[en] Bouygues-TP builds the nuclear island of the EPR on the Olkiluoto site as a subcontractor of Areva and is in charge of all the civil work of the EPR on the Flamanville site. These works sites are featured by: -) an important staff about 1300 staff work on each site which implies a very efficient organization, -) the exiguity of the place to store materials and equipment (cranes), -) the huge work of weaving concrete reinforcement bars, -) the concrete structures are spread with countless inserts that must be accurately positioned. Buildings classified as nuclear must be built under strict standards and have to undergo regular checking for conformity by nuclear safety authorities. The feedback experience cumulated during the construction concerning specifications, calculation methods and the management of various professional bodies intervening on the site, will be used to propose improvements and pave the way for future EPRs. This series of slides present also photographs of the works at different times of the construction. (A.C.)