(19)

(11)

EP 0 906 624 A1

(12)

(43) Date of publication: 07.04.1999 Bulletin 1999/14 (21) Application number: 97928610.0 (22) Date of filing: 18.06.1997

(51) International Patent Classification (IPC):  G21C 3/ 336( . ) (86) International application number: PCT/SE1997/001083 (87) International publication number: WO 1997/049093 (24.12.1997 Gazette 1998/03)

(84) Designated Contracting States: CH DE ES FI LI SE (30) Priority: 20.06.1996 SE 19960002454 (71) Applicant: ABB ATOM AB 721 63 Västeras (SE)	(72) Inventors: NYLUND, Olov S-720 17 Västeras (SE) SAHLIN, Thorbjörn S-722 40 Västeras (SE) (74) Representative: Sjöholm, Annette, et al  Asea Brown Boveri AB Patent 721 78 Västeras 721 78 Västeras (SE)