September 18, 2020: PhD public defense – Daniele Salvato – The influence of fission products on the microstructural evolution of UMo based fuel systems – (nano)bubbles, interaction layers and recrystallization - UGent

Name: Daniele Salvato

Date: September 18, 2020 16:00 h

Venue:
SCK CEN Lakehouse (and via broadcast online)
(auditorium)
Boeretang 201
2400 Mol

The influence of fission products on the microstructural evolution of UMo based fuel systems – (nano)bubbles, interaction layers and recrystallization

An alloy of uranium and molybdenum (UMo) has been considered for the conversion of the driver fuel of high power research reactors from high enriched uranium (HEU) to low enriched uranium (LEU). One of the fuel plate designs currently under consideration consists of UMo particles dispersed in a matrix of aluminium.

This PhD research project investigated three specific irradiation induced phenomena that affect the fuel microstructure during irradiation and have an impact on the fuel plate swelling: the fission gas nanobubble lattice developing at low burnups, the fuel restructuring and the nucleation of larger fission gas bubbles triggered at high burnups and, finally, the interaction between the UMo particles and the Al matrix in which they are dispersed. 

The availability of a systematic series of UMo specimens which were irradiated under well-defined conditions, the use of advanced electron microscopy and other analytical techniques, and the results of complementary ion irradiation experiments contributed to the comprehension of the mechanisms driving the UMo behaviour under irradiation


 

Promotor:

  • Christophe Detavernier (UGent)

SCK CEN mentors:
  • Sven Van den Berghe (SCK CEN)

Click here for a list of obtained PhD degrees.