EDF is currently designing an optimised version of the EPR: the EPR2, which is easier to build and therefore more competitive. To achieve this goal, the project relies on many digital tools, making EPR2 the first "full digital" reactor. The teams initially designed the EPR2 via a 3D digital twin, before "fast forwarding it through time" using 4D. Thanks to digital technology, engineers can now visualise the stages of construction in advance to prevent potential pitfalls on the site, share reliable data in real time with industrial partners, and even check the feasibility of future operation and maintenance activities, in the best possible conditions. These innovations position the French nuclear industry at the cutting edge of technology.