[en] This paper reviews the major aspects of the joint program carried out by the Commissariat a l'Energie Atomique, Electricite de France, Framatome and Westinghouse on the investigation of Inconel 690 (I.690) for use as PWR Steam Generator Tubing. The program was conceived as a further step in the long-term development of improvements in S.G. tube material corrosion resistance. Although the major emphasis of the work was on the corrosion resistance it was also necessary, in preparing for the commercial use of I.690 for S.G. tubing, to verify other aspects of behaviour in respect of physical and mechanical properties and for steam generator fabrication purposes. A key activity in the preparation for commercial use was the pre-production fabrication by a tube supplier of about 200 full-length tubes from each of three different heats. These tubes not only served the need to fully characterize the tubing (a requirement of the French specifications) but also provided a source of additional fully representative material for confirmatory corrosion and fabrication evaluation