Walter AMBROSINI is Full Professor in Nuclear Plants at the University of Pisa, Italy. His Research interests involve the field of Nuclear Reactor Thermal-hydraulics: Heat and mass transfer, System code use and development for safety analyses of nuclear reactors, Flow stability, Heat transfer to fluids at supercritical pressure, CFD and numerical modelling of thermal-hydraulic systems. His teaching activities include: Computational Thermal Fluid-dynamics, Single and two-phase thermal-hydraulics, Numerical methods for nuclear reactors, Nuclear Safety. He has been President of the Research Doctorate in Nuclear Engineering in Pisa (2008-2016), President of the MSc in Nuclear Engineering in Pisa (2011-2018), President of the European Nuclear Education Network (2013-2016), Member of the ASN Commission for Energetics and Nuclear Engineering (2018-2021), Present Member of the CDs of CIRTEN and of the Associazione Italiana Nucleare (AIN). His relevant Memberships: AIN, ENS, ANS, ASME.