METHOD OF SPLICING LONG-LENGTH ELEMENTS OF A NUCLEAR REACTOR INTO FRAGMENTS AND DEVICE FOR ITS IMPLEMENTATION

Abstract

The invention relates to the field of nuclear technology, in particular, to the disposal of spent long-length elements of a nuclear reactor. The invention reduces the complexity and time required to splice long-length elements and minimizes dose loads on attendants. The method of splicing long-length elements of a nuclear reactor into fragments involves placement of long-length elements inside the container and subsequent cutting. The long element is lowered into the container to its full height and cut on the level of the upper edge of the container with the separation from it of a fragment equal to the height of the container, then the upper part of the long-length element remaining after cutting is lowered inside the container to its full height and the cutting of the long-length element into fragments is repeated until it is fully spliced.

Description

The invention relates to the field of nuclear technology, in particular, to the disposal of spent long-length elements of a nuclear reactor, and can be used at nuclear power plants or special plants.

When decommissioning nuclear power units, it becomes necessary to splice the technological equipment of a nuclear reactor, including long-length elements in the compartments of cavities of vessel internals, cooling pond of water-water energetic reactors into fragments.

Splicing of long-length elements into fragments is carried out by mechanical methods, such as saws, disk cutters, turning tools, etc., or by thermal methods, such as gas, plasma, spark cutting, etc. Devices are developed, by which these methods of fragmentation are performed.

There is a method of splicing a two-beam fuel assembly of a nuclear reactor and a splicing device for its implementation according to the patent of the Russian Federation No. 2080665, IPC (International patent classification) G21C 19/00, G21F 7/00. This method includes the installation and fixation of the fuel assembly in a foldable case placed in a housing installed in a reservoir filled with water at a depth providing biological protection. This method involves splicing the spent assembly to ensure compact storage in the spent nuclear fuel storage.

The drawback of this method is the complexity and duration of the preparation of equipment and work.

The closest analogue of the claimed invention is the “Method of cutting lengthy elements of a nuclear reactor” invention according to the patent of Russian Federation No 2125308, IPC G21C 19/36. The method consists in splicing the waste long-length elements of a nuclear reactor (reactor channels, control rods, thermocouples of ionization chambers, power density sensors, etc.) by transverse cutting of these elements. Long-length elements are placed inside the container, which is used as the central part of the spent reactor channel, and they are cut together.

The drawback of the closest analogue is the complexity and duration of the splicing of long-length elements.

The problem solved by the present invention is the enhancement.

The technical result achieved by the invention, is to reduce the complexity and time of work on the splicing of long-length elements, as well as to minimize the dose loads on the attendants.

The said technical result, regarding the method, is achieved due to the fact that in the method of splicing of long-length elements of a nuclear reactor into fragments, including the placement of long-length elements inside the container and their subsequent cutting, it has been proposed to lower the long element into the container to its full height, to cut the long-length element on the level of the upper edge of the container with the separation from it of a fragment equal to the height of the container, then lower the upper part of the long-length element remaining after cutting inside the container to its full height and repeat cutting the long-length element into fragments until it is fully spliced.

It is also proposed to carry out the splicing of -long-length elements until the container is completely filled, and then the container, after filling it with fragments of long-length elements, is moved to the storage location. In addition, it is proposed to carry out the splicing of long-length elements with remote control in a process reservoir under water, the version of the container must be perforated. It is proposed to remotely control the splicing of long-length elements in the process reservoir using video surveillance and artificial lighting.

The said technical result, concerning the device, is achieved due to the fact that the device for splicing the long-length elements of a nuclear reactor into fragments, including a lock located in the process reservoir, a container installed therein and equipment for moving and cutting long-length elements of a nuclear reactor, is proposed to be additionally equipped with video surveillance devices located in the process reservoir, to execute the container lock in the form of the fixed boom with container holder, installed on the bottom of the process reservoir, to execute equipment for cutting a long-length element as a remotely controlled hydraulic cutter mounted with the possibility of movement on a fixed boom above the container holder, and execute equipment to move a long-length element in the form of a remotely controlled gripping device with clamping jaws, mounted on a movable boom.

It is also proposed to make the container holder in the form of a ring, to provide a gripping device with an actuator ensuring the rotation of the clamping jaws. In addition, it has been proposed to provide a video surveillance system with a general vision camera and a video camera mounted on the gripping device, and a video camera or a rigid lensed radiation-resistant endoscope mounted on a fixed boom. It is proposed to place the floodlight lamp, and execute the container with perforated bottom and/or walls, in the process reservoir.

Changing the method of splicing of long-length elements, in which the splicing is carried out in the same container before it is filled, and all operations are carried out under water, leads to the achievement of the specified technical result.

The claimed group of inventions is illustrated with graphic material, where in FIG. 1 a device for splicing of long-length elements of a nuclear reactor into fragments is shown.

A device for splicing of long-length elements of a nuclear reactor into fragments includes a container 1 holder executed in the form of a fixed boom 3 mounted on the bottom of the process reservoir 2 filled with water, with a holder 4 of container 1, installed in the holder 4 of a container 1, and equipment for moving and cutting long-length elements 5. The equipment for moving long-length elements 5 consists of a remotely controlled gripping device 7 with clamping jaws 8 mounted on a movable boom 6, and the equipment for cutting long-length elements 5 consists of a remotely controlled hydraulic cutter 9 mounted for movement on a fixed boom 3 above the container 1 holder 4. The holder 4 of the container 1 in FIG. 1 is executed as a ring. The gripping device 7 is equipped with an actuator 10, providing rotation of the clamping jaws 8. Also, the device for splicing of long-length elements 5 into fragments includes a floodlight lamp 11, a general vision video camera 12 and a video camera 13 mounted on the gripping device 7. On FIG. 1 a embodiment with a rigid lensed radiation-resistant endoscope 14 mounted on a fixed boom 3 is presented.

Thus, the operation of the device and the method of splicing long-length elements of a nuclear reactor into fragments is carried out as follows.

The container 1 for placing long-length elements 5 is installed in the holder 4 on the fixed boom 3. Using the gripping device 7 with the clamping jaws 8, the long-length element 5 is gripped in the process reservoir 2, performing the surveillance with the help of the video camera 13. Then, the long-length element 5 is lowered into the container 1 with the help of the gripping device 7 to the full height of the container 1, the long-length element 5 is picked up at the level of the upper edge of the container 1, is lifted and positioned so that the hydraulic cutter 9 is directly under the clamping jaws 8 provided that the positioning is carried out using a rigid lensed radiation-resistant endoscope 14 mounted on a fixed boom 3. Then the cutting of the long-length element 5 with the separation of a fragment from it is performed and the operation of installing the remaining upper part of the long-length element 5 into the container 1, picking up and cutting of the long-length element 5 to the full splicing, are repeated again. Then using the gripping device 7 the grip of the following long-length element 5 in the process reservoir 2 is performed and splicing until the container 1 is filled is performed. All operations are carried out in a process reservoir 2 filled with water with video surveillance using a video camera 12 for general vision and additional lighting with the help of a floodlight lamp 11. For water drainage a perforated container 1 is used. After filling with fragments of long-length elements 5, the container 1 is moved to the storage location.

The claimed group of inventions provides a reduction in labour intensity, work completion time and minimization of dose loads on the attendants when splicing long-length radioactive elements of a nuclear reactor.

Claims

1. A method of splicing of long-length elements of a nuclear reactor into fragments, including the placement of long-length elements inside the container and their subsequent cutting, wherein the long-length element is lowered into the container to its full height, the long-length element is cut on the level of the upper edge of the container with the separation from it of a fragment equal to the height of the container, then the upper part of the long-length element remaining after cutting inside the container is lowered to its full height and the cutting of long-length element into fragments until it is fully spliced, is repeated.

2. A method of splicing long-length elements of a nuclear reactor into fragments according to claim 1, wherein the splicing of long-length elements is carried out until the container is completely filled.

3. A method of splicing long-length elements of a nuclear reactor into fragments, according to claim 1 or 2, wherein the container after its filling with fragments of long-length elements is moved to the storage location.

4. A method of splicing long-length elements of a nuclear reactor into fragments according to claim 1, wherein the splicing of long-length elements is carried out with remote control in the process reservoir under water.

5. A method of splicing long-length elements of a nuclear reactor into fragments according to claim 1, wherein the container is perforated.

6. A method of splicing long-length elements of a nuclear reactor into fragments according to claim 1, wherein the remote control long elements splicing in the process reservoir is carried out using video surveillance and artificial lighting.

7. A device for splicing the long-length elements of a nuclear reactor into fragments, including a lock located in the process reservoir, a container installed therein and equipment for moving and cutting long-length elements of a nuclear reactor, wherein to be additionally equipped with video surveillance devices located in the process reservoir, to execute the container lock in the form of the fixed boom with container holder, installed on the bottom of the process reservoir, to execute equipment for cutting a long-length element as a remotely controlled hydraulic cutter mounted with the possibility of movement on a fixed boom above the container holder, and execute equipment to move a long-length element in the form of a remotely controlled gripping device with clamping jaws, mounted on a movable boom.

8. A device for splicing long-length elements of a nuclear reactor into fragments according to claim 7, wherein the container holder is made in the form of a ring.

9. A device for splicing long-length elements of a nuclear reactor into fragments according to claim 7, wherein the gripping device is equipped with an actuator that ensures the rotation of the clamping jaws.

10. A device for splicing long-length elements of a nuclear reactor into fragments according to claim 7, wherein the video surveillance system includes a general vision camera and a video camera mounted on the gripping device and fixed boom.

11. A device for splicing long-length elements of a nuclear reactor into fragments according to claim 7, wherein the video surveillance system includes a general vision camera and a video camera mounted on the gripping device and a rigid lensed radiation-resistant endoscope mounted on a fixed boom.

12. A device for splicing long-length elements of a nuclear reactor into fragments according to claim 7, wherein the floodlight lamp is located in the process reservoir.

13. A device for splicing long-length elements of a nuclear reactor into fragments according to claim 7, wherein the container is perforated.