JRP CALL information
Supported By

European Commission

Short description of the work

In the event case of a clad breach in a Sodium-cooled Fast Reactor (SFR), sodium will enter the pin and react with the (U1-xPux)O2 fuel to form compounds of general formula Na3U1-xPuxO4. One main goal of the International Generation IV program is moreover to incorporate minor actinides (Np,Am) to the fuel so as to recycle them and reduce the burden for future generations. This will introduce a more complex chemistry with sodium, for which many data are missing. As part of our program of research, we are currrently investigating the structural, thermomechanical and thermodynamic properties of the numerous compounds in the Na-Np-O, Na-Pu-O systems and Na-(U,Pu)-O systems: Na2MO3, Na3MO4, Na2MO4, Na4MO5, Na2M2O7, Na5MO6 (M=U,Pu,Np). The later compounds present many oxidation states, namely IV, V, VI and VII, which define the oxygen potential required for their formation. In the present work, we have characterized those different oxidation states, and local structures of the uranium, neptunium, and plutonium cations using X-ray Absorption Structure (XAS) at the HZDR Rossendorf Beamline (ROBL). Such a study is of primary importance for the thermodynamic modeling of the system for SFRs, which is the ultimate goal of our research.

Main visitor contact data
Name: Anna Smith
Organisation: Institute for Transuranium Elements

JRP Identification
JRP nr: TALI-C03-12
JRP title: XAFS studies of sodium nepunates, plutonates, and uranoplutnoates
JRP scope: Scope 3: Actinide materials

Visited Associated Pooled Facility
Visited APF during the stay: HZDR - ROBL
Name of the APF Contact Person: Andreas Scheinost

Other APF and organisation involved in the JRP
Other organisations involved: University of Cambridge, Department of Materials Science and Metallurgy
Other APF involved in the project: JRC-ITU - Labs & Hot-cells

Description of the work done at the associated pooled facility
Start date of the stay: 10/21/2014
End date of the stay: 10/24/2014
Quantity of access: 3
Access Unit: Days