Manufacture Of Fuel Elements Or Breeder Elements Contained In Nonactive Casings [g21c-21/02] Patents (Class 976/DIG283)

Digests

By vibrational compaction or tamping of fuel in the jacket [g21c-21/04] (Class 976/DIG284)
By rotatable swaging of the jacket around the fuel [g21c-21/06] (Class 976/DIG285)
By a slip-fit cladding process; by crimping the jacket around the fuel [g21c-21/08] (Class 976/DIG286)
By extrusion, drawing, or stretching; by rolling (e.g., "picture frame" technique) [g21c-21/10] (Class 976/DIG287)
By hydrostatic or thermo-pneumatic cannings (in general by pressing without lenthening, e.g., explosive coating) [g21c-21/12] (Class 976/DIG288)
By plating the fuel in a fluid [g21c-21/14] (Class 976/DIG289)
By casting or dipping techniques [g21c-21/16] (Class 976/DIG290)
Manufacture of control elements covered by dig. 113+ [g21c-21/18] (Class 976/DIG291)
  • Manufacture of zirconium cladding tube with internal liner
    Patent number: 5620536
    Abstract: A method of manufacturing nuclear fuel elements which include fuel rods whose cladding tubes are provided with an internal liner layer to obtain PCT resistance in the nuclear fuel element involves carefully choosing parameters for heat treatment of the inner component even from the machining of an ingot of the inner component. The internal layer of zirconium or a zirconium alloy, suitable as inner layer in a PCI-resistant cladding, from the fabrication of an ingot of the inner component up to the completion of a cladding tube, including forging, rolling, extrusion, heat treatment and final heat treatment, is manufactured in such a way that the temperature in the inner component never exceeds the temperature when an incipient phase transformation to beta phase takes place.
    Type: Grant
    Filed: August 11, 1994
    Date of Patent: April 15, 1997
    Assignee: ABB Atom AB
    Inventor: Mats Dahlb ack