Objective
IN THE FRAME OF THE TWO PRECEDING EUROPEAN JOINT PROGRAMS ON TESTING AND EVALUATION OF THE PROPERTIES OF VARIOUS POTENTIAL MATERIALS FOR IMMOBILIZING HIGHLY RADIOACTIVE WASTE STARTING IN 1975 A LOT OF DATA ON THE CHARACTERIZATION OF SIMULATED SOLIDIFIED HIGH LEVEL WASTE FORMS HAS BEEN ACQUIRED. THERMAL, MECHANICAL AND RADIATION STABILITY AND THE CHEMICAL STABILITY UNDER THE ATTACK BY VARIOUS AQUEOUS MEDIA WERE TESTED. THE EXPERIMENTS HAVE BEEN PERFORMED UNDER WASTE REPOSITORY RELEVANT CONDITIONS AND UNDER SIMPLIFIED LABORATORY CONDITIONS SELECTED TO INVESTIGATE THE CORROSION MECHANISM. IN THE PRESENT RESEARCH PROGRAM THE FULLY RADIOACTIVE COGEMA GLASS R7T7 PROPOSED AS A REFERENCE GLASS WILL BE INVESTIGATED IN THE HOT CELL FACILITY. THE RESULTS WILL BE COMPARED WITH THOSE OBTAINED FOR NON RADIOACTIVE GLASS SAMPLES IN ORDER TO FIND OUT WHETHER THERE ARE SIGNIFICANT DIFFERENCES DUE TO RADIATION AND - OR DIFFERENT WAY OF GLASS MANUFACTURING.
DUE TO A DELAY IN THE MELTING OF THE HIGHLY RADIOACTIVE GLASS, THE EXPERIMENTS COULD NOT BE STARTED. THEREFORE, A SHORT TERM POST-INVESTIGATION OF THE HIGHLY RADIACTIVE GLASS FROM THE PAMELA PLANT HAS BEEN PROPOSED. THE AIM IS A CHECK-UP OF THE ACTIVE LEWC GLASS SM513LW11.
A short term postinvestigation of the highly radioactive glass from the PAMELA plant in Mol, Belgium has been carried out. The active LEWC glass SM 513 LW11 was investigated and the results were compared with those obtained for nonradioactive glass samples.
A large amount of data has been acquired on the characterization of simulated solidified high level waste forms. Thermal, mechanical and radiation stability and the chemical stability under attack by various aqueous media were tested. The experiments were performed under relevant waste repository conditions and under simplified laboratory conditions selected to investigate the corrosion mechanism.
Results showed that the interaction between the high level waste (HLW) glasses and salt brines led to the formation of surface layers with different chemical compositions. It has been shown that the various surface layers control the corrosion mechanism and influence greatly the kinetics of the leaching processes. The chemical composition of the layers depends upon the composition of the glasses as well as upon the composition of the salt brines.
1. HAW GLASS R7T7 OR SON68.18.17.L1C2A2Z1 WILL BE PRODUCED IN VALRHO, FRANCE, SENT TO THE CONTRACTANTS WITH NOMINAL COMPOSITION AND PRODUCTION CONDITIONS.
2. PREPARATION OF IMBEDDED, POLISHED SAMPLES FOR INVESTIGATIONS LISTED UNDER 3.1 3.2 AND 4.
3. QUALITY CONTROL OUTSIDE THE HOT CELLS.
3.1 CHEMICAL COMPOSITION OF THE BULK GLASS BY EPMA MEASUREMENTS AND COMPARISON WITH NOMINAL COMPOSITION.
3.2 INVESTIGATION OF HOMOGENEITY OF THE GLASS AND UNSOLUBLE PHASES IN THE GLASS MELT BY EPMA AND SEM.
4. CRYSTALLYZATION AND DEVITRIFICATION AT THE TEMPERATURE OF MAXIMUM CRYSTALLIZATION VELOCITY.
5. LEACHING EXPERIMENTS
5.1 PREPARATION OF SAMPLES: CHIPS AND POSSIBLY POWDER.
5.2 EXPERIMENTS IN AUTOCLAVES BETWEEN 110 AND 190 CELSIUS DEGREES IN SATURATED SALT BRINES.
5.3 SHORT- AND LONG-TERM LEACHING EXPERIMENTS, I.E. BETWEEN < OR = 30 D AND ~ 1000 D.
6. ANALYSIS OF THE LEACHATES BY ICP ATOMIC EMISSION SPECTROSCOPY.
7. INVESTIGATION OF HAW GLASS AFTER LEACHING.
7.1 MASS LOSS MEASUREMENTS OF LEACHED GLASS SAMPLES.
7.2 SEM AND EPMA INVESTIGATION OF THE SURFACE LAYERS AND IDENTIFICATION OF CRYSTALLINE PHASES.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology other engineering and technologies nuclear engineering nuclear waste management
- natural sciences physical sciences optics spectroscopy emission spectroscopy
- engineering and technology materials engineering amorphous solids
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Coordinator
14109 BERLIN
Germany
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