JPH0540192A - Coupler for core support plate pin - Google Patents

Abstract

PURPOSE:To enable underwater jigs directing exactly and tightly and aligning axis by separating the lower extension part of a cylinder into two branches, connecting end plates to them free of swinging and connecting the upper end of the one end plate to the arm bottom free of rotation. CONSTITUTION:A coupler 21 for core support pin fitted over a core support plate pin 22 by gripping with a pair of end plates 40 and 42 is fixed on underwater jigs. A cylinder is operated at this state to move a piston rod 36. By this, the middle body of the end plate 40 connected at the tip of a lever 37 is pushed to the outer surface of the support plate pin 22 by way of the arm 37 connected with the rod 36 and the lever 38 connected with this, the one extension part of the cylinder is pushed by the reaction force to the outer surface of the support plate pin 22, the coupler is fixed tightly to it in press support state and at the same time, aligning of axis is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core support plate pin fitting capable of installing an underwater tool on the upper surface of the core support plate for performing work and inspection above or below the core support plate of a boiling water reactor. The present invention relates to a fitting tool, and more particularly to a fitting tool for a core support plate pin that is fitted to a core support plate pin protruding from the upper surface of a core support plate to perform orientation and centering of an underwater tool.

[0002]

2. Description of the Related Art In a boiling water reactor, the fuel group loaded in the core of the reactor is arranged between the upper lattice plate and the fuel supports on the core support plate, and the control rods are arranged between the fuel groups. It is guided in a control rod guide tube extending downward from the support plate. When performing work and inspection above or below the core support plate during periodic inspections, etc., move the fuel assemblies and control rods that make up the fuel group, and in some cases remove the control rod guide tubes to remove the core support plate. It is common practice to install underwater tools on the upper surface of the.

Although this underwater tool is not constant depending on the application in each case, conventionally, a grooved lug is generally provided on the flange or the body of the underwater tool, and this grooved lug is projected on the upper surface of the core support plate. It was installed on the core support plate while orienting the underwater tool to the core support plate by fitting the core support plate pins.

An expanded flange portion of the sleeve of the control rod guide tube is attached to the opening of the core support plate, and the fuel support is placed on the floor surface of the sleeve, so that the cooling water flow rising from below is prevented. , It passes through the side hole of the sleeve to the side hole of the fuel support and boiled to form a gas-liquid two-phase flow while passing between the fuel groups on the fuel support, and then guided to the steam separator on the upper lattice plate. Is separated into steam and water, and the steam separated into steam and water becomes high-temperature and high-pressure dry steam in the steam dryer, and is sent to the steam turbine.

In this case, the sleeve of the control rod guide tube, the fuel support, and the like in the core support plate had to be fitted in the same direction by fitting the core support plate pins and the grooved lugs. Therefore, even in the underwater tool, it is necessary to perform orientation according to the function, by providing a grooved lug corresponding to the grooved lug in the underwater tool, and by fitting the grooved lug to the core support plate pin, Underwater tools were being oriented.

Here, the grooved lug has a groove in an open shape on the front surface, and a core support plate pin is inserted between both sides of this groove. It was not a so-called fit type in which the core support plate pin was strongly sandwiched, with a small gap.

Therefore, in the case of an underwater tool, even if a slight displacement occurs between the underwater tool and the core support plate or the sleeve of the guide tube during or at the time of functioning, the position to allow this displacement Was taken.

The position of the core support plate in the core is, for example, about 25 m below the water surface, and the underwater tool is suspended by a wire rope using an auxiliary hoist or the like provided on the service platform above the core. It was usually mounted on a support plate and allowed to stand still by its own weight.

[0009]

However, as the use of underwater tools expands, it becomes possible to install the submerged tools on the core support plate with less positional displacement during work or inspection by the underwater tools on the core support plate. For, that is, can be attached to the core support plate pin as easily as a grooved lug,
Moreover, it has become strongly desired to have a simple fitting tool for core support plate pins in the underwater tool that can not only be firmly fitted but can be easily unfastened and lifted up with each underwater tool. Came.

The present invention has been made in view of the above circumstances, and is a core support plate pin fitting to be fixedly used for an underwater tool having a function of being installed on the core support plate to perform work and inspection. It is a tool that can be easily fitted to the core support plate pins, and moreover, the orientation and centering of the underwater tool can be made more accurate and strong, and the function expansion of the underwater tool on the core support plate can be supported. An object of the present invention is to provide a fitting tool for core support plate pins.

[0011]

In order to achieve the above object, a core support plate pin fitting according to the present invention is applied to a core support plate pin projecting from an upper surface of a core support plate of a boiling water reactor. A core support plate pin fitting tool for fitting and setting an underwater tool on the core support plate, comprising a cylinder having an extension part divided into two forks at a lower part, and a pair below the lower extension part of the cylinder. End plates of the core support plate are arranged to face each other at an interval wider than the pin diameter of the core support plate pin, and one of the end plates is attached to the lower end of the lever swingably supported by one lower extension of the cylinder. , The other end plate is rotatably connected to the lower ends of the levers swingably supported by the other lower extension, and the upper end of one lever is connected to the lower end of the arm connected to the piston rod of the cylinder. Rotatably connected A.

[0012]

According to the present invention constructed as described above, the core support plate pin is pinched by the pair of end plates arranged below the cylinder, that is, fixed to the underwater tool in the same manner as the conventional grooved lug. The core support plate pin fitting device is attached to the core support plate pin, and in this state, the cylinder is operated to move the piston rod, whereby the arm connected to the piston rod and one lever connected to the arm. The end plate of the end plate connected to the tip of this lever via the outer surface of the core support plate pin, and by reaction of this, one extension of the cylinder is pressed against the outer surface of the support plate pin to support the core. It is possible to fix the core support plate pin fitting tool in a state of being firmly crimped and clamped to the plate pin, and at the same time perform centering.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fitting tool for core support plate pins according to the present invention for a plug auxiliary tool which is one of underwater tools will be described below with reference to the drawings.

The core support plate pin fitting of the present invention is applied to, for example, a plug auxiliary tool which is one of underwater tools,
This plug auxiliary tool is for seating on the enlarged diameter flange portion of the control rod guide tube on the core support plate to prevent the fixing pin of the core support plate plug from falling off.

FIG. 5 shows an overall view of the plug auxiliary tool 1 as an underwater tool.
A grip guide 3 is provided on the upper part, and this grip guide 3 plays a role as a guide when the auxiliary tool 1 passes through the upper lattice plate and reaches the core support plate 2 when passing through the upper lattice plate. The grid guide 3 is connected to the upper end of a column 4 and the lower end of a wire rope 5 from an auxiliary hoist or the like of a fuel exchanger (not shown). Through the wire rope 5, the auxiliary hoist of the platform on the furnace or the like can be used to move the plug auxiliary tool 1 up and down.

Further, substantially parallel to the vertically mounted support column 4,
A water pressure tube 6 is arranged as a water supply / drain pipe from a pump facility on the furnace.

The lower ends of the column 4 and the hydraulic tube 6 are
It is held by an upper plate 8 that is locked to the floor plate 7 via a pillar. A cylinder 9 for operating the rack 18 is arranged on the upper surface of the floor plate 7, and the cylinder 9 is fixed in a state of being pressed in the direction of the floor plate 7 by a push plate 10.

The body 11 of the plug auxiliary tool 1 having the floor plate 7, the cylinder 9 and the like housed therein is formed in a cylindrical and tapered shape, and a conical portion or step portion for seating is formed in the middle thereof. It is provided. Further, even-numbered arc-shaped guard rods 12 are integrated and connected by welding or the like from the tapered tip to form a cap-shaped bird cage, and the guard 12 plays a role of a guard at the time of attaching / detaching or descending. Has been like.

Further, the fixing pin 29 of the core support plate plug
A box-shaped bucket 13 is provided for accommodating the fixing pin 29 when (see FIG. 7) falls off, and the bucket 13 is arranged so as to open to the back surface of the core support plate 2. The bucket 13 is fixed to the tip of the connecting rod 16. The base end of the connecting rod 16 is fixed to the lower end of a shaft 15 rotatably supported via a bearing 14. A pinion 17 is fixed to the upper portion of the shaft 15.

On the other hand, a rack 18 is engraved on the piston rod of the cylinder 9, and the rack 18 is supported by a support guide 19 so that it can move back and forth and cannot move up and down. Pinion 17
An intermediate pinion 20 that meshes with the rack 18 and the pinion 17 is arranged between the and.

As a result, the piston rod and hence the rack 18 move back and forth as the cylinder 9 is driven, and the back and forth motion of the rack 18 rotates the intermediate pinion 20.
The rotation of the intermediate pinion 20 causes the pinion 17, and thus the bucket 13, to rotate in the horizontal direction.

On the outside of the body 11 of the plug auxiliary tool 1, a core support plate pin fitting 21 is fixed,
A core support plate pin 22 is fixed to the upper surface of the core support plate 2 in a state of vertically rising upward.
The grooved lug portion of the sleeve 23 is inserted in the.

FIG. 6 is a view taken along the line AA of FIG. 5, and a pointer 24 is fixed to the upper end of the shaft to which the intermediate pinion 20 is fixed. The pointer 24 is for indicating the rotating position of the bucket 13, and the rotating position of the bucket 13 can be detected by visually observing the pointer 24 from above the furnace with a telescope or the like. There is.

As described above, the two pinions 17 and 20 rotate in synchronization with the back and forth movement of the rack 18 driven by the cylinder 9, and the pointer 24 is provided on the shaft to which one of the pinions 20 is fixed. Since the base end of the connecting rod 16 whose one end is connected to the bucket 13 is connected to the shaft to which the other pinion 17 is fixed, the bucket 13 and the pointer 24 rotate in synchronization, whereby the position of the pointer 24 is adjusted. The rotating position of the bucket 13 can be detected by visually observing.

In the lower right part of FIG. 6, the arrangement of the core support plate plugs provided in the core support plate 2 is shown. That is, the large hole 25 in the center is the opening hole 25 through which the guide tube of the neutron measuring tube is opened, and the four small holes 26 are the plug holes provided in the core support plate 2, and the plug holes 26 are It is plugged in and blindly plugged. This plug hole 26
Originally, it is provided to limit the core flow rate, and by using this plug hole 26, the core flow rate can be bypassed.

FIG. 7 shows an overall view of the core support plate plug 27.

A plug main body 28 of a core support plate plug 27 is inserted into each plug hole 26 of the core support plate 2, and a spindle 29 is spring-supported from a valve seat portion of the plug main body 28 to project upward. There is. In addition, this spindle 2
9 is attached to a fixing pin 29 that extends downward through the hollow portion of the plug main body 28 and removes the main body 27 from the tip thereof. When the main body 28 of the core support plate plug 27 is inserted into the plug hole 26 and the spindle 29 is pressed against the force of the spring, the fixing pin 29 rotates from the housed state and engages with the lower end of the plug hole 26. To do. In this state, even if the spindle 29 returns to its original position by the spring force, the fixing pin 29 engages with the core support plate 2 from the back side of the core support plate 2 and closes the plug hole 26 of the core support plate 2 with the spring force. It is like this.

By rotating the bucket 13, the bucket 13 is positioned at a position corresponding to the fixing pin 29 and opens below this, so that the damaged fixing pin 29 can be accommodated in the bucket 13. There is. The plug body 27 is pulled out by chucking the stepped portion at the apex of the spindle 28 and pulling it up. At this time, the fixing pin 29 bends in the elastic range,
Although it can be taken out together with the spindle 28 and the plug body 27 through the plug hole 26 provided in the core support plate 2, if the elasticity is deteriorated, it may be damaged and fall downward. At this time, since the bucket 13 is arranged below this, the bucket 13 can be welcomed.

FIGS. 1 to 4 show a core support plate pin fitting 21 fixed to the core support plate 2. As described above, the core support plate pins 22 are vertically erected on the core support plate 2, and the core support plate pin fittings 21 are fitted to the core support plate pins 22.

The support plate pin fitting 21 is provided with a fluid pressure cylinder 31 having a piston 30 housed therein, and a blind plug 32 is screwed into an upper end opening of the cylinder 31, and the both 31, 32. An O-ring 33 is interposed between the cylinders to prevent the contents in the cylinder 31 from leaking to the outside. In the center of the blind plug 32, a screw hole 32a for joining a water supply tube is provided. The screw hole 32a is
It is connected to a pump facility (not shown) on the furnace.

A spring 34 for urging the piston 30 upward is also housed inside the cylinder 31 of the support plate pin fitting tool 21, and the elastic force of the spring 34 causes the piston 30 to move.
Normally rises as shown in FIGS. Further, a mounting hole 35 in which a female screw is engraved is formed on the peripheral wall of the cylinder 31, and the body 11 of the plug auxiliary tool 1 is fastened with a bolt (not shown) through the mounting hole 35.

The upper end of an arm 37 is rotatably pin-connected to the lower end of a piston rod 36 connected to the piston 30 of the cylinder 31, and the upper end of a lever 38 is rotatably pin-connected to the lower end of the arm 37. Has been done. The lever 38 is rotatably supported at one end thereof by a pin 39 on one extension 31a of the cylinder 31 which is divided into two forks, and an end plate 40 is rotatably supported by a pin on the lower end of the lever 38. Is linked to.

As shown in FIG. 2, a pair of arms 37 are provided, and the extension 31 of the cylinder 31 is provided.
It is located in the opening provided with a so that this swing is not hindered.

An upper end of a lever 41 is rotatably supported by a pin connection on an extension portion 31b of the other cylinder 31 which is divided into two legs, and an end plate 42 is rotatably supported by a pin connection on the lower end of the lever 41. Is linked to.

Here, the both end plates 40, 42 are arranged so as to face each other, and the distance between them is set larger than the diameter of the core support plate pin 22.

FIG. 4 shows that the core 31 is pressed against the elastic force of the spring 34 to lower the piston 31 against the elastic force of the spring 34 from the state where the core support plate pin fitting 21 is attached to the core support plate pin 22 to support the core. 1 shows a state in which a plate pin fitting tool 21 is fitted to a core support plate pin 22.

Piston 3 of core support plate pin fitting 21
When 0 descends against the elastic force of the spring 34, the arm 37
Oscillates to push the upper end of the lever 38 outward, which causes the lever 38 to oscillate in the clockwise direction in FIG. 1 so that the abdomen of the end plate 40 connected to this lower end moves to the outer surface of the core support plate pin 22. Press on. Then, the plug assisting tool 1 moves to the left in FIG. 1 relative to the core support plate pin 22 by its reaction force, and the outer surface of the core support plate pin 22 is extended by the extension 31b of the cylinder 31 that is divided into two forks. The core support plate pin 22 is sandwiched between the core support plate pin 22 and the core support plate pin 22. At this time, the end plate 42 separates from the core support plate pin 22.

Next, the operation when the core support plate pin fitting tool 22 is fixed to the plug auxiliary tool 1 will be described.

First, a pump is installed on the furnace. As this pump, for example, although not shown, a high-pressure low-capacity reciprocating pump, such as an air-operated diaphragm system, is provided on the pure water tank. Switch and open by connecting to a pure water tank.

Subsequently, the grid guide 3 and the plug auxiliary tool 1 are combined to connect the tube 6 of the auxiliary tool 1 to the pump, and the core support plate pin fitting tool 21 fixed to the outside of the plug auxiliary tool 1 Another tube 43 is connected to the cylinder 31 of. Here, the same pipe joint as the former is used for the end on the upper side of the furnace. Although not shown in the figure, a set of tools for pulling out the core support plate plug is installed and placed on the furnace.

When the fuel group and the fuel support are moved to look under the upper lattice plate, the core support plate pins 22 sandwiched by the grooved lugs on the core support plate 2 and the core support plate pins 22 are held. The flanged sleeve 23 is visible.

In this state, the auxiliary grid 1 and the grid guide 3 are integrally hung between the upper grid plates by an auxiliary hoist or the like provided on the service platform.

Eventually, the core support plate pin fitting 21 reaches the top of the sleeve 23, and as shown in FIG. 1, the core support plate pin fitting 21 is similar to a conventional grooved lug. Around the periphery of the pin 22. At this position, the body 11 of the plug auxiliary tool 1 is seated on the sleeve 23.
At this time, as shown in FIG. 4, water pressure is applied to the cylinder 31.
The lever 38 is swung so that its lower end is directed toward the support plate pin 22, and the abdomen of the end plate 40 connected to this lower end is pressed against the outer surface of the support plate pin 22. At the same time, The body 11 is pulled toward the support plate pin fitting tool 21 through the cylinder 31 by the reaction force of and the outside of the core support plate pin 22 is pushed by the extension portion 31b of the other cylinder 31 which is divided into two pairs. Do this by: Thus, the support plate pin 22 is firmly pressed by the support plate pin fitting device 21 so that the attachment point of the auxiliary device to the sleeve 23 is fixed and the positioning is performed.

At this point, water pressure is applied to the cylinder 9 of the plug auxiliary tool 1 to push out the rack 18 to rotate the intermediate pinion 20, and at the same time rotate the pinion 17 meshing with the intermediate pinion 20. Then, the connecting rod 16 connected to the lower end of the shaft 15 is rotated, and the bucket 13 at this tip is paid out. Then, the lateral hole of the sleeve 23, which is assumed in advance, is passed through and stopped at a fixed position indicated by the pointer 24, that is, a position where the upper opening of the bucket 13 corresponds to the fixed pin 29 of the core support plate plug.

Next, using a core support plate plug pulling tool (not shown), the stepped portion at the tip of the spindle 28 of the core support plate plug is chucked to pull out the plug body 27. here,
Even if the fixing pin 29 is not bent and is damaged and drops, the fixing pin 29 can be received by the bucket 13 to prevent the falling.

After that, the upper side of the tube 6 of the cylinder 9 of the plug auxiliary tool 1 is reconnected by an electromagnetic valve or the like, and the bucket 13 is pulled back by the spring restoring force in the cylinder 9 (not shown). On the other hand, the tube 43 of the plug fitting 1 is also connected by an electromagnetic valve or the like, reduced to atmospheric pressure in the deionized water tank, and returned to the original state as shown in FIG.

Subsequently, the wire rope 4 is wound by the auxiliary hoist, and the plug auxiliary tool 1 is pulled up together with the grid guide 3.

The above is the end of the work.

The present invention can be used not only in the above-mentioned embodiments but also in all underwater tools which may increase in the future. For example, underwater tools may increase the types of specific work and may increase inspections. That is, for maintenance, the nuclear reactor needs remote control unlike other models, and moreover, it is necessary to perform sufficient follow-up with respect to aging and the like.

Further, the handling of the underwater tool is gradually improved, and it is desirable that at least the position shift does not occur during use. Since it is not fixedly used underwater, it is necessary to consider using core support plate pins and the like as underwater tools.

[0051]

Since the present invention has the above-mentioned structure,
The orientation and centering of the underwater tool, which can be easily fitted to the core support plate pins and has the function of being installed on the core support plate to perform work and inspection, can be more accurately and centered. It is strong and can be done without loosening,
This makes it possible to cope with the expansion of the functions of the underwater tool on the core support plate.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of a core support plate pin fitting tool according to the present invention when a cylinder is not in operation.

FIG. 2 is a right side view of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is a front view of a part of the support plate pin fitting device when the cylinder is operated.

FIG. 5 is an overall view of a plug auxiliary tool (underwater tool) including a support plate pin fitting tool.

6 is a view taken along the line AA of FIG.

FIG. 7 is a cross-sectional view of a core support plate plug.

[Explanation of symbols]

 1 Plug Auxiliary Tool (Underwater Tool) 2 Core Support Plate 9 Cylinder 11 Body 13 Bucket 17,20 Pinion 18 Rack 21 Core Support Plate Pin Fitting Tool 22 Core Support Plate Pin 27 Plug Body 29 Fixing Pin 30 Pistons 31a, 31b Same Extension part 36 Piston rod 37 Arm 38,41 Lever 40,42 End plate

Claims (1)

[Claims] 1. A core support plate pin fitting for fitting an underwater tool on a core support plate pin projecting from an upper surface of a core support plate of a boiling water nuclear reactor to install an underwater tool on the core support plate, A cylinder having an extension part that is divided into two forks is provided in the lower part, and a pair of end plates are arranged below the lower extension part of the cylinder so as to face each other with a width wider than the pin diameter of the core support plate pin, respectively. This one end plate is swingably supported on one lower extension of the cylinder, and is attached to the lower end of the lever.
The other end plate is rotatably connected to the lower ends of levers swingably supported by the other lower extension, and the upper end of one lever is rotated to the lower end of an arm connected to the piston rod of the cylinder. A fitting tool for core support plate pins, characterized by being freely connected.