JPH0735891A - Working unit in reactor core - Google Patents

Abstract

PURPOSE:To provide a work unit which allows cleaning, inspection, and repair works even at a complicated and limited part in a nuclear reactor. CONSTITUTION:A pressure vessel 1 for nuclear reactor is secured, at the flange thereof, with a supporting base 11 onto which a turning rail 12 is secured and a turn table 13 is installed thereon. The turn table 13 is turned by means of a turning motor and mounting a plurality of hoists 14. An elevating/lowering beam 17 is suspended by means of the wire 8 of a hoist 14 below the supporting base 11. The beam 17 is fixed with a laterally movable telescopic mast 20 having an end fixed with a working tool 23 of various type. The beam 17 is fixed, at the opposite ends thereof, with pads 22 which come into tight contact with the inner wall face of the vessel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to in-reactor work for inspecting and inspecting equipment in a reactor pressure vessel such as a light water cooling type reactor for cleaning and soundness, and for repairing equipment in the reactor pressure vessel. Regarding the device.

[0002]

2. Description of the Related Art In order to maintain safe and efficient operation of a nuclear power plant, regular inspections and daily inspections of various equipment are indispensable. For example, a device having an underwater television camera attached to the tip of a mast or a rod is used for visual inspection in order to check the soundness inside the shroud installed in the reactor pressure vessel of a light water cooled reactor. Also,
Underwater swimming-type reactor robots are used for more flexible visual inspection.

The shroud holds a core support plate and an upper lattice plate and wraps the entire fuel assembly to form a core. The core support plate holds the fuel assembly through a control rod guide tube and fuel support fittings. Retaining, the upper grid plate is incorporated in the upper part of the shroud and holds the upper end of the fuel assembly.

In the field of application of nuclear robots, there are replacement / transportation, disassembly / assembly, decontamination / cleaning, inspection / measurement, repair, etc. as the work at the plant periodic inspection, and inspection / monitoring maintenance as the work at the plant operation. There is work.

Among the robots for nuclear power, as inspection robots, floor-running type and ceiling-running type in-container inspection robots, automatic monitoring robots for inspecting and monitoring equipment such as reactor buildings and turbine buildings, small intelligent inspection robots , Turbine interior inspection robots, intelligent work robots, circulating water pipe cleaning robots, ladder lifting robots, etc. have already been developed and used.

Conventionally, when cleaning and inspecting the equipment in the reactor pressure vessel and inspecting it and repairing the equipment in the reactor pressure vessel, a TV camera or the like is hung from the upper part of the reactor, The work device is hung in the furnace using a wire rope hoist called an auxiliary hoist installed in the refueling machine, and a spray head for cleaning is installed in the furnace, and then the upper lid of the reactor pressure vessel is installed. It was drained and washed.

[0007]

The conventional inspection robot is a visual inspection type that visually inspects the inside of the shroud of a light water cooling type reactor, and cannot perform inspection, inspection or repair work by other methods. . In addition, the work robot can perform general-purpose maintenance and maintenance work of equipment in various plants, but does not have an inspection / inspection function.

As described above, the conventional inspection and work robots have a problem that they do not have a repair function for repairing the repaired portion after the inspection and the inspection. Further, during the inspection work or repair work, there is a problem that the blast, the hose for air, the electric power, etc., and the cable are left pulled out for a long time and get caught in other structures or devices, which is an obstacle.

As described above, at present, the workability is extremely poor in a place where the inside is complicated and it is difficult to access from the upper part, for example, between the shroud and the reactor pressure vessel (annulus portion), and especially in the jet pump. It is impossible to work inside. An object of the present invention is to provide a working device capable of cleaning, inspecting, inspecting, and repairing work even in a complicated and narrow part in a nuclear reactor.

[0010]

DISCLOSURE OF THE INVENTION The present invention relates to a working apparatus main body installed at an upper end opening of a reactor pressure vessel, a control apparatus installed on an operation floor above the reactor pressure vessel, the control apparatus and the above-mentioned control apparatus. It consists of cables, hoses, fibers, etc. connecting to the working device body, and the working device body has a supporting base fixed to a flange portion of an upper opening of the reactor pressure vessel, and a swing rail is fixed on the supporting base. , A turning table provided with at least two hoisting machines for turning on the turning rail by a turning motor,
An elevating beam is hung below the support base by the hoisting machine, and a vertically movable telescopic mast is attached to the elevating beam so that it can be moved laterally by a motor for lateral movement, and various masts are attached to the tip of the mast. Is attached, and a fixing pad is attached to the tip of the peripheral portion of the elevating beam so as to be expandable and contractable in the radial direction inside the reactor pressure vessel.

[0011]

[Operation] At the time of work, the working device body, which is a combination of a swivel table, a lifting beam, and a mast, is hung by an overhead crane, the support base is set on the flange surface of the reactor pressure vessel, and the stud bolts are used to fix it.

Next, the hoist for hoisting and lowering is operated to lower the hoisting and lowering beam. At this time, the position of the mast is set closer to the center of the reactor pressure vessel so that the working device body at the tip of the mast does not interfere with the water supply sparger.

In the case of the annulus part, after moving the mast to the reactor pressure vessel wall side after passing through the interference position, the elevating beam is further lowered to the vicinity of the upper part of the shroud, and the fixed pad is operated as necessary to operate the reactor pressure. Against the wall surface of the container,
Fix the lifting beam. Further, when working below the annulus portion, the mast is extended and the working device body is lowered to the working position.

Since the jet pump is installed in the annulus portion, the area that can be accessed from above is limited, and the working device body cannot be rotated in the circumferential direction as it is. Therefore, work is performed on all annulus parts by raising the mast once and rotating the swivel table sequentially at the position where the main body of the working device does not interfere with the equipment inside the furnace and lowering the mast between the next jet pump and the jet pump. be able to.

Before further lowering the elevating beam, the mast is moved to a position where it is inserted into the core, and the elevating beam is lowered, so that the working device body can be moved into the shroud or further below the furnace. It is possible to perform various works in those parts.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the reactor working apparatus according to the present invention will be described with reference to FIGS. FIG. 1 shows a state in which the reactor working device is installed in a reactor pressure vessel, FIG. 2 shows the working device main body in FIG. 1 in an enlarged manner, FIG. 3 is a top view of FIG. 2, and FIG. FIG. 5 is an elevational view in the direction of arrow AA of FIG. 5, and FIGS. 5 and 6 show the work procedure in FIG. 1, respectively.

That is, in FIG. 1, reference numeral 1 is a reactor pressure vessel, the upper lid for closing the upper end opening is not shown, and a flange 2 of the upper end opening and a stud bolt 3 for fixing the upper lid are shown. Shows.

A reactor core (not shown) is provided in the reactor pressure vessel 1.
A shroud 4 that surrounds the reactor is installed, and an annulus portion 5 is provided between the shroud 4 and the inner wall of the reactor pressure vessel 1.
Are formed. An operation floor 6 is provided above the reactor pressure vessel 1, and a reactor lower part 7 is provided below the shroud 4.

The flange 2 of the reactor pressure vessel 1 is fixed to the support base 11 by using stud bolts 3. As shown in FIG. 2, a large number of stud bolts 3 are erected on the surface of the flange 2. The support base 11 is provided at equal intervals in three directions as shown in FIG. 3, and has a plurality of through holes at its tip end for inserting the stud bolts 3 on the flange 2.

A control device 25 is provided on the operation floor 6.
Is installed, and the control device 25 has cables, hoses, fibers, etc. to be connected to the devices described later on the support base 11.
26 is connected.

A turning rail 12 is fixed on the support base 11, and a turning table 13 is provided on the turning rail 12. A turning motor 15 is attached to the lower surface of the turning table 13, and the turning table 13 is turned along the turning rail 12 by driving the turning motor 15.

On the revolving table 13, three lifting hoisting machines 14 and one lifting cable / hose reel 16 are mounted and fixed. Below the support base 11 are two lifting beams suspended by the wire 8 from the winding machine 14.
17 are provided.

As shown in FIG. 3, a horizontal moving rail 18 is attached to the lower end of the elevating beam 17, and
A lateral movement motor 19 is provided at 18, and the mast 20 is laterally moved by the lateral movement motor 19.

A mast hoisting machine 21 for suspending and driving the mast 20 is provided on the laterally moving rail 18 as shown in FIG. The mast hoist 21 is a hoist motor 27
A wire 28 connected to the mast 20, a reel 29 for feeding or winding the wire 28, and a base plate 30 on which the reel 29 or the like is placed.
It consists of

As shown in FIG. 3, the lifting beam 17 is provided with a fixed pad 22 which is in close contact with the inner wall surface of the reactor pressure vessel 1 so as to be movable back and forth. The fixed pad 22 is composed of a pneumatic piston or the like, contacts the inner wall surface of the reactor pressure vessel 1 by pressurization, and separates by depressurization.

Various work tools 23 necessary for cleaning, inspection, inspection and repair work are detachably provided at the tip of the mast 20. These work tools 23 may be of one kind or a plurality of kinds, and are arbitrarily selected according to the work content.

Next, with reference to FIGS. 1 and 5 to 7, an example of use of the furnace working apparatus having the above-described structure, that is, an example of a working procedure will be described. First, when performing the work, as shown in FIG. 1, the working device main body 10 is installed on the flange 2 portion using an overhead crane or the like in the air or in the water. Next, the lifting beam 17 is lowered by the lifting hoist 14 so that the work tool attached to the tip of the mast 20 can be moved to the work target portion, and the turning table 13 is turned and positioned by the turning motor 15.

When the work target portion is in the annulus portion, the mast is moved laterally from the state shown in FIG. 5 by using the lateral movement motor 19, and the upper portion of the shroud 4 and the reactor pressure vessel 1 are moved. Insert the work tool 23 into the gap of the
By using the lowering and the extension of the mast, the work tool 23 can be moved and positioned to the target portion as shown in FIG.

At the time of work, if necessary, a fixed pad is pressed against the inner wall surface of the reactor pressure vessel 1 to raise and lower the beam.
17 shaking can be prevented. When the target part is in the shroud 4 or in the lower part of the furnace, in the state of FIG. 5, after positioning the mast 20 at a position where the upper lattice plate on the upper part of the shroud 4 and the core support plate on the lower part do not interfere with the work tool, the annulus part Similarly to, the work tool 23 can be moved and positioned to the target site as shown in FIG.

According to the first embodiment described above, the work tool can be easily moved and positioned in each part of the reactor pressure vessel automatically and with high positional accuracy, so that inspection, inspection, maintenance, repair and installation / removal in the reactor can be performed. , Work time reduction such as cleaning, labor saving,
The exposure can be reduced.

Next, a second embodiment of the in-reactor working apparatus according to the present invention will be described with reference to FIG. In this embodiment, the lifting beam
An example is shown in which six 17 are arranged radially from the center in the circumferential direction, and the masts 20 are arranged on each of the lifting beams 17. That is, in this embodiment, the fixing pad 22 is attached to every other three lifting beams 17, and the mast 20 is attached to each lifting beam 17. Since the other parts are the same as those in the first embodiment, the description thereof will be omitted.

In the present embodiment, the working time can be shortened, and the working time can be further shortened by providing a plurality of masts 20 horizontally moving on the elevating beam 17 on the same horizontal moving rail 18. Further, a plurality of laterally moving masts having different functions can be installed on the same rail on the lifting beam. In this case, different operations can be performed even after once installed, so that the work efficiency and time can be shortened.

Further, a vertically movable and retractable mast can be arranged at the center of the elevating beam 17. In this case, it is suitable and effective for work such as water jet cleaning that is desired to be performed uniformly from the center.

A cushioning material and a positioning mechanism may be provided below the elevating beam 17 so as to be installed in the upper core shroud. Also, wheels may be attached instead of the cushioning material. Installation on the shroud is advantageous for positioning accuracy and manual work. By using wheels, the lifting beam can be continuously and stably turned.

Position of the lifting beam 17 (height, turning angle),
The path of the work tool may be automatically controlled by preliminarily calculating the interference with the equipment or structure in the furnace from the expansion / contraction position of the mast 20 and the shape of the work tool at the tip and limiting the movable range. In this case, accidents due to operation mistakes can be prevented and the time can be shortened.

Next, a third embodiment of the in-core working apparatus according to the present invention will be described with reference to FIG. Support base in this embodiment
From 11 the work tool relay rack 24 prepared in advance for various work is suspended in the reactor pressure vessel 1,
The other points are the same as those in the first embodiment.

In this embodiment, the work tool at the tip of the mast 20 can be remotely replaced to perform the work in the furnace, and the time can be shortened significantly.

[0038]

According to the present invention, various operations in the furnace can be efficiently performed by one apparatus, the plant downtime can be minimized, and the operation rate can be improved. In addition, it is possible to reduce the burden on the worker and the radiation exposure.

[Brief description of drawings]

FIG. 1 is a layout diagram showing a state in which a reactor working apparatus according to a first embodiment of the present invention is installed in a reactor pressure vessel.

FIG. 2 is an elevational view showing a work device body in FIG.

FIG. 3 is a top view of FIG.

FIG. 4 is an elevation view showing a partial cross section in the direction of arrow AA in FIG.

FIG. 5 is a configuration diagram showing a state in which the work tool for the mast is suspended above the shroud from the state of FIG.

6 is a configuration diagram showing a state in which a mast and a work tool are inserted into the annulus portion from the state of FIG.

FIG. 7 is a configuration diagram showing a state in which the mast and the work tool are moved to the lower part of the furnace from the state of FIG.

FIG. 8 is a plan view showing an elevating beam in a second embodiment of the working apparatus in a furnace according to the present invention.

FIG. 9 is a configuration diagram showing a third embodiment of an in-reactor working apparatus according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reactor pressure vessel, 2 ... Flange, 3 ... Stud bolt, 4 ... Shroud, 5 ... Annulus part, 6 ... Operation floor, 7 ... Lower part of the furnace, 8 ... Wire, 10 ... Working device body, 11 ... Support base, 12 ... swivel rail, 13 ... swivel table, 14 ... elevation hoist, 15 ... swing motor, 16 ... elevation cable / hose reel, 17 ... elevation beam, 18 ... transverse rail, 19 ... transverse motor, 20 … Mast, 21… Mast hoisting machine, 22… Fixing pad, 23… Working tool, 24… Working tool relay rack, 25… Control device, 26… Cable / hose / fiber, etc. 27… Motor for hoisting machine, 28… Wire , 29
… Reel, 30… Base plate.

Claims (3)

[Claims] 1. A working apparatus body installed at an upper end opening of a reactor pressure vessel, a control apparatus installed on an operation floor above the reactor pressure vessel, and a space between the control apparatus and the working apparatus body. It consists of cables, hoses, fibers, etc. to connect, and the working device body has a support base fixed to the flange portion of the upper opening of the reactor pressure vessel, a swing rail is fixed on the support base, and a swing is performed on the swing rail. A turning table provided with at least two hoisting hoists that swivel with a hoisting motor is provided, a hoisting beam hangs under the support base by the hoisting machine, and a hoisting beam is laterally moved on the hoisting beam. A mast that can move up and down is attached so that it can move, various work tools are attached to the tip of the mast, and the reactor pressure is attached to the tip of the periphery of the lifting beam. An in-reactor working device characterized in that a fixing pad is attached so as to be capable of expanding and contracting in a radial direction inside the container. 2. The in-reactor working apparatus according to claim 1, wherein a plurality of the elevating beams are arranged in the circumferential direction from the center, and a mast is arranged on each of the elevating beams. 3. A work tool relay rack in which various works are prepared in advance from the support base is suspended in the reactor pressure vessel, and the work tool attached to the tip of the mast can be remotely replaced for work. The in-furnace working device according to claim 1, wherein the working device is a furnace.