Sixth International Conference on Geological Repositories (ICGR-6): Advancing Geological Repositories from Concept to Operation


Hiroyuki Umeki

Nuclear Waste Management Organization of Japan (NUMO)

Executive Director

Job title

Executive Director


Dr. Hiroyuki Umeki is an executive director of Nuclear Waste Management Organization of Japan (NUMO) and responsible for overall technical activities on geological disposal of HLW and long-lived intermediate-level waste, including knowledge management project to support geological disposal programmes. During his over 30 years work in radioactive waste management, he was strongly involved in the projects for feasibility study on HLW geological disposal in Japan and documented two projects reports; H3 and H12. During 1993-1994 he was a guest researcher at Nagra in Switzerland and participated in the Kristalin-I Project. Dr. Umeki has been intensively involved in international groups, particularly associated with the OECD/Nuclear Energy Agency (NEA). From November 2004 to October 2009, he was the chair of NEA Integration Group for the Safety Case (IGSC) and, is the chair of NEA Radioactive Waste Management Committee (RWMC), from 2019.

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