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Equilibrium Concept for the Assessment of the Actinide Release from Waste Forms into Salt Brines

Published online by Cambridge University Press:  26 February 2011

G. Rudolph ,
P. Vejmelka  and
R. Köster
G. Rudolph
Affiliation:
Kernforschungszentrum Karlsruhe GmbH, Postfach 3640, D-7500 Karlsruhe 1, Federal Republic of Germany
P. Vejmelka
Affiliation:
Kernforschungszentrum Karlsruhe GmbH, Postfach 3640, D-7500 Karlsruhe 1, Federal Republic of Germany
R. Köster
Affiliation:
Kernforschungszentrum Karlsruhe GmbH, Postfach 3640, D-7500 Karlsruhe 1, Federal Republic of Germany
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Abstract

A novel approach for the assessment of the radionuclide release from a nuclear waste repository after an accidental water ingression is proposed: after a short time a stable final condition is assumed to be established in the near-field of the waste form in which each radionuclide is at equilibrium between the dissolved phase and the various solid phases. The total release may be assessed from the concentration in solution and the flow rate out of the near-field.

An experimental program stimulated by this concept includes studies on the solubility of actinide compounds in salt brines in equilibrium with cement. In Q-brine (a salt brine rich in magnesium chloride, pH = 6.5) the concentrations of U, Np, Pu and Am in solution are determined by a sorption equilibrium, in sodium chloride brine (pH = 12–13) by the solubility of the respective hydroxide.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 701
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

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