JPH08233982A - Core plug treatment device - Google Patents

Abstract

PURPOSE: To prevent the fall of fragments of latch and the like into core during simultaneous withdrawal of two core plugs. CONSTITUTION: Beneath a column 4 of a treatment device, a plate receiver 8 is provided and this plate receiver 8 is put on a main plate 21. Beneath the main plate 21 a catcher 27 is fixed to a catcher holder 28. To th catcher holder 28, an auxiliary lever 29 is connected with pins and to one end of this auxiliary lever 29, an L-shape lever 19 is connected with pins. The other end of the L- shape lever 19 is connected to the first piston shaft 15. The rectangular part in the middle of the L-shape lever 19 is connected to the end of the catcher column with pins. When the L-shape lever 19 is pushed in, the catcher 27 proceeds and when it is drawn up, the catcher 27 retires. In the case the catcher 27 is compressed to the wall of the outer side of an instrumentation tube guide tube 3 to be distorted into 8-shape, the fragments of latch 24 and the like are captured and contained by the catcher 27 positioning below the two core plugs 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for handling a core plug which prevents a broken piece of the core plug closing a flow passage hole formed in a core support plate of a boiling water reactor from dropping into the core. .

[0002]

2. Description of the Related Art In a boiling water reactor, as shown in FIG. 6, a reactor pressure vessel 43 is supported by a pedestal 48 inside a reactor containment vessel 42, and a core support plate is inside the reactor pressure vessel 43. 35
And a shroud 45 that holds the upper lattice plate 37 and wraps the entire fuel assembly to form a core. Upper grid
A neutron instrumentation tube 2 is provided from 37 through the core support plate 35.

The neutron instrumentation tube 2 is inserted into a guide tube 3 of the instrumentation tube, and the guide tube 3 is erected upright through a vessel 47 that closes the lower end opening of the reactor pressure vessel 43. The neutron instrumentation tube 2 is connected to a measuring instrument outside the reactor by a lead wire 46.
A shroud head 44 is provided on the upper end of the shroud 45, and an upper end opening of the reactor pressure vessel 43 is closed by a pressure vessel cover 41.

A rail 40 is laid on the upper floor of the reactor containment vessel 42, and a refueling machine 38 is placed on the rail 40 so that it can run freely. A hoist 39 is attached to the refueling machine 38, and the pool above the reactor containment vessel 42 is filled with water to maintain an appropriate water level 50.

FIG. 7 shows the arrangement of the instrumentation tube guide tubes 3, control rod guide tubes 9, core plugs 23, etc. as seen from above the upper grid plate 37 in the reactor pressure vessel 43 in FIG. . The guide tube 3 of the instrumentation tube is provided at the intersection of the upper grid plate 37, and the core plug 23 is inserted on the core support plate 35 below the upper grid plate 37 in four cross directions with respect to the guide tube 3.

In the boiling water reactor, a circular hole is provided in the core support plate 35 as an orifice for circulating water in the reactor, and a core plug 23 is provided to close the circular hole. This core plug 23 needs to be removed and replaced after a long time. A dual core plug handling tool is used for the replacement.

For example, 88 core plugs 23 are provided in one plant, depending on the plant, but they are detached or intentionally replaced with new ones for sampling to confirm age hardening etc. at the time of periodic inspection of the plant.

Explaining the core plug 23, it has the structure shown in FIG. That is, in FIG. 8, a body 51 and a flow path hole 52 of the core support plate 35 are provided at the upper end of the body 51.
A collar upper portion 53 having a shape sized to close the upper edge opening of
The guide portion 5 formed on the lower portion and the lower portion of the upper portion 53 of the collar.
4 and 55. On the other hand, a shaft 57, which is slidable in the axial direction, is closely fitted in the center hole 56 of the body 51.
A vertical groove 58 having a required length is formed by cutting from the lower end surface of 57.

A latch 59, which is longer than the inner diameter of the flow path hole 52, is incorporated in the vertical groove 58. Latch 59 is a vertical groove
It is rotatably supported by a pin 60 that crosses 58,
It is stored in the slit 61 in a substantially vertical state. In order to enable the storage of the latch 59 as described above, the axial direction of the pin 60 is defined as a direction orthogonal to the surface connecting the slits 62.

Then, the head 63 of the shaft 57 is strongly pushed downward in the figure against the spring force of the spring 64, so that the position of the pin 60 is lowered and the latch 59 is pushed out below the flow path hole 52. It turns 90 degrees by gravity and becomes horizontal. Here, when the external force applied to the shaft 57 is removed, the shaft 57 is pushed up by the elastic restoring force of the spring 64, and the stick portion of the latch 59 abuts against the lower surface of the core support plate 35 and is attached.

[0011]

Flow path holes in core support plate 35
The core plug 23 that closes the 52 is often replaced and inspected at the time of periodic inspection of the plant, but the working environment is such that there is a deep water in the reactor pressure vessel 43, a narrow place, and the work is very difficult to do. . When pulling out two core plugs at the same time in such a working environment, it is quite difficult to prevent broken pieces such as latches from falling into the core.

That is, in the prior art, for example, a core support plate plug withdrawal assisting device described in Japanese Patent Publication No. 56-26837 has been used to damage a receptacle that can be selectively moved to a storage position located directly below the core plug. I was receiving a latch.
However, this device cannot accommodate this because only one latch piece for one core plug can be stored in one saucer.

In recent years, a large number of core plug drawing operations have been carried out, and it has been developed so that two drawing operations can be carried out at the same time. In the conventional apparatus, one hand drop (unmatching) causes poor workability, resulting in poor efficiency. There are challenges that are not relevant.

Therefore, there has been a demand for the development of a device capable of catching a broken piece such as a latch tied up with a plug handling tool capable of pulling out two core plugs at the same time just before it falls into the core.

The present invention has been made in order to solve the above problems and satisfy the above demands. As catchers for catching the latches of the core plug, two catchers are moved immediately below the core plugs at the same time and latched. It has a structure that can store the broken pieces, and it is possible to cover the two core plugs directly underneath with one catcher at the same time, greatly improving the efficiency of the core plug withdrawal work, and a lot of core plug withdrawal work in a short time. An object of the present invention is to provide a device for handling a core plug that can reliably handle the problem.

Also, the present invention has the ability to tie up with a plug handling tool that handles two core plugs at the same time and store the latch broken pieces corresponding to the two core plugs, thus saving the work of taking out the core plugs. The object is to provide a core plug handling device that can be used.

[0017]

According to the present invention, a catcher is provided below the core plug from the reactor water circulation port of the control rod guide tube, the catcher is attached to the second cylinder, and the second cylinder is provided inside the second cylinder. Insert the piston shaft of and connect this second cylinder to the catcher holder,
The catcher holder is provided with an auxiliary lever, the auxiliary lever is attached to one end of the L-shaped lever, and the other end of the L-shaped lever is attached to the first piston shaft inserted into the first cylinder. The fulcrum is attached to the catcher column.

[0018]

Operation: A catcher for accommodating the broken pieces of the latch of the core plug is constituted by, for example, a rubber-like elastic material. Due to the strain effect of this elastic material, the structure is such that it can be swollen to the left and right and deformed into a gourd shape, and the strain is performed by advancing and retracting the holder of the catcher by the L-shaped lever.

The initial position is determined by the contact with the neutron instrumentation tube due to the forward movement of the cylinder piston axis. In this way, after the positioning, the catcher is deformed and the catcher projects below the two core plugs located at the positions related to the neutron instrumentation tube. Then, these components are combined on the catcher column and the main plate, and the column of the handling tool can be freely attached to and detached from the plug handling tool.

When the plug handling tool is used for core plug withdrawing work, if a latch catcher is combined, the broken pieces of the latch of the core plug are captured when the two core plugs are withdrawn, and the latch fragments are not dropped into the core. It can be stored in the catcher and taken up with the plug handling tool.

Since the core plug is inserted in a position where it is distributed to the neutron instrumentation pipe, the catcher hits the guide pipe of the instrumentation pipe by pushing the piston shaft end, and the catcher is compressed and deformed into a gourd shape to form two pieces. You will be able to enclose the bottom of the core plug.

That is, since the piston shaft and the catcher can be freely taken in and out of the reactor water circulation port of the control rod guide tube,
Positioning after installation is constant from this part, the cylinder and piston reciprocate simultaneously by the L-shaped lever, the leading piston shaft end contacts the guide pipe of the instrumentation pipe, and the holder of the cylinder and catcher must stop the forward movement. The catcher surrounds the bottom of the two core plugs that are distorted and distributed evenly from the neutron instrumentation tube.

The plug handling tool fitted in the support fitting on the main plate does not directly contact the control rod guide tube, but when the main plate is installed on the control rod guide tube, the limit switch of the plug handling tool is provided by the plate receiver. Works. The plug handling tool and the latch catcher can be easily installed on the control rod guide pipe without overloading the control rod guide pipe, and can be confirmed from the upper part of the furnace.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a core plug handling apparatus according to the present invention will be described with reference to FIGS. FIG.
Shows a state in which the apparatus for handling a core plug of the present invention is installed on a core support plate, FIG. 2 is a top view seen from the direction of arrow AAAA in FIG. 1, and FIG. In the BB arrow cross-sectional view,
FIG. 4 shows a state in which the catcher is extended, and FIG. 5 shows the catcher.

In FIG. 1, reference numeral 1 is a plug handling tool, and reference numeral 2
Is a neutron instrumentation tube, and the neutron instrumentation tube 2 is an instrumentation in which the spindle head of the neutron instrumentation tube 2 is fitted to the lower end of the intersection of the upper lattice plate 37 shown in FIG. 7 and fixed to the core support plate 35. The pipe passes through the inside of the guide pipe 3 and projects out of the lower bottom vessel 47 of the reactor pressure vessel 43 shown in FIG.

The core support plate 35 is a shroud 45 shown in FIG.
Is supported by the upper plate of the core support plate 35 and the upper lattice plate.
A large number of fuel assemblies are set upright with 37, and control rods are inserted between the fuel assemblies to move up and down.

The control rod guide tube 9 is for inserting a control rod, and stands up from a stub tube on a vessel 47 that closes the lower end of the reactor pressure vessel 43 up to the core support plate 35.
Normally, a directional pin stands up from the core support plate 35 to position the control rod guide tube 9, and a fuel support fitting (not shown) is set on the control rod guide tube 9 in accordance with this pin (see FIG. 7). ).

Direction plate 36 to be loaded at the pin position showing directionality
The support metal fitting 22 is provided on the main plate 21 having the
The tip of the column 4 of the plug handling tool 1 is fitted in 22 and the spindle end of the limit switch 5 for vertically moving the hollow shaft supported by the bearing in the column 4 is seen.

The plate 6 is a plate that comes into direct contact with the end of the shaft 57, and has an elongated hole that moves using the pin 7 as a guide.
The plate receiver 8 is a kind of lever and pushes up the plate 6 to act on the limit switch 5 when the plate receiver 8 is pushed up directly from the hole provided in the lower part.

The lower end of the plate 6 is supported by a pin provided on the plate receiver 8, and the support fitting 22 is a plug handling tool 1.
The tip of the column 4 is fitted and fixed on the main plate 21. The outside of the main plate 21 is fitted inside the control rod guide tube 9,
And the shell 33 which goes down is dispatched. The shell 33 is a cylinder and the seat plate 31 and the seat plate 32 are integrally provided.

The seat plate 32 is derived from the semicircular guide 30, and this guide 30 is effective as a tip guide when the main plate 21 is fitted to the control rod guide tube 9. On the other hand, on the upper part of the main plate 21, a catcher column 11 for fixing the main plate 21 is provided in parallel with the plug 1 other than the support fittings 22.

The uppermost end of the column 11 is directly fastened to the plug handling tool 1 by screwing or the like, and the spring receiver 17 is also derived from the interruption by screwing or the like to provide a spring 18. This spring
18 is distributed to the left and right, and is hung from the spring bearing, but the end is engaged with the first piston shaft 15 and exerts a force to pull back the first piston shaft 15.

The first piston 14 is fixed to the upper end of the first piston shaft 15 and slides into the cylinder 13. First
The cylinder 13 is fixed to the catcher column 11 via the bearing 12.

The lower end of the first piston shaft 15 has an L-shaped lever 19
Is pin-coupled to. L-shaped lever 19 is a catcher column
11 is also pin-jointed, and if the first piston shaft 15 is lowered with this as a fulcrum, the auxiliary lever 29 pin-joined with the other end of the L-shaped lever 19 advances. First piston
When 15 rises, the auxiliary lever 29 moves backward.

The tip of the auxiliary lever 29 has a catcher holder 28.
This catcher 27 is the second
It will slide on the outer shell of cylinder 25. The outer shell of the second cylinder 25 is provided with a middle portion at the front portion and the rear portion, and forms a weir for the movement of the catcher holder 28. When the catcher holder 28 comes into contact with another weir, the second cylinder 25 also receives a forward force, and when the catcher holder 28 comes into contact with the weir after the second weir
The cylinder 25 of is retracted.

That is, the catcher 27 is distorted when moving forward,
When retracted, the catcher 27 is in a stretched state, and there is no hindrance when passing through the reactor water circulation port of the control rod guide tube 9.

The core plug 23 has a body as shown in FIG.
Latch on the end of the central shaft 57, which is supported by spring 63 on 21
24 (indicated by reference numeral 59 in FIG. 8) is pin-jointed and is inserted vertically into the slits 61, 62 of the shaft 57 along the inside of the body when inserted, but when the shaft head 63 is pushed in,
When the shaft 57 descends against the spring 64, and the latch 24 (59) freely rotates at the part where it is separated from the body 51 and becomes free, and becomes horizontal and stops pushing the shaft 57, the core support plate 35 remains as it is. The core plug 23 is brought into contact with the back surface by the elastic force of the spring 64 under the shaft 57.
Prevent levitation.

Here, when removing the existing part, the shaft 57 is pulled upward, the latch 24 (59) is deformed into an eight shape, and is narrowed down into the passage hole 52 in which the body 51 is inserted, and the core plug It is taken out while attached to 23. When there is a risk that the latch 24 (59) will be hardened over time after being deformed into the shape of a figure eight and broken, the latch catcher 27 needs to surround the lower portion of the core plug 23.

As shown in FIG. 2, a support fitting 22 is fixed on the main plate 21. The plate 6 of the plug handling tool 1 wraps over the plate 8 receiver. A direction plate 36 is attached on the main plate 21. The left and right sides of the direction plate 36 are plugs 23, and the center tip of the direction plate 36 is the installation position of the guide tube 3 of the instrumentation tube. The neutron instrumentation tube 2 is housed inside the guide tube 3. The guide tube 3 is fixed to the core support plate 35 and is open.

The catcher column 11 may be a cylindrical column,
The lower surface is fixed on the main plate. Springs 18 stand up and down on both sides of the first cylinder 13 fastened to the catcher column 11. What is visible at the left end is the left end of the L-shaped lever 19, and the joint portion here may be suspended by a rope or the like, and can be forcibly pulled up when the first piston shaft 15 does not return.

Further, as shown in FIG. 3, the catcher 27, in which the head of the second piston shaft 26 is in contact with the guide tube 3 of the instrumentation tube, is made of, for example, a rubber molding material. It is compressed to the left and right, deformed into a gourd shape, and overhangs. The catcher holder 28 is the second cylinder 25 as shown in FIG.
It is in contact with the middle part of the front part of the.

The auxiliary lever 29 is pin-jointed to the catcher holder 28. An electromagnetic guide is attached to the second cylinder 25 on the side of the middle portion of the rear portion of the second cylinder 25, and the position can be indicated by the position sensor 34. A plurality of position sensors 34 are provided, and the other one is transmitted when the second cylinder 25 is finally retracted. The illustrated hose 20 represents the pressurized fluid inlet of the second piston shaft 26.

FIG. 4 is a diagram showing the state of the latch catcher when it returns. While the piston shaft end is in contact with the guide tube of the neutron instrumentation tube 3, the catcher holder 28 starts to return by the withdrawal of the auxiliary lever 29, the catcher 27 is extended and the catcher holder 28 comes into contact with the rear middle part. If the auxiliary lever 29 is moved to the retracted side as it is, the catcher 27 passes through the reactor water circulation port of the control rod guide tube 9, and the second cylinder 25 and the catcher 27 are housed inside the shell 33.

As shown in FIG. 5, the catcher 27 is a rectangular cube which is formed in the shape of a lunch box and has an open top. The remaining portion of the front upper cover is a portion that is inserted and fixed in the catcher holder 28.

As shown in FIG. 7, the latch catcher 10 of this embodiment is installed at the open end of the core support plate 37 of the control rod guide tube 9. The guide tube 3 of the neutron instrumentation tube is provided at the intersection of the upper lattice plates 37. A core plug 23 is arranged on the core support plate below the upper lattice plate in four directions with respect to the guide tube 3. When the catcher 27 is pressed and distorted,
Enclose the lower part of the core plug 23 at several places.

Next, an example of use of the core plug handling apparatus of this embodiment will be described. First, referring to FIG.
Is equipped with a hoist 39 and the like, and the plug handling tool 1 is hung in the reactor water so that the reactor water operation can be performed. Rails 40 run over the hearth and may move refueling machine 38. Sign
50 shows the state of the reactor water level. After removing the pressure vessel cover 1 and the shroud head 44, etc., inspect the furnace using the plug handling tool 1.

The neutron instrumentation tube 2 passes through the guide tube 3 and projects toward the pedestal 48 side below the reactor pressure vessel 43. Lead
46 is connected to the central operation room (control room). The service platform 49 is installed on the pedestal 48 side and is used for work under the reactor pressure vessel 47. After the fuel transfer is completed during the periodic inspection of the reactor, the core support plate and the plug are replaced.

At this time, the fuel support fitting and the control rod are temporarily removed, and the core support plate 35, the plug handling tool 1 and the latch catcher suspended from the hoist 39 of the fuel exchanger 38 are set on the control rod guide tube 9.

Since the upper grid plate is guided in advance, the latch catcher installed below the core plug handling tool seats on the control rod guide tube 9 and then the plate receiver 8 operates to operate the limit switch of the plug handling tool. Then, the lamp display etc. can be used to confirm even in the upper part of the furnace.

After confirming that the plug handling tool 1 has been seated, fluid pressure is supplied to the first cylinder 13 and the L-shaped lever 19
Is rotated, the auxiliary lever 29 at the other lever end of the L-shaped lever 19 is driven out, the catcher holder 28 is moved onto the second cylinder 25, and the catcher holder 28 is engaged with the weir at the front portion. While pushing out, the second cylinder 25 is also pressurized to expel the second piston shaft 26,
Stretch 27.

In this state, the direction of the control rod guide pipe 9 can be determined because the direction plate 36 and the pin implanted in the core support plate 35 engage with each other when passing through the core circulation port or when preset. It can move smoothly without any problems such as interference or contact with the circulation port.

When the tip of the piston comes into contact with the neutron instrumentation tube, the piston shaft stops, but only the cylinder 25 further advances due to the above-mentioned weir to press and deform the catcher 27. Then, since the position sensor 34 operates, it can be confirmed on the refueling machine that the catcher has an enclosure shape when the latch piece is dropped.

After that, the plug handling tool is made to function and the shaft head 63 of the core plug 23 is grasped and pulled up. At this time, when the latch under the core support plate is deformed into a figure eight and pulled up,
In the unlikely event that it hardens and breaks over the years, it will fall into the reactor water, but it will fall into the latch catcher directly below and can be recovered.
Prevents falling into the core.

Although the plug handling tool simultaneously pulls up two core plugs which have not been found in the prior art, the latch catcher of this embodiment which can enclose two core plugs is very effective. Then, the fluid pressure in the first cylinder 13 is cut off, and the L-shaped lever 19 is returned to its original position by the spring 18. If the L-shaped lever 19 does not return for some reason, you can pull it up with a rope.

After confirming that the catcher 27 has been pulled in with the position sensor 34, the plug handling tool 1 is attached to the fuel exchanger 38 on the furnace.
Hoist 39 of hoist. After hoisting, remove the core plug near the workbench in the pool and perform the next core plug removal work.

According to this embodiment described above, the following effects can be obtained. (1) A latch catcher that can accommodate the latch pieces of two drawn-out core plugs in a handling tool that has the function of pulling out two core-plugs at the same time can greatly improve work efficiency.

(2) By using an elastic material such as rubber for the catcher of the latch catcher, it is possible to simultaneously enclose the bottom of two core plugs by utilizing the deformation effect. The structure is simple and easy to handle.

(3) Since the weir is provided in the cylinder and the catcher is pressed outside the reactor water circulation port of the control rod guide tube, the inlet and outlet are good. Also, there is no interference with the control rod guide tube,
You can work safely.

(4) The plug handling tool and the latch catcher can be set in the control rod guide tube as they are. Further, the operation of each part can be confirmed by the signal of the limit switch, and therefore the work can be surely performed in a short time.

In the present embodiment, as the material of the latch catcher, for example, a flexible material which can freely expand and contract within the enclosure of the coil spring other than the rubber material may be laid on the bottom, and when it is restored after compression molding. It is possible to return the piston shaft using not only spring force but also fluid (air, water pressure, hydraulic pressure) pressure.

[0061]

According to the present invention, a detachable latch catcher is attached to a plug handling tool when a core plug is pulled out,
Using this handling tool and a catcher in combination, the catcher is deformed by the contact between the catcher and the neutron instrumentation tube made of an elastic material, and the catcher under the two core plugs located at the relevant position with the neutron instrumentation tube Even if the catcher overhangs and a broken piece is generated, it can be picked up from the lower portion, and the broken piece such as a latch can be prevented from falling into the core.

Therefore, taking into consideration the damage to the latch portion due to age hardening, one handling tool (integrated tool) can
By removing the individual core plugs from the core at the same time and being able to deal with damage to the latch sufficiently, work safety and workability can be greatly improved, and periodic inspection work can be shortened.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of an apparatus for handling a core plug according to the present invention in a side view.

2 is a cross-sectional view taken along the line AAAA of FIG.

FIG. 3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is a partial view showing a state where the catcher in FIG. 1 is extended.

5 is a perspective view showing the catcher in FIG. 1. FIG.

FIG. 6 is a vertical cross-sectional view schematically showing a part of a reactor pressure vessel installed in a reactor containment vessel and its periphery for explaining a conventional example.

FIG. 7 is a layout view of the plug handling tool viewed from the upper lattice plate in FIG.

8 is an enlarged elevational view showing a partial cross section of the core plug in FIG.

[Explanation of symbols]

1 ... Plug handling tool, 2 ... Neutron instrumentation tube, 3 ... Instrumentation tube guide tube, 4 ... Handling instrument column, 5 ... Limit switch, 6
... plate, 7 ... pin, 8 ... plate receiver, 9 ... control rod guide tube, 10 ... latch catcher, 11 ... catcher column, 12 ... bearing, 13 ... first cylinder, 14 ... first piston, 15 ... 1st piston shaft, 16 ... Cap, 17 ... Spring receiving, 18 ... Spring, 19 ... L-shaped lever, 20 ... Hose, 21 ... Main plate, 22 ... Support metal fitting, 23 ... Core plug, 24 ... Latch, 25 ...
2nd cylinder, 26 ... 2nd cylinder shaft, 27 ... Catcher, 28 ... Catcher holder, 29 ... Auxiliary lever, 20 ... Guide, 31 ... Middle seat plate, 32 ... Seat plate, 33 ... Shell, 34 ... Position sensor , 35 ... Core support plate, 36 ... Direction plate, 37 ... Upper lattice plate,
38 ... Refueling machine, 39 ... Hoist, 40 ... Rail, 41 ... Pressure vessel cover, 42 ... Reactor containment vessel, 43 ... Reactor pressure vessel, 44 ... Shroud head, 45 ... Shroud, 46 ... Lead wire, 47 ... Vessel , 48 ... Pedestal, 49 ... Service platform, 50 ... Reactor water level, 51 ... Body, 52 ... Flow path hole,
53 ... Collar upper part, 54, 55 ... Guide part, 56 ... Center hole, 57 ... Shaft, 58
… Groove, 59… Latch, 60… Pin, 61, 62… Slit, 63…
Head, 64 ... spring.

Claims (5)

[Claims] 1. A catcher is provided below a core plug from a reactor water circulation port of a control rod guide tube, the catcher is attached to a second cylinder, and a second piston shaft is inserted into the second cylinder. The second cylinder is connected to a catcher holder, an auxiliary lever is provided on the catcher holder, the auxiliary lever is attached to one end of the L-shaped lever, and the other end of the L-shaped lever is inserted into the first cylinder. 1. A device for handling a core plug, wherein the device is attached to a piston shaft No. 1 and a fulcrum of the L-shaped lever is attached to a catcher column. 2. A first cylinder provided on the catcher column via a bearing, and a first piston shaft connected via a first piston provided on the first cylinder,
The L-shaped lever connected to the first piston shaft and the L-shaped lever
An auxiliary lever connected to the other end of the mold lever, a catcher holder connected to the other end of the auxiliary lever, a catcher provided in the catcher holder, a second piston shaft and a second cylinder for driving the catcher, An apparatus for handling a core plug according to claim 1, further comprising: 3. The core plug handling according to claim 1, wherein the catcher column is provided with a spring via a spring receiver, and an end of the spring is engaged with the first piston shaft. apparatus. 4. The apparatus for handling a core plug according to claim 1, wherein the catcher is a rectangular cube and is formed of an elastic body having an open upper end and being deformed into a substantially gourd shape when pressed. 5. A shell is provided in a control rod guide tube provided on the core support plate, a main plate is provided at an upper end of the shell, a plate receiver is provided on the main plate, and a plug handling tool is provided on the plate receiver through a support fitting. 2. The apparatus for handling a core plug according to claim 1, wherein said column is erected and a second cylinder having said catcher is inserted from a reactor water circulation port of said control rod guide tube.