EA044640B1 - COMPLEX AND SYSTEM FOR REPAIR OF FOCUS POOL LINING - Google Patents

Description

The group of inventions relates to the field of nuclear engineering, namely to equipment for detecting leaks and repairing damaged internal lining of a spent nuclear fuel storage pool filled with water at a nuclear power plant.

A device for repairing the lining of a cooling pond is known - a device for repairing a damaged area on a section of the wall of a tank or pool located under water according to RF patent No. 2438199. The device contains a guide system installed along the side wall at a distance from it and fixed on it for guiding objects moved in the longitudinal direction last sled. A seating element for a repair pad, which is applied with its adhesive surface to the wall section containing the damaged area, is mounted on the slide with the possibility of movement. The device allows you to repair hard-to-reach damaged areas on the wall of a nuclear reactor installation pool. However, leak detection must be done by another device. Also, the known device carries out repairs only by sticking a repair pad, which is not always effective in eliminating the leak. The known device does not perform other types of repairs, such as welding.

Also known is a device for repairing the lining of a spent fuel pool (mainly the walls and bottom) according to RF patent No. 2661335, selected as the closest analogue, containing a support frame and a trolley with a telescopic rod placed on it with the ability to move, an actuator including a search and location module leaks and working modules containing a stripping device, a leak sealing device, means for fixing the actuator, a mechanism for fastening, holding, raising and lowering the actuator and a remote control device. The known repair device makes it possible to search for and find a leak, clean the surface of the leak area and then apply a sealing plaster to it, which is an unreliable and ineffective method of repair.

The problem solved by the proposed group of inventions is the implementation of quick and high-quality repairs of the spent fuel pool.

The complex and system of the proposed group of inventions should provide leak detection, repair of the cooling pond floor lining and control of the tightness of repaired areas under the water level (boron solution), as well as leak detection and repair of the cooling pond lining in the wall-to-wall and wall-to-floor junction areas. The complexity of the task lies in the fact that the operating area of the device is limited by racks located in water (in boron solution). The cooling pool contains rack supports, coolant supply and intake pipes, rack stops, columns, and cables. Initially, it is necessary to determine the location of the leak and the size of the defect on the surface of the cooling pool, and clean this place before surfacing. The thickness of the lining pool sheet is about 4 mm; the sheet is made of alloy steel, for example, 08Х18Н10Т. Surfacing must be carried out in a boron solution, after which it is necessary to process the resulting weld (surfacing) in such a way that fragments of scale do not get into the cooling pool after the surfacing process. Then it is necessary to check the result of surfacing on the repaired surface of the spent fuel pool.

Previously known methods and devices did not provide adequate quality of repairs. Thus, the technical result of the proposed group of inventions is to improve the quality and reliability of repairs.

The specified technical result related to the complex for repairing the cooling pond lining is achieved by the fact that the complex for repairing the cooling pond lining, containing a delivery device with a trolley, an executive unit, including a module for searching and locating a leak, and working modules containing a stripping device, a sealing device leaks, means for fixing the executive unit, a mechanism for fastening, holding, raising and lowering the executive unit and a remote control device, according to the present invention is additionally equipped with devices that are not immersed in the cooling pool, including pneumatic and electrical equipment, an electrical control cabinet, a control panel with an ultrasonic flaw detector and welding equipment, and devices immersed in the cooling pool, including a submersible repair robot with an executive unit placed on it, while the submersible repair robot is equipped with a transport platform with working modules located on it, the transport platform is made in the form of a frame structure and is equipped with means of fixation to the surface cooling pool, made in the form of vacuum suction cups, the executive unit is equipped with drives with translational or rotational movement of the output link, an ultrasonic control head, a video surveillance device, a device for collecting waste during grinding, including a pump and filter, a manipulator with servo drives and drives for its movement, The leak sealing device is made in the form of a small-sized welding installation connected to the welding equipment, the delivery device is made in the form of a delivery platform, the delivery platform is equipped with a trolley for installing a mechanism for fixing, holding, raising and lowering the actuator, a mechanism for moving the trolley and is made in the form of a collapsible frame-beam structure equipped with guides for moving the trolley installed on them.

The complex for repairing the cooling pond lining is predominantly equipped with drives for moving the working modules.

The complex for repairing the cooling pond lining can be additionally equipped with feedback sensors installed in the rods of each of the three servo drives for moving the platform with working modules.

A small-sized welding installation of a complex for repairing the lining of a swimming pool primarily includes a rectifier on a trolley, a control unit including a pressure compensation system, connecting signal and power cables, a movable unit including a receiving gear motor, an oscillating device, a base unit including a sealed stainless steel housing , pressure sensor, welding wire spool, wire feed drive and wire locking device.

The complex for repairing the lining of a soaking pool is mainly equipped with a wire biting device.

The specified technical result related to a system for repairing a cooling pond is achieved in that the system for repairing the lining of a cooling pond, mainly the walls and bottom, contains a delivery device, an actuator including a module for searching and locating a leak and working modules containing a cleaning device, leak sealing device, means for fixing the actuator, a mechanism for fastening, holding, raising and lowering the actuator and a remote control device, according to the present invention is additionally equipped with devices that are not immersed in the cooling pool, including pneumatic and electrical equipment, an electrical control cabinet, a control panel with ultrasonic flaw detector and welding equipment, and devices immersed in the cooling pond, including a submersible repair platform for placing the actuator, and the actuator is equipped with a servo drive, an ultrasonic control head, a video surveillance device, a device for treating welds and the surface of the cooling pond from contamination, and a cutting device wire, including a container for collecting scraps and a pump for collecting particles, the delivery device is made in the form of a delivery platform and is equipped with a trolley for installing a mechanism for fastening, holding, raising and lowering the actuator and a mechanism for moving the trolley, the delivery platform is made in the form of a collapsible frame-beam structure , equipped with guides for moving a trolley installed on them, the submersible repair platform is made of an external frame and an internal frame, installed with the possibility of mutual movement and fixation, and is connected to the delivery platform, the leak sealing device is made in the form of a small-sized welding installation connected to the welding equipment, and the submersible repair platform is equipped with means for its fixation to the surface of the spent fuel pool.

The means for fixing the submersible repair platform of the system for repairing the lining of the spent fuel pool are predominantly made in the form of vacuum suction cups and/or conical guides.

The system for repairing the cooling pond lining is predominantly equipped with a drive for extending the working modules.

The cooling pond lining repair system can be equipped with position sensors and feedback sensors installed on the transport platform and the submersible repair platform.

A small-sized welding installation for a system for repairing the lining of a soaking pool mainly includes a rectifier on a trolley, a control unit including a pressure compensation system, connecting signal and power cables, a movable unit including a receiving gearmotor, an oscillating device, a base unit including a sealed stainless steel housing, a sensor pressure, welding wire spool, wire feed drive and wire locking device.

In fig. 1 shows a general view of the system for repairing the spent fuel pool; FIG. 2 shows a general view of the submersible repair platform; FIG. Figure 3 shows a general view of the submersible repair robot.

The main goal solved by the proposed group of inventions is the detection of a defect and its elimination.

The proposed group of inventions makes it possible to solve the following requirements: to create a device for carrying out leak detection, cleaning and welding operations, to consistently perform these operations according to a given algorithm in an aggressive environment, taking into account the radiation component, while the device must be delivered to the spent fuel pool at the place of work, it will be connected to actuators for search and repair (working modules) by cables and hoses; the device must be small in size, have sufficient positioning accuracy, carry out work at depth and be controlled remotely from the operator’s station.

The system for repairing the lining of the spent fuel pool contains the following elements: delivery platform 1, an executive unit, including a module for searching and locating the leak location and working modules.

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Structurally, delivery platform 1 is a movable metal structure mounted on running wheels, which move along a rail track laid along the spent fuel pool. Compact gearmotors, the speed of which is controlled by a frequency converter, were selected as the movement mechanisms of delivery platform 1. Tracking drives allow you to move technological equipment with a positioning accuracy of ±1 mm. The position of the drives is determined using potentiometric sensors.

The working modules contain a stripping device, a leak sealing device, means for fixing the actuator, a mechanism for fastening, holding, raising and lowering the actuator, a device for treating welds and the surface of the holding pool from contamination, a device for cutting wire, including a container for collecting scraps and a pump for particle collection, as well as a remote control device.

The system for repairing the cooling pond lining to carry out work at depth in the cooling pond is equipped with devices that are not immersed in the cooling pond, schematically shown in Fig. 1 and including pneumatic equipment 2, electrical control cabinet 3, control panel 4 with an ultrasonic flaw detector and welding equipment 5.

The devices immersed in the cooling pool are a submersible repair platform 6 or, in another embodiment, a submersible repair robot. Submersible repair platform 6 is designed to accommodate the actuator and working modules.

In turn, the actuator is equipped with a servo drive, an ultrasonic control head, and a video surveillance device.

The submersible repair platform 6 is a frame structure 7 made of profiles with drives 8 for positioning the working modules and is intended for installation on the support of a section of the rack or mounting on the wall of the cooling pool on vacuum suction cups 9 or on conical guides.

On the frame structure of the submersible repair platform 6 there are two guides for precise positioning of working modules 10 (process equipment) along the long side of the platform and one guide for precise positioning of process equipment along the short side. As a drive 8 for each of the guides, a motor is installed, selected according to the required torque (load) and the speed of movement of the working modules.

All drives are equipped with limit sensors to control their operation according to the algorithm.

The submersible repair platform 6 is connected to the delivery platform 1, consisting of an outer frame and an inner frame installed with the possibility of mutual movement and fixation.

Control boxes are installed on the submersible repair platform 6, in which distributors and control boards are located. The absence of liquid from the holding pool from entering the internal cavity of the boxes is ensured by the use of a lid seal made of polyurethane material, as well as a system for maintaining internal excess pressure. The electronic components of the distributors and control boards are protected from radiation by a lead sheath placed around the perimeter of the boxes on the inside.

The delivery platform in one of the embodiments 1 includes a platform, a traverse and a control system, and is equipped with a trolley for installing a mechanism for fastening, holding, raising and lowering the actuator. The delivery platform is made in the form of a collapsible frame-and-beam structure, equipped with guides for moving a trolley installed on them. The trolley body is made of standard rolled profiles. The trolley movement mechanism is mounted on the trolley body.

The system for repairing the cooling pond lining is equipped with position sensors and feedback sensors installed on the transport platform and the submersible repair platform.

The system for repairing the cooling pond lining is equipped with a drive for extending the working modules.

The leak sealing device is made in the form of a small-sized welding installation connected to welding equipment 5. The small-sized welding installation of a system for repairing the lining of a soaking pool includes a rectifier on a trolley, a control unit including a pressure compensation system, connecting signal and power cables, a movable unit including a receiving motor - a gearbox, an oscillating device, a base unit, including a sealed stainless steel housing, a pressure sensor, a spool of welding wire, a wire feed drive and a wire locking device.

The system for repairing pool lining works as follows. If a leak of more than 30 l/day is detected through one of the cladding sections, a decision is made to carry out repair work, and the section to be repaired, if necessary, is cleared from the racks. The system is delivered to the spent fuel pool for repair. The delivery platform 1 is being installed on the rail track of the reloading machine. Then the system for repairing the cooling pond is connected to the electrical and pneumatic networks. After which the actuator is lowered into the spent fuel pool, positioning it opposite the leak detection site. The submersible repair platform 6 is positioned and suctioned onto the surface using vacuum suction cups 9.

Using an ultrasonic testing device, a defect is searched. In this case, the submersible repair platform 6 is installed so that the working area of the actuator is in the corner of the section. Areas with welds are scanned first, then sheet metal is scanned. If there is no defect, the submersible repair platform moves to the adjacent area (overlap area). Areas are scanned in columns or in a spiral.

The submersible repair platform 6 is finally positioned so that the working area completely covers the found defect, if the defect is found after several installations. The defect is recognized, then the defect is cleaned, and then the defect is welded along a given trajectory, and the stress relief areas are welded first. The melted end of the welding wire is cut off by a wire cutter. The completed weld is inspected and then the weld is cleaned. After that, ultrasonic control of the completed surfacing is carried out.

To control the quality of the repairs carried out, the absence of liquid is checked or the amount of leaked liquid is checked in the leak collection system. Using a device for treating welded seams and the surface of the decontamination pool, waste from repairs is removed.

Similar to the above-described system for repairing the cooling pond, the complex for repairing the lining of the cooling pond for carrying out work at depth in the cooling pond is equipped with devices that are not immersed in the cooling pond, schematically shown in Fig. 1 and including pneumatic equipment 2, electrical control cabinet 3, control panel 4 with an ultrasonic flaw detector and welding equipment 5.

The devices immersed in the cooling pool in this embodiment are the submersible repair robot shown in FIG. 3, with an executive unit and working modules located on a submersible repair robot.

In turn, the executive unit is equipped with a servo drive, an ultrasonic control head and a video surveillance device.

The submersible repair robot is equipped with a transport platform 11, on which a platform with working modules is located.

The transport platform 11 is equipped with means of fixation to the surface of the cooling pool, made in the form of vacuum suction cups 12.

The executive unit is equipped with drives with translational or rotational movement of the output link, an ultrasonic control head, a video surveillance device 13, a device for collecting waste during grinding, including a pump with a drive and a filter, a manipulator 14 with servo drives and drives for its movement, a stripping device, a device 15 leak sealing, made in the form of a small-sized welding installation connected to welding equipment 5. The complex for repairing the lining of the spent fuel pool can be equipped with a drive 16 for extending the working modules and a control system 17 for the executive unit.

Delivery platform 1 in another embodiment structurally consists of a platform bridge, a control system, and a traverse for securing a submersible repair robot. The delivery platform 1 is equipped with a trolley for installing a mechanism for fastening, holding, raising and lowering the actuator, a mechanism for moving the trolley and is made in the form of a collapsible frame-beam structure equipped with guides for moving the trolley installed on them.

The submersible repair robot is equipped with control boxes in which distributors and control boards are located.

The absence of liquid from the holding pool from entering the internal cavity of the boxes is ensured by the use of a lid seal made of polyurethane material, as well as a system for maintaining internal excess pressure. The electronic components of the distributors and control boards are protected from radiation by a lead sheath placed around the perimeter of the boxes on the inside.

The complex for repairing the cooling pond lining is equipped with position sensors and feedback sensors installed on the transport platform and the submersible repair robot.

A small-sized welding installation of a complex for repairing the lining of a soaking pool includes a rectifier on a trolley, a control unit including a pressure compensation system, connecting signal and power cables, a movable unit including a receiving gear motor, an oscillating device, a base unit including a sealed stainless steel housing, pressure sensor, welding wire spool, wire feed drive and wire locking device.

The complex for repairing the lining of the soaking pool is also equipped with a device for biting off the wire after welding work before performing the next welding.

The operation of the pool lining repair complex is carried out as follows. Upon discovery

Claims (5)

If a leak of more than 30 l/day is detected through one of the cladding sections, a decision is made to carry out repair work, and the section to be repaired, if necessary, is cleared from the racks. The repair complex is delivered to the spent fuel pool. The delivery platform 1 is being installed on the rail track of the reloading machine. Then the complex for repairing the spent fuel pool is connected to electrical and pneumatic networks. Then, using cables attached to winches, the submersible repair robot is lowered into the spent fuel pool, positioning it opposite the leak detection site. The submersible repair robot, using vacuum suction cups 12, is positioned and suctioned onto the surface of the spent fuel pool. Using an ultrasonic testing device, a defect is searched. In this case, the submersible repair robot is installed so that its working area is in the corner of the section. Areas with welds are scanned first, then sheet metal is scanned. If there is no defect, the submersible repair robot moves to the adjacent area (overlap area). Areas are scanned in columns or in a spiral. The submersible repair robot 6 is finally positioned so that the working area completely covers the found defect, if the defect is found after several installations. The defect is recognized, then the defect is cleaned, and then surfacing is carried out at the defect location along a given trajectory, and the stress relief areas are welded first. The weld deposit is inspected and then the deposited seam is cleaned. After this, ultrasonic inspection of the completed surfacing or video inspection using high-resolution TV is carried out. To control the quality of the repairs carried out, the absence of liquid is checked or the amount of leaked liquid is checked in the leak collection system. In general, the complex and system for repairing pool linings are a set of devices that operate remotely in an aggressive environment, taking into account the radiation component, and carry out repair operations according to a given program. CLAIM 1. A system for repairing the lining of a cooling pond, mainly the walls and bottom, containing a delivery device, an actuator, including a module for searching and locating a leak, and working modules containing a cleaning device, a leak sealing device, means for fixing the actuator, a fastening and holding mechanism, lifting and lowering of the actuator and a remote control device, characterized in that the system for repairing the cooling pond lining is additionally equipped with devices that are not immersed in the cooling pond, including pneumatic and electrical equipment, an electrical control cabinet, a control panel with an ultrasonic flaw detector and welding equipment, and submersible into the cooling pond with devices including a submersible repair platform for placing the actuator, and the actuator is equipped with a servo drive, an ultrasonic control head, a video surveillance device, a device for treating welds and the surface of the cooling pond from contamination, a device for cutting wire, including a container for collecting scraps and a pump for collecting particles, the delivery device is made in the form of a delivery platform and is equipped with a trolley for installing a mechanism for fastening, holding, raising and lowering the actuator and a mechanism for moving the trolley, the delivery platform is made in the form of a collapsible frame-beam structure, equipped with guides for moving installed on of them are carts, the submersible repair platform is made of an outer frame and an internal frame installed with the possibility of mutual movement and fixation, and is connected to the delivery platform, the leak sealing device is made in the form of a small-sized welding installation connected to the welding equipment, and the submersible repair platform is equipped with means for its fixation to the surface of the cooling pool. 2. A system for repairing the cooling pond lining according to claim 1, characterized in that the means for fixing the submersible repair platform are made in the form of vacuum suction cups and/or conical guides. 3. A system for repairing the cooling pond lining according to claim 1, characterized in that it is equipped with a drive for extending the working modules. 4. A system for repairing the cooling pond lining according to claim 1, characterized in that it is equipped with position sensors and feedback sensors installed on the transport platform and the submersible repair platform. 5. The system for repairing the lining of a soaking pool according to claim 1, characterized in that the small-sized welding installation includes a rectifier on a trolley, a control unit including a pressure compensation system, connecting signal and power cables, a movable unit including a receiving gear motor, an oscillating device , a basic unit, including a sealed stainless steel housing, a pressure sensor, a spool of welding wire, a wire feed drive and -