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Selective Extraction of Minor Actinides from High Activity Liquid Waste by Organised Matrices (CALIXPART), Final Technical Report

Project ID: FIKW-CT-2000-00088
Funded under: FP5-EAECTP C


Reduction of the volume of wastes to be disposed off in geological formations is one major strategic challenge for the nuclear community. A way to sharply decrease this volume is to selectively remove the long-lived elements (actinides, {137}Cs, {90}Sr). Hence, a large part of the initial wastes could be directed to a subsurface repository and a very small part containing most of the long-lived radionuclides to be disposed off, after conditioning, in geological formation.
The removal of these long lived elements from high sodium nitrate content acidic liquid wastes needs very selective extractants in order to minimize the volumes of wastes in geological formations. Former projects funded by EC have focused on the removal of {137}Cs and {90}Sr and have proposed 2 functionalised macrocycles presenting extraction properties for selective extractions. The purpose of this project was to find a selective extractant for removal of minor actinides from high activity liquid waste, and specially to separate minor actinides from lanthanides, both having similar chemical properties.

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