RU2459U1 - DEVICE FOR REPAIR OF GRAPHITE LAYING OF THE ACTIVE ZONE OF A CHANNEL NUCLEAR REACTOR - Google Patents

Abstract

A device for repairing the graphite masonry of the core of a channel nuclear reactor, containing a casing pipe with an expanding collet and a working rod, characterized in that the working rod is made in the form of a pipe with an air nozzle at the lower end, located at an angle to the pipe axis, and located inside the pipe thrust with a stylus extending through the nozzle, and the pipe is installed with the possibility of its longitudinal movement and circular rotation from independent drives.

Description

UsyarSGVO FOR REPAIR OF GRAPHITE LAYING OF THE ACTIVE ZONE OF THE CHANNEL NUCLEAR REACTOR.

The proposed useful gudel belongs to the field of nuclear energy, and relates, in particular, to the operation of nuclear reactors and can be used for major and preventive repairs.

The need to solve this problem arose due to the fact that when the technological channel is removed from the reactor, graphite rings and bushings fixed on the channel are destroyed due to strong compression by graphite blocks during the extraction process, while fragments of the destroyed rings fall between the ends of the graphite blocks. Before installing a new process channel, all joints of a graphite column must be carefully cleaned of graphite debris and dust.

Known devices for repairing and restoring cells of masonry columns of the core of a channel nuclear reactor.

RF patent No. 2022725 proposes a device for processing holes, an L-containing casing pipe, a working rod with a cutting unit fixed to it, and a suction unit for graphite chips. The cutting unit is made in the core drill with the possibility of oscillation relative to the axis of the rod. This design of the device, for processing holes, allows to send the quality of processing holes, allows you to improve the quality of processing the inner surface of the graphite cell. The disadvantage of this

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design is the incomplete removal of graphite chips from the cells of the columns.

A device is also known, according to the patent of the Russian Federation No. 2029997 2j, containing a bar with an expanding collet and a working tool, which is introduced into the trellis through the central channel of the graphite column, with which the masonry column is raised and fixed, the defective block is crushed and removed, then the masonry is lowered and the cavity formed in the upper part of the masonry is filled with elements of a new block. This device allows you to improve the quality and productivity of repair masonry. The disadvantage of this device is also the incomplete removal of accident products from the masonry core.

IfeBecTHO is also a device for repairing graphite masonry, according to RF patent No. 2035071 s, containing a rod with an expanding collet and a working tool by means of which each graphite block is lifted and fixed, and accident products are removed from the gaps between the columns of graphite blocks, while the graphite blocks are rearranged into the free space of the emergency cell. This device allows you to restore the original operational characteristics of the reactor. The disadvantage of this method is the low productivity, high labor costs.

The closest analogue of this technical solution is a device for crushing defective graphite blocks; masonry of a nuclear uranium-graphite reactor, according to RF patent No. 2027234 43, including a casing with an expanding collet and a working tool for crushing, made in the form of a chipping hammer with a replaceable working body) m connected to the copier, moreover, the axis of attachment of the housing is pneumatic,

the hammer is offset relative to the longitudinal axis of the casing. This solution allows to significantly improve the quality of crushing and removal of accident products.

(The advantage of this solution is that it does not completely remove the accident products from the masonry of the reactor core, since there is no special tool for cleaning the joints of the blocks of graphite columns. This leads to overheating and destruction of the graphite masonry of the core of the channel nuclear reactor.

The problem solved by the proposed technical solution is to ensure the complete removal of accident products from the joints of blocks of graphite columns.

The essence of the claimed technical solution lies in the fact that in the device for repairing the graphite masonry of the core of a channel nuclear reactor containing a casing pipe with an expanding collet and a working rod, the working rod is made in the form of a pipe with an air nozzle in the nickname end, located at an angle to the axis of the pipe, and a rod located inside the pipe with a dipstick through the nozzle, the pipe being installed with the possibility of its longitudinal curling and circular rotation, by means of self-contained drives.

This const | An active solution will improve the quality and productivity of processing joints of blocks of graphite columns, t, k, in the process of longitudinal movement and circular rotation of the pipe with an air nozzle, air flowing out of the nozzle blows out dust and small fragments of accident products. In the case when the air stream cannot move individual cus9 low (

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-game graphite and mechanical impact is required, use traction with a probe to push these pieces out of the joints of blocks of graphite columns,

FIG. 1 shows a cross-sectional view of the general type of device for repairing the graphite masonry of the core of a channel nuclear reactor installed in the path of a process channel.

A device for repairing graphite masonry in the core of a channel nuclear reactor (FIGL) contains a long casing I, for gripping and holding a column of graphite blocks in an elevated position and operating rod 2, for removing graphite debris from the joints of blocks of graphite masonry. The casing pipe I is made of two pipes outer 3 to inner 4 placed one into the other with the possibility of their free movement relative to each other. The working rod 2 is made of an outer pipe 5 and a rod 6 located inside the pipe 5. Features, the working rod 2 is placed B1 inside the casing I. The outer pipe 3 of the casing I in the lower part contains a collet 7, in the upper part it is connected to the piston 8 of the pneumatic cylinder 9 The inner pipe 4 of the casing I in the lower part is provided with a stop 10, in the upper - a flange II, through which it

connected to the gearbox 12. The gearbox 12 contains two electric drives: an axial displacement electric drive and a rotation electric drive (not indicated by a separate position). The axial displacement electric drive consists of an electric motor 13, a gear pair 14, one of the gears of which is threaded to the outer tube 5 of the working rod 2. The rotation electric drive consists of an electric motor 15, a planetary gear 16, a gear pair 17, one of which has gears S is connected to the outer pipe 5 by a sliding key 18. The outer pipe 5 of the working rod 2 in the lower part contains an air nozzle 19 and a small-sized television camera 20 attached to it, in the upper one there is a threaded sleeve 21 reduction motor 22, gears 23 of which are coupled to rod 24 of rod 6. Rod 6 contains a steel probe 25 in the lower part and a double-sided rod in the top 24. Working as a device for repairing the graphite masonry of the core of a channel nuclear reactor is as follows. The device is hung on a hook crane (not shown in figure 1). Compressed air is supplied to the pneumatic cylinder 9 - the piston 8 goes up - the collet 7 is compressed (transport position). The device is found in the cell of the masonry core of the reactor. Using a television camera 20 visually determine the junction of the blocks of graphite columns 26 requiring cleaning. Then, air is discharged from the pneumatic clincher 9, while the collet 7 is unclenched and the graphite column block 26 is captured. With the help of a crane, the device is lifted, while the inner pipe 4 of the casing pipe I moves relative to the outer pipe 3. The stop 10 of the pipe 4 fixes | Collet 7. In case of further lifting of the device, the column of graphite blocks is moved to a height H and held in a raised position for further operations. The electric drive of the axial movement of the outer pipe 5 is turned on, while, by means of an electric motor 13 connected to the gear pair 14, the outer pipe 5 of the working rod 2 is lowered into the cleaning zone. Then, compressed air is supplied for the sale / taste of the JOINTS of the graphite column blocks through the air nozzle 19, and the electric drive is turned on: rotation, while using the electric motor 15, the planetary gear 16, the gear pair 17, the outer pipe 5 is rotated with the nozzle 19 about its axis At the same time, blowing of dust and small fragments of accident products is ensured. The purge operation is carried out until the dust and graphite chips are completely removed from the surface of the joints of the blocks of the graphite columns, if the mechanical impact on the fragments of graphite is necessary, the motor reducer is switched on. In this case, by means of gear 3, rack 24, change nozzle 19

the outer pipe 5 with the nozzle 19 is rotated by the required value and, by means of step 25, the pieces of graphite are displaced. The progress of the operation is observed visually according to the image on the screen of the television installation using a small-sized television camera 20. Using a load-lifting crane, lower the column of graphite blocks together with the device to its original position. Then, compressed air is supplied to the pneumatic cylinder 9 — the collet 7 is brought into transport position. Using a crane, the device is removed from the graphite masonry cell.

As a result of the removal of accident products from the joints of blocks of graphite columns using the proposed device, the restoration of the initial operational characteristics of the reactor and its economic indicators is achieved, the complete removal of residues of accident products from the joints of blocks of graphite columns is guaranteed.

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Claims (1)

A device for repairing graphite masonry in the core of a channel nuclear reactor, comprising a casing with an expanding collet and a working rod, characterized in that the working rod is made in the form of a pipe with an air nozzle in the lower end located at an angle to the axis of the pipe and placed inside the thrust pipe with a probe extended through the nozzle, and the pipe is installed with the possibility of its longitudinal movement and circular rotation from autonomous drives.