The automatic line control and inspection of fuel elements

 

The automatic line control and inspection of fuel elements intended for use in nuclear engineering. In the device after installationabsorption control placed puller spring clamps from the open end of the curb of the fuel cladding. The puller is made in the form of rotatable around its axis and movable in the axial direction with the possibility of entering inside the locked section of the spring retainer in the fuel cladding of the rod. On the last length greater than the length separated in the fuel cladding of the section of the spring retainer made a spiral groove with the direction of the coils is identical to the direction of the turns of the spring retainer. The width and depth of the helical grooves is made sufficient to ensure engagement of the helical groove of the rod with the coils of the spring retainer. The spacing between the turns of the helical grooves made more step between the coils rasklinivanie section of the spring retainer. Enhances the yield of fuel pellets and the cladding when removing from it the spring retainer. 1 C.p. f-crystals, 2 Il.

The invention teplovidelyaushy elements (FE), mainly for nuclear water-water energetic reactor (WWER). Known automatic line for fixing the column of fuel pellets in the fuel element, implemented spring retainer in the form of two spiral interconnected sections, one of which with a diameter smaller than the inner diameter of the fuel cladding - fixing the column of fuel pellets, and the other with a diameter greater than the diameter of the fuel cladding - rasklinivanie inside the shell containing the drive shaft input into the open end of the filled fuel tablets shell of the spring retainer retainer section forward (see RF Patent 2154311 on the application 98106735/06 from 07.04.1998,, IPC 7 G 21 3/00, 21/02).

The known device provides only the fixation of the column of fuel pellets in a fuel rod, but does not control the correct Assembly of the main components of a fuel rod in his rig and remove the spring retainer from defective fuel elements. The closest to the technical conditions and the achieved effect is device control and inspection of fuel elements at the facilityabsorption control after pixelqi main components, including determining the length of a column of fuel pellets, the gap between the fuel pellets, the length of the gas collector, the presence of the spring retainer, chips fuel pellets in gazosbornik, ruptured fuel pellets or chips of fuel pellets caught in the gap between the fuel pellets (see Development, production and operation of fuel cell power reactors. Book 2. Edited by F. G. Reshetnikov - M.: Energoatomizdat, 1955, S. 280-283).

The device provides for control and grading curb fuel tablets shells TVEL with spring clips inside on the above parameters before they are sealed, but the complete disassembly of major components rejected curb membrane of a fuel rod prevents a spring clamp, which rasklinivanie section locked inside a filled shell. It is known that the sheath of the fuel element for LWR power reactors are made of an alloy of zirconium, 1% niobium (see Development, production and operation of fuel elements. Book 1. Edited by F. G. Reshetnikov - M.: Energoatomizdat 1995, S. 126-127) and it is also known that zirconium is prone to corrosive corrosion, poyavlyayas is O. Ed. by G. A. Meyerson, Y. C. Gagarin. M.: Publishing house of foreign literature, 1959, S. 298), then removing the spring retainer from the curb shell without damaging it due to locked in her section of the spring retainer is a certain difficulty, so as to simply pull the spring retainer from the shell of a fuel rod will cause the fins on its inner surface, and cut the shell along with her spring retainer puts the shell in the final marriage and the segment could be damaged fuel pellets.

An object of the invention is to increase the yield by maintaining fuel pellets and the cladding when removing from it the spring retainer.

This technical problem is solved in that in the automatic line control and inspection of fuel elements at the facilityabsorption control on the correct Assembly of the main components in the fuel cladding after fixation device spring retainer with rasklinivanie and the locking sections of the column of fuel pellets in the fuel cladding; according to the invention after installation-absorp is forged whenabsorption control, made in the form of rotatable around its axis, movable in the axial direction with the possibility of entering into separated sections of the spring retainer in the shell of a fuel rod rod, on which a length greater than the length locked in the sheath of the fuel element section of the spring retainer made a spiral groove with the direction of the coils is identical to the direction of the turns of the spring retainer, the width, the depth of the screw groove is made sufficient to ensure engagement of the helical groove of the rod with the coils of the spring retainer, and the pitch between the turns of the helical grooves made more step between the coils rasklinivanie section of the spring retainer.

Another difference is that the width of the helical grooves made in 3-3,5 times the diameter of the wire of the spring retainer, and the depth of the helical grooves is larger than the diameter of the wire of the spring retainer. All design parameters puller optimal and any change will degrade its performance.

This embodiment of the automatic line will be drawn from the rejected TVEL spring clips without damage to the fuel pellets, the inner part of the membrane of a fuel rod and directly themselves spring clamps, Kotor will increase the yield of the fuel element.

In Fig. 1 presentsabsorption install control and removal spring clamps; Fig. 2 - puller spring clamps (manual).

The automatic line control and inspection of the fuel element 1 contains the installationabsorption control 2, comprising measuring unit 3, located on the pulling mechanism 4 Rods 1 and unit 5 of the information processing. In the measuring unit 3 has two sourceradiation 57, translucent fuel rod 1 in two mutually perpendicular directions by two collimated streamsquanta. The dimensions of the slit collimators: 0.45 mm along the axis of the fuel rod and 7 mm in the transverse direction (not shown). The detectors used sintillation blocks detektirovaniya with crystal with a diameter of 10 mm and thickness of 10 mm and the photomultiplier tube PMT-675 (not shown).

Speed drawing of a fuel rod 1 through the measuring unit is controlled by the sensor 6, consisting of pressed against the fuel rod 1 of the measuring roller, the axis of which sits a code disc 7 with slots on the periphery and a photosensor (not shown). The geometric dimensions of the roller and the number of holes (slits) on the code disk 7 is chosen t 1 contains a shell 8 with the lower cap 9, inside the post 10 fuel pellets, fixed in the shell 8 spring retainer, which section 11 in contact with the pole 10, - fixing, and section 12 is locked in the shell 8.

The device is equipped with a sensor, 13 stops the axial movement of the fuel rod 1, respecively 14, kickers 15 fit the fuel rod 1 and the stripper 16 spring clamps from the open end of a filled shell of a fuel rod 1, is rejected atabsorption control installation 2absorption control. Puller 16 spring clamps can be accomplished in two ways:

(a) rotatable around its axis and movable in the axial direction using the mechanisms of displacement and rotation (see Fig.1),

b) rotating around its axis and movable in the axial direction of manual performance (Fig.2).

The stripper 16 both versions rod is made with the possibility of entering inside the locked section 12 of the spring retainer in the shell of the fuel rod 1. On the rod puller 16 on the length of the “L” made a spiral groove 17, which is more “L1” locked section 12 of the spring retainer in the shell of the fuel rod 1 with the direction of the coils is identical to the directions of the turns of the spring retainer (Aza (L>D), depth “S” spiral grooves more “D”, the wire (S>D) the spring retainer, and step L3” coils of the helical grooves 17 more step “L4) turns locked in the sheath of the fuel element 1 of section 12 of the clamping latch “L3>L4”.

The device works in the following wayabsorption installing 2 FE 1 after equipment and installation of the retainer with rasklinivanie 12 and retainer 11 sections and column of fuel pellets 10 within shell 8 bottom cover 9 forward on the mechanism 4 is moved through the measuring unit 3 and the sensor 6 with a code disk 7. The measurement results are transmitted to the processing unit 5 of the information.

The fuel rod 1 is discarded if:

1) the length of the gap between the bottom cover and fuel tablet exceeds 3 mm,

2) the length of the gap between the fuel pellets exceeds 3 mm,

3) the sum of the clearances exceed 8 mm,

4) the chip exceeds 6-2,5 mm2,

5) the volume of single crumb in the compensation gap exceeds 8 mm2,

6) the length of the gap between the last fuel tablet and lock exceeds 4 mm,

7) the length of the compensation gap is greater than or less (20914) mm

After stopping the movement of the fuel rod 1 sensor 13 are given the command to brasiltelecom puller 16 with a screw groove 17 to lock with the locking section 11 of the spring retainer and the rotation of the latter around its axis is the engagement of the turns of the helical groove 17 with the coils separated sections 12, included in the helical groove 17.

Due to the fact that the length “L” of the helical groove 17 is greater than the length “L1), separated section 12 of the spring retainer, the width “L2”screw groove 17 is larger than the diameter “D” of the wire of the spring retainer, the depth “S” screw groove 17 is larger than the diameter “D” of the wire of the spring retainer and step L3” coils of the helical grooves 17 more step “L4” turns separated section 12 of the spring retainer L3>L4then, while rotating around its axis rod puller 16 wire rasklinivanie section 12 of the clamping pawl will take place in the spiral groove 17, and the step “L4” turns wedging portion 12 will increase becomes equal step “L3” coils of the helical groove 17 will be reduced by stretching the diameter rasklinivanie part and a spring clamp freely extracted from the shell 8 of a fuel rod 1 without any damage.

A stripper spring clamps has been tested and recommended for implementation, a positive result was achieved.

Claims

1. The automatic line control and inspection of fuel elements at the facilityabsorption kansasii spring retainer with rasklinivanie and the locking sections of the column of fuel pellets in the fuel cladding, characterized in that the device after installationabsorption control placed puller spring clamps from the open end of the curb of the fuel cladding, rejected atabsorption control, made in the form of rotatable around its axis, movable in the axial direction with the possibility of entering inside the locked section of the spring retainer in the fuel cladding of the rod on which a length greater than the length separated in the fuel cladding of the section of the spring retainer made a spiral groove with the direction of the coils is identical to the direction of the turns of the spring retainer, the width and depth of the helical grooves is made sufficient to ensure engagement of the helical groove of the rod with the coils of the spring retainer, and the pitch between the turns of the helical grooves made more step between the coils rasklinivanie section of the spring retainer.

2. The automatic line control and inspection of fuel elements under item 1, characterized in that the width of the helical grooves made in 3-3,5 times the diameter of the wire of the spring retainer, and the depth of the helical grooves Bo

 

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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

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