JRP CALL information
Supported By

European Commission

Short description of the work
In the context of studies concerning the long term behaviour of nuclear glasses and in order to understand the influence of radioactivity on the glass leaching especially on the residual rate step, two different R7T7-type borosilicate glasses with a different alpha dose rate were leached in the shielded line C19 in ATALANTE facility. Solution analyses showed a drop in the alteration tracer releases indicating the formation of a protective alteration layer at the solid - solution interface. The current project objective was to better understand the nature and the morphology of this protective alteration layer formed on the radioactive glass surfaces, particularly concerning the behaviour of radionucleides, by analysing radioactive glass powders previously leached by transmission electron microscopy and secondary electron microscopy.
The two different samples of altered doped glasses have been sent to ITU for solid characterizations. The TEM grids have been prepared by grounding the glass powders into very thin fractions. For both glasses, we were able to observe the different parts of the alteration layers by TEM: alteration gel and phyllosilicates. Their quantities were different from one glass to the other one. Some black "grains" have also been observed on the most doped sample leached, and seem to be enriched in rare earth elements. Some complementary TEM and SEM characterizations are now needed to complete these observations

Main visitor contact data
Name: Dr Magaly TRIBET
Organisation: CEA

JRP Identification
JRP nr: TALI-C06-13
JRP title: Effect of the alpha radioactivity on glass leaching behavior: solid caracterisations of the altered layer
JRP scope: Scope 3: Actinide materials

Visited Associated Pooled Facility
Visited APF during the stay: JRC-ITU - Labs & Hot-cells
Name of the APF Contact Person: Dr Thierry WISS

Other APF and organisation involved in the JRP
Other organisations involved:
Other APF involved in the project: CEA - ATALANTE

Description of the work done at the associated pooled facility
Start date of the stay: 12/7/2015
End date of the stay: 12/11/2015
Quantity of access: 10
Access Unit: Days

Other APF visitors of the JRP during the stay
Visitor 2: Sarah MOUGNAUD