Objective THE INFLUENCE OF THE ORGANIC COMPLEXING AGENTS DBP, TBP, EDTA, CITRATE AND OXALATE ON THE SOLUBILITY, SORPTION BEHAVIOUR AND MIGRATION OF THE ELEMENTS IODINE, CESIUM, URANIUM, NEPTUNIUM, PLUTONIUM AND AMERICIUM HAS BEEN INVESTIGATED IN ORDER TO OBTAIN DATA RELEVANT TO SAFETY ASPECTS OF ILW REPOSITORIES. THESE SYNTHETIC ORGANICS ARE PRODUCTS RESULTING FROM FUEL ELEMENT FABRICATION, SPENT FUEL PROCESSING AND FROM CHEMICAL PROCEDURES PERFORMED IN LABORATORIES. LEACHING EXPERIMENTS ON THE REAL AND SIMULATED ILW FORMS HAVE BEEN PERFORMED FOR COMPARING THEM WITH THOSE DATA, OBTAINED FROM THE COMPOUNDS AFOREMENTIONED. WITHIN THE FRAME OF THIS PROJECT THE MATRICES CEMENT AND BITUMEN USED FOR VITRIFICATION HAVE ALSO BEEN TAKEN INTO CONSIDERATION. The influence of the synthetic organic complexing agents dibutylphosphate, tributylphosphate, ethylenediaminetetraacetic acid, citrate and oxalate on the solubilities, the migration and the sorption behaviour of the elements iodine, caesium, uranium, neptunium, plutonium and americium was investigated in electrolyte solutions which represented the conditions of the near field of a waste repository in a salt dome after an intrusion of brines.B1. SOURCE TERM SOLUBILITY STUDIES. B1.1.DETERMINATION OF EQUILIBRIUM SOLUBILITIES OF PLUTONIUM(IV), AMERICIUM(III) AND NEPTUNIUM(V) HYDROXIDES, SODIUM DIURANATE, CESIUM CHLORIDE, SILVER IOXIDE AND SILVER IODATE IN CONCENTRATED SALT SOLUTIONS UNDER THE INFLUENCE OF THE PRESENCE OF TBP, DBP, EDTA, CITRATE AND OXALATE. B1.2. DETERMINATION OF THE TENDENCY TOWARDS COLLOID FORMATION BY MEANS OF ULTRAFILTRATIONS. B1.3. DETERMINATION OF RADIONUCLIDE LEACHABILITY FROM CONDITIONED ILW IN CONCENTRATED SALT SOLUTIONS IN THE PRESENCE OF ORGANICS MENTIONED ABOVE. B1.4. DETERMINATION OF THE TENDENCY TOWARDS COLLOID FORMATION OF RADIONUCLIDES IN WASTE LEACHATES BY MEANS OF ULTRAFILTRATION. B1.5. SOLIDIFICATION OF SELECTED ORGANICS IN CEMENT AND DETERMINATION OF THEIR LEACHABILITIES. B1.6. FOR SELECTED ACTINIDES ONLY : SOLIDIFICATION OF COMPLEXED ACTINIDES IN CEMENT AND DETERMINATION OF THEIR LEACHABILITIES. B2. SORPTION AND MIGRATION IN THE NEAR-FIELD. B2.1. DETERMINATION OF MOBILITY AND SORPTION PROPERTIES OF RADIONUCLIDES DERIVED FROM B1.1. AND B1.6. THROUGH COLUMNS FILLED WITH CRUSHED SODIUM CHLORIDE AND SITE-SPECIFIC ROCK SALT. B2.2. DETERMINATION OF MOBILITY AND SORPTION PROPERTIES OF RADIONUCLIDES IN WASTE LEACHATES DERIVED FROM B1.3. BY THE USE OF SALT COLUMNS. B2.3. DETERMINATION OF THE SORPTION BEHAVIOUR OF SELECTED RADIONUCLIDE SYSTEMS UPON SALT BY THE USE OF BATCHTYPE EXPERIMENTS. Fields of science natural scienceschemical sciencesinorganic chemistryalkali metalsnatural scienceschemical sciencesinorganic chemistrytransition metalsnatural scienceschemical sciencesinorganic chemistryhalogensengineering and technologyenvironmental engineeringenergy and fuelsnatural scienceschemical sciencesnuclear chemistryradiation chemistry Programme(s) FP1-RADWASTOM 3C - Research and development programme (Euratom) on the management and storage of radioactive waste, 1985-1989 Topic(s) Data not available Call for proposal Data not available Funding Scheme CSC - Cost-sharing contracts Coordinator FREIE UNIVERSITAET BERLIN EU contribution No data Address Kaiserswertherstrasse 16-18 BERLIN Germany See on map Links Website Opens in new window Total cost No data
