JRP CALL information
Supported By

European Commission

Short description of the work
In order to predict the helium behaviour under disposal condition, the mechanisms of helium diffusion, solubility and bubble nucleation in the glass have to be investigated. In this Talisman project, helium bubble nucleation and growth mechanisms were studied in 244Cm doped glass samples. The glass doping technique induces a homogeneous irradiation of all the glass volume, summing the two components of the alpha disintegration: recoil nuclei and alpha particles.
A SON68 glass doped with 1.2 wt.% 244Cm was prepared in 2001 in the Atalante facility of CEA Marcoule. After 14 years of storage corresponding to a dose of about 9.7×1018 α.g-1, isothermal annealing were performed at 693, 823, 923 K. SEM observations of glass surface (original and fractured) were performed after each thermal treatment. Moreover, after crushing, glass powders were also studied by TEM with a special modified FEI Tecnai G2 F20 XT. We analyzed the glass before and after annealing.
After storage at room temperature during 14 years, the glass microstructure is homogeneous, without any He bubbles. He bubbles could only be observed by SEM and TEM after annealing of the glass at temperature higher than the glass vitreous temperature. These helium bubble formation conditions are then far from the conditions of glass storage.

Main visitor contact data
Name: Sylvain Peuget
Organisation: CEA

JRP Identification
JRP nr: TALI-C02-14
JRP title: High minor actinides loading factor in nuclear glass: helium solubility and mechanisms of helium bubble  nucleation 
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: Philippe Raison

Other APF and organisation involved in the JRP
Other organisations involved:
Other APF involved in the project:

Description of the work done at the associated pooled facility
Start date of the stay: 1/22/2015
End date of the stay: 1/23/2015
Quantity of access: 2
Access Unit: Days

Other APF visitors of the JRP during the stay
Visitor 2: Gutierrez Gaelle