RU2222388C1 - Fuel element production waste separating drum unit - Google Patents

Abstract

FIELD: nuclear power engineering. SUBSTANCE: proposed drum unit that can be used at factories producing fuel elements for reactor fuel assemblies to classify wastes upon manufacturing fuel element claddings provides for separating cladding scrap from zirconium alloy shavings. Device has revolving drum formed by rods secured at ends over generating line with slit-like holes in-between, their width exceeding diameter of cladding scrap; charging and discharging unit is, essentially, hinged cover sector of rods attached to revolving drum body whose outside surface carries coaxially arranged second drum built of two parts of which upper one is removable part and serves as cover for charging and discharging unit; lower part is hinged on shaft and functions as tray for receiving cladding scrap and discharging it; it is provided with detergent inlet and outlet pipes. EFFECT: enlarged functional capabilities of drum unit. 1 cl, 2 dwg

Description

 The invention relates to a device for the separation of waste production of fuel elements.

 In the process of manufacturing the shells of a zirconium-niobium alloy for fuel elements (fuel rods), they cut the tubes on both sides to the size of the cladding of a fuel rod with the corresponding preparation of the ends for welding (see patent RU 2155395 of 02.17.1999 "Automatic line for the manufacture of fuel rods").

 When cutting tubes and preparing the ends, a significant amount of chips and scraps from an alloy of zirconium with niobium accumulate. It is known that shavings and sawdust easily ignite (see. "Zirconium metallurgy." Translation from English under the editorship of GA Meerson - M .: Publishing House of Foreign Literature, 1959, p. 405), which is a known danger when stored and transportation.

 In this regard, zirconium chips are burnt in place, while segments of zirconium tubes are transported for re-melting to other enterprises. However, the waste of fuel production in the form of a mixture of chips and scraps is very difficult to separate, i.e. separate the chips from the pipe scraps.

 The closest in technical essence and the achieved effect is a drum device for separating waste products of fuel elements, containing a rotating drum with slotted holes, a rotation drive coaxially placed on the outside of the rotating drum, a second drum, a loading and unloading unit (see patent US 5915569 A, Cl. B 03 V 7/00, 07 V 1/22, publ. 06/29/1999, pp. 1-10). A drum device for separating chips from pipe scraps cannot be used without changing its design. An object of the invention is the separation of pipe scraps from the chips of zirconium alloy.

This technical problem is solved in that in a drum device for separating waste products of fuel elements containing a rotating drum with slotted holes, a rotation drive coaxially placed on the outside of the rotating drum, a second drum, a loading and unloading unit;
according to the invention, the rotating drum is formed by rods fixed to the ends along the generatrix with slotted openings between them with a width exceeding the diameter of the cutting tubes, the loading and unloading unit is made in the form of a sector — a hinged hinged lid made of rods fixed to the body of the rotating drum, the second drum is made of the two halves, the upper of which is removable and is the cover of the loading and unloading unit, and the lower is pivotally mounted with the possibility of rotation on the shaft, is a pallet for collecting tubes-scraps, them ygruzki provided with nozzles and the wash liquor input and output.

 This embodiment of the drum device will allow you to separate the tube cuttings from the zirconium alloy chips due to their centrifugal rotation, in which due to the centrifugal forces the tube cuttings from the rotating drum through the slotted holes enter the pallet and unloading, and the chips remain in the rotating drum and in the form of a lump can be removed from it through a hinged lid.

The drawings show a drum device for separating waste from the production of fuel elements, where:
figure 1 - General view, the moment of loading;
figure 2 - General view, the time of unloading.

 The drum device for separating waste in the form of pipe scraps of the shells of the fuel elements from zirconium alloy chips contains a rotating drum 1 with a rotation drive 2 and a combined loading and unloading unit 3. The rotating drum 1 along the generatrix is formed by rods 6 fixed to the ends 4, 5 with slotted openings 7 between them with a width "S" of slotted openings 7 exceeding the diameter "D" of the cutting tubes 8.

 The combined node 3 of the loading and unloading is made in the form of a sector - a hinged-folding cover of the above rods 6, fixed to the housing of the rotating drum 1.

 A second drum 9 is made coaxially rotating drum 1 on its outer side, made of two halves, in which the upper removable half is the cover 10 of the loading and unloading unit 3, and the lower half is articulated-rotary on the shaft 11, is a collection tray of trimming tubes, their unloading unit and is equipped with nozzles 12, 13 input and output of the washing solution.

 A drum device for separating waste production of fuel elements operates as follows.

 In the rotating drum 1 during its stop through the combined unit 3 of the loading-unloading load the production of fuel rods in the form of a mixture of chips and tubes-scrap 8 of zirconium alloy used for the manufacture of cladding of fuel rods.

 The sector - hinged hinged lid of the rods 6 is closed and secured to the housing of the rotating drum 1, also made of rods 6. The removable lid 10 of the second drum 9 is closed and in its lower half - the pallet - pour the washing solution through the nozzle 12. Turn on the drive 2 rotation drum 1. Due to the centrifugal forces of the trimming tube 8, through the slotted holes 7 formed by the rods 6 fixed to the ends 4, 5, they enter the lower half — the pallet — of the second drum 9, and the chips in the rotating drum roll into a lump.

 Simultaneously with the separation of the tube-scrap 8 from the chips, they are washed. At the end of the process, the washing solution through the nozzle 13 is removed, the lid 10 of the drum 9 is removed, and shavings in the form of a lump from the drum 1 are unloaded through the node 3, and the bottom half of the drum 9 — the pallet — is rotated on the shaft 11 and the trimming tubes 8 are unloaded.

 The device is accepted for commercial use.

Claims (1)

A drum device for separating waste from the production of fuel elements, comprising a rotating drum with slotted holes, a rotational drive coaxially placed on the outside of the rotating drum, a second drum, a loading and unloading unit, characterized in that the rotating drum is formed by rods with slotted holes fixed to the ends along the generatrix between them with a width exceeding the diameter of the trimming tubes, the loading and unloading unit is made in the form of a sector of a hinged hinged cover from the rods, fixed being attached to the housing of the rotating drum, the second drum is made of two halves, the upper of which is removable and is the cover of the loading and unloading unit, and the lower one is pivotally mounted with the possibility of rotation on the shaft and is a tray for collecting trimming tubes, unloading them and equipped with input pipes and conclusion of the washing solution.

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