Paul Scherrer Institute

The Paul Scherrer Institute, PSI, is the largest research centre for natural and engineering sciences within Switzerland. We perform world-class research in three main subject areas: Matter and Material; Energy and the Environment; and Human Health. By conducting fundamental and applied research, we work on long-term solutions for major challenges facing society, industry and science.
With respect to nuclear energy, Department of nuclear energy and safety (NES) at PSI has a unique position in Switzerland. This is due to its heavy infrastructure, namely the Hot Laboratory with so-called ‘hot cells’, well equipped and shielded zones for work and research on radioactive material. In addition, the NES takes advantage of PSI’s large facilities, the Synchrotron Radiation Source (SLS) and the Spallation Neutron Source (SINQ).
Based on this infrastructure and the know-how of its collaborators the Department is involved in three main topics of research: Safety of currently operating light-water reactors, safety characteristics of future reactor concepts and related fuel cycles, and long-term safety of deep geological repositories for nuclear wastes of all kind. The work is being done on behalf of the Federal Government and in close cooperation with the Swiss nuclear utilities, the national waste management organisation, Nagra, and the national regulatory authority, ENSI. It also includes scientific services for the nuclear power plants. Most of the research is connected with international projects on a multi- or bi-national cooperation basis.

Role in the project

Within SOTERIA, PSI together with CEMHTI/CNRS is in charge of experimental work of “The Effects of Helium on IASCC Susceptibility” in WP4. In WP5, PSI will develop Kinetic Monte Carlo models and methods aiming at the study of the formation and evolution of irradiation-induced nanofeatures in RPV steels.

Personnel involved

Dr. Jiachao Chen, Senior scientist
He is a specialist in irradiation damage on mechanical and microstructural properties. He has accumulated 20 years’ experience on irradiation effects at Forschungszentrum Juelich (in Germany) and Paul Scherrer Institute. He has been working in study of effects of He-implantation on microstructure and embrittlement of materials including ceramics (SiC etc.); austenitic and martensitic/ferritic stainless steels; INCONEL super alloys and refractory metals. The characterisation methods included mainly miniaturised and standard mechanical tests, and microstructural analysis by TEM and SEM observation. Since 2003 he has joined in ANM group at PSI and engaged mainly on thermal and irradiation creep of intermetallic alloy, ferritic steels and their ODS version.
Jiachao Chen
Raoul Ngayam-Happy (PSI)
Currently working as a research collaborator in the Laboratory for Reactor Physics and Systems Behaviour (LRS) of the Nuclear Energy and Safety (NES) department on various projects related to multiscale modelling of nuclear fuels and RPV materials. He received his engineering degree in 2007 at the “Institut supérieur des matériaux et mécanique avancés du Mans”. He obtained a PhD in 2010 from the University of Sciences and Technology of Lille, while working in the Department of Materials and Mechanics at EDF R&D. In that frame, he has been involved in FP-6 PERFECT and FP-7 PERFORM-60 projects. In the latter, he has mainly worked in SP1 WP1-3 on the development of Lattice Kinetic Monte Carlo methods to model the evolution of the microstructure under irradiation of complex ferritic steels representative of RPV materials.
Raoul Ngayam-Happy

Available Documentation

Coming soon