Investigation of low and medium-level cemented waste forms from reprocessing
Waste form studies serve to determine the radiation release from low and intermediate level cemented waste forms via the water path (leaching). This work concentrated on the behaviour of actinide elements. Besides a kinetic approach, a concept of chemical equilibrium was used for the quantitative description of radionuclide mobilisation. According to this concept, a thermodynamic equilibrium between the solid phases (waste form, container material, back filling) and a solution phase (brine) is established for each radionuclide. As a result of the investigation of the equilibrium concentrations for the respective waste form/brine system under specific conditions, maximum values of the radionuclide concentrations were obtained, which could be used in safety considerations. The majority of investigations were performed on a laboratory scale with tracered samples (uranium, americium, plutonium, neptunium). Laboratory experiments were also carried out with real cemented waste forms, in order to examine whether the results obtained with tracered samples could be transferred to real waste forms. A limited number of experiments were performed with inactive and active (real) full-scale samples (200 1). These investigations were carried out to determine the influence of the cementation process on the waste form properties.
Bibliographic Reference: EUR 13544 EN (1991) 32 pp., FS, ECU 5
ISBN: ISBN 92-826-2736-5
Record Number: 199110988 / Last updated on: 1994-12-02
Original language: en
Available languages: en