JRP CALL information
Supported By

European Commission

Short description of the work
Heavy ion irradiation of U-Mo/Al fuel simulates in-pile irradiation; the interdiffusion layer (IDL) found after both kind of irradiations is similar in composition and microstructure. This similarity implies that the major contribution to the diffusion reaction comes from collisions of fission fragments. Based on this finding, studying the heavy ion induced diffusion behaviour will lead us to the diffusion mechanism of U-Mo/Al fuel. Atomic mixing at interfaces after irradiation is observed. This atomic mixing implies either the formation of solid solutions or of irradiation-induced new phases at the interfaces. Several parameters have been used in this study to provide overall understandings: U-Mo thickness, different protection layers and irradiation temperature. Different thickness of U-Mo layer induces different ion beam energy at interfaces. Application of different irradiation temperatures gives different amount of thermal energy contribution to the diffusion reaction. Up to now we have investigated the ion beam mixing effect (IBM) induced by heavy ion irradiation by means of SEM, EDX and RBS. Further understanding of the diffusion mechanism of U-Mo/Al fuels is currently limited by the resolution of these methods. First TEM measurements have indicated that “better” information can be gained by TEM. TEM measurements are able to clarify the compositions of intermixing. Selected area diffraction pattern (SADP) provide precise phase identifications and crystal structures. For instance it is important to know whether the IDL is amorphous or crystalline. Nano-EDX line-scan will be able to provide the elemental distributions across the interfaces. This line-scan can clarify the possible ion beam mixing model which cannot be achieved with limited resolution. The information at interfaces is important to evaluate the stability of the diffusion barrier and the adequacy.

Main visitor contact data
Name: Dr. Hsin-Yin Chiang
Organisation: FRM II, Technische Universität München

JRP Identification
JRP nr: TALI-C01-16
JRP title: Studies of diffusion reactions of U-Mo/Al fuels under heavy ion irradiations: out-of-pile simulations
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: Hsin-Yin Chiang

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: 3/24/2014
End date of the stay: 7/11/2014
Quantity of access: 20
Access Unit: Days