ASSYSTEM is an independent nuclear engineering company providing engineering, project management and digital services across the nuclear lifecycle and low-carbon energy sectors in 13 countries.
ASSYSTEM is one of the world's leading independent nuclear engineering companies, founded in 1966 and ranked among the top three nuclear engineering firms worldwide. The company provides engineering, project management and digital services across the nuclear lifecycle, spanning new builds, advanced reactor technologies, operations, maintenance and decommissioning engineering. It participates in every major EPR (European Pressurized Reactor) construction project globally and works with major industrial groups including EDF, Framatome, ITER, Rolls Royce and Naval Group.
Employing 8,000 people across 13 countries in Europe, Asia, Africa and the Middle East, ASSYSTEM operates in highly regulated, safety-critical sectors where engineering discipline, quality assurance and adherence to nuclear and industrial standards are central to delivery. Its project management services are directed at infrastructure programmes that meet requirements for safety, competitiveness and environmental performance, and its digital transformation capabilities combine software and data services with deep engineering expertise.
Beyond nuclear energy, the company's technical domains include renewable energy engineering, hydrogen, power grids and transportation engineering, as well as defence and naval work through its partnership with Naval Group. The firm describes its mission as accelerating the energy transition and combating climate change, and has been engaged in nuclear innovation for nearly 60 years.
