A method of manufacturing technology of a witness sample of fuel element

 

A method of manufacturing technology of a witness sample of fuel elements relates to atomic energy and may find application in the manufacturing of fuel elements for nuclear reactors under their control. As the shell for technological witness samples using a piece of a tube of cladding material for fuel elements. As technological plugs used reusable extension cable. The diameter equals the outside diameter of the shell. The length of the diameter of the shell is equal to the difference between the length of the shell for the fuel element and the length of the tube. The cut tube pre-operates with one end of the connecting node in the form of a collet with an open end section of the shell. From the other end perform docking site in the form of a recess. The latter repeats the shape of the upper part of the stub welded to the end of the segment membranes. Provided the reduction of consumption of zirconium alloy manufacture process of a witness sample of the fuel element. 3 Il.

The invention relates to nuclear energy and may find application in enterprises izgotovlenie fuel Rods is largely determined by the quality of welded joints. It is directly linked to the weldability of used materials, construction compounds, process for their implementation and flexibility properties during operation under the influence of temperature, neutron flux, stress, environment (coolant inside Talinay).

The main task of sealing is to preserve the integrity of the fuel Rods during the entire period of operation and their subsequent storage and transportation up to the point of destruction operations regeneration fuel, however, when the seal - welding the caps to the shell of possible defects that are either identified during the inspection or able to open up during operation (see Development, production and operation of fuel cell power reactors. Book 2. Edited by F. G. Reshetnikov. M.: Energoatomizdat, 1995, S. 181, 184).

The closest in technical essence and the achieved effect is a method of manufacturing a fuel element, including manufacturing shell with a plug on one end, having its seat in the shell “flats”, which forms the technological channel with the inner surface of the shell and technological channel in the welded joint, naplavlyaemykh when electricity is practical stub and equipment fuel sealing contact butt welding the other end of the shell with blank under the pressure of the inert gas under cover (see Patent of the Russian Federation 2127457, IPC 6 G 21 C 3/10, 21/00, 21/02, 23 To 11/02, 15/00 from 04.06.1997).

Each of these types of welding has advantages and disadvantages, depending on many factors: the welding parameters, the settings of the welding machine to the welding mode, before you start it, after repair, after the release of a certain quantity, etc.

In this regard, technological prepare the sample in accordance with OST 95.503-84, repeating on welded connection, which checks the condition of process equipment, instrumentation, that they are configured correctly, the line cycle and the parameters of the operation specified. Prepare and witness samples for laboratory tests, repeating on the welded connection of a fuel rod manufactured according to the standard technology.

By the standard technology in accordance with the patent 2127457 tube is subjected to trimming of the ends in the size of the shell with the corresponding corners of the ends for welding, sizing one end, washing, drying, Assembly calibrated end shell blank having, on its seat in the shell “flats”, which forms the technological channel with the inner surface of the shell and technological channel of weld is of once the shell of the plug in the camera, vacuum internal volume through technological channels in the cover when closed, the other end of the shell process stub, electron beam welding the caps to the shell with zaplavleniem channels, and after equipment fuel sheath at the other end of the seal pin-butt welding stub to the shell under the pressure of the inert gas under the shell.

In accordance with the structures of electron-beam installation and setup contact-butt welding the length of the process and witness samples must match the length of a fuel rod, i.e., after the appropriate tests destructive method of controlling the shell of an alloy of zirconium to niobium goes into marriage.

Technical challenge is the reduction of consumption of zirconium alloy manufacture process of a witness sample of the fuel element.

This technical problem is solved in that in the method of manufacturing technology of a witness sample of the fuel element, including manufacturing shell with a plug on one end, having its seat in the shell “flats”, which forms the technological channel with the inner surface of the shell and technological channel in the welded joint, zaplavlyali the Oia technological plugs are sealed by this welding the other end of the shell with blank under the pressure of the inert gas under the shell; according to the invention as a membrane for the process sample witness used a piece of a tube of cladding material for fuel elements with ends prepared for welding, as well as technological plugs used reusable extension cable with diameter equal to the outside diameter of the shell with length equal to the difference between the length of the shell for the fuel element and the length of the tube, which has previously performed with one end of the connecting node in the form of a collet with an open end section of the shell, and the other end connecting node in a groove of the same shape, the upper part of the stub welded to the end of the segment of the shell.

The proposed method of manufacturing technology of a witness sample of the fuel element will be used for this purpose, not the whole tube and the waste from cutting the tube in the size of the fuel cladding, to reduce the consumption of zirconium alloy with niobium and to provide appropriate destructive testing of welds as electron beam welding, and contact-butt welding.

The drawing shows:

Fig.1 - General view of the electron-beam welding;

Fig.2 - General view consicence witness samples of the fuel element includes the steps of manufacture of the shell 1 with a cover 2 at one end, having on its seat in the casing 1 “flats”, which forms a technological channel 3 with the inner surface of the shell 1 and the processing channel 4 in the welded joint, naplavlyaemykh by electron-beam welding 5 with a closed technological blank 6 the other end of the shell 1, the sealing after removal of technological plugs 6 flash butt welding 7 the other end of the shell 1 by a plug 8 under the pressure of the inert gas under the shell 1.

As the shell 1 for technological witness sample 9 used a piece of a tube of the sheath material after cutting it to the size of the fuel cladding. The ends of the segment-shell 1 is prepared for welding electron beam and flash butt.

As technological plugs 6 are used reusable extension cable with diameter D equal to the outer diameter D1 of the sheath 1 with length L, equal to the difference between the length L1 of the shell for the fuel element and the length L2 of the segment of the tube-shell 1 L=L1-L2.

The extension previously performed at one end of the connecting node in the form of a gripper 10 with the open end of the segment-shell 1, and the other end connecting node in a groove 11 in the shape of the upper stub 2, is welded to the t welding the ends of the shell, having a length L1 equal to the length of a fuel rod, i.e., ~4 m

In this regard, for welding the ends of the segment-shell proposed extension, which allows for sealing both ends of the segment-shell 1.

When electron beam welding 5 stub 2 by the end of the segment-shell 1 at the other end is sealed collet 10 extender role sealed technological plugs 6. Through technological channels 3,4 carry out the evacuation of the inner volume of the segment-shell 1 includes the rotation and the electron beam 12 is the penetration of technological channels 3, 4 and the welding joint.

Segment-shell 1 is welded to the cap 2 is removed from the collet 10 and the plug 2 is inserted into the recess 11 of the extension, and then open end for flash butt welding 7 stub 8 under the pressure of the inert gas under cover of technological witness sample 9.

Claims

A method of manufacturing technology of a witness sample of the fuel element, including manufacturing shell with a plug on one end, having its seat in the shell “flats”, which forms the technological channel with the inner surface of the shell and breadboard the other end of the shell, and after the removal process stub - sealing contact butt welding the other end of the shell with blank under the pressure of the inert gas under a shell, wherein the shell for technological witness samples using a piece of a tube of cladding material for fuel elements with ends prepared for welding, as well as technological plugs used reusable extension cable with diameter equal to the outside diameter of the shell with length equal to the difference between the length of the shell for the fuel element and the length of the tube, which has previously performed with one end of the connecting node in the form of a collet with an open end section of the shell, and with the other end of the connecting node in a groove of the same shape, the upper part of the stub welded to the end of the segment membranes.

 

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