Machine for building fuel assemblies from fuel elements

FIELD: machine-assembly equipment for producing nuclear reactor fuel assemblies.

SUBSTANCE: proposed machine has pneumatic cylinder rod provided with its motion limiter and contactless sensor at drifting mechanism on through slit of bottom end part of fuel element; cone angle of drift-rod is 30 deg. and annular drilling diameter in each hole of auxiliary spacer grid equals nominal flare of fuel element end part sections internally drifted inside each annular drilling within upper nominal-size tolerance D = Hk, where D is annular drilling diameter; H is nominal flare; k is upper nominal-size tolerance.

EFFECT: enhanced quality of fuel assembly.

1 cl, 5 dwg

 

The invention relates to the field of Assembly production, in particular to machines for the Assembly of fuel elements (Fe) in the fuel Assembly (FA), mainly for power reactors of VVER type.

A known machine for the Assembly of fuel Rods in the fuel assemblies, containing mounted on the frame, the drive of the fuel Rods in the form of inclined rails with a cut off piece feed mechanism of the axial movement of the fuel Rods in the form of a roller conveyor with clamping rollers, the cage with the skeleton under the spacer grid with mechanisms for moving the cage to the frame in horizontal and vertical direction, the pressing mechanism of the fuel Rods in the spacer grid in the form of a plunger-actuator in the form of a chain transmission mechanism equip Rods removable tips of conical shape with a diameter greater than the diameter of a fuel rod and control system (SU, ed. certificate No. 1186452, 23 P 15/26, 1985).

This machine provides a rigid geometrical dimensions of the collected fuel assemblies, which allows its transportation without self-destruction, but the complexity of manufacturing such a fuel Assembly is quite high, since after Assembly of the fuel Rods in the fuel assemblies is required to Orient each fuel rod in the fuel Assembly so that the holes in their lower end parts match, pass through the holes in the wire and fasten each TVEL manual welding wire to the bottom to zeway details under the lower grille. These works are amenable to mechanization and handled manually, which reduces the performance of the Assembly, assemblies, and molded design makes it impossible to replace one or more damaged fuel Rods in the conditions of a nuclear power plant.

A known machine for the Assembly of fuel elements in the fuel Assembly (see Russian Federation Patent RU №2099167, MKI 23 P 15/26, 21 D 53/08, 1995, publ. 20.12.97 year).

Machine for assembling a fuel rod in a fuel Assembly having a through slot on the end face of the lower end part containing mounted on the frame carrier TVEL in the form of rails with a cut off piece feed mechanism of the axial movement of the fuel elements in the form of a roller conveyor with clamping rollers, the cage with the skeleton under the spacer and lower grilles, a mechanism for moving the holder with the frame in the horizontal and vertical directions, mechanism for pressing the fuel rod in the spacer grid in the form of a plunger-actuator in the form of a chain drive, the die plate for lubrication, drive lugs, technological grid installed on the holder opposite to the pressing mechanism and holes aligned with the holes on the bottom of the lattice, the mechanism of burnishing and control system.

In the machine according to patent RU 2099167 provided Razdolnoe lower end parts for the lower grate on you is ananym the slots in the lower end part through the holes technological lattice cone mandrels using force pulling the fuel rod in parallel mounted the spacer grid, however, the pressing force should be strictly regulated and not to exceed a specified value, as TVEL has almost zero axial stiffness and excessive use of force pressing can lead to curvature of a fuel rod and marriage FA, and the application of effort is less than the specified value to Nadezhdinsky of a fuel rod in the spacer grid. It is possible that given enough effort only for pulling the fuel rod in the spacer grid and a lower grid and not enough to Razdolnoe the lower end part of the slot on the end of lower end items, especially when going to the fuel Rods in fuel assemblies with a deviation in diameter in a big way.

The closest to the technical conditions and the achieved effect is a machine for assembling a fuel rod having a through slot on the end of lower end parts in assemblies, containing mounted on the frame carrier Rods in the form of rails with a cut off piece feed mechanism of the axial movement of the fuel elements in the form of a roller conveyor with clamping rollers, the cage with the skeleton under the spacer and the lower grille, the mechanism for moving the holder with the frame in the horizontal and vertical directions, mechanism for pressing the fuel rod in the spacer grid in the form of a plunger-actuator in the form of a chain drive, the die plate for lubrication, drive lugs, technological grid installed on the holder from the side, opposite to the pressing mechanism and is made with holes aligned with the holes on the bottom of the lattice, the mechanism of burnishing and control system, where the mechanism of burnishing is equipped with a locking device mounted on the frame and is made in the form of a pneumatic cylinder with a conic rod in the form of a mandrel placed coaxially to the plunger Rods and interlocked with the control system of the machine, each hole of technological lattice length through the slots of the cylindrical part of the end face of a lower end part of a fuel rod is made annular groove with a diameter of approximately 1.5 times the diameter of the cylindrical part of the end face of a lower end part, and technological bars on the cage installed with the possibility of axial displacement and fixing in position locking device.

Another difference is that the locking device is designed as a hinge-attached to the yoke lever (see Russian Federation Patent RU 2177394, MPK7 23 P 15/26, 19/00 from 30.11.1999,, publ. 27.12.2001, “a Machine for the Assembly of fuel elements in the fuel Assembly”).

Implementation of the proposed Razdolnoe lower end parts by means of pneumatic cylinders will increase productivity and decrease labor costs.

However, in the process of Razdolnoe tapered mandrel rod of the pneumatic cylinder through the slots of the cylindrical part of the lower end concavo the details of fuel elements is possible niedogodnosci and Peregonovka. In the first case, the collapse of the through slots will not provide reliable fastening diluted with parts of the lower end part of the fuel element at the bottom of the lattice and it is possible that under the action of the upward flow of coolant in a nuclear reactor fuel element in the fuel Assembly can be shifted upward. In the second case perelomova on the cross-slots of the cylindrical part of the end face of a lower end part of the fuel element can lead either to cut off the dissolved parts of the lower end parts in places touch walls with square corners holes in the bottom grid, or to education in places touch the dissolved parts of the stress concentrators. Given that the lower end parts are made of Zirconia, the Zirconia is prone to corrosive corrosion, resulting from the abrasion of metal between the contact surfaces under the influence of fluctuation that occurs in a nuclear reactor (see, metallurgy of zirconium. Translation from English, edited by Gasperson and Uwharries. Publishing house of foreign literature. M., 1959, str).

All this can lead to incorrect mounting of the lower end part of the fuel element in the lower lattice fuel Assembly and it is also possible that under the action of the upward photocatalysis in a nuclear reactor fuel element in the fuel Assembly can be shifted upward. The offset of the fuel element can destroy adjacent fuel elements for mechanical on them exposed in the upward flow of the coolant of a nuclear reactor and pitting corrosion.

In the technical solution according to the patent 2177394 not specified cone angle of the mandrel, which is especially important because small angle will niedogodnosci is insufficient to collapse, and a large angle to perelomova, i.e. to the consequences described above. In the prototype annular grooves in each hole technological lattice approximately 1.5 times the diameter of the cylindrical part of the end face of the lower end parts are not representative and should be clarified, since the annular grooves should limit the collapse in the slots of the dissolved parts of the lower end parts and to prevent peredonov, i.e. to provide the upper limit of the field tolerance of collapse.

An object of the invention is to improve the quality of Assembly of the fuel Assembly.

This technical problem is solved by the fact that in the machine for the Assembly of fuel elements having a through slot on the end of lower end parts in the fuel Assembly containing the clip from the frame under the spacer and the lower grille, the mechanism for moving the holder with the frame in the horizontal and vertical directions, mechanism for pressing the fuel elements in the ran is neraudia lattice, the die plate for lubrication, technological grid installed on the holder opposite to the pressing mechanism, and is made with holes aligned with the holes on the bottom of the lattice, the mechanism of burnishing, made in the form of a pneumatic cylinder with a conic rod in the form of a mandrel placed coaxially to the plunger of the fuel elements and interlocked with the control system of the machine, each hole of technological lattice length through the slots of the cylindrical part of the end face of a lower end part of the fuel element is made annular groove, and technological bars on the cage installed with the possibility of axial displacement and fixing in position locking device.

According to the invention in the mechanism of burnishing on the cross-slotted end of the lower end part of the fuel element rod of the pneumatic cylinder provided with a limiter of its progress and proximity sensor, warning peredonov end part end part of the fuel element, the cone of the piston, a mandrel made an angle of 30°hazard peredonov end of the lower end part of the fuel element through the slot, and the diameter “D” of the annular grooves in each hole technological lattice is made equal to the nominal size “H” of the magnitude of the collapse razdosadovannyj nutricide annular groove parts, the end parts of the fuel element, limiting dornescu parts, the end parts of the fuel element within the upper limit of the field of tolerance on the nominal size D=Hkwhere

D - diameter of annular grooves,

N is the nominal size of the magnitude of the collapse,

it is the upper limit of the field of tolerance on the nominal size.

The proposed solution so as to limit the motion of the pneumatic cylinder, the use of the limiter and proximity sensors, warning peredonov end part of the fuel element, the execution of the cone piston, a mandrel equal to 30°, the warning nedomolvku end of the lower end part of the fuel element, and execution of the diameter of the ring grooves in each hole technological lattice, allowing to limit dornescu parts, the end parts of the fuel element within the field of tolerance, will allow to solve the technical problem.

The drawings show a machine for assembling a fuel rod in a fuel Assembly, in which figure 1 shows a machine for assembling a fuel rod in the fuel Assembly; figure 2 - mechanism of burnishing; figure 3 - locking device; figure 4 is a mechanism of burnishing with a sensor; figure 5 - stock-Dorn; figure 6 - the time of burnishing.

Machine for assembling a fuel rod in a fuel Assembly contains mounted on the frame 1 carrier 2 Rods 3 with a through slot at the end of the lower end part in the form of rails with adequately single-piece feed, mechanism 5 axial movement of the fuel element 3 in the form of a roller with a pressure roller holder 6 with the frame under the spacer grid 7 and the lower bars 8, the mechanism for moving the holder 6 with the frame 9 in the horizontal and 10 vertical directions, the mechanism 11 by press-fitting the fuel rod 3 in the spacer grid 7 in the form of a plunger actuator 12 in the form of a chain drive, the die plate 13 for applying lubrication, technological bars 14 mounted on a holder on the side opposite to the pressing mechanism 11 and is made with holes 15, coaxial with the holes 16 of the lower grating 8, the mechanism 17 of burnishing and control system (not shown).

The mechanism 17 of burnishing mounted on the frame 1, made in the form of a pneumatic cylinder with piston rod 18 with a cone on the end in the form of a mandrel with an angle of 30°placed coaxially to the plunger 11 and interlocked with the control system of the machine, each hole 15 technological grating 14 on the end-to-end length of the slot 19 of the cylindrical part 20 of the lower end of the end part 21 of a fuel rod 3 is made annular groove 22, and technological grating 14 on the holder installed with the possibility of axial displacement and fixing in position locking device 23 in the form of pivoted to the yoke lever. The mechanism 17 of burnishing in the form of a pneumatic cylinder through the slots 19 of the cylindrical part 20 of the lower end of the end part 21 Teplov the decisive element 3, the rod 18 of the cylinder provided with a limiter 24 of its progress and proximity sensor 25, warning peredonov the end part 20 of the end part 21 of the fuel element 3. The diameter “D” of the annular groove 22 in each hole 15 technological grating 14 is made equal to the nominal size “H” of the magnitude of the collapse razdosadovannyj within each annular groove 22 of the parts 20 of the end part 21 of the fuel element 3 limiting dornescu parts 20 of the end part 21 of the fuel element 3 within the upper limit of the “to” field tolerance on nominal size D=Nto.

Machine for assembling a fuel rod in a fuel Assembly works as follows:

The fuel rods 3 of the carrier 2 by means of the selectors 4 piece serves on the mechanism 5 axial movement of the fuel rod where the drive of the pusher 11 of the pressing mechanism driven by the actuator 12 through the die plate 13 is coated with a lubricant (water-glycerol solution) FE 3 zapressovyvajutsja into the cells of the spacer grids 1, the holes 16 of the lower grating 8 and the depth of the through slot 19 of the lower end part 21 in an annular groove 22 holes 15 technological grating 14, secured in the holder against the bottom bars 8 with the locking device 23. Simultaneously mechanism 17 of burnishing. Fixed to the frame 1, and the rod 18 of the cylindrical end 20 of the lower end parts 21 through the slots 19 rastorgovyvalsja in kolicevo the groove 22. Then for a given program ferrule shifts to step up or down vertically through the mechanism 10 is moved vertically or horizontally one step to the left or to the right using of the mechanism 9. Technological cycle continues until all Assembly FA, then opens the locking device 23, technological grid 14 from the bottom grating 8 axial shifting distance, providing work for removal of the collected beam TVEL to install the head and shank. Due to the cone angle of 30° on the torus rod 18, the limiter 24, the non-contact sensor 25 and D=Hkachieved the solution of the technical problem.

Machine for the Assembly of fuel elements in the fuel assemblies, containing the clip from the frame under the spacer and the lower grille, the mechanism for moving the holder with the frame in the horizontal and vertical directions, mechanism for pressing the fuel elements in the spacer grid, the die plate for lubrication, technological grid installed on the holder opposite to the pressing mechanism, and is made with holes aligned with the holes on the bottom of the lattice, the mechanism of burnishing, made in the form of a pneumatic cylinder with a conic rod in the form of a mandrel placed coaxially to the plunger of the fuel elements and interlocked with the system control the population of the machine, each hole technological lattice length through the slots of the cylindrical part of the end face of a lower end part of the fuel element is made annular groove, and technological bars on the cage installed with the possibility of axial displacement and fixing in position locking device, characterized in that the mechanism of burnishing on the cross-slotted end of the lower end part of the fuel element rod of the pneumatic cylinder provided with a limiter of its progress and proximity sensor, warning peredonov end part end part of the fuel element, the cone of the piston, a mandrel made an angle of 30°, the warning nedomolvku end of the lower end part of the fuel element through the slot, and the diameter of the ring grooves each hole technological lattice is made equal to the nominal size of the magnitude of the collapse razdosadovannyj within each annular groove parts, the end parts of the fuel element, limiting dornescu parts, the end parts of the fuel element within the upper tolerance on the nominal size D=Ntowhere D is the diameter of the ring grooves, N is the nominal size of the magnitude of the collapse, the upper limit of the field of tolerance on the nominal size.



 

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SUBSTANCE: proposed method is used for manufacturing fuel assemblies for type VVER-1000 and VVER-440 reactors. In order to check spacer grid for passability it is placed in machine between two covers with depressions that follow grid outline and blind holes coaxial to each subchannel of grid accommodating calibrated balls, then it is tuned together with covers through 180 deg., subchannels of inadequate caliber are detected and burnished by means of drift. For checking diameter of circumference inscribed in subchannel the grid is placed in machine equipped with large-diameter calibrating balls, subchannels through which these balls have passed are detected and squeezed by means of clamping tool with jaws disposed in holes between subchannels. Decision on quality of spacer grid subchannels is taken by sticking of balls in them as spacer grid is turned in machine through 180 deg. Balls of different diameters are differently colored.

EFFECT: enhanced quality and yield of spacer grids.

2 cl, 4 dwg

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EFFECT: higher efficiency.

4 cl, 1 dwg

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