Mr. Hiroyuki Ohshima is an executive board director of Japan Atomic Energy Agency. As a researcher, he has more than 30 years of experience in research and development related to thermal-hydraulic issues and safety specific to sodium-cooled fast reactors after graduating from the University of Tokyo Graduate School. He also has been committed to the JSME and AESJ activities; he is a past chair of the planning committee of Power and Energy Systems Division of JSME and currently he is the chair of subcommittee on thermal hydraulics of AESJ. He is a fellow of JSME.