Our Directors

Management Team


David Boyes (Managing Director - STL Nuclear)

David Boyes completed his Baccalaureus Technologiae in Metallurgical Engineering and has over 30 years of nuclear fuel process development and fuel manufacturing experience. David started work at the then Atomic Energy Corporation where he developed uranium dioxide pellet fuel for Koeberg Nuclear Power station. This involved the research and development of the powder metallurgical route to fabricate fuel on an industrial scale for Koeberg. He then became Production Manager of the uranium powder production plant and the uranium chemical recovery plant at the Nuclear Energy Corporation of SA. He then joined PBMR and produced the first uranium dioxide kernels for pebble fuel. He was responsible for all the uranium process facilities needed for the manufacture of pebble fuel at PBMR.

He now serves as managing director on the STL board overseeing the engineering design of a HTMR -100 reactor and is responsible for the development and supply of qualified pebble fuel for the reactor.


Prof. Johan Slabber (Chief Technology Officer (CTO) - STL Nuclear)

Professor Johan Slabber is currently working in the Department of Mechanical and Aeronautical Engineering at the University of Pretoria where he is appointed to represent the University in all formal communications with the Director of the Centre for Nuclear Safety and Security (CNSS) of the National Nuclear Regulator (NNR). He is also involved in teaching and research in the field of Nuclear Engineering at both undergraduate and post-graduate levels. Before joining the University he was the Chief Technology Officer at the company PBMR (Pty) Ltd.

In his earlier career he held the positions of General Manager, Reactor Technology at the Atomic Energy Corporation of South Africa (now Necsa), Chief Systems Engineer at the company Integrators of Systems Technology (IST) where he led a small team which completed the first conceptual systems design of a small Demonstration High Temperature Reactor. In 1994 he joined the Safeguards Department of the International Atomic Energy Agency (IAEA) in Vienna where he completed a contract period of 5 years before joining the company PBMR (Pty) Ltd in 1999.

He is a former member of the International Nuclear Safety Group (INSAG) of the IAEA and is currently the South African representative on the Senior Industry Advisory Panel (SIAP) of the Generation IV Industrial Forum (GIF) as well as a member of the Collaborative Research Group on Accident Tolerant Fuel (CARAT).

He holds a Doctorate in Mechanical Engineering from the University of Pretoria and also studied at the Oak Ridge School of Reactor Technology in the United States.

Latest News

Developed and Maintained by Crystal Claw Studios (Pty) Ltd