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Investigations Into the Mobilization of Actinides From ILW Conditioned in Cement and Bitumen and Studies of their Sorptive and Migration Behaviour in Both the Near- and Far-Fields for a Repository Contained in a Deep Salt Environment

Published online by Cambridge University Press:  28 February 2011

A. R. Flambard ,
H.-U. Fusban ,
Ch. Keiling  and
G. Marx
A. R. Flambard
Affiliation:
Dept. of Radiochemistry, Institute of Inorganic & Analytical Chemistry, Free University of Berlin, Fabeckstralße 34–36, D-1000 Berlin 33, Federal Republic of Germany
H.-U. Fusban
Affiliation:
Dept. of Radiochemistry, Institute of Inorganic & Analytical Chemistry, Free University of Berlin, Fabeckstralße 34–36, D-1000 Berlin 33, Federal Republic of Germany
Ch. Keiling
Affiliation:
Dept. of Radiochemistry, Institute of Inorganic & Analytical Chemistry, Free University of Berlin, Fabeckstralße 34–36, D-1000 Berlin 33, Federal Republic of Germany
G. Marx
Affiliation:
Dept. of Radiochemistry, Institute of Inorganic & Analytical Chemistry, Free University of Berlin, Fabeckstralße 34–36, D-1000 Berlin 33, Federal Republic of Germany
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Abstract

Experiments have been carried out into the leaching of ILW conditioned in cement and bitumen in concentrated salt solutions. Although difficult to observe with real waste leachates, investigations into the leaching of a simulated waste in cement have indicated leached transuranic levels of ca. 10−9 M ; the amount of activity leached by a quinary salt solution being 102 - 103 times higher . This has been interpreted in terms of a pH effect. For the real waste, spectroscopy has indicated a significantly larger release of Cs from cement than from bitumen. For all waste samples a notable absence of colloidal material was observed ; an observation which can be explained in terms of the high solution ionic strengths and the corresponding influence upon radionuclide solvation.

Transuranic mobility studies through salt and sand from a salt dome in Northern Germany have shown the presence of at least two types of species of wildly differing mobility ; one migrating with approximately the same velocity as that of the solvent front and the other strongly retarded. Actinide recoveries (i.e. that passing through the columns) could be strongly influenced by either changing the system pH or by the addition of a competitor such as Ce ; the latter effect pointing to a competitive sorption.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 691
Copyright
Copyright © Materials Research Society 1985

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