A TEST FOR THE STUDY OF THE RELEASE OF VARIOUS ELEMENTS FROM HLW GLASSES IN CONTACT WITH POROUS MEDIA
When a borosilicate glass incorporating HLW is embedded in a static porous media the leached elements diffuse into the media. The release of the various elements from the glass is governed by different mechanisms. Soluble elements (such as Cs or Tc) will be released as a direct consequence of the glass degradation. The release of elements which are less soluble than silica, on the contrary, will be dominated by the solubility limit and by the subsequent diffusion in the porous media. Diffusion in the porous media will also depend upon the absorption capacity of the material for the various species. In order to evaluate the importance of the various mechanisms and their mutual interaction, an integral experiment has been devised which allows at the same time to measure the leaching rate and the diffusion of the various species in the porous media. In such experiment a column of a wet porous material is pressed in a tight system against a sample of the glass under examination. The system is then put in a thermostatized air furnace for the desired time. Afterwards the system is dismounted in order to recover the glass sample.
Bibliographic Reference: WORKSHOP ON THE SOURCE TERM FOR RADIONUCLIDE MIGRATION FROM HIGH-LEVEL WASTE OR SPENT NUCLEAR FUEL UNDER REALISTIC REPOSITORY CONDITIONS, ALBUQUERQUE, NEW MEXICO (USA), NOV. 13-15, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 3176
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Record Number: 1989123036900 / Last updated on: 1987-01-01
Available languages: en