Obiettivo
THE APPARENT RADIONUCLIDE SOLUBILITIES IN GROUNDWATER MAY BE ENHANCED BY THEIR ASSOCIATION WITH COLLOIDS, SO THAT A REALISTIC MODEL FOR THE RETENTION OF ACTINIDES BY A RADIOACTIVE WASTE REPOSITORY REQUIRES THE KNOWLEDGE OF THE RADIONUCLIDE LOADING OF THE GEOCOLLOIDS AS WELL AS THE EXTENT OF THEIR TRANSPORT THROUGH THE GEOSPHERE. ULTRAFILTRATION TECHNIQUES HAVE BEEN DEVELOPED TO COLLECT GROUNDWATER SAMPLES IN THE FIELD, AND THEIR COMPONENT PHASES, PARTICULATE, COLLOID AND AQUEOUS SOLUTION PHASES. THE RESEARCH DESCRIBED HEREAFTER IS CONCERNED WITH URANIUM STUDIES OF NATURAL COLLOIDS DESIGNED TO QUANTIFY THE EFFECTS OF ACTINIDE/COLLOID ASSOCIATION ON THE PAST AND FUTURE MIGRATION OF RADIONUCLIDES AT GORLEBEN (FRG) AND EL BERROCAL (SPAIN).
THE AIMS ARE AS FOLLOWS:
- TO SAMPLE NATURAL COLLOIDS FROM SEVERAL BOREHOLES AT THE ABOVE SITES IN COLLABORATION WITH TECHNICAL UNIVERSITY, MUNICH AND ENRESA/CIEMAT STAFF.
- TO CHARACTERIZE PARTICULATE, COLLOID AND SOLUTE PHASES IN TERMS OF THEIR PHYSICAL, CHEMICAL AND ACTINIDE COMPOSITION.
- TO USE ARTIFICIAL COLLOIDS LABELLED BY ARTIFICIAL RADIONUCLIDES TO STUDY IN GREATER DETAIL THE UPTAKE CHARACTERISTICS OF THE ULTRAFILTERING SYSTEM USED.
1. SAMPLING AND CHARACTERISATION OF GORLEBEN GROUNDWATER IN TERMS OF ACTINIDE INVENTORY AND PHYSICAL, CHEMICAL CHARACTERISATION OF GEOCOLLOIDS, WITH INTERCOMPARISON EXERCISE (HARWELL/TUM)
2. STUDY OF COLLOID UPTAKE ON TANGENTIAL FLOW ULTRAFILTERS USING MODEL COLLOIDS.
3. CHARACTERISATION OF EL BERROCAL GROUNDWATER IN TERMS OF ACTINIDE INVENTORY AND PHYSICAL, CHEMICAL CHARACTERISATION OF GEOCOLLOIDS.
4. ACTIVE PARTICIPATION IN COCO CLUB BOTH IN TERMS OF DEFINING FUTURE ACTIONS AND CARRYING OUT FUTURE BENCHMARK EXERCISES.
Campo scientifico
Argomento(i)
Data not availableInvito a presentare proposte
Data not availableMeccanismo di finanziamento
CSC - Cost-sharing contractsCoordinatore
OX11 0RA Didcot - Oxfordshire
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