Device equipment automatic lines for manufacturing fuel elements

 

Device equipment automatic lines for manufacturing fuel elements intended for use in nuclear engineering. The device is equipped with a gauge length of free volume between the open end of the filled shell and a border of a column of fuel pellets in it and combined with it the puller fuel pellets of the column of fuel pellets through the open end of the filled shell. Inside the tube-meter length, free volume from the open end of the filled shell to the border of the column of fuel pellets placed coaxially movable rod-puller with a conical end. The latter interacts with the walls of the Central hole of the fuel pellet during its extraction from the column of fuel pellets. The tapered end of the rod puller is made with an angle of 4-5. Is removing the fuel pellets in running the shell without compromising the performance of automatic lines and no violations of process equipment. 1 C.p. f-crystals, 2 Il.

The invention relates to nuclear energy and may find application in equipment fuel pellets fuel elements (FE) dlda one of the main components of fuel elements (Cartridges), largely determine their performance in a nuclear reactor.

An important characteristic of the fuel pellets is their geometry, especially the height of the fuel pellets, however, in the process of manufacturing the height can vary. You know the manufacture of fuel pellets with chamfered edges and a Central hole (see Development, production and operation of fuel cell power reactors. Book 1. Edited by F. Reshetnikov, - M.: Energoatomizdat, 1995, S. 89, Fig. 4.3), the formation of fuel pellets in the column and gear it to the shell (see Development, production and operation of fuel cell power reactors. Book 2. Edited by F. Reshetnikov, - M.: Energoatomizdat, 1995, S. 159-161). However, due to fluctuations in fuel pellets at the height of the column of fuel pellets may be equal to, or less than, or greater than the defined length of the column. When forming the length of a column of fuel pellets is less than the specified length does not cause difficulties donnaregina fuel pellets or tablets to the defined length of the column, the formation length of a column of fuel pellets is greater than the specified length having difficulty removing the fuel pellets or tablets of curb Toronto equipment fuel elements in automatic lines for manufacturing fuel elements, includes top with a vibrator, with a horizontal cradle forming pillars of fuel pellets provided on one side with open ends of the shells, and on the other hand with vibratory feeder single-piece feed of fuel pellets on said cradles, provided with a cutter-emphasis of the beginning of the post and the cutter-clamp the end of the column of fuel pellets (see Patent 2070740 of the Russian Federation on the application 94018136 the Automatic production line of fuel elements from the may 17, 1994, publ. December 20, 1996, 6 IPC G 21 c 21/02).

Due to fluctuations in the height of the fuel pellets formed the pillars of fuel pellets in the cradle after clamping the cutter-clamp ends of the pillars fuel pellets will be either equal to, or less than, or greater than the defined lengths of the pillars of fuel pellets, and consequently curb fuel tablets shell will have inside the pillars of fuel pellets either equal to, or less than, or greater than the defined lengths of the pillars of fuel pellets.

According to the design development (see Development..., book 1, S. 45-46, Fig. 2.1) TVEL should be strictly limited by the height of the column of fuel pellets and strictly limited by the length of the free volume between the limit is the total accumulation of the gaseous fission products (Xe, CZK) when working in a nuclear reactor. If you do not get to the defined length of the column of the number of fuel pellets are easy to fill, the removal of unnecessary pills out of the shell is known difficulty, especially when mass production of automatic lines for manufacturing of Fuel elements.

Remove excess fuel pellets from the shell of her shaking, tilting towards the open end is unacceptable, since in such transactions will be broken gap between the fuel pellets, and subsequently, a fuel rod will be rejected by the gap between the fuel pellets and the total gap between the fuel pellets.

The technical challenge is to develop a device construction equipment fuel elements automatic line, allowing you to control the process equipment the length of the free volume between the open end of the filled shell and a border of a column of fuel pellets in it and remove the fuel pellets from the curb shell to the defined length of the column of fuel pellets in running the shell without compromising performance automatic line no violations of process equipment and without destroying recoverable fuel pellets.

This technichem countertop with a vibrator, with a horizontal cradle forming pillars of fuel pellets with a Central hole provided on one side with open ends of the shells, and on the other with vibratory feeder single-piece feed of fuel pellets on said cradles, provided with a cutter-emphasis of the beginning of the post and the cutter-clamp the end of the column of fuel pellets according to the invention the device equipment fuel elements automatic line is further provided with a gauge length of free volume between the open end of the filled shell and a border of a column of fuel pellets in it and combined with it the puller fuel pellets of the column of fuel pellets through the open end of the filled shell, made as movable in the axial direction with the possibility of entering into an open end of the filled shell tube-meter length, free volume from the open end of the filled shell to the border of the column of fuel pellets within which coaxile posted by movable rod-puller with a conical end that interacts with the walls of the Central hole of the fuel pellet during its extraction from the column of fuel pellets.

Another difference is the execution cone tor the free volume and puller fuel pellets allows you to control the length of the free volume in the shell, the length of the column of fuel pellets and remove the fuel pellets from the shell without compromising performance and quality of equipment of the column of fuel pellets.

The drawings show the device equipment automatic lines for manufacturing of fuel elements, in which Fig.1 - General view of the device with a combined meter and puller fuel pellets with automatic actuators of Fig.2 - meter puller fuel pellets manual execution.

Device equipment fuel elements 1 automatic line includes the top 2 with a vibrator 3 with a horizontal cradle 4 forming pillars of fuel pellets 5 with a Central hole 6 provided on one side with open ends of the shells 7 and on the other with the vibratory feeder 8 single-piece feed of fuel pellets 5 mentioned on the cradle 4, provided with a cutter-focus 9 the beginning of the column of fuel pellets 5 and the cutter-clamp 10 of the end of the column of fuel pellets 5.

Device equipment fuel elements 1 automatic line equipped with an additional meter 11 length of free volume between the open end of the filled shell 7 and the boundary of the column of fuel pellets 5 in it and sovmeshen the points 7, made as movable in the axial direction with the possibility of entering into an open end of the filled shell 7 tube-meter 11 length free volume from the open end of the filled shell 7 to the border of the column of fuel pellets 5, inside of which is placed coaxially movable rod-puller 12 with a tapered end that interacts with the walls of the Central hole 6 fuel tablets 5 when it is extracted from a column of fuel pellets 5.

The tapered end of the rod-puller 12 is made with an angleequal to 4-5.

Combined tube-meter 11 and the rod-puller 12 can be accomplished in two ways:

a) automatic actuator 13 of the rod-puller 12, automatic drive tube 14-meter 11, equipped with a movable block 15 and interacting with the sensor 16 of the path (see Fig.1);

b) with manual transmission 17 of the rod-puller 12, with manual transmission tube 18-gauge 11, where the rod-puller is spring-loaded in the cavity of the actuator 18, and the tube-meter inflicted dimensional division 19.

Device equipment automatic lines for manufacturing fuel elements 1 operates as follows.

When closed, the cutter-focus 9 of the vibratory feeder 8 fuel tablets 5 SDE formed the pillars of fuel pellets 5.

The cutter-clamp 10 the end of the column of fuel pellets 5 is pressed, but because of the varying height of the fuel pellets 5 column of fuel pellets 5 lodgement can be either equal to, or less than, or greater than the defined length of the column of fuel pellets 5. When closed, the cutter-clamp 10 and the open cutter-focus 9 pillars of fuel pellets 5 a.m in the open ends of the shells 7 and curb shell 7 is moved to the position of the length measurement of free volume between the open end of the filled shell 7 and the boundary of the column of fuel pellets 5 it using tube-meter 11.

The measurement is carried out either automatically or manually. When the automatic measurement automatic actuator 14, for example a pneumatic cylinder, tube-meter 11 is inserted into the open end of the filled shell 7 to the end with the column of fuel pellets 5, at the same time moves the movable unit 15 that interacts with the sensor 16 ways to give information about the length of the free volume and consequently the length of the column of fuel pellets 5. If the length of the column of fuel pellets 5 is equal to a specified filled shell 7 of the fuel element 1 is directed to the operation of pressing the retaining clips (not shown), when dlsa on donnaregina, and if the length of the column of fuel pellets is greater than the specified triggers automatic actuator 13, such as a pneumatic cylinder, and a rod-puller 12 its tapered end is inserted into the hole 6 fuel tablets 5, retrieves it from the curb shell 7, and touching fuel pellets 5 on the tube end-meter during the reverse stroke of the stripper 12 fuel tablet 5 is removed from the tapered end of the rod-puller 12.

When manual measurement tube-meter 11 is driven by a manual actuator 18, and the measurement result is determined by the size of division 19 of the tube-meter. Removing the fuel pellets 5 of the filled shell 7 is done manually by the actuator 17 and the rod-puller 12, spring-loaded in the cavity of the actuator 18. After extraction, the fuel pellets 7 manual actuator 17 under the action of the spring is returned together with the rod-puller 12 to its original position, and the fuel tablet 5 by the end of the tube, a measuring instrument 11 is removed from the tapered end of the rod-puller 12. The cone angle of the end face of the selected optimal, and any deviation in a direction more or less will reduce the efficiency of the device.

Claims

1. Device equipment automatic line izgotovlenie pillars of fuel pellets with a Central hole, communicated with one side open ends of the shells, and on the other with vibratory feeder single-piece feed of fuel pellets on said cradles, provided with a cutter-emphasis of the beginning of the post and the cutter-clamp the end of the column of fuel pellets, characterized in that the device equipment fuel elements automatic line is further provided with a gauge length of free volume between the open end of the filled shell and a border of a column of fuel pellets in it and combined with it the puller fuel pellets of the column of fuel pellets through the open end of the filled shell, made as movable in the axial direction with the possibility of entering into an open end of the filled shell tube-meter length, free volume from the open end of the filled shell to the border of the column of fuel pellets, inside of which is placed coaxially movable rod-puller with a conical end that communicates with the Central aperture walls of the fuel pellet during its extraction from the column of fuel pellets.

2. The device under item 1, characterized in that the tapered end of the rod puller is made with an angle of 4-5.

 

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FIELD: monitoring safety characteristics and variables of nuclear power units at nuclear power stations.

SUBSTANCE: proposed method that can be used, for instance, to adjust reactimeters of nuclear power stations with type RBMK-1000 and incorporates provision for reducing systematic measurement error by two orders of magnitude includes introduction of sets of variables characterizing correlation between fissionable elements of fuel and desired burn-up step in charge-coupled device module of reactimeter; determination of current value of mean fuel burn-up using data of centralized checkup system of reactor unit; and selection of respective mentioned variables by varying position of switch on rear panel of reactimeter. Use is made of sets of variables αi (fractions of i group delayed neutrons in delayed neutron generation responsible for total composition of fissionable isotopes of desired burn-up fuel) and sets of variables λeff (effective constants of i group delayed neutrons). Reactimeter adjustment scale is calibrated in terms of mean fuel burn-up in reactor core.

EFFECT: enhanced measurement accuracy, and nuclear safety, facilitated adjustment to current state of reactor by composition of fissionable elements of fuel.

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