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CHARACTERIZATION OF ACTINIDES, COMPLEXES AND COLLOID MIGRATION IN GRANITE (EL BERROCAL)

Objective

THE OBJECTIVE OF THE STUDY IS TO CHARACTERIZE THE MIGRATION PROCESSES IN A FISSURED GRANITIC FORMATION BY MEANS OF IN SITU AND COMPARATIVE LABORATORY EXPERIMENTS.
THE STUDIES WILL BE CONDUCTED AT EL BERROCAL URANIUM MINE, LOCATED IN A GRANITIC BATHOLITH OF THE "SISTEMA CENTRAL" OF SPAIN.
AFTER AN EXTENSIVE CHARACTERISATION OF THE EL BERROCAL BATHOLITH, THE NATURAL MIGRATION PROCESSES OF URANIUM FROM THE INTERGRANITIC URANIFEROUS VEINS AND ITS DESINTEGRATION PRODUCTS WILL BE STUDIED BY SAMPLING AND ANALYSING THE NATURAL COLLOIDS AND THE GROUNDWATERS. THE OBJECTIVES OF THIS PHASE ARE TO CLARIFY THE MIGRATION PROCESSES WHICH HAVE NATURALLY OCCURRED, AS WELL AS THE SYSTEM EXPLANATORY MODEL, SO THAT THE SENSIBILITY OF ALL DIFFERENT PARAMETERS INVOLVED IN THE RADIONUCLIDES TRANSPORT CAN BE ELUCIDATED.
GRANITE AND FISSURE MATERIAL SAMPLES WILL BE USED IN LABORATORY COLUMNS, UNDER OXIC AND ANOXIC CONDITIONS, TO INVESTIGATE THE MIGRATION OF URANIUM IN FISSURES AND ITS DIFFUSION THROUGH THE ROCK MATRIX. THE RESULTS WILL BE COMPARED WITH THOSE OF THE IN SITU OBSERVATIONS.
IN PARALLEL WITH THE NATURAL MIGRATION STUDIES IN THE BERROCAL, STABILITY COMPLEXES AND COLLOIDS ANALYSIS WILL BE DEVELOPED WITH NATURAL URANIUM-HUMIC ACID COMPLEXES OBTAINED FROM URANIFEROUS LIGNITES.

CHARACTERIZATION OF THE BERROCAL GRANITIC BATHOLITH: FULL GEOLOGICAL CHARACTERIZATION; SAMPLING FROM BOREHOLES, GALLERIES AND MINERALIZED FISSURES; PHYSICAL PARAMETER AND NATURAL RADIONUCLIDE ANALYSIS AND MINERALOGICAL AND GEOCHEMICAL CHARACTERIZATION.
2. CHARACTERIZATION OF THE LIQUID AND COLLOIDAL ENVIRONMENT: SAMPLING AND ANALYSIS FOR IONIC AND COLLOIDAL PHASE (FILTRATION, DYALISIS, SIZE DISTRIBUTION AND IN SITU MEASUREMENTS OF THE PHYSICO-CHEMICAL PARAMETERS.
3. STABILITY ANALYSIS OF ACTINIDE HUMIC ACID COLLOIDS AND COMPLEXES: ISOLATION AND CHARACTERIZATION OF URANIUM HUMIC ACIDS OF OTHER SPANISH SITES, DETAILED CHARACTERIZATION AND STABILITY ANALYSIS.
4. LABORATORY MIGRATION EXPERIMENTS: DEVELOPMENT OF COLUMN MIGRATION APPARATUS, WITH PRELIMINARY EXPERIMENTATION, MIGRATION EXPERIMENTS IN OXIC AND ANOXIC CONDITIONS IN ROCK MATRIX AND FISSURES IN SEVERAL PHYSICO-CHEMICAL CONDITIONS.
5. DATA ANLYSIS USING CONVENTIONAL MODELS FOR CHEMICAL EQUILIBRIUM AND TRANSPORT, TO COMPARE LABORATORY AND IN SITU MIGRATION RESULTS.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

EMPRESA NACIONAL DE RESIDUOS RADIOACTIVOS S.A.
Address
7,Emilio Vargas 7
28043 Madrid
Spain

Participants (1)

Ciemat
Italy
Address

21027 Ispra