The automatic production line of fuel elements

 

The invention relates to nuclear energy and may find application in the manufacturing of fuel elements for fuel assemblies of nuclear power reactors. The technical result of the invention is to improve the quality of fabrication of fuel elements. Between the cutter-emphasis of the beginning of the column of fuel pellets and the cutter-clamp the end of the post device vibrating equipment from the top and sides for the entire length of the pillars of the tablets that are on the horizontal cradle countertops, installed units with collimation channelsquanta equipped photoelectron multipliers, spectrometers and computer data output parameters enrichment and detection tablets with deviations of enrichment for the235U from the set and their location in the column of fuel pellets. Collimation channels placed offset to each other. 1 C.p. f-crystals, 3 ill.

The invention relates to the nuclear industry and can find application in the manufacturing of fuel elements for nuclear reactors.

Known automatic line technology the welding stub to one end of the shell, vibrating equipment column of fuel pellets in the open end of the shell, comprising a vibratory feeder feed fuel pellets on a horizontal cradle for the formation of the pillars of fuel pellets, the selectors-stops beginning of the pillars, and cut off the clamps of the ends of the pillars fuel pellets, a Desk with a cradle for laying them in the shells open ends toward and aligned with the pillars of fuel pellets with the mechanisms of installation and removal of loaded shells, Stripping the open end of a filled shell, measuring the length of a column of fuel pellets,

- mounting clamps into the open end of the filled shell,

- sealing by welding the caps to the open end of the filled shell under the pressure of the inert gas under cover,

control and inspection pressure within the shell (hereafter Fe) and by the presence of internal components,

- surface treatment of TVEL, vehicle wiring TVEL device-to-device output defective TVEL and automation system (see Russian Federation patent No. 2070740, IPC G 21 21/02 from 17.05.1994,, publ. 20.12.1996,).

On the well-known lines may produce either Fuel for WWER-1000, or the Fuel of VVER-440, as they are different lengths (3837 ¡internal components in the famous lines is performed after the sealing of a fuel rod, i.e. if the control fuel element mismatch is detected by the presence of internal components, you will need rasteklovki of a fuel rod and remove fuel pellets with a spike at the marriage of the shell.

According to the fuel Rods for the normal operation of a nuclear reactor, avoid distortions in the neutron and temperature fields in each fuel rod must be strictly specified number of nuclear fuel (fissile isotope) and uniform distribution along the length of the fuel element.

The equipment of the fuel Rods must do fuel pellets from a strictly specified enrichment of uranium 235, strictly defined length of the column of fuel pellets, density and a given weight of fuel in a fuel rod (see Development, production and operation of fuel cell power reactors. Book 2. Edited by F. G. Reshetnikov. - M.: Energoatomizdat, 1995, S. 283).

These requirements known to the automatic production line of the fuel element does not match, because not determined the enrichment of uranium 235 fuel pellets loaded shell. It is not excluded from entering when the equipment is one kind of fortification tablets of different enrichment for mass production.

Closest to the technical essence and dostigaemye to the equipment with welding stub to one end of the shell and weighing

- vibration equipment column of fuel pellets in the open end of the shell, comprising a vibratory feeder feed fuel pellets on a horizontal cradle countertops with clipper-emphasis of the beginning of the pillars and the cutter-clamp the end of the pillars of fuel pellets adjacent to the table top Desk with a cradle styling shells open ends of the aligned columns of fuel pellets with the mechanisms of laying, feeding on the equipment and removing the filled shells, cleaning, pressing, clamps, control and inspection on the internal components and the means of posting on the seal,

- sealing by welding the caps to the open end of the filled shell under the pressure of the inert gas under the shell, control and sorting in the pressure inside the shell of a fuel rod, ultrasonic weld inspection,

- surface treatment of the Fuel rod is provided with a detachable extension tubes for fuel Rods of a nuclear reactor VVER-440, by means of wiring device-to-device output defective fuel elements and system automation (see Russian Federation patent RU 2155395, IPC 7 G 21 C 21/02 from 17.02.1999,, publ. 27 August 2000).

Automatic line-prototype eliminates the disadvantages of the known line in terms of expanding technologies what about the internal components to seal the filled shell, that allows you to take prompt action without moving the sheath in a marriage that took place in the famous line.

However, in the automatic line-prototype does not provide the control and detection of fuel pellets with other enrichment235U in the column of fuel pellets, other than the specified fuel pellets enriched in235U, there is no control total content235U in the fuel Rods. Known passive method based on Deskquanta emitted by the235U, has several disadvantages (the influence of the isotopic composition, the slowdown in the fuel and cladding, low output, and so on), which he has not found wide application (see Development, production and operation of fuel cell power reactors. Book 2. Edited by F. G. Reshetnikov. - M.: Energoatomizdat, 1995, S. 283-284).

The technical challenge is to improve the quality of fabrication of fuel elements by control and rejection of fuel pellets with different from the predetermined enrichment235U and determine the total content of235U in the column of fuel pellets, snaryazhenya in the fuel cladding while maintaining the rhythm of release of fuel elementsto:

- preparation of the membrane to the equipment with its weighing and welding stub to one end of the shell with a removable extension for TVEL water-cooled power reactor 440,

- vibration equipment column of fuel pellets in the open end of the shell, comprising a vibratory feeder feed fuel pellets on a horizontal cradle with clipper-emphasis of the beginning of the pillars and the cutter-clamp the end of the pillars of fuel pellets adjacent to the table top Desk with a cradle styling shells open ends of the aligned columns of fuel pellets with the mechanisms of laying, feeding on the equipment and removing the filled shells, cleaning, pressing, clamps, control and inspection on the internal components and the means posting on a seal in the form of a roller table,

- sealing by welding the caps to the open end of the filled shell under the pressure of the inert gas under the shell, control and sorting in the pressure inside the shell of a fuel rod, ultrasonic weld inspection,

- surface treatment of Fuel elements,

- funds transaction device-to-device output defective fuel elements and system automation;

according to the invention between the cutter-emphasis of the beginning of the pillars and adequate is the entire length of the pillars of fuel pellets, located on a horizontal cradle countertops, installed units with collimation channelsquanta emitted by the235U fuel pellets, install automatic monitoring parameters enrichment235U and the total content of235U in the fuel pellets fuel elements for light water power reactor 1000, 440, the number of detection units along the length of the column of fuel pellets are insufficient to ensure the velocity of fuel pellets in saraguay shell according to the rhythm of the production of fuel elements and the detection units are equipped with photoelectron multipliers, spectrometers and computer data output parameters enrichment and detection of fuel pellets with a deviation of enrichment for the235U from a given enrichment and their location in the column of fuel pellets.

Another difference is that collimation channels of detection units relative to each other along the length of the column of fuel pellets are placed with an offset.

This embodiment would allow for control of fuel pellets to their equipment in the shell, carried out a technical problem.

The drawings show the automatic production line of fuel elements, where

in Fig.1 - General view of the line,

in Fig.2 - the device vibrating equipment,

in Fig.3 - installation of automatic control (versions 1 and 2).

The automatic production line of fuel elements contains devices: preparation of 1 shell 2 to the equipment with welding 3 stub 4 to one end of the shell 2 with its weighting 5, vibrating equipment 6 of the column of fuel pellets 7 in the open end of the shell 2, which includes a vibratory feeder 8 supply of fuel pellets 7 on a horizontal cradle 9 of the table top 10 with the cutter-focus 11 the beginning of the pillars and the cutter-clamp 12 at the end of posts fuel pellets 7 adjacent to the top of the table 13 with the cradle styling shells 2 open ends of the aligned columns of fuel pellets 7 machinery installation, of feeding on the equipment and removing the filled shells 2 (not specified), 14 cleaning, pressing, 15 clamps 16, control and inspection on the internal components 17 and the tool 18 posting on the seal, the seal 19 welding stub 20 to the open end of the filled shell 2 under the pressure of the inert gas under the shell 2, the control and inspection on 21 deesta wiring device-to-device o defective TVEL and automation system (not shown).

Option 1.

Between the cutter-focus 11 the beginning of the pillars and the cutter-clamp 12 at the end of posts fuel pellets 7 of the device 6 vibrating equipment from the top and sides for the entire length of the column of fuel pellets 7 installed blocks 24 detectionquanta emitted by the235U fuel pellets 7 installation of automatic control parameters enrichment235U and the total content of235U in the fuel pellets 7 fuel elements for light water power reactor 1000, 440.

The number of blocks 24 detection along the length of the column of fuel pellets 7 installed sufficient to ensure the velocity of fuel pellets 7 saraguay shell 2 according to the rhythm of release of the fuel rod and the blocks 24 of the detection is supplied photoelectron multipliers 25, spectrometers 26 and the computer 27 of the data output by the parameters of the enrichment and detection of fuel pellets 7 deviation of enrichment235U from a given enrichment and their location in the column of fuel pellets 7.

Option 2.

Collimation channels 28 units 24 detection relative to each drugshere extension 29.

The automatic production line TVEL works as follows.

After the device 1 preparation of membranes 2 to the equipment with welding 3 stub 4 to one end of the shell 2 and weighing 5 shell 2 is directed to the device 6 vibrating equipment column of fuel pellets 7 in the open end of the shell 2. The flow of fuel pellets 7 vibratory equipment is carried out on the vibratory feeder 8 on a horizontal cradle 9 of the table top 10 with a closed clipper-emphasis 11 and the open cutter-clamp 12 to the formation of six parallel columns of fuel pellets 7. Closes the cutter-clamp 12, opens the clipper-the stop 11 and the pillars of fuel pellets under the action of vibration are moved into the open ends of the shells 2, placed on the cradle table 13 adjacent to the top 10.

Vibratory movement of the column of fuel pellets 7 control and culling fuel pellets 7, differing from the predetermined enrichment235U, determine the total content of235U in the column of fuel pellets 7, snaryazhenya in the shell 2 fuel element while maintaining the rhythm of release of the fuel element.

Control based on the detection of the detection unit 24, astenospheric235U fuel pellets 7.

Control are the pillars of fuel pellets 7 for the fuel elements for light water power reactors VVER-1000, 440. The signals from blocks 24 detection via photomultipliers 25, spectrometers 26 are received in the computer 27 issuance data to identify fuel pellets 7 deviation of enrichment on235U from a given enrichment and their location in the column of fuel pellets 7, and the total content235U.

Collimation channels 28 units 24 detection relative to each other along the length of the column of fuel pellets 7 can be placed at an offset. Curb shell 2 after fitting 15 clamps 16, 14 cleaning the open end of the shell 2 from dust fuel pellets are subjected to testing and grading 17 to the internal components and the tool 18 is transported to the sealing 19, where the plug 20 is sealed by this welding to the open end of the filled shell 2 (hereafter FE) under pressure of inert gas (helium) under the shell.

TVEL is subjected to the control and selection pressure 21 and ultrasonic testing 22 weld and surface treatment 23.

In the manufacture of fuel elements for water-water energyline TVEL VVER-1000 to produce the Fuel of VVER-440.

Claims

1. The automatic production line of fuel elements containing preparation device shell to the equipment with its weighing and welding stub to one end of the shell with a removable extension tube for fuel element for water water energy reactor 440, vibrating equipment column of fuel pellets in the open end of the shell, comprising a vibratory feeder feed fuel pellets on a horizontal cradle countertops with clipper-emphasis of the beginning of the pillars and the cutter-clamp the end of the pillars of fuel pellets adjacent to the table top Desk with a cradle styling shells open ends of the aligned columns of fuel pellets with the mechanisms of laying, feeding on the equipment and removing the filled shells, cleaning, pressing, retainers, control and inspection on the internal components and the means posting on a seal in the form of a roller, seal welding the caps to the open end of the filled shell under the pressure of the inert gas under cover (in the future, fuel cell), control and inspection pressure within the fuel cladding, ultrasonic testing of weld surface the different fuel elements and system automation characterized in that between the cutter-emphasis of the beginning of the pillars of fuel pellets and the cutter-clamp the end of the pillars of fuel pellets device vibrating equipment from the top and sides for the entire length of the pillars of fuel pellets located on the horizontal cradle countertops, installed units with collimation channelsquanta emitted by the235U fuel pellets, install automatic monitoring parameters enrichment235U and the total content of235U in the fuel pellets fuel elements for the water water energy reactor 1000, 440, the number of detection units along the length of the column of fuel pellets are insufficient to ensure the velocity of fuel pellets in saraguay shell according to the rhythm of the production of fuel elements, and the detection units are equipped with photoelectron multipliers, spectrometers and computer data output parameters enrichment and detection of fuel pellets with a deviation of enrichment for the235U from a given enrichment and their location in the column of fuel pellets.

2. Automatic line is Tolba fuel pellets are placed with an offset.

 

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