(19)

(11)

EP 0 646 050 A1

(12)

(43) Date of publication: 05.04.1995 Bulletin 1995/14 (21) Application number: 94912619.0 (22) Date of filing: 15.04.1994

(51) International Patent Classification (IPC):  G01B 11/ 02( . ) B08B 5/ 02( . ) G01B 11/ 22( . ) B08B 5/ 00( . ) B08B 9/ 02( . ) (86) International application number: PCT/GB1994/000792 (87) International publication number: WO 1994/023853 (27.10.1994 Gazette 1994/24)

(84) Designated Contracting States: AT BE CH DE ES FR GB IT LI NL SE (30) Priority: 15.04.1993 GB 19930007791 (71) Applicant: British Nuclear Fuels PLC Risley Warrington Cheshire, WA3 6AS (GB)	(72) Inventors: STATHAM, Roy Warrington, Cheshire WA3 6AS (GB) WILKINS, John Seascale, Cumbria CA20 1PG (GB) BARRET, Carsten, Lawrence Seascale, Cumbria CA20 1PG (GB) (74) Representative: McCormack, Derek James  British Nuclear Fuels plc, Patents Section, Legal Department Risley, Warrington, Cheshire WA3 6AS Risley, Warrington, Cheshire WA3 6AS (GB)