JPH10148691A - Nozzle plug handler for nuclear reactor pressure vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the inspection and repair of piping outside a pressure vessel nozzle while closing the inner surface part of the nozzle without removing the reactor water. SOLUTION: A nozzle plug 30 is inserted into a nozzle 9a (9b) being secured to the side part of a reactor pressure vessel 2 in the horizontal direction by means of a plug inserter 13 thus closing the inside of the nozzle 9a, 9b. The plug inserter 13 comprises a member 28 for stopping a suspension wire 14, a unit 23 for fixing a nozzle plug 30 removably, and means 15 for moving the unit 23 fixed with the nozzle plug 30 in the inserting direction of the nozzle plug 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to closing a pressure vessel nozzle provided in a reactor pressure vessel (RPV) during use of a boiling water reactor (BWR). The present invention relates to a reactor pressure vessel nozzle plug handling device which enables repair and inspection of piping outside the nozzle.

[0002]

2. Description of the Related Art Some BWRs are constructed as shown in FIG. As shown in FIG. 10, the reactor 1 has a sealed cylindrical RPV 2 installed upright in the longitudinal direction thereof, and a steam dryer 3 in the RPV 2 from above.
The steam-water separator 4, the fuel assemblies 5, 5, ..., the control rods 6, 6, ... and the control rod drive mechanisms (CRD) 7, 7, ... are arranged and configured.

[0003] The fuel assembly 5 is a columnar member in which uranium dioxide is sealed, and these are arranged at predetermined intervals in the longitudinal direction. Control rods 6 and 6 movable in the longitudinal direction are provided in the gaps between the fuel assemblies 5.
Are inserted, and these control rods 6, 6 ... are rods 7a, 7
are configured to be movable in the vertical direction by control rod driving mechanisms 7, 7,.

The RPV 2 is filled with water 8 above the fuel assemblies 5, 5,..., And the water 8 has a function of a moderator and a coolant of the nuclear reactor 1. Also, RPV
2, water level instrumentation nozzles 9a and 9b for instrumenting the water level of the water 8 are provided.
a and 9b constantly monitor the water level during the operation of the reactor to maintain safe operation of the reactor.

The heat generated by the fission of uranium dioxide in the fuel assemblies 5, 5... The water 8 boils and is separated into steam and water by the steam separator 4 and dried by the steam dryer 3.
Through a, it is sent to a turbine (not shown).

The control rod 6 controls the output of the nuclear reactor 1 by nuclear fission by inserting and removing the control rod 6 from the reactor core by the control rod drive mechanism 7. The control rod drive mechanism 7 is moved up and down by the hydraulic pressure of a rod 7a provided in a cylindrical housing (pressure penetrating housing) 7b extending from the lower part of the RPV 2.

FIG. 11 is an enlarged sectional view showing the water level instrumentation nozzle of FIG. As shown in FIG. 11, a stainless steel overlay (buttering) 10 is formed on the inner surface of the RPV 2 by welding. Each water level instrumentation nozzle 9a, 9b is a RPV
2 is usually attached by welding with a welding member 11 which is a heat-resistant and corrosion-resistant alloy.

[0008]

However, if any trouble occurs in piping outside the nozzles provided on the wall of the RPV 2 such as the water level instrumentation nozzles 9a and 9b due to any cause, repair and inspection are not performed early. In this case, it is assumed that stress corrosion cracking progresses and damages occur. When the stress corrosion cracking occurs, there is a possibility that the reactor water in the RPV 2 leaks, and there is an undesirable problem.

Further, each of the water level instrumentation nozzles 9a and 9b
Inspection and repair work was extremely difficult because it was installed several tens of meters below the water surface in PV2.

The present invention has been made in view of the above circumstances, and when repairing and inspecting pipes outside the pressure vessel nozzle, it is possible to close the nozzle inner surface and without draining the reactor water. An object of the present invention is to provide a reactor pressure vessel nozzle plug handling device.

[0011]

In order to solve the above-mentioned problems, a first aspect of the present invention is to insert a nozzle plug into a nozzle horizontally fixed to a side of a reactor pressure vessel by a plug insertion device. A reactor pressure vessel nozzle plug handling device for closing the inside of the nozzle by means of the plug insertion device, wherein the plug insertion device comprises: a locking member to which a hanging wire is locked; And a plug moving means for moving a plug fixing tool to which the nozzle plug is fixed in a direction in which the nozzle plug is inserted.

A second aspect of the present invention is a reactor pressure vessel nozzle plug handling apparatus having a nozzle horizontally fixed to the side of the reactor pressure vessel closed with a nozzle plug, and having a plug removing device for pulling out the nozzle plug. The plug removing device includes a locking member to which the hanging wire is locked,
A plug fixing device for detachably fixing the nozzle plug, and plug moving means for moving the plug fixing device fixing the nozzle plug in a direction in which the nozzle plug is pulled out.

A third aspect of the present invention is characterized in that the plug moving means according to the first or second aspect is a rodless cylinder.

According to a fourth aspect of the present invention, in the nozzle plug according to the first or second aspect, a plurality of different seal members are attached along the axial direction of the nozzle insertion portion.

According to a fifth aspect of the present invention, in the reactor pressure vessel nozzle plug handling device according to the second or third aspect, when the nozzle plug is pulled out from the nozzle, the rodless cylinder is driven to move the piston portion of the reactor pressure vessel into the reactor pressure vessel. It is characterized in that the nozzle plug is pressed against a wall surface and the nozzle plug is pulled out by the reaction force.

A sixth aspect of the present invention is characterized in that the rodless cylinder according to the third aspect is driven by supplying hydraulic pressure.

A seventh aspect of the present invention is a reactor pressure vessel nozzle plug handling apparatus for closing a nozzle interior by inserting a nozzle plug into a nozzle horizontally fixed to a side portion of the reactor pressure vessel with a plug insertion device. An arc plate formed in an arc concentric with the outer diameter of the shroud on the outer wall surface of the shroud containing the reactor core and installed in the reactor pressure vessel,
And a bottom plate fixed to the bottom of the arc plate, and a shielding plate for shielding a radiation dose is provided.

An eighth aspect of the present invention is characterized in that the shielding plate according to the seventh aspect is formed in an L-shaped cross section by an arc plate and a bottom plate.

A ninth aspect of the present invention is characterized in that an opening / closing lid for shielding a radiation dose from below is attached to the bottom plate of the shielding plate according to the seventh or eighth aspect.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional front view showing a nozzle plug and a plug insertion device in an embodiment of a reactor pressure vessel nozzle plug handling device according to the present invention, FIG. 2 is a partial sectional plan view of FIG. 1, and FIG. FIG. 2 is an enlarged sectional view showing the nozzle plug of FIG. 1. Note that the configuration of the RPV is the same as that shown in FIG. 10 and will be described using the same reference numerals.

The reactor pressure vessel nozzle plug handling device of the present embodiment comprises a plug insertion device 13 for inserting the nozzle plug 30 into the water level instrumentation nozzle 9a or 9b, and a nozzle inserted into the water level instrumentation nozzle 9a or 9b. Plug 30
5 and a shielding device 70 shown in FIG.

As shown in FIG. 1, the nozzle plug 30 is fixed to the plug insertion device 13 between the RPV 2 and the shroud 12 containing the core in which the fuel assembly 5 is loaded, and is not shown. Hanging wire 14 from refueling machine
Hangs down to the position of the water level instrumentation nozzle 9a or 9b.

As shown in FIGS. 1 and 2, the plug insertion device 13 incorporates two rodless cylinders 15 as plug moving means below, and these rodless cylinders 15 each have a pair of water supply ports 16a. , 16b are provided, and the moving table 17 is fixed. In the vicinity of each rodless cylinder 15, a linear guide 18 is provided in parallel with the rodless cylinder 15.

Then, by supplying water to the water supply ports 16a and 16b to drive the rodless cylinder 15, the piston portions of the rodless cylinder 15 move along with the moving table 17 along the two linear guides 18, respectively. Move horizontally gradually.

In the center of the plug insertion device 13,
Two cylinders 19 are attached, and a cushioning member 20 formed of tetrafluoroethylene resin or the like is fixed to a tip of a piston rod of the cylinder 19 by a tightening bolt 21. The cylinder 19 has a pair of water supply ports 2.
2a, 22b are provided, and these water supply ports 22a, 2b are provided.
By supplying water to 2b and driving the cylinder 19, the piston rod moves toward the outer wall surface of the shroud 12, and the buffer member 20 is pressed against the outer wall surface of the shroud 12.

Further, at the end of the plug insertion device 13 on the side opposite to the side where the cylinder 19 is mounted, similarly to the cylinder 19, it is molded from an ethylene tetrafluoride resin or the like.
The two cushioning members 20 abutting on the inner wall surface of the
It is fixed by 1.

A plug fixture 23 is fixed to the upper surface of the moving table 17. The plug fixture 23 has a cylinder 24, and a stopper 26 is attached to the tip of a piston rod 25 of the cylinder 24. Is provided with an engagement pin 27. A locking member 28 to which the hanging wire 14 is hooked is fixed to an upper portion of the cylinder 24.

The cylinder 24 is provided with a pair of air supply ports 29a and 29b.
The engagement pin 27 is moved downward via the piston rod 25 and the stopper 26 by supplying air to the a and 29b to drive the cylinder 24.

On the other hand, as shown in FIG. 3, the nozzle plug 30 is formed in a substantially cross shape in a vertical cross section, and includes a contact plate 31 and a nozzle insertion portion 32 formed at the front of the contact plate 31. A locked portion 33 formed at the rear of the contact plate 31 is provided integrally. At the upper end of the contact plate 31, the air supply hose 3
4, a pipe joint 34a for supplying air pressure is attached, and a through hole 35 communicating with the pipe joint 34a is continuously formed in an L-shape inside the contact plate 31 and the nozzle insertion portion 32. ing.

The nozzle insertion portion 32 is fitted on the outer periphery side of the base portion 36 with spacers 38, 39 formed in a cylindrical shape via a plurality of O-rings 37, and in the axial direction of these spacers 38, 39, respectively. Tube seals 40, 40 made of rubber or the like, and metal rings 41 fixed to both longitudinal ends of these tube seals 40, 40 are provided. The spacers 38 and 39 are configured to be engageable with each other at the axial ends. A lip seal 42 is fitted between the spacer 38 and the spacer 39 between the tube seals 40, 40, and the two tube seals 40, 40 and the lip seal 42 are fitted. It has a structure to seal.

The base 36 and the spacers 38, 39
Are formed with communication holes 43, 43 communicating with the through holes 35, respectively.
When air is supplied through a, the through hole 35 and the communication hole 4
The air is supplied to the inner peripheral side of the tube seals 40, 40 through the tubes 3, 43, and supplied by the supplied air.
By bulging the outer peripheral direction, when the nozzle insertion portion 32 of the nozzle plug 30 is inserted into the water level instrumentation nozzle 9a or 9b, it is possible to reliably seal the inside thereof.

To assemble the nozzle insertion portion 32, the spacers 38 and 39 to which the tube seals 40 and 40 and the lip seal 42 are attached are assembled together with the O-ring 37 into the base 36, and a head is attached to the tip of the base 36. By screwing 44, each member is integrated.

On the other hand, the locked part 33 is
An engagement hole 45 into which the third engagement pin 27 is inserted is formed. By supplying water to the water supply ports 29a and 29b of the cylinder 24 and driving the cylinder 24, the piston rod 25 and the stopper 26 are formed. The nozzle pin 30 is attached to the plug insertion device 13 by moving the engaging pin 27 downward through the through hole and inserting it into the engaging hole 45.

Next, the operation of the plug insertion device 13 and the nozzle plug 30 will be described.

The nozzle plug 30 is attached to the plug insertion device 13 and integrated therewith. The nozzle plug 30 is hung from the hoist of the refueling machine by the hanging wire 14, and the water level instrumentation nozzle 9a
Or it is moved to the vicinity of 9b. This state is photographed by an underwater TV camera (not shown), and while the image is monitored by a monitor television set on the furnace, the nozzle plug 30 is gradually inserted into the water level instrumentation nozzle 9a or 9b.

That is, after an integrated plug insertion device 13 and nozzle plug 30 are hung near the water level instrumentation nozzle 9a or 9b, water is supplied to the water supply ports 22a and 22b of the cylinder 19, 19 is driven. When the cylinder 19 is driven, the piston rod moves toward the outer wall surface of the shroud 12, and the cushioning member 20 contacts the outer wall surface of the shroud 12, and then the cushioning member 20 presses the outer wall surface of the shroud 12. The two cushioning members 20 fixed on the side opposite to the mounting side of the cylinder 19 are pressed against the inner wall surface of the RPV 2. As a result, the plug insertion device 13 makes the outer wall surface of the shroud 12
It is supported between the inner wall surface of PV2.

Next, water is supplied to the water supply ports 16a and 16b of the rodless cylinder 15 to
By driving the piston 5, its piston part gradually moves horizontally along the two linear guides 18 together with the moving table 17.

Then, the nozzle plug 30 fixed to the moving table 17 via the plug fixing tool 23 is moved to the moving table 17.
, And is gradually inserted into the water level instrumentation nozzle 9a or 9b.

Then, as shown in FIG. 4, when the nozzle plug 30 is inserted into the inner wall surface of the RPV 2 until the contact plate 31 comes into contact therewith, air is supplied from the air supply hose 34 through the pipe joint 34a, and the air is penetrated. Hole 35, communication hole 43,
The tube seals 40, 40 are fed into the inner peripheral side of the tube seals 43 via 43, and the tube seals 40, 40 are bulged in the outer peripheral direction to seal between the water level instrumentation nozzle 9 a or 9 b and the nozzle insertion portion 32. Further, the air supply port 2 of the cylinder 24
The cylinder 24 is driven by supplying air to 9a and 29b, and the engaging pin 27 is moved upward through the piston rod 25 and the stopper 26. As a result, the engagement state of the nozzle plug 30 with the engagement hole 45 is released, the plug insertion device 13 can be separated from the nozzle plug 30, and the plug insertion device 13 is lifted above the furnace.

FIG. 5 is a partial sectional front view showing a nozzle plug and a plug removing device in an embodiment of the reactor pressure vessel nozzle plug handling device according to the present invention, and FIG. 6 is a partial sectional plan view of FIG.

The plug removing device 50 is shown in FIGS.
As shown in the figure, two rodless cylinders 51 as plug moving means are incorporated below, and a pair of water supply ports 52a and 52b are respectively provided in these rodless cylinders 51.
Are provided, and the mount 53 is fixed.
Then, by supplying water to the water supply ports 52a and 52b to drive the rodless cylinder 51, the piston portions thereof respectively move horizontally.

At the ends of the pistons of these rodless cylinders 51, buffer members 54 formed of, for example, tetrafluoroethylene resin are fixed. A plug fixture 55 is fixed to the upper surface of the mounting base 53, and the plug fixture 55 has a cylinder 56.
A stopper 58 is attached to the tip of the piston rod 57 of the sixth embodiment, and an engagement pin 59 is fixed to the lower surface of the stopper 58.

Further, the cylinder 56 is provided with a pair of air supply ports 60a and 60b.
When the cylinder 56 is driven by supplying air to a and 60b, the engagement pin 59 moves downward via the piston rod 57 and the stopper 58. In addition, two eye bolts 61 as a locking member for hanging the plug removing device 50 by the hanging wires 14 are mounted on the mounting base 53.

Next, the operation of the plug removing device 50 will be described.

The plug removing device 50 is hung from the hoist of the refueling machine by a hanging wire, and the nozzle plug 3
Move to near 0. When air is supplied to the air supply ports 60 a and 60 b of the cylinder 56 to drive the cylinder 56, the engagement pin 59 moves downward via the piston rod 57 and the stopper 58. As a result, the engaging pin 59 fits into the engaging hole 45 of the nozzle plug 30, the plug removing device 50 is fixed to the nozzle plug 30, and both are integrated.

Next, after the air sent into the inner peripheral side of the tube seals 40 and 40 of the nozzle plug 30 shown in FIG. 3 is extracted and the diameter of the nozzle insertion portion 32 is returned to a normal diameter, the rodless cylinder 51 Water supply ports 52a, 52b
When the rodless cylinder 51 is driven by supplying water thereto, the piston portions of the rodless cylinder 51 move toward the inner wall surface of the RPV 2, respectively, and the buffer member 54 is pressed against the inner wall surface of the RPV 2. Due to the reaction force of this pressing force, the nozzle plug 30 can be gradually removed from the water level instrumentation nozzle 9a or 9b and removed. Thereafter, the plug removing device 50 integrated with the removed nozzle plug 30 is lifted above the furnace.

FIG. 7 is a partial cross-sectional side view showing a shielding device in an embodiment of the reactor pressure vessel nozzle plug handling device according to the present invention, FIG. 8 is a front view showing the shielding device of FIG. 7, and FIG. It is a perspective view which shows the attachment state of the shielding device of FIG.

As shown in FIG. 7, after the nozzle plug 30 is inserted and mounted in the water level instrumentation nozzle 9a or 9b, a shielding device 70 is mounted on the outer wall surface of the shroud 12. The shielding device 70 has an L-shaped cross section, an arc plate 71 formed in an arc concentric with the outer diameter of the shroud 12, a bottom plate 72 fixed to the bottom of the arc plate 71, and a bottom plate 72. Attached bottom plate 72 and RPV
And an opening / closing lid 73 for shielding a gap between the inner wall 2 and the inner wall.

The arc plate 71 and the bottom plate 72 are thick structural members whose periphery is covered with a thin plate of stainless steel and in which lead is cast. The opening / closing lid 73 is rotatable about a shaft 74, and an eyebolt 75 to which the hanging wire 14 is locked is attached near the tip. The opening / closing lid 73 is opened / closed about the shaft 74 by operating the hanging wire.

As shown in FIGS. 8 and 9, the shielding device 70 is provided with a suspension plate 77 via two connecting rods 76 at the top.
Are connected, and the suspension plate 77 is fixed to the connecting rod 76 by tightening the respective tightening nuts 78. A positioning guide 79 is provided on the upper part of the connecting rod 76 so as to fit between the brackets 12 a attached to the upper part of the shroud 12. Further, the shielding device 70 and the suspension plate 77 are connected by a connecting member 80 to improve the strength. 8 and 9, the opening / closing lid 73 is omitted, and in FIG. 7, reference numeral 81 denotes a jet pump.

Next, a description will be given of a case where the external piping of the RPV 2 is repaired and improved by using the reactor pressure vessel nozzle plug handling device of the above embodiment.

First, after stopping the reactor 1, the upper lid of the RPV 2 is removed. Thereafter, the steam dryer 3 and the shroud head are moved to the equipment storage pool by an overhead crane or the like. Next, suspending wire 1
4 and the nozzle plug 30 is attached to the plug insertion device 13 and the one integrated therewith is hung down.
Move to the vicinity of a or 9b.

This state is photographed by an underwater TV camera (not shown), and while the image is monitored by a monitor television set on the furnace, the nozzle plug 30 is gradually inserted into the water level instrumentation nozzle 9a or 9b. Further, after the shielding device 70 is similarly suspended and installed on the outer wall of the shroud 12, the external piping of the water level instrumentation nozzle 9a or 9b is repaired and improved.

As described above, according to the above-described embodiment, the nozzle plug 30 is attached to the plug insertion device 13 and integrated therewith. To the rodless cylinder 15 and cylinder 1
9, the nozzle plug 3 is attached to the water level instrumentation nozzle 9a or 9b provided in the horizontal direction of the RPV 2.
0, so that the water level instrumentation nozzle 9a
Or 9b can be reliably and easily closed.

Further, a plurality of different seal members along the axial direction of the nozzle insertion portion 32 are used as the tube seals 40 and 40.
By providing the lip seal 40 and the lip seal 42, it is sealed by two kinds of different seal members, and it is possible to repair and improve the external piping without draining the reactor water in the RPV 2.

Furthermore, by driving the rodless cylinder 51 and the cylinder 56 of the plug removing device 50, the nozzle plug 30 can be reliably and easily removed from the water level instrumentation nozzle 9a or 9b underwater remotely. And the piston part of the rodless cylinder 51 is R
It moves in the direction of the inner wall surface of PV2, and the cushioning member 54
Since the nozzle plug 30 is removed from the water level instrumentation nozzle 9a or 9b by a reaction force of the pressing force, the nozzle plug 30 can be removed at a narrow portion.

Since the plug insertion device 13 and the plug removal device 50 are provided with the rodless cylinder 15 and the rodless cylinder 51 without a piston rod, the stroke becomes short, and the mounting of the nozzle plug 30 in a narrow portion can be performed. Removal becomes possible. Then, by using water pressure as a drive source of the rodless cylinder 15 and the rodless cylinder 51, the insertion and withdrawal operation of the nozzle plug 30 can be performed gradually.

Further, since the positioning guide 79 is fitted between a plurality of brackets 12a mounted on the upper part of the shroud 12 and the shielding device 70 is mounted on the outer wall surface of the shroud 12, a high radiation dose at the upper position of the shroud 12 is shielded. can do. Further, since the shielding device 70 is formed in an L-shaped cross section, it can shield against a radiation dose from below. And the shielding device 70
Since the opening / closing lid 73 is attached to the bottom plate 72, an even higher shielding effect can be obtained with respect to the radiation dose from below.

[0060]

As described above, according to the first aspect of the present invention,
According to the reactor pressure vessel nozzle plug handling device, which inserts a nozzle plug into a nozzle horizontally fixed to the side of the reactor pressure vessel with a plug insertion device and closes the inside of the nozzle, comprising a plug insertion device Comprises a locking member to which the suspension wire is locked, a plug fixing device for detachably fixing the nozzle plug, and plug moving means for moving the plug fixing device fixing the nozzle plug in the nozzle plug insertion direction. Thus, the nozzle can be reliably and easily closed by underwater remote operation when the reactor water is full. As a result, repair and improvement of the external piping of the nozzle can be easily performed, and the operation rate of the nuclear reactor can be improved.

According to a second aspect of the present invention, a nozzle fixed to the side of the reactor pressure vessel in a horizontal direction is closed by a nozzle plug, and a reactor pressure vessel nozzle plug handling apparatus having a plug removal device for pulling out the nozzle plug. Wherein the plug removing device is configured to move the locking member to which the hanging wire is locked, the plug fixing tool for detachably fixing the nozzle plug, and the plug fixing tool fixing the nozzle plug in the direction of pulling out the nozzle plug. With the provision of the plug moving means, the nozzle plug can be reliably and easily pulled out by remote control underwater.

According to the third aspect, since the plug moving means according to the first or second aspect is a rodless cylinder, the stroke becomes short, and the attachment and detachment of the nozzle plug at a narrow portion becomes possible.

According to the fourth aspect, since the nozzle plug according to the first or second aspect is provided with a plurality of different sealing members along the axial direction of the nozzle insertion portion, the sealing effect is enhanced and the reactor pressure is increased. Repair and improvement of external piping can be performed without draining reactor water in the vessel.

According to the fifth aspect, in the reactor pressure vessel nozzle plug handling device according to the second or third aspect, when the nozzle plug is pulled out from the nozzle, the rodless cylinder is driven to move the piston portion of the reactor pressure vessel. By pressing the nozzle plug against the inner wall surface and pulling out the nozzle plug by the reaction force, the work of pulling out the nozzle plug in the narrow portion becomes possible.

According to the sixth aspect, when the rodless cylinder according to the third aspect is driven by the supply of water pressure, the insertion and withdrawal operations of the nozzle plug can be performed gradually.

According to a seventh aspect of the present invention, there is provided a reactor pressure vessel nozzle plug handling device for inserting a nozzle plug into a nozzle horizontally fixed to a side portion of a reactor pressure vessel with a plug insertion device and closing the inside of the nozzle. There is provided on the outer wall surface of the shroud, which is installed in the reactor pressure vessel and houses the reactor core, an arc plate formed in an arc concentric with the outer diameter of the shroud, and a bottom plate fixed to the bottom of the arc plate. By providing the shielding plate for shielding the radiation dose, a high radiation dose from the shroud can be shielded.

According to the eighth aspect, since the shielding plate according to the seventh aspect is formed in an L-shaped cross section by the arc plate and the bottom plate, it is possible to shield against a radiation dose from below.

According to the ninth aspect, an opening / closing lid for shielding the radiation dose from below is attached to the bottom plate of the shielding plate according to claim 7 or 8, thereby further increasing the radiation dose from below. A shielding effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view showing a nozzle plug and a plug insertion device in an embodiment of a reactor pressure vessel nozzle plug handling device according to the present invention.

FIG. 2 is a partial cross-sectional plan view of FIG.

FIG. 3 is an enlarged sectional view showing the nozzle plug of FIG. 1;

FIG. 4 is a partial cross-sectional plan view showing an attached state of the nozzle plug of FIG. 1;

FIG. 5 is a partial cross-sectional front view showing a nozzle plug and a plug removing device in an embodiment of the reactor pressure vessel nozzle plug handling device according to the present invention.

FIG. 6 is a partial sectional plan view of FIG. 5;

FIG. 7 is a partial cross-sectional side view showing a shielding device in an embodiment of the reactor pressure vessel nozzle plug handling device according to the present invention.

FIG. 8 is a front view showing the shielding device of FIG. 7;

FIG. 9 is a perspective view showing an attached state of the shielding device of FIG. 7;

FIG. 10 is a sectional view showing a reactor pressure vessel of a general boiling water reactor.

11 is an enlarged sectional view showing the water level instrumentation nozzle of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 reactor 2 reactor pressure vessel (RPV) 3 steam dryer 4 steam separator 5 fuel assembly 6 control rod 7 control rod drive mechanism 8 water 9a, 9b water level instrumentation nozzle 10 stainless steel overlay 11 welding member 12 Shroud 13 Plug insertion device 14 Suspension wire 15 Rodless cylinder (plug moving means) 16a, 16b Water supply port 17 Moving table 18 Linear guide 19 Cylinder 20 Buffer member 21 Tightening bolt 22a, 22b Water supply port 23 Plug fixture 24 Cylinder Reference Signs List 25 piston rod 26 stopper 27 engaging pin 28 locking member 29a, 29b air supply port 30 nozzle plug 31 contact plate 32 nozzle insertion section 33 locked part 34 air supply hose 34a pipe joint 35 through hole 36 base 37 O-ring 38 Spacer 39 Spacer 40 Tube seal 41 Ring 42 lip seal 43 communication hole 44 head 45 engagement hole 50 plug removal device 51 rodless cylinder (plug moving means) 52a, 52b water supply port 53 mounting table 54 buffer member 55 plug fixture 56 cylinder 57 piston rod 58 stopper 59 Engagement pins 60a, 60b Air supply port 61 Eye bolt (locking member) 70 Shielding device 71 Arc plate 72 Bottom plate 73 Opening / closing lid 74 Shaft 75 Eye bolt 76 Connecting rod 77 Suspension plate 78 Tightening nut 79 Positioning guide 80 Connecting member

Claims (9)

[Claims] 1. A reactor pressure vessel nozzle plug handling device for closing a nozzle inside by inserting a nozzle plug with a plug insertion device into a nozzle horizontally fixed to a side portion of the reactor pressure vessel, The plug insertion device is configured to move the locking member to which the suspension wire is locked, a plug fixing tool for detachably fixing the nozzle plug, and the plug fixing tool to which the nozzle plug is fixed in a direction in which the nozzle plug is inserted. A plug handling device for a reactor pressure vessel nozzle, comprising: plug moving means. 2. A reactor pressure vessel nozzle plug handling device, comprising: a nozzle horizontally fixed to a side portion of a reactor pressure vessel, closed by a nozzle plug, and having a plug removal device for pulling out the nozzle plug. The plug removing device includes a locking member to which the hanging wire is locked, a plug fixing tool for detachably fixing the nozzle plug, and a plug fixing tool to which the nozzle plug is fixed is moved in a direction in which the nozzle plug is pulled out. A plug handling device for a reactor pressure vessel nozzle, comprising: plug moving means. 3. The reactor pressure vessel nozzle plug handling device according to claim 1, wherein the plug moving means is a rodless cylinder. 4. The reactor pressure vessel nozzle plug handling apparatus according to claim 1, wherein a plurality of different seal members are attached to the nozzle plug along the axial direction of the nozzle insertion portion. 5. The reactor pressure vessel nozzle plug handling device according to claim 2, wherein, when the nozzle plug is pulled out from the nozzle, the rodless cylinder is driven to press the piston portion against the inner wall surface of the reactor pressure vessel. A reactor pressure vessel nozzle plug handling device, wherein the nozzle plug is pulled out by the reaction force. 6. The reactor pressure vessel nozzle plug handling device according to claim 3, wherein the rodless cylinder is driven by supplying water pressure. 7. A reactor pressure vessel nozzle plug handling device for closing a nozzle inside by inserting a nozzle plug into a nozzle horizontally fixed to a side portion of the reactor pressure vessel with a plug insertion device, An outer wall surface of a shroud installed in a reactor pressure vessel and containing a reactor core is provided with an arc plate formed in an arc concentric with the outer diameter of the shroud, and a bottom plate fixed to the bottom of the arc plate. A reactor pressure vessel nozzle plug handling device, characterized in that a shielding plate for shielding the reactor is provided. 8. The reactor pressure vessel nozzle plug handling device according to claim 7, wherein the shielding plate is formed into an L-shaped cross section by an arc plate and a bottom plate. 9. The reactor pressure vessel nozzle plug handling device according to claim 7, wherein an opening / closing lid for shielding a radiation dose from below is attached to a bottom plate of the shielding plate.