Line washing and drying end fittings of the fuel element

 

The line is designed for use in the manufacture of fuel elements for nuclear reactors. The first of three adjacent baths lines are equipped with devices for heating, automatic control and regulation of the temperature of the degreasing solution and its level; mechanisms degreasing the first two tubs made in the form of magnetostrictive transducers and pump circulation unit, the suction nozzle through which the filter is communicated with the lower part, and the pressure introduced into the upper part of each of the adjacent baths; the mechanism of leaching of the third bath is made in the form of a circulating pump unit, the pump suction which is communicated with the lower part of the bath, and the discharge pipe with nozzles in the upper part; the drying chamber is adjacent to the third adjacent the tub and has a vertically movable gate valve; mechanism of drying is made in the form of a coil, and the transport - in the form of a net transport of the container. The invention provides improved performance and efficiency degreasing. 1 C.p. f-crystals, 5 Il.

The invention relates to nuclear energy and may find application in the manufacturing th is alausi element of a nuclear power reactor, containing envelope filled with gas of specific composition and pressure of the fuel pole held by the retainer, and the plugs on the ends connected to the shell welds made from one side of the electron-beam welding, and on the other hand - contact butt welding (see Russian Federation patent RU 2127457 on the application 97109458/25 from 04.06.97, publ. 10.03.99, IPC 6 G 21 C 3/10, 21/00, 21/02, 23 TO 11/02, 15/00). End part of TVEL - bottom, top caps and tabs are in the process of their manufacture contaminated lubrication and sealing of a fuel rod can not be used.

It is known that electron-beam welding of the main defects in welded joints of low-alloy zirconium alloys are pores and root swellings. Sources are gases, moisture, products of sublimation in microvolumes at the root of the seams. When the temperature of the lubricant on the surface of the terminal fittings (plugs) these products are expanding, moving into vapor and gaseous products of sublimation, thereby creating increased pressure in the possible nucleation sites then. In this regard, the problem of porosity in electron beam welding is very serious (see Development, production and operation of fuel cells energy of reaction is Alenia metal shell and plugs are completely eliminated the defects of metallurgical origin: pores, cracks (see ibid, page 218), but getting into the welding zone lubricants dramatically affects the connection stub with a shell that can lead to the final fatal marriage.

Closest to the technical essence and the achieved effect is a line of washing and drying, containing ensuite bath degreasing, rinsing and drying chamber with the mechanisms of degreasing, rinsing, drying and transportation (see Russian Federation patent RU 2145449, IPC 7 G 21 C 21/02 on the application 97118139/06 from 30.10.1977, publ. 10.02.2000. The automatic production line of fuel elements, Fig.5, 6). The automatic production line of fuel elements is composed of a line of washing and drying in the form of adjacent baths, degreasing, rinsing and drying chamber lengthy membranes for fuel rods. Design mechanisms degreasing, rinsing, and drying involves moving each tub long-length fuel rod claddings them by dipping in a degreasing solution, the cleaning solution, moving the camera during drying and moving from the bath into the tub, however, the design of these mechanisms does not allow for degreasing, washing and drying of the end fittings of the fuel elements in the form of plugs and retainers because of their small ku and drying of end fittings for fuel rods with sufficient performance and efficiency degreasing, the issue of providing fuel elements without reducing the rhythm of their issue and of high quality. This technical problem is solved by the fact that in line washing and drying end pieces in the form of plugs and retainers fuel element containing ensuite bath degreasing, rinsing and drying chamber with the mechanisms of degreasing, rinsing, drying and transportation, according to the invention the first two ensuite baths are equipped with devices for heating degreasing solution, automatic control and regulation of the temperature of the degreasing solution and its level mechanisms degreasing the first two ensuite baths are made in the form of two magnetostrictive transducers embedded in the bottom of each of the adjacent baths, communicated with a supply of magnetostrictive transducers and circulation pump Assembly, the suction nozzle through which the filter is communicated with the lower part of each adjacent bath, and the discharge pipe is introduced into the upper part of each of the adjacent baths, the mechanism of leaching of the third adjacent tubs made in the form of a circulating pump unit, the pump suction which is communicated with the lower part of the third connecting baths, and pressure pipe with nozzles in the upper part to the mi butterfly where the mechanism of drying is made in the form of a heater with recirculation wiring ducts with flow in the lower part and the output from the upper part of the drying chamber, and the transport is made in the form of net transport container is transported from the bath into the tub, and a conveyor to move through the drying chamber and / or cooling and unloading.

The other difference is that

as the device is heated degreasing solution used tubular paralarval, built-in tub;

the execution of the line washing and drying end pieces of the fuel rods will allow for efficient and productive to clean the surface of the end fittings-plugs and retainers without reducing the rhythm of production of fuel elements.

The drawings show a line of washing and drying of end parts of a fuel rod, in which Fig.1 - line (side view), and Fig.2 - line (top view), and Fig.3 - ensuite bath degreasing; Fig.4 - adjacent washing bath; Fig.5 - drying chamber.

Line washing and drying end pieces in the form of plugs and retainers of a fuel rod contains ensuite baths 1, 2 fat, 3 bath rinsing, the drying chamber 4 with the mechanisms of degreasing, rinsing, drying and transportation. The first two ensuite baths 1, 2 sleep is for the temperature of the degreasing solution and sensors 7. Mechanisms degreasing the first two ensuite baths 1, 2 is made in the form of two magnetostrictive transducers 8, built into the bottom of each of the adjacent baths 1, 2, communicates with the power source 9 magnetostrictive transducers 8 and circulating pump unit 10, the suction nozzle 11 through which the strainer 12 is communicated with the lower part of each adjacent baths 1, 2, and the discharge pipe 13 is introduced into the upper part of each of the adjacent baths 1, 2. The mechanism of leaching third ensuite bath 3 is made in the form of a circulating pump unit 14, the suction nozzle 15 which is communicated with the lower part of the third ensuite bath 3, and the discharge pipe 16, the nozzles 17 in its upper part. The drying chamber 4 is made adjacent to the third ensuite bath with 3 vertically movable up and down sliding dampers 18, 19, where the mechanism of drying is made in the form of coil 20 with recirculation wiring ducts 11 filing in the lower part and the output 22 of the upper part of the drying chamber. The transport is made in the form of a net transport of the container 23 to be transported from the bath into the tub, and conveyor 24 to move through the drying chamber. The line is equipped with table 25 download mesh container 23 and article which I operates as follows. End parts for the fuel rods in the form of plugs, lower, upper plugs or clamps on the table of the boot 25 is placed in a wire mesh container 23 and is transported into the tub 1 degreasing detergent solution MC-8 or MC-6, where degreasing is carried out at a solution temperature of 75-85With the insertion device 5 is heated in the form of paranirvana with automatic control and regulation of the temperature sensor 6 degreasing solution, the sensor 7 levels, magnetostrictive transducers 8 from the power source 9 magnetostrictive transducers and circulation pump Assembly 10. Integrated performance of these devices, the cleaning solution through the suction nozzle 11, the strainer 12 enters the circulation pump unit 10 and the pressure tube 13 is returned to the upper part of the bath 1. Mesh container 23 from the bath 1 is supplied into the tub 2, where rinse in purified potable water at 65-75By analogy with the first bath. Mesh container 23 is moved into the tub 3, where the final rinse is carried out in distilled water at 20-25 ░ C with the inclusion of the flushing mechanism in the form of a pump circulating aggregatumok 16 is returned to the nozzle 17 3 baths and jet washes end components are in mesh container 23. After jet washing mesh container 23 is mounted on the conveyor 24, opens gate valve 18 and the mesh container 23 by the conveyor 24 is transported to the drying chamber 4, the gate valve 18 is closed. In the drying chamber 4, the drying is performed with purified air at a temperature of 80-100°C from the heater 20 with recirculation wiring duct 21 with the feed in the lower part and the output 22 of the upper part of the drying chamber 4. After drying mesh container 23 by the conveyor 24 is withdrawn from the drying chamber of the 4 open the gate valve 19 and comes to the table 26 cooling and unloading under the exhaust pipe 27 of the ventilation system.

The rhythm of the net issuance of containers 10 minutes

The line capacity is 12000 PCs/shift.

The line has been tested and provides the performance of a technical problem.

Claims

1. Line washing and drying end pieces in the form of plugs and retainers fuel element containing ensuite bath degreasing, rinsing and drying chamber with the mechanisms of degreasing, rinsing, drying and transportation, characterized in that the first two baths are equipped with devices for heating obezzhirivayuschego degreasing the first two ensuite baths are made in the form of two magnetostrictive transducers, built into the bottom of each of the adjacent baths, communicated with a supply of magnetostrictive transducers, and the pump of the circulation unit, the suction nozzle through which the filter is communicated with the lower part of each adjacent bath, and the discharge pipe is introduced into the upper part of each of the adjacent baths, the mechanism of leaching of the third adjacent tubs made in the form of a circulating pump unit, the pump suction which is communicated with the lower part of the third connecting baths, and pressure pipe with nozzles in the upper part of the drying chamber is made adjacent to the third ensuite bath with a vertically movable up and down sliding dampers, where the mechanism of drying is made in the form of a heater with recirculation wiring ducts with flow in the lower part and the output from the upper part of the drying chamber, and the transport is made in the form of net transport container is transported from the bath into the tub, and a conveyor to move through the drying chamber and / or cooling and unloading.

2. Line p. 1, characterized in that as the device is heated degreasing solution used tubular paralarval, built-in tub.

 

Same patents:

The invention relates to nuclear energy and may find application in the manufacturing of fuel elements fuel elements for fuel assemblies fuel assemblies of nuclear power reactors (YAR)

The invention relates to nuclear power and may find application in the manufacturing of fuel elements for nuclear reactors

The invention relates to nuclear energy and may find application in the manufacturing of fuel elements fuel elements and fuel assemblies fuel assemblies of nuclear power reactors

The invention relates to the field of nuclear energy and can be used to control the tightness of the fuel elements (cartridges) with shells made of zirconium alloys at the stage of their production

The invention relates to nuclear power, may find application in the manufacturing of fuel elements (FE), and more specifically to education in the membranes of the fuel rod of an alloy of zirconium to niobium protective oxide film

The invention relates to nuclear power and may find application in the manufacture of fuel elements (FE) for a nuclear reactor

The invention relates to nuclear energy and may find application in the manufacturing of fuel elements for fuel assemblies of nuclear power reactors in waste classification after fabrication of the fuel element cladding

The invention relates to nuclear energy and may find application in the manufacturing of fuel elements in automatic lines for unloading, loading, interoperable transportation and carrying out technological operations

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

The invention relates to a method for preparing a mixed oxide (U, Pu)O2from stagnant powders UO2

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.

1 dwg

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.

2 cl

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

Up!