Device for horizontal equipment fuel claddings tablets
(57) Abstract:Usage: the invention relates to nuclear engineering and can be used in the gear casings fuel elements (cartridges) of nuclear fuel (tablets). The device contains a vibrooccasion made in the form of the profile of the Cam driven in rotational motion from the drive. The Cam acts on the movable element made in the form of a rod, mounted on it with a shell of a fuel rod. The rod acts through the hinge to the bowl set can be rotated. 6 Il. The invention relates to nuclear engineering and can be used in the gear casings fuel elements (cartridges) of fuel tablets.A device for input of radioactive pellets in the tube capacity  the Device comprises a docking station with channels for input shell and tablets and the clamping sleeve to ensure the immobility of the login shell.A disadvantage of this device is the low productivity, the possibility of jamming of the pills in the shell at their introduction, no paliatsos, which also increases the probability of jamming and leads to the necessity of introduction is cast pellets in the fuel rods of the rod type  includes a table for placing the pellets in the fuel rods, fixed in the upper part of the table and located coaxially with the tablets, and the vibrating device is connected with the table for the transmission of vibrations, and the vibrating device is connected with the table for the transmission of vibrations in such a way that, when the device vibrates, the table can vary, making the movement forward, up, back and down, forcing them to move every tablet in the fuel rod rod type length, a predetermined time of each cycle.The device provides high performance equipment fuel rods. A disadvantage of this device is its high energy consumption associated with the presence of a powerful vibrator and a large number of structures. This is due to the need to ensure the rigidity of the table not only in longitudinal but also in the transverse direction.The closest in technical essence and the achieved technical result is a device for loading nuclear fuel tablets  (prototype). The device includes a base, a supporting frame, on which is mounted a plate having multiple grooves, which are fuel pellets. Against the frame has a movable table provided with a vibration to the horizontal. Between the ends of the plate and table installed a transitional device that provides input tablets in the shell. The device is equipped with a movable block levers are equipped with an electric actuator for axial movement. The device is equipped with a system of control over the content.When enabled, the drive unit moves levers and moves with gutters plate fuel pellets through a transitional device in the shell starts vibrooccasion, the table provides inclined reciprocating movement, tablets are moving in the shell and fill them completely. Slope location table contributes to this.The specified device has the following disadvantages: a significant number of manual operations, namely: installation shells and posting them on the table, inserting transition bushings in a transitional device, placing the tablets in the grooves on the plate. One of the major drawbacks is the high energy and intensity, complexity and structure.The invention is directed to a solution to reduce energy and metal consumption, simplifying the design and improving the operational characteristics of the device for equipment fuel rods.The task releasename it vibrooccasion, the vibratory feeder Cup with pills and a connecting element, the vibrooccasion made in the form of a Cam mechanism, a spring-loaded plunger which has the ability to interact with a bar attached to it by the shell and the rod, in turn, can impact tangentially through the hinge attached to the axis of the bowl with tablets, while the plunger and the rod with the shell have the opportunity to go forward and bowl angular synchronous and in-phase oscillatory movement, and the Cam mechanism is made to the law of movement of the plunger in all phases of motion, satisfying the following mathematical expression:
S 0,5 gKt2,
where S is the displacement of the pusher, m;
g the acceleration of gravity, m/s2;
K > Ktfor phase forward;
K < Ktfor phase reverse;
Ktthe coefficient of friction between the tablet and the shell material;
t the current time phase of the movement of the pusher, C.In comparison with the known analogues, including the prototype, the use of vibrooccasion in the form of a Cam mechanism, a spring-loaded plunger which cooperates with the rod only in the axial direction, does not require a reinforced aswesome rigidity in the longitudinal direction. During performance of the process equipment of the fuel rods is easily adjustable by varying the speed of rotation of the engine.The task of the different accelerations of the pusher vibrooccasion (see distinctive features in the claims) in the phases of movement forward and back creates the conditions for the movement of pellets in the shell.Synchronous and in-phase axial oscillatory movement of the rod and fixed thereto shell provide pills easy sliding tray Cup, docking shell element with the bowl and the inside of the shell. At the same time excluded the impact of the ends of tablets and reduced likelihood of damage to the tablets.In Fig. 1 shows a device for equipment rods, front view, Fig. 2 a top view; Fig. 3 type a and B of the fastening rod, the roller follower and the Cam; Fig. 4 section B-b shows the bracket attached to the rod, and the location of the rod in the sliding guides of Fig. 5 type G for the connecting element of Fig. 6 type D, a top view of the Cup and the connecting element in place of the output of the tablets from the bowl.The device contains a vibrooccasion made in the form of a Cam mechanism and consisting of a profile of the Cam 1, mounted on the shaft podlasia 6 and communicates with the above-mentioned Cam 1. On the rod 7 is fixed through a bracket 8 shell 9. One end of a rod rigidly fastened to the pusher and the other end has the opportunity to interact tangentially through the hinge 10 is fixed on the axis of the bowl 11. The rod 7 is installed in the guide 12 with the possibility of lateral movement. The Cup 11 is provided with a guide part 13. On the rod 7 has a connecting element 14, made in the form of connecting lodgement between the part 13 and the adapter 15. as the gear casings tablets is a dusty operation, the bowl 11, the connecting element 14 with the adapter 15 and the open end snaryazhenii shell 9 is placed in a sealed glove box 16. The entire device is mounted on the stationary frame 17.The device operates as follows.Sealed on the one hand, the membrane 9 of the transport mechanism 18 is fed to the support arms 8, and then the open end of the shell is inserted in the adapter 15 and secured.When the shaft of the actuator 3, the profile of the Cam 1, performing a rotational movement acts on the roller 5 of the pusher 4, and the rod 7 mounted on it with a shell 9 is moved in the axial direction, while the chief is Angi 7 with the shell 9 and the bowl 11 to its original position by a spring leaf springs 6. Thus, the rod 7 with the shell 9 performs translational and bowl 11 angular synchronous and in-phase oscillatory motion, forcing tablets 19 lying on the bottom of the bowl 11, to move (slide) on the tray bowl and leaving through the part 13, then through the connecting element 14 and the adapter 15 to the shell 9. Single vibrancy formed by the tray bowl 11, the connecting element 14, the adapter 15 and the shell 9, provides unobstructed smooth sliding of the tablets 18 without collisions and congestion, excluding chips and other damage.Test devices showed that simplicity, reliability, small metal and energy intensity, adjustable speed electric drive provide improved operational characteristics of the rig rods and performance and allows us to assert that the present invention is useful, necessary.The sources of information.1. Device for introducing radioactive pellets in a tubular container. French patent N 2522436, CL G 21 C 21/02, 1983.2. A device for loading fuel pellets in the fuel elements of the rod type. Application France N 2257130, CL G 21 C 21/02, 1975.3. The device for loading the pellets of nuclear fuel rods pills, containing a frame placed on it vibrooccasion with a movable element, a vibratory feeder with pills and a connecting element, wherein the vibrooccasion made in the form of a Cam mechanism that is installed with the possibility of interaction with a movable element made in the form of a rod mounted on it with a shell of a fuel rod, and the rod is installed with the possibility of interaction through the hinge with the feeder, made in the form of a bowl that is installed with the possibility of rotation.
FIELD: atomic power engineering.
SUBSTANCE: device 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.
EFFECT: higher efficiency.
4 cl, 1 dwg
FIELD: nuclear power engineering; manufacture of fuel elements and their claddings.
SUBSTANCE: each 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.
EFFECT: enhanced quality of fuel elements and their operating reliability in reactor core.
1 cl, 1 dwg
FIELD: power engineering, namely nuclear power reactors, particularly sealing of fuel elements by means of contact butt welding with use of plugs.
SUBSTANCE: apparatus 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.
EFFECT: enhanced stability of process, improved quality of welded joint due to lowered misalignment of tube and plug.
FIELD: nuclear power engineering; manufacture of fuel elements for fuel assemblies of nuclear power reactors.
SUBSTANCE: proposed 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.
EFFECT: enlarged functional capabilities of process line for manufacturing fuel-element cans of different sizes.
1 cl 7 dwg
FIELD: mechanical engineering.
SUBSTANCE: 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.
EFFECT: enhanced quality of welds and reliability of fuel element sealing.
FIELD: nuclear power engineering; tubular dispersed-core three-layer fuel elements.
SUBSTANCE: 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.
EFFECT: enhanced stability of active layer and can thickness in shaping polyhedral fuel elements.
1 cl, 4 dwg
FIELD: nuclear power engineering.
SUBSTANCE: proposed 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.
EFFECT: enhanced reliability of fixing fuel element plugs in bottom grid holes of separable and nonseparable fuel assemblies, reduced labor consumption for manufacture and assembly.
1 cl, 3 dwg
FIELD: nuclear power engineering; manufacture of fuel elements for fuel assemblies of power reactors.
SUBSTANCE: proposed 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.
EFFECT: enhanced quality of fuel element manufacture.
3 cl, 3 dwg
FIELD: nuclear power engineering, possibly automatic line for producing fuel elements of fuel assemblies of power nuclear reactors.
SUBSTANCE: aggregate is provided with detachable device for measuring electric resistance of fitting. Said device is arranged between collet chucks being in open position and it is made of two dielectric members spring-loaded one relative to other. End of one of said members has shape corresponding to contour of annular turning formed coaxially on end of collet chuck for plug. End of second member has shape corresponding to contour of annular turning formed coaxially on end of fitting in collet chuck for fuel element envelope. Said device has spring-loaded contacts for measuring electric resistance between fitting inside collet chuck and collet chuck itself. Caprolactam is used as dielectric material.
EFFECT: enhanced efficiency and quality of contact butt welding at sealing fuel element.
2 cl, 3 dwg
FIELD: nuclear power engineering.
SUBSTANCE: members used for fastening fuel element in hole of bottom end spacer grid are made in the form of shortened plug that has coaxial blind hole on its butt-end formed by annular walls expanded (burnished) in hole of larger diameter within bottom end spacer grid.
EFFECT: enhanced reliability of fuel assembly, reduced manufacturing cost and structural material input.
1 cl, 3 dwg