Dr. Tamás János KATONA, Professor Emeritus at the Faculty of Engineering and Information Technology of the University of Pécs and Chief Technical Expert at MVM Nuclear Power Plant Paks Ltd, has 50 years of experience in the design and safety of nuclear power plants. From 1973 to 1983 he worked at the Central Research Institute for Physics, Budapest, Hungary. Dr. Katona was involved in the preparation and execution of the start-up tests at the first-in-the-country reactor of Paks NPP. Since 1983, he has been working in different leading positions in the technical support area at MVM Nuclear Power Plant Paks Ltd. He is the leader of site seismic re-evaluation and seismic upgrading of Paks NPP, a leading expert in the implementation of post-Fukushima measures related to the external hazards, and responsible for the preparation and implementation of site evaluation, safety analysis, and design reviews for newly built projects. Recently, he has participated in the scientific-technical preparation of the subsequent licence renewal of Paks NPP. Dr. Katona has participated in International Atomic Energy Agency research programs on seismic safety, external and internal hazards, and plant ageing management. He is a contributing author of several International Atomic Energy Agency documents. He participated in several review missions in Syria, Iran, Pakistan, Armenia, Bulgaria, and Ukraine, among others. Dr Katona is the author of 252 papers, book chapters, and conference papers.