JP4746273B2 - In-furnace work system - Google Patents

Description

  The present invention relates to an in-core work system for performing inspection, maintenance, repair and the like in a reactor pressure vessel in a boiling water nuclear power plant.

  In recent years, the occurrence of stress corrosion cracking has been reported on the reactor internals of nuclear power plants, and the need to inspect, maintain, and repair each part of the reactor internals centered on the welds has increased. Yes.

  Conventionally, when performing this kind of inspection, maintenance, repair, etc., it has been proposed to remotely operate the work robot to perform the above work by winding and unwinding cables inside the reactor filled with water. (For example, refer to Patent Document 1).

By the way, in order to avoid interference with fuel changers, auxiliary carts, reactor internals, etc. for inspection, maintenance and repair of light water reactors, such as boiling water reactor internals, fuel changers and In general, it is performed as a critical process without performing a parallel operation with an in-furnace operation such as fuel exchange using an auxiliary cart. For this reason, a system based on the premise of securing a critical process has also been developed for the in-furnace work system.
JP-A-10-123287

  Therefore, inspections, maintenance, and repairs in the reactor pressure vessel are performed at different times from the fuel handling and control rod handling processes using the fuel changer. This is the cause of In addition, it is currently difficult to carry out two inspections, maintenance, repairs, and other constructions in parallel, which causes a prolonged operation in the furnace.

  The present invention has been made in response to such a conventional situation, and is used for a fuel changer, an auxiliary carriage, an in-furnace structure, or other in-furnace work performed in parallel when performing the in-furnace work. An object of the present invention is to provide an in-furnace working system capable of avoiding interference with devices, jigs and the like.

To achieve the above object, the invention according to claim 1, the upper surface inside the operation floor opening of a boiling water nuclear reactor is disposed at substantially the same height as in the reactor well and the upper surface of the operation floor, fuel A work space formed by a radiation shielding member that has a ring-shaped inner surface shape that is substantially the same size as the inner diameter of the reactor pressure vessel so as not to interfere with the work using the replacement machine , A cable introduced into the reactor pressure vessel from above the reactor well through the work space, cable processing means capable of moving in water in the reactor and changing the cable position, and the fuel changer testing in different furnace from the work using the working unit for performing maintenance or repair work tasks, arranged outside the furnace, the said cable processing unit and the working unit Connected via Buru, furnace, characterized in that it comprises a control panel for controlling for remotely operating the working means as in parallel with the work carried out in the furnace working using the refueling machine work Provide a system.

  According to a second aspect of the present invention, there is provided the in-reactor work system according to the first aspect, wherein the work space includes a movable work space capable of changing a position in the reactor pressure vessel.

  In the invention which concerns on Claim 3, the said cable processing means or the said working means provides the in-furnace working system of Claim 1 provided with two or more by the said cable.

  According to a fourth aspect of the present invention, there is provided the in-furnace working system according to the first aspect, further comprising a monitoring camera capable of monitoring a state around the working means and the cable processing means in the furnace.

In the invention according to claim 5, the cable processing means includes an outer shell case, a propulsion device for underwater propulsion provided on an outer side portion of the outer shell case, a first motor that drives the propulsion device, An active roller that abuts the cable and is driven by a second motor to send out and wind the cable, an arm provided near the cable outlet and capable of swinging the cable, and a swing angle of the arm. An in-furnace working system according to claim 1, further comprising an angle recognizing device for recognizing .
According to a sixth aspect of the present invention, the rail includes an upper edge of the reactor pressure vessel and a rail attached in a circumferential direction of the main steam line plug, and the cable processing means drives a wheel that contacts the rail and the wheel. A first motor that contacts the cable, and an active roller that is driven by the second motor to feed and take up the cable, and the cable processing means travels along the rail. An in-furnace working system according to claim 1 is provided.

  In addition, a desirable aspect in the present invention has the following configuration.

  In a boiling water reactor, a work space that does not interfere with work performed using a fuel changer is formed in the reactor well, and the inside of the reactor that operates the cable processing means and work means charged in the reactor A working system, a working space in the reactor well, working means and cable processing means in the reactor, means for measuring the mutual position of the working means and cable processing means in the reactor, An in-furnace working system comprising: a monitoring camera capable of monitoring the surroundings of the working means and the cable processing means.

  A work space that can avoid interference with inspection, maintenance, or repair work performed in the reactor is formed in the reactor well, allowing workers to enter the reactor well. It is possible to avoid interference with inspection, maintenance, repair work or periodic inspection work performed in the factory, and by operating the cable processing means and work means that can be moved and installed, another in-furnace work In-furnace work system that performs in parallel.

  In a boiling water nuclear reactor, an in-core work system comprising a plurality of cable processing means and work means used when performing in-core work in parallel with work performed using a fuel changer. A control panel for realizing remote operation of the working means and the cable processing means, the cable connecting the control panel, and the cable interfering with the fuel changer, the auxiliary carriage or the in-furnace structure It is possible to monitor the surrounding conditions of the working means and the cable processing means in the furnace, the cable processing means for avoiding the above, the means for measuring the mutual position of the working means and the cable processing means in the furnace In-furnace work system equipped with a monitoring camera.

  An in-furnace work system comprising a plurality of movable and installable cable processing means and work means capable of avoiding interference with a fuel changer, an auxiliary cart, or an in-furnace structure.

  Cable processing means include operation floor, rack on dryer separator pool, reactor water surface, reactor well, reactor pressure vessel, stud bolt, main steam line plug, feed water sparger, core spray line, jet pump, core shroud, etc. An in-reactor work system that is placed on part or all of the inner surface of the reactor internal structure, reactor pressure vessel, or nozzle inner surface.

  The in-furnace working system, wherein the working means includes position measuring means and is capable of measuring a target position to be worked in the furnace.

  The working means and the cable processing means comprise means for measuring and displaying the mutual positional relationship, and an in-reactor working system capable of monitoring the presence position with respect to the equipment arrangement in the main body or the reactor.

  The working means and the cable processing means are an in-furnace working system capable of monitoring the main body and its surroundings by video from a separately provided monitoring camera.

  The cable processing means is an in-furnace work system in which at least one cable processing means can be moved and installed by remote operation according to the position of the working means, and the cable routing route can be changed.

  According to the present invention, the inspection, maintenance, repair, etc. in the furnace can be performed in parallel with the in-furnace work performed by the fuel changer such as the fuel change. It can be achieved. In parallel with the in-reactor work at the bottom of the reactor, it is also possible to work in the relatively upper part of the reactor using the in-reactor work system. Is possible.

  Hereinafter, an embodiment of an in-furnace work system according to the present invention will be described with reference to the accompanying drawings.

First Embodiment (FIGS. 1 to 5)
FIG. 1 is a cross-sectional view of a boiling water reactor, a fuel pool, and a dryer separator pool during operation of a fuel changer to which the present invention is applied.

  Reference numeral 1 is a reactor well, 2 is a dryer separator pool, and 3 is a fuel pool. The fuel changer 4 is moving at the time of fuel exchange in these upper parts. A reactor pressure vessel 5 is present below the reactor well 1.

  In the reactor system of the present invention, a work space that does not interfere with the fuel changer or its auxiliary cart is installed in the reactor well 1, and a worker enters the work space and the cable processing means and work means described later. The operation in the furnace is performed by

  FIG. 2 is an enlarged cross-sectional view showing details of the reactor pressure vessel 5 shown in FIG. In FIG. 2, the upper lid and the furnace upper mechanism are removed.

A stud bolt 6 for fixing an upper lid of the reactor pressure vessel 5 is installed on the upper portion of the reactor pressure vessel 5. Further, at the upper part of the reactor pressure vessel 5, there is a main steam nozzle 7 for recovering steam when the reactor is operating. For example, in order to prevent water from entering the nozzle during fuel replacement, a main steam line plug is provided. 8 is installed. Inside the reactor pressure vessel 5 , a core shroud 9 is supported by a welded structure with respect to the shroud support 10. A gap between the reactor pressure vessel 5 and the core shroud 9 is filled with cooling water, and a plurality of jet pumps 11 are arranged in the gap in the gap. Further, a water supply sparger 12 and a core spray line 13 for cooling the inside of the furnace are installed.

  FIG. 3 is a view relating to the embodiment of the present invention, in which the reactor well 1, the dryer separator pool 2, and the fuel pool 3 are viewed from above. 3A shows a state viewed from directly above, and FIG. 3B shows a state viewed from obliquely above.

A working space 14 is formed in the reactor well 1 as indicated by broken line hatching in these drawings. The work space 14 is configured as a ring-shaped arrangement along the inner surface of the reactor pressure vessel 5 as a donut shape into which an operator can enter, for example, by a radiation shielding member. Then, by performing the in-furnace work from the work space 14 that does not interfere with the operating range of the fuel changer 4 , it is possible to perform the in-furnace work in parallel with the fuel exchange. In addition, since it is possible to work from a location closer to the work target portion than before, it is possible to efficiently perform the work in the furnace. A stand 15 for installing a control system for the cable processing means and the working means is installed on the upper part of the dryer separator pool 2.

  FIG. 4 is a diagram showing an outline of the in-furnace work system according to the present embodiment.

  This in-reactor work system includes the above-described work space 14 in the reactor well 1, and a worker 16 performs work here. In addition, a working means 17 for performing each of inspection, repair, and maintenance work is provided. As will be described later, the working unit 17 includes a position measuring unit 18 capable of measuring a work target position in its own furnace. The working means 17 is connected to the cable processing means 20 by a cable 19. The cable processing means 20 is intended to smoothly position the working means and to prevent the cable from interfering with the internal structure in the nuclear reactor.

The cable processing means 20 can be operated remotely, whereby the routing of the cable 19 can be changed. In FIG. 4, only one cable processing means 20 is shown, but a plurality of cable processing means 20 can be used depending on the in-furnace work target location. The working means 17 and the cable processing means 20 are connected to the control panel 21 installed on the gantry 15 via the cable 19 and the worker 16. Control when the cable processing means 20 and the working means 17 are remotely operated is performed by the control panel 21. Moreover, the work unit 17 and cable processing unit 20 is capable of monitoring its surroundings by the monitoring camera 22. The monitoring camera 22 can be operated by the worker 16 or can be controlled by the control panel 21. If the cable 19 is laid so as not to interfere with the rail 68 of the fuel changer 4 and sufficient space is secured, the control panel 21 may be installed on the operation floor 69.

FIG. 5 is a cross-sectional view showing an example of the cable processing means 20. The cable processing means 20 has an outer shell case 23 that can move in water, and a pair of propulsion devices 26a and 26b for underwater propulsion such as screws are installed on the outer side. These propulsion devices 26a and 26b are connected to motors 25a and 25b via power transmission belts 27a and 27b, respectively, to secure power. Inside the outer shell case 23 is an inner shell case 24 via bearings 30a to 30d. In addition to the bearings 30a to 30d, by installing pulleys 36 and 37 from the motor 33 via the power transmission shaft 35, the outer shell case 23 can be rotated at an arbitrary angle with respect to the inner shell case 24. is there. Therefore, with the above function, the cable processing means 20 can freely swim in the furnace and adsorb to the wall surface.

Further, the cable processing means 20 incorporates an active roller 29, a passive roller 28 and free wheels 31 a to 31 d via a power transmission belt 34 from a motor 32. Therefore, the cable 19 can be smoothly fed out and wound up. Further, an arm 41 capable of swinging to guide the cable 19 is installed near the outlet of the cable 19. The swing angle 42 of the arm can be recognized by a swing angle recognizer 39 in the inner shell case 24 connected via the cable 40. Further, a pressure measuring device 38 is built in the inner shell case 24 so that water pressure can be measured. From the above-described swing angle 42 and water pressure, it is possible to grasp the position of each cable processing means 20 in the furnace. At the same time, it is possible to check the situation around the cable processing means 20 by using a separate monitoring camera 22 (see FIG. 3).

The work means 17 can be attached with work modules for inspection, repair, and maintenance. Further, since the position measuring function 18 in the furnace is provided, the position can be measured remotely. At the same time, it is possible to check the situation around the cable processing means 20 using a separate monitoring camera.

  The work means 17 is suitable for the work performed at that time. For example, a TV camera is used for visual inspection, and an eddy current probe, an ultrasonic probe, an array-type ultrasonic probe, an EDM apparatus, or an ultrasonic probe apparatus using a laser is used for flaw detection. . When carrying out repair / maintenance work, the most suitable equipment is used such as a laser decontamination device, a surface modification device, a welding device, a polishing device, or a brushing device.

Second Embodiment (FIG. 6)
A second embodiment of the in-furnace work system of the present invention will be described with reference to FIG.

  FIG. 6 shows a configuration in which a movable work space 43 is connected to the work space 14 described above. The movable work space 43 travels with the rail 44 installed along the inner periphery of the work space 14 as a guide, and can make one round of the reactor well 1. Further, a hoist 45 is installed in the movable work space 43 so that a work object can be lifted. Thereby, working efficiency can be further improved.

  As described above, according to this embodiment, it is possible to perform inspection, maintenance, and repair in the furnace while the fuel changer 4 is in operation. In addition, during the work at the bottom of the reactor, it is possible to perform the in-core work at the top of the reactor in parallel using the system of the present embodiment. In addition, since workers can enter the reactor well, work efficiency is improved as compared with conventional work in the reactor. Due to this effect, it is possible to shorten the in-furnace work process.

[Third Embodiment] (FIGS. 7 to 9)
In the present embodiment, in the boiling water reactor, a plurality of cable processing means 20 and working means 17 used for performing the in-reactor work are arranged in parallel with the work performed using the fuel changer 4. And a control panel 21 for realizing remote operation of the working means 17 and the cable processing means 20 , and a cable 19 connecting the control panel 21 and the cable 19 Cable processing means 20 for avoiding interference with the fuel changer 4 or auxiliary cart or in-furnace structure, means for measuring the mutual position of the working means 17 and the cable processing means 20 in the furnace, and the furnace And a monitoring camera 22 capable of monitoring the surrounding conditions of the working means 17 and the cable processing means 20 .

As a result, inspection, maintenance, and repairs in the furnace can be performed in parallel with the in-furnace work performed by the fuel changer 4 such as a fuel change, so that the time for the in-furnace work can be significantly reduced. is there. Further, the number of workers who operate the cable 19 and the working means 17 can be reduced, and the exposure dose can be reduced. Details will be described below.

It is a figure which shows sectional drawing of the boiling water nuclear reactor, fuel pool, and dryer separator pool in which the fuel change machine to which this invention is applied is working. Reference numeral 1 is a reactor well, 2 is a dryer separator pool, and 3 is a fuel pool. The fuel changer 4 is moving at the time of fuel exchange in these upper parts. A reactor pressure vessel 5 is present below the reactor well 1. The in-furnace system of the present invention provides a cable processing means 20 and a work means 17 that can be moved and installed in order to avoid interference with a fuel changer or its auxiliary cart or an in-furnace structure to be described later. This will also reduce the number of employees.

  FIG. 7 is a view of the reactor well 1, the fuel pool 3, and the dryer separator pool 2 as viewed from above. A gantry 14 is installed on the top of the dryer separator pool 2.

  FIG. 8 is a diagram showing an outline of the in-furnace work system according to the present embodiment.

  This in-furnace work system is provided with working means 17 for performing each work of inspection, repair, and maintenance. The working means 17 includes a position measuring means 18 capable of measuring the work target position in its own furnace. The working means 17 is controlled by a control panel 21 installed on a mount 15 installed on the dryer separator pool 2 via a cable 19. At this time, the cable processing means 20 is installed at various locations of the cable 19 so that the cable 19 does not interfere with the fuel changer 4, the auxiliary cart, or the in-furnace structure. Further, the cable processing means 20 can be operated remotely, whereby the routing of the cable 19 can be changed. The control at that time is performed by the control device 21 installed on the gantry 15 similarly to the working means 17. Further, the working means 17 and the cable processing means 20 can be monitored by the monitoring camera 22 in the vicinity thereof.

  Hereinafter, the cable processing means 15 and the work means 16 constituting the in-furnace work system according to the present embodiment will be described in detail.

  FIG. 9 shows a specific installation position of the cable processing means.

  The cable 19 connects the control device 21 and the first cable processing means 46. The first cable processing means 46 has a function of feeding and winding the cable 19. Depending on the installation position of the second cable processing means 47, the third cable processing means cable 48 or the fourth cable processing means 49, which will be described later, the cable The length of 19 can be adjusted.

Next, the cable 19 exiting the first cable processing means 46 is guided to the second cable processing means 47. The second cable processing means 47 is intended to avoid interference with the stud bolt 6 and avoid interference with the operating area of the fuel changer. Therefore, the device can actively swim as described later, and can be remotely operated by the control device 21. Further, a cable feeding and winding mechanism is provided as a relay point between the first cable processing means 46 and the third cable processing means 47 described later.

  The cable 19 exiting the second cable processing means 47 is guided to the third cable processing means 48. The third cable processing means 48 is intended to avoid interference with the main steam line plug 8 and to position the working means 17 in the vertical direction. Like the second cable processing means 47, it is possible to swim actively, and remote control by the control device 21 is possible.

The cable 19 exiting the third cable processing means 48 is guided directly to the working means 17 or is guided to the working means 17 via the fourth cable processing means 49. The fourth cable processing means 49 can move in the vertical direction and the radial direction, and can be attached to and detached from the inner wall of the reactor pressure vessel 5 or the core shroud. This device is only installed if it is determined necessary. In particular, it is considered indispensable for access to the inside and outside of the jet pump 11 or the core shroud 9.

[Fourth Embodiment] (FIGS. 10 to 13)
FIG. 10 is a diagram showing a configuration of the nuclear reactor well 1, the dryer separator pool 2, and the fuel pool 3 as viewed from above in the fourth embodiment of the present invention.

  As shown in FIG. 10, in this embodiment, the cable processing control device 21 for processing the cable 19 and the first cable processing means 46 are installed on the side of the fuel pool 3.

  FIG. 11 is a cross-sectional view of the reactor well 1, the dryer separator pool 2, the fuel pool 3, and the reactor pressure vessel 5.

  The working means 17 is connected to the cable 19 from the control panel 21 as in the second embodiment. At this time, the second cable processing means 52 and the third cable processing means 53 have a rail traveling type configuration along the rails 50 and 51 and are attached to the upper edge of the reactor pressure vessel 5 and the circumferential direction of the main steam line plug 8. By traveling along the rails 50 and 51, interference with the fuel changer 4, the auxiliary cart, and the in-furnace structure is prevented.

  FIG. 12 is a cross-sectional view of the traveling cable processing means described above. The rails 63a and 63b travel on the rails 63 by running the wheels 54a to 54d to which the power is transmitted from the motors 56a and 56b through the rotation shafts 58a to 58l and the power transmission mechanisms 55a to 55t. The feeding and winding of the cable 19 is the same as the cable processing means shown in FIG.

  If necessary, as shown in FIG. 13, a camera 65 can be attached to the outside of the outer shell case 62 of the traveling cable processing means described above. As a result, it is possible to monitor other cable processing means, and a monitoring camera as shown in the first embodiment is not necessary.

[Fifth Embodiment] (FIGS. 14 and 15)
FIG. 14 is a view when a camera is installed on the cable processing means according to the fifth embodiment of the present invention.

For example, the second cable processing means 52 monitoring camera 66a of the third cable processing means 53, the third cable processing means 53 monitoring camera 66b of the fourth cable processing unit 49, a fourth cable processing means 49 monitors the working means 17 It is possible to have a camera 66c and monitor the surrounding situation. The direction of monitoring can be reversed.

  In the fourth embodiment and the fifth embodiment described above, all cable processing means have an active role, but in some cases, a cable processing means having a passive role can be installed. For example, the cable processing means located at a location between the cable processing means having two active roles may be a cable processing means having a passive role as shown in FIG. This is to hold the cable 19 as shown in FIG. 15 by the passively rotating shafts 67a to 67d so as not to loosen in the furnace. In addition, this apparatus may be one using a passively rotating pulley (not shown).

  Further, in the fourth embodiment and the fifth embodiment described above, the installation place of the cable processing means 20 is the stud bolt, the main steam line plug, and the vertical downward direction thereof. Depending on the case, it may be installed in a core spray pipe, a feed water sparger, a core shroud, a jet pump, or the like.

As described above, according to the present embodiment, in parallel with the work using the fuel changer 4 , it is possible to perform inspection, maintenance, and repair in the furnace without safely interfering with the work in the furnace. It is possible to shorten the process. Moreover, it is possible to reduce the number of workers who operate cables such as working means.

The figure which shows the cross section of the boiling water reactor to which the in-core work system by 1st Embodiment of this invention is applied. FIG. 2 is a cross-sectional view of the nuclear reactor of FIG. 1. (A), (B) is the figure which looked at the reactor well, the fuel pool, and the dryer separator pool in 1st Embodiment of this invention from the upper direction. 1 is a cross-sectional view of a nuclear reactor showing an outline of an in-core work system according to a first embodiment of the present invention. Sectional drawing of the cable processing means by 1st Embodiment of this invention. The figure which shows 2nd Embodiment of this invention. The figure which looked at the reactor well, the fuel pool, and the dryer separator pool in 3rd Embodiment of this invention from upper direction. Sectional drawing of the nuclear reactor which shows the outline | summary of 3rd Embodiment of this invention. The specific layout of the cable processing means in the third embodiment of the present invention. The figure which looked at the reactor well, the fuel pool, and the dryer separator pool in 4th Embodiment of this invention from upper direction. Sectional drawing of the nuclear reactor which shows the outline | summary of 4th Embodiment of this invention. Sectional drawing of the cable processing means (rail running type) used for 4th Embodiment of this invention. The external view of the cable processing means (rail running type) used for 4th Embodiment of this invention. The specific layout of the cable processing means in the fifth embodiment of the present invention. The external view of the cable processing means which comprises the passive role in 5th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Reactor well 2 Dryer separator pool 3 Fuel pool 4 Fuel change machine 5 Reactor pressure vessel 6 Stud bolt 7 Main steam nozzle 8 Main steam line plug 9 Core shroud 10 Shroud support 11 Jet pump 12 Water supply sparger 13 Core spray line 14 Work space 15 Base 16 Worker 17 Work means 18 Position measurement means 19 Cable 20 Cable processing means 21 Control panel 22 Monitoring camera 23 Outer shell case 24 Inner shell case 25a, b Motor 26a, b Propulsion machine 27a, b Power transmission belt 28 Passive roller 29 Active roller 30a-d Bearing 31a-d Free wheel 32 Motor 33 Motor 34 Power transmission belt 35 Power transmission shaft 36 Pulley 37 Pulley 38 Pressure measuring device 39 Swing angle recognizer 40 Cable 41 Arm 42 Arm swing angle 43 Movable work space 44 Rail 45 Hoist 46 First cable processing means 47 Second cable processing means 48 Third cable processing means 49 Fourth cable processing means 50 Rail 51 Rail 52 Second cable processing means (rail travel type)
53 Third cable processing means (rail travel type)
54a-d Wheels 55a-t Power transmission mechanism 56a, b Motor 57 Motor 58a-l Rotating shaft 59 Active roller 60 Passive roller 61a-d Free wheel 62 Outer shell case 63a, b Rail 64 Power transmission belt 65 Camera 66 Camera 67 Passive Rotating shaft 68 Rail 69 Operation floor

Claims (5)

Inside the operation floor opening of the boiling water reactor, the inner surface of the reactor pressure vessel is arranged in the reactor well whose upper surface is almost the same height as the upper surface of the operation floor so as not to interfere with the operation using the fuel changer A work space formed by a radiation shielding member that has a ring-shaped inner surface shape that is approximately the same size as that of an operator and can enter.
A cable introduced into the reactor pressure vessel from above the reactor well through the work space;
Cable processing means capable of underwater movement in the furnace and making the cable position variable;
Working means for performing inspection, maintenance or repair work in a furnace different from the work using the fuel changer;
Control provided outside the furnace, connected to the cable processing means and the working means via the cable, and remotely operating the working means so as to perform the in-furnace work in parallel with the work using the fuel changer And a control panel for performing an in-furnace work system. The in-reactor work system according to claim 1, wherein the work space includes a movable work space capable of changing a position in the reactor pressure vessel. The in-furnace working system according to claim 1, wherein a plurality of the cable processing means or the working means are provided in the cable. The in-furnace working system according to claim 1, further comprising a monitoring camera capable of monitoring a surrounding state of the working means and the cable processing means in the furnace. The in-furnace work system according to claim 1, wherein the cable processing means performs fixing, feeding, winding or manipulating of the cable.

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