, and these drop-preventing hooks 30 and 31 are connecting pins of the fuel gripper 23 as shown in FIG. Hook-shaped hook portions 30a and 31a hooked on the connecting pins 25a and 25b when the connecting grips 21 and 25a and 25b are fitted and connected in the connecting slits 26 and 27 of the connecting grip 21 and the intermediate portion in the axial direction. The crank portions 30b and 31b that are bent in a crank shape are integrally formed.

Further, the respective hooks 30 and 31 for preventing the falling are
For example, coil-shaped springs 32a and 32b provided on the crank portions 30b and 31b, respectively, constantly urge the fall-prevention hooks 30 and 31 downward so that the fall-prevention hooks 30 and 31 are connected to the connecting pins 25a and 31b. 25b to prevent the connecting pins 25a and 25b from coming off the connecting slits 26 and 27, and to prevent the connecting grip 21 from falling off the fuel grip 23. Is configured.

Furthermore, the respective hooks 30 and 31 for preventing the falling off
Has its lower ends 30c and 31c connected to the stoppers 28 and 2 respectively.
9 is slightly projected downward from the lower end of the hook 9, and the lower end portions 30c and 31c are pushed upward against the spring force of the springs 32a and 32b so that the hook portion 3
0a, 30b are pushed up to connect the connecting pins 25a, 25
The engagement with b is released.

The connecting grip 21 has its main body 2
A hook operation transmission mechanism 33 for transmitting the swing of the fuel grip hook 25 is provided in the unit 2. The hook operation transmission mechanism 33 is a rectangular pin 25c concentrically provided on the swing base end portion 25d of the fuel gripping hook 25 of the fuel gripping tool 23.
In addition, it has a forked hawk portion 34 which is detachably fitted into the U-shaped opening from its lateral direction.

The fork portion 34 of the fork portion 34 has its tip end portion 34a rotatably attached to the upper end portion of the vertical rod 35 so that the vertical rod 35
Is rotatably connected to one end of a hook-shaped connecting grip hook 36.

The connecting grip hook 36 has a hook-shaped hook portion 36a other than fuel, for example, the control rod 11 shown in FIG.
Various shapes are formed so that the grips of gripping objects such as the fuel support fitting 12 and the fuel support fitting 12 can be gripped, respectively, and an axially intermediate portion thereof is rotatably attached to the lower end portion of the connecting grip body 22 in the figure by a pin 36b. ing.

Therefore, like the fuel grip hook 25, the connecting grip hook 36 is swung around the pin 36b by the remote operation of the fuel changer 7 to perform the grip operation and the grip release operation. be able to.

Further, a guide 37 protruding vertically outward from the lower end of the connecting grip body 22 is fixed to the lower end of the connecting grip body 22, and the guide 37 allows the control rod 11 or the like to approach the object to be gripped. It is supposed to guide you.

As shown in FIG. 2, the connecting grip 21 thus constructed is supported with its lower end inserted into the inside of the cylindrical main body 39 of the storage rack 38 from the open upper end thereof. Stored and stored.

The storage rack 38 has its main body 39 erected concentrically on a rectangular plate-shaped base 40 having a diameter larger than that of the main body 39, and is installed at a predetermined position within the moving range of the fuel changer 7. A pair of stopper slits 41 opposed to each other in the diametrical direction are cut out in the main body 39, and the pair of stoppers 28 and 29 of the connecting grip 21 are fitted into the slits 41, respectively. .

The stopper slit 41 is notched by a predetermined length in the axial direction from the upper end of the opening of the main body 39, and an expanding portion 41a is formed at the upper end of the drawing so as to expand upward and to the left and right in the drawing. 28 and 29 are guided so as to be easily fitted into the slits 41 for stoppers, respectively.

Next, the operation of this embodiment will be described.

The connecting grip 21 has its grip hook 3
There are various types depending on the shape of 6a, but all of them are supported by a storage rack 38 as shown in FIG. 2 and stored at a predetermined position.

In this storage state, since the stoppers 28, 29 are fitted in the stopper slits 41 of the storage rack 38, the hooks 31, 31 shown in FIG. Lower end 30c, 31c
Are pressed against the bottom surface of the stopper slit 41.

For this reason, the hooks 30 and 3 for preventing each drop-off are provided.
1 rises up against the spring force of the springs 32a and 32b, so that the hook portions 30a and 30b rise up as shown by the chain double-dashed line in FIG. 3, and the lock of the fall prevention mechanism is released. is there.

Next, the fuel changer 7 is operated to move the fuel gripping tool 23 immediately above the required connecting gripping tool 21 for positioning, and then inserted into the inside thereof to rotate about the axis. The pair of connecting pins 2 of the fuel grip 23
5a and 25b are fitted into the pair of connecting slits 26 and 27 of the connecting grip 21 from the upper end of the opening.

Thereafter, the fuel grip 23 is further lowered slightly and then rotated slightly, so that each connecting pin 2
5a and 25b are slid in the L-shaped connecting slits 26 and 27 to the tips of the lateral portions 26b and 27b.

As a result, the connecting grip 21 of the fuel grip 23 is firmly connected, and the forked hawk portion 34 of the hook motion transmitting mechanism 33 of the connecting grip 21 is connected to the rectangular pin 25c of the fuel grip hook 25. It is inserted and connected from the U-shaped opening. On the other hand, as shown in FIG. 3, the connecting pins 25a and 25b are located below the hook portions 30a and 31a of the fall prevention hooks 30 and 31 shown by the two-dot chain line in the figure.

Then, when the fuel grip 23 is lifted upward, the connecting grip 21 connected by the pair of connecting pins 25a, 25b and the pair of connecting slits 26, 27 is lifted and lifted from the storage rack 38. Removed.

For this reason, since the lower ends 30c and 31c of the fall prevention hooks 30 and 31 of the connecting grip 21 are separated from the bottom surface of the stopper slit 41 of the storage rack 38, the fall prevention hooks 30 and 31 are attached to the spring 32a. ，
The hook portion 30 is urged downward by the spring force of 32b.
As indicated by the solid line in FIG. 3, a and 31a move downward and are engaged and locked by the connecting pins 25a and 25b. As a result, the connection between the connecting grip 21 and the fuel grip 23 is locked, so that the connecting grip 21 can be prevented from falling off from the fuel grip 23.

When the fuel grasping hook 25 is rocked to perform a grasping operation by remote control with the fuel changer 7, the operation is transmitted to the connecting grasping hook 36 via the hook operation transmitting mechanism 33. The grip hook 36 grips the grip of an object to be gripped such as the control rod 11.

Therefore, in this gripped state, the refueling machine 7 is moved on the exchange floor 1, or the gripping target such as the control rod 11 is moved or raised by contracting the mast or the like to transfer it to an appropriate position. can do.

After that, the connecting grip 21 can be detached from the gripping target such as the control rod 11 by performing the grip release operation of the connecting grip 21 by remote operation of the fuel changer 7.

Therefore, according to this embodiment, the connecting grip 21 is connected to the fuel grip 23 which is already attached to the fuel changer 7 by the mast having sufficient rigidity, and the connecting grip 21 is connected. As a result, the gripping target other than the fuel, such as the control rod 11, is gripped, so that the swinging of the coupling gripping tool 21 at the time of movement is small and the positioning accuracy with the gripping target or the like is high. Therefore, the connection grip 21 and the fuel grip 23 can be connected to each other with high accuracy, reliability and speed.

Further, since the connecting grip 21 can be connected to the fuel grip 23 by remote control of the fuel changer 7, various grips can be manually attached to the wire of the auxiliary hoist 13 as in the conventional example. Compared with the case of replacing, it is possible to reduce the radiation dose of the worker and enhance the safety, and at the same time, reduce the labor and simplify and speed up the connecting work.

Furthermore, since various detectors, interlocks, and monitoring functions already provided on the fuel grip 23 can be used for the connection grip 21, it is possible to perform various operations using the connection grip 21. The reliability can be improved, and the skill of the work is not required.

Further, since various connecting grips 21 can be appropriately selected and used according to the shape of the grip to be gripped, the range of the gripping target can be expanded and versatility can be enhanced.

[0061]

According to the first to third aspects of the present invention, therefore, the connecting grip is connected to the fuel grip already suspended by the mast having sufficient rigidity in the refueling machine. Since the grasping object such as a control rod other than the fuel is grasped by the connecting grasping tool, the deflection of the connecting grasping tool during movement is small and the positioning accuracy with the grasping object is high. Therefore, the connection grip and the fuel grip can be connected to each other with high accuracy, reliability and speed.

Further, since the connecting grip can be connected to the fuel grip by remote control in the refueling machine, compared to the case where the various grips are manually attached to the wire of the auxiliary hoist as in the conventional example. As a result, it is possible to reduce the radiation dose of the worker and improve the safety, and at the same time, reduce the labor and simplify and speed up the connecting work.

Furthermore, since various detectors, interlocks, and monitoring functions already provided on the fuel grip can be used for the connecting grip, reliability of various operations using the connecting grip can be improved. Not only can it be improved, but it also has the effect of not requiring work skills.

Since various connecting grips can be appropriately selected and used according to the shape of the grip to be gripped, the range of the gripping target can be expanded and versatility can be enhanced.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical cross-sectional view showing a connected state of an embodiment of a connecting grip and a fuel grip according to the present invention.

FIG. 2 is a perspective view showing a state in which the connecting grip shown in FIG. 1 is stored in a storage rack.

FIG. 3 is a partially enlarged view showing the operation of the fall prevention hook shown in FIG.

FIG. 4 is a schematic vertical sectional view showing a general refueling floor.

[Explanation of symbols]

 1 Refueling floor 2 Reactor well pool 5 Reactor pressure vessel 6 Reactor containment vessel 7 Refueling machine 8 Conventional fuel gripping tool 9 Fuel assembly (fuel) 11 Control rod 12 Fuel support fitting 21 Connecting gripping tool 22 Connecting grip body 23 Fuel grip 24 Fuel grip body 25 Connecting grip hooks 25a, 25b Pair of connecting pins 25c Rectangular pin 25d Swing base end 26, 27 Pair of connecting slits 28, 29 Stopper 30, 31 Fall Prevention Hooks 32a, 32b Spring 33 Hook Motion Transmission Mechanism 36 Connection Grip Hook 37 Connection Grip Guide 38 Storage Rack 39 Storage Rack Main Body 41 Stopper Slit

Claims (5)

[Claims] 1. A main body of a fuel gripping tool which is hung on a refueling machine running on a refueling floor by a telescopic mast so as to be remotely controllable and which allows a fuel gripping mechanism to freely release a fuel handle. A connecting mechanism for detachably connecting the connecting grip body, and a detachable and interlocking connection with the fuel gripping mechanism when the connecting grip body is connected to the fuel gripping body. A grasping mechanism for connecting the grasping object other than the fuel so as to freely release the handle. 2. The connecting mechanism comprises a connecting pin projecting from the fuel grip body, a slit formed in the connecting grip body so that the connecting pin can be inserted and removed freely, and the connecting grip body. When the connecting pin is fitted into the slit and connected, the engaging member is engageably and disengageably engaged with the connecting pin so that the connecting grip body has the fuel gripping tool. The connecting grip according to claim 1, further comprising a dropping mechanism that prevents the grip from being dropped from the main body. 3. The gripping mechanism includes an interlocking pin that is interlockable with an oscillating fuel grabbing hook of the fuel grabbing mechanism, and an oscillating swinging fitting portion that is removably fitted to the interlocking pin. A swing transmission portion that transmits the swing force of the swing fitting portion,
3. The connecting grip according to claim 1 or 2, further comprising a hook that swings by a transmission force of the swing transmission portion and that freely grips a grip of a gripping object other than fuel. 4. A storage rack which detachably supports the connecting grip according to any one of claims 1 to 3. 5. The storage rack according to claim 4, wherein the storage rack is configured to release the locking state of the dropout prevention mechanism while supporting the connecting grip. .