method and device for recovery of the kernbrennstoffes from fuel graphitmoderierter reactors

摘要

1329585 Processing spent nuclear fuel NUKEM NUKLEAR-CHEMIE UND METALLURGIE GmbH 4 Dec 1970 [5 Dec 1969] 57634/70 Heading G6R Nuclear fuel is recovered from carboncontaining fuel elements by charging the unground fuel element to a cooled blast furnace and burning the structure and matrix graphite at 800-1100‹ C. in a downwardly-flowing mixture of oxygen and gaseous coolant, discharging fuel particles still coated with pyrolytic carbon through a grid into a second furnace where the pyrolytic carbon is burnt off with upwardly-flowing oxygen at 600-900‹ C. The oxygen may be diluted with steam, nitrogen, or carbon dioxide. Gas having different oxygen contents may be introduced at different levels into the first furnace. The waste gases from the two stages may be filtered, cooled, and recycled. Suitable apparatus is described with reference to a drawing.