(19)
(11) EP 1 496 520 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION

(48) Corrigendum issued on:
30.03.2005 Bulletin 2005/13

(43) Date of publication:
12.01.2005 Bulletin 2005/02

(21) Application number: 04015922.0

(22) Date of filing: 06.07.2004
(51) International Patent Classification (IPC)7: G21C 19/37
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL HR LT LV MK

(30) Priority: 09.07.2003 JP 2003194325
01.08.2003 JP 2003285154

(71) Applicant: Japan Nuclear Cycle Development Institute
Ibaraki-ken 319-1184 (JP)

(72) Inventors:
  • Yamada, Seiya c/o Tokai-Works
    Naka-gun Ibaraki-ken, 319-1194 (JP)
  • Takeuchi, Masayuki c/o Tokai-Works
    Naka-gun Ibaraki-ken, 319-1194 (JP)
  • Koizumi, Tsutomu c/o Tokai-Works
    Naka-gun Ibaraki-ken, 319-1194 (JP)
  • Suyama, Kazumasa c/o Nagasaki Shipyard& Mach.Works
    Nagasaki-shi, Nagasaki-ken (JP)
  • Takami, Kazuo c/o Nagasaki Shipyard& Mach. Works
    Nagasaki-shi, Nagasaki-ken (JP)
  • Hara, Teruo c/o Nagasaki Shipyard & Mach. Works
    Nagasaki-shi, Nagasaki-ken (JP)

(74) Representative: Henkel, Feiler & Hänzel 
Möhlstrasse 37
81675 München
81675 München (DE)

   


(54) Decladding method and decladding device for spent nuclear fuel reprocessing


(57) Decladding method and device of spent nuclear fuel are provided by which fuel pins can be easily and efficiently removed from the spent nuclear fuel. Spent nuclear fuel pins P, made of austenitic stainless steel, in which the spent nuclear fuel is filled are fed by a feeder 7 one by one or by a unit of several pins and finely sheared into fragments by a shredder 1 comprising plural rotating blades 4, 5 so that the fragments are of a size of 1 to 2 mm or less. The sheared fragments are separated into a fuel pin portion and a nuclear fuel portion by a magnetic separator 20. The magnetic separator 20 comprises a vibration feeder 27 feeding the sheared fragments and is arranged below the shredder 1. Without using a dissolving liquid of nitric acid or the like, decladding is done and the spent nuclear fuel can be efficiently obtained.