Method for manufacturing fuel elements
 Process line for fuel element manufacture / 2256250Process line primarily used for manufacturing fuel elements for VVER-1000 and VVER-440 reactors has charged can weighing device built integral with can-and-plug assembly weighing device that determines net weight of charged can by internal components, box holding devices for discharging fuel pellets from rejected fuel element, destructive testing of helium pressure within can, and preparing specimens for metallographic inspection. |
 Method for producing tubular three-layer fuel elements / 2248049Proposed method includes production of powder mixture, powder mixing in plasticizer environment, cold molding in core billet with plasticizer, thermal sintering, hot molding-calibration of fuel core, core placing in can made in the form of sleeve with annular slot, calibration, hot molding through die, and drawing; inner surface of external can of sleeve is provided with longitudinal bulges and outer surface bears bulge location marks; fuel core is provided with longitudinal flats and placed in sleeve taking care to align bulges of the latter with core flats; in the course of drawing marks are aligned on arbor ribs. |
 Fuel rod for water-moderated water-cooled power reactor / 2244347Proposed fuel rod designed for use in water-cooled water-moderated power reactors such as type VVER-1000 reactor has fuel core disposed in cylindrical can. Outer diameter of fuel rod is chosen between 7.00 . 10-3 and 8.79 . 10-3m and fuel core diameter is between 5.82 . 10-3 and 7.32 . 10-3m and mass, between 0.93 and 1.52 kg, fuel core to fuel rod length ratio being between 0.9145 and 0.9483. |
 Machine-tool for producing fuel assemblies from fuel elements / 2261492Fuel elements held in accumulating tank installed under machine-tool incorporatying two-coordinate positioner and linear drive with pusher provided with collet chuck are vertically inserted in parallel into fuel assembly frame. Distance between spacer grids is increased from 250 to 500 mm and more. |
 Method and installation for wet grinding of fuel pellets / 2261491Fuel pellets moving over vibration bar are irradiated by laser beams in relatively perpendicular direction and computer generates signal for isolating faulty pellet by blowing it off vibrating bar with compressed air jet, and grinder is adjusted in case pellet does not meet requirements to its size. In this way computerized procedures are used for measuring geometrical dimensions of all ground pellets, including their grading, and for grinder adjustment. Installation implementing this method is also described. |
 Method and process line for producing fuel-element component parts / 2261490Proposed method includes displacement of component parts (bottom plugs, top plug separately from retainers and the latter with aid of vibration transducer that imparts reciprocal motion to guides with net in-between; displacement of this net through waves in baths filled with degreasing and washing solutions and through drying chamber, waves in these baths being produced by means of pipes communicating with process line pumps. |
 Method and device for inspecting and grading fuel elements / 2261489Fuel element is detected by sensor on measurement position. In response to sensor signal it is clamped and held in position for local pulsed heating in compensating volume region. Temperature variations are recorded while fuel element is turned in beginning and end of its heating, and during turn intervals. Helium pressure and pressure measurement ranges are given in description of invention. Pressure measurement assembly of inspection device is built of four functional units incorporating pneumatic distributor, primary transducer, induction heating generator, as well as treatment and control module built around industrial computer. |
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Process line for fuel element manufacture / 2256250 Process line primarily used for manufacturing fuel elements for VVER-1000 and VVER-440 reactors has charged can weighing device built integral with can-and-plug assembly weighing device that determines net weight of charged can by internal components, box holding devices for discharging fuel pellets from rejected fuel element, destructive testing of helium pressure within can, and preparing specimens for metallographic inspection. |
 Method for manufacturing expanding chucks for resistance butt welding machine / 2256249Proposed method is used for manufacturing fuel elements of type VVER-1000 and VVER-440 reactors when sealing them in resistance butt welding machine using expanding chuck. Novelty is that spent chucks cleaned from uranium dioxide are used as charge to be melted for producing new ones of sufficient strength and flexibility. Spent chucks are melted at 1300 - 1350°C for 20 - 25 min., melt is degassed at pressure of 4.5 x 10-3 of mercury; when cleaning molten bronze from nonmetallic admixtures, the latter are upset on cooled crucible walls in the course of short-time disconnection and connection of inductor load; ingots obtained are hardened in water at 780 ±10°C and annealed at 320 - 340 °C for 3 - 3.5 h to make them flexible; then expanding chucks are manufactured by mechanical method. |
 Inspection and sorting-out line for fuel elements / 2256248Proposed line is provided with computer-aided system for contactless control of flaw depth and profile on surface of fuel element can and on end parts including sorting-out device that functions to reject faulty fuel elements. This line is characterized in high capacity and reduced labor consumption. |
 Method for manufacturing fuel assembly spacer grid and device for producing subchannel blanks for spacer grid / 2256244Spacer grid subchannels are produced from thin-wall tube by its chipless cutting into blanks with aid of rotary knife edges as they approach external and internal surfaces of revolving thin-wall tube; in the process operations of thin-wall tube division into blanks, chamfering opposing ends of blank, and burring them are combined. |
 Pelletized fuel manufacturing process / 2255386Proposed process includes introduction of aluminum and silicon oxides in molded powder which form alumosilicate as result of pellet sintering aiding in enlargement of uranium dioxide grain to 10 - 20 μm and in increasing hardness compensated for by plasticity. In this way promising pelletized fuel of enlarged grain size and desired creep rate is obtained. Fuel pellets are noted for improved performance characteristics with respect to after-sintering and for enhanced effectiveness of fuel cycle in nuclear reactor due to enhanced burn-up. |
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Mode of receiving fuel pellets for heat-generating elements out of uranium dioxide / 2253913 Mode of receiving fuel pellets for heat-generating elements out of uranium dioxide, including preparation of pressed powder out of uranium dioxide of ceramic variety, pressing and agglomeration of pellets. The pressed powder is received by way of decomposition of ill-conditioned sintered pellets in a mill with grinding bodies and adding 2-4 mass.% cellulating substance, and also out of uranium dioxide received according ADU-process, and out of uranium dioxide received by way of decomposition of ill-conditioned sintered pellets in a mill with grinding bodies and with adding 2-4 mass.% of cellulating substance. |
 Device for welding heat-emitting elements / 2243869Device has welding chambers having apertures for inputting covers for pressurization, which concurrently are output apertures of heat-conductive elements, welding chambers electrodes, power source, transporting module for transverse product feed, common control system with blocks for parallel and serial connection, device for forming a break in secondary contour. Welding chambers are placed in parallel to each other at distance from each other, determined from formula S=t(m k+1), where S - distance between chambers axes, t - step of transport module, k - number of chambers in device equal to number of steps of transporting module in each singular step thereof, m - any integer starting from one, and control systems connected through parallel connection block to working tools of device of same names, and through block for serial connection to welding force drive and to device for forming break in secondary contour of power source, as well as to power source connected in parallel to welding chambers electrodes. |
 Process line for manufacturing fuel element cladding / 2244356Each weld of cladding and its plug are tested in facility equipped with units for clamping and revolving the claddings, scanning with carriage using weld inspection piezoelectric transducer and piezoelectric transducer for measuring wall thickness in measurement region, immersion bath, ultrasonic pulse generator, ultrasonic pulse receiver, microprocessor, analog-to-digital converter switch, and random-access memory. |
 Apparatus for sealing tubular articles by means of contact butt welding / 2245769Apparatus includes sealed welding chamber with housing non-detachable at operation and having through duct for feeding parts to welding zone; mechanisms for sealing welding chamber; device for feeding parts to welding zone; additional clamp of tube; mechanisms for gripping and fixing welded parts; drive device for supplying welding pressure; autonomous drive units. Mechanisms for gripping and fixing welded parts are in the form of collet chucks with respective drives. Welding pressure supply drive device is connected with electrode holder of plug. Welding chamber is restricted by non-detachable housing and flange-current supply lead that is fluid -tightly connected with housing and fixed relative to housing at operation. One collet chuck has annular detachable current supply lead in the form of sectors and it rests by its end at side of large base of petal cone upon said flange-current supply lead. Collet chuck of tube grip and electrode-holder of plug have coaxial electrically insulated one relative to other tie rods arranged in through duct of chamber and joined with autonomous drive units. |
 Fuel element can process line / 2246770Proposed process line has mechanism for press-fitting bottom plug in calibrated end of can provided with cutoff gear for piece-by-piece feeding of bottom plugs of different types that incorporates bottom plug passage duct accommodating C-shaped member with reciprocating horizontal-motion actuator whose top flap has slot engageable with upper cylindrical part of bottom plug; bottom flap is longer than top one and is provided with bottom plug passage hole shifted toward edge of bottom flap; flaps are spaced apart through distance slightly longer than maximal length of thick end of bottom plug; rod designed for press-fitting bottom plug in calibrated end of can has bed with seat to receive bottom plug, maximal-size portion of seat following shape of bottom plug. |
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Fuel element manufacturing method / 2246771 Proposed method is intended for manufacturing fuel elements using resistance-butt welding primarily for their joining to zirconium alloy cans. Welding is effected at equipment electrical resistance not over 30-fold resistance of can section forming welded joint having or not point discontinuities in the form of separate spots or chain of such spots forming no continuous line and measuring maximum ten thicknesses of weld in cross-sectional area of welded joint under check disposed at distance equal to two or three thicknesses of can wall from butt-end of plug located inside fuel element, welded joint being checked by uniformity of external fin. Length of poor fin formation section does not exceed 10% of joint perimeter. |
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Method for producing tubular three-layer fuel elements / 2248049 Proposed method includes production of powder mixture, powder mixing in plasticizer environment, cold molding in core billet with plasticizer, thermal sintering, hot molding-calibration of fuel core, core placing in can made in the form of sleeve with annular slot, calibration, hot molding through die, and drawing; inner surface of external can of sleeve is provided with longitudinal bulges and outer surface bears bulge location marks; fuel core is provided with longitudinal flats and placed in sleeve taking care to align bulges of the latter with core flats; in the course of drawing marks are aligned on arbor ribs. |
 Nuclear reactor fuel assembly / 2248052Proposed fuel assembly primarily designed for use in nuclear power reactors VVER-1000 and VVER-440 has composite bottom spacer grid built of at least two parts identical with respect to disposition of holes and total thickness of component parts equal to height of circular collar on bottom plug of fuel element, and tubular channel hole diameter for bottom plugs equal to diameters of lower ends of bottom plugs; the latter are secured in holes of aligned parts of bottom spacer grid by shifting component parts of bottom spacer grid relative to each other, by locking bottom plugs on circular collar of bottom plugs between annular projections of upper and lower parts of bottom spacer grid, and by aligning flow holes of bottom spacer grid component parts. Component parts of bottom spacer grid are rigidly fixed upon their shifting to bottom nozzle of fuel assembly in case of nonseparable type of assembly and loosely attached upon their shifting to bottom nozzle in case of separable type of assembly. |
 Process line for manufacturing fuel elements / 2248054Proposed process line has mechanism for weighing can charged with fuel pellets installed past retainer press-fitting mechanism; can is coupled through computer with mentioned weighing mechanism for outputting data on pure mass of pellets in can; γ-quanta detecting units and pellet enrichment automatic control installations are mounted on charged can guiding facility in the form of rolling train between its rollers throughout length of charged pellet stack; detecting units are disposed around pellet stack charged in can with collimation channels shifted throughout length of charged pellet stack; detecting units are provided with photoelectronic multipliers, spectrometers, and data acquisition, processing and outputting computer. Each detecting unit is provided with through hole passing can-displacement tungsten tube; shifted collimation channels are provided in top and bottom parts of tungsten tube; photoelectronic multipliers are disposed on butt-ends of detecting unit. |
FIELD: nuclear engineering; manufacture of plate-type fuel elements.
SUBSTANCE: core for three-layer assembly that has sleeve, circular core, and plugs is provided with longitudinal bonds made of sleeve material and three-layer tube obtained upon joint hot extrusion and drawing is cut along bonds; segments obtained in the process are drawn through slit die.
EFFECT: reduced labor consumption due to reduced number of pre-heat rolling operations.
1 cl, 5 dwg
The invention relates to the field of nuclear technology, in particular to a method of manufacturing a plate fuel elements.
A known method of manufacturing a plate-type fuel elements (A.G. Samoilov and other "Dispersion Fuel elements", 1, "Energoizdat", M, 1982, str-198), including separate metal plates, shells, frames and core representing dispersed in a metal matrix ceramic nuclear fuel Assembly package with adjustment of the fuel plate size hole frame, multiple rolling with preheating in order to achieve the degree of deformation of at least 80% cold rolling.
The disadvantage of this method is the high complexity.
There is a method-prototype (A.G. Samoilov and other "Dispersion fuel elements", 1, "Energoizdat", M, 1982, str-204) manufacturing, including Assembly sintered billet core of a fuel rod with the sleeve of the jacket material, the joint is hot extruded three-layer pipe with deformation rate over 80%.
The disadvantage of this method lies in the high complexity of the manufacturing process.
The objective of the invention is to reduce the complexity of the manufacturing process plate fuel elements.
The problem is solved in that in the method of manufacturing a fuel element, including the production liner, core tubes, Assembly, joint hot extrusion and drawing, according to the formula of the invention, the core performs the ring with longitudinal ridges of the material of the liner and after hot extrusion and drawing three-layer pipe is cut jumpers, and the resulting segments are drawn through the slit matrix.
This set of features is a new, unknown in the prior art and solves the problem as the method allows for a single operation by the method of joint hot extrusion of a three-layer preform to produce a three-layer pipe, which contains several jumpers from the material of the sleeve. Longitudinal cutting of three-layer pipe in the middle of the jumper and the subsequent drawing of the received segments allows you to make multiple plate fuel elements of various configurations and sizes.
Figure 1 shows the longitudinal section of the sleeve 1 with the annular groove 2.
Figure 2 shows a end view of the cores 3 jumpers 4.
3 shows the end view of the three-layered preform of the liner 1, the core 3 and jumpers 4, the tube is conventionally not shown.
Figure 4 shows a cross-section of the plate segment of a fuel rod after cutting the pipe, consisting of a shell 5 formed of the sleeve 1 and jumpers 4, and the fuel is about core 3.
Figure 5 presents a cross section of a plate of a fuel rod, comprising a shell 5 and the fuel core 3.
The method is as follows.
Make the sleeve 1 aluminum alloy ring groove 2. Then make the fuel core 3, is divided into several parts, the ridges 4, made of a material liners. Set the core 3 with the notches 4 in the annular groove 2 of the sleeve 1 and the choke tube. Get a three-layer preform (figure 3). Then produce a three-layer heating of the workpiece and squeeze it on the press through the matrix. To eliminate taper three-layer pipe and receiving the required size of the wall thickness to perform the drawing of the three-layer pipe. Then produce a longitudinal cutting of the pipe in the middle of the crosspieces 4, resulting in the receive segments of plate Fuel elements (figure 4). Flat plate (figure 5) is made by drawing segments through the slit matrix.
Further, depending on the design of the fuel Assembly attach the plates to the desired cross-sectional shape on the press using a stamp.
An example of the method.
Aluminum alloy AMG make the sleeve and tube. Turning prepare a core consisting of two dispersive segments, separated from each other by longitudinal ridges from the lava AMG. Following the Assembly of the sleeve, core and tubes, get a triple-layered piece. To address gaps in the three-layer preform produce its calibration. Following heating of a three-layer preform together hot three-layer extrusion billet with deformation rate of 87%. Carry out the heat treatment of the obtained three-layer pipe. Then to eliminate taper pipe perform the drawing. Thus obtained three-layer pipe, the wall thickness of which corresponds to the upper value field tolerance wall thickness plate of a fuel rod. Label the middle of the jumpers and cut a three-layer pipe into two segments. After performing a heat treatment carried out editing semicircular segments to the state of the plate. This is followed by a heat treatment and perform the final drawing of a flat plate.
After performing the heat treatment for forming the stamp get the desired transverse profile of a fuel rod, in particular a part of a circle of radius R 140 mm
Thus, this method allows to reduce the complexity of manufacturing plate fuel elements by reducing the number of pochatok with preheating.
The method of manufacturing a fuel rod, comprising the manufacture of the sleeve with the annular groove, core, cork, their Assembly and joint hot issue is the Lebanon, characterized in that the core perform ring with longitudinal ridges made of a material cartridge, insert it into the annular groove of the sleeve and choke tube with the formation of a three-layer preform, which is then after hot extrusion and drawing cut along the axis in the middle of the jumper, causing the receive segments, which are then subjected to drawing through the slit matrix prior to the formation of flat plates.