Nuken Technologies Gmbh

Nukem Technologies Gmbh

Karl Froschauer

Martin Kadner

Georg Braehler

Werner Heit

Guo Wenli

Liang Tonxiang

Tang Chunhe

Yaping Tang

A method and an arrangement for producing spherical fuel cores and/or breeder material cores by dripping a pouring solution containing uranyl nitrate and a solution containing at least one auxiliary agent into an ammoniacal precipitation bath to form microspheres, aging, washing, drying, and thermally treating the microspheres. In order to provide a continuous production method along with a constantly high core quality, it is proposed that 1) the microspheres from the precipitation bath be separated through a first separator and fed to the ammoniacal aging water for aging, 2) the contact duration of the microspheres with the liquid of the precipitation bath before being introduced into the aging water be set equally or substantially equally, 3) the microspheres be transferred from the aging water to a multi-stage cascade scrubber using a transfer device, wherein the microspheres are washed in the multi-stage cascade scrubber so as to be free or substantially free from ammonium nitrate and at least one auxiliary agent contained in the microspheres, and 4) after drying, the microspheres be calcinated while distributed in a monolayer during a thermal treatment.

Method and arrangement for producing fuel kernels

A method for the production of spherical combustible or fertile material particles from an oxide of the group of the heavy metals uranium, plutonium, or mixtures thereof. For this purpose, the process steps of producing a base solution of the nitrates of the heavy metal(s), adding at least one first reagent in order to adjust the viscosity of the solution, dropping the solution to form microspheres, at least superficially solidifying the microspheres in an atmosphere containing ammonia, collecting the microspheres in a solution containing ammonia, and subsequent washing, drying and thermal treatment are carried out, where at least one of urea, ammonium carbonate, ammonium hydrogen carbonate, ammonium cyanate, and biuret are added to the base solution before adding the first reagent. The solution thus prepared is heated to a temperature T where 80&#xb0; C.&#x2266;T&#x3c;Tand where T=boiling temperature of the solution, and is maintained at the temperature over a time period t where 2 h&#x2266;t&#x2266;8 h.

Method for the production of spherical combustible or fertile material particles

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Freigericht, Germany

Karl Froschauer