The use of zirconium was developed to solve some problems of severe corrosion in boiling nitric medium, and to guarantee the service life of the equipment concerned. The paper presents the experience gained since the early 1970s, when the first units made of zirconium were used in French reprocessing plants. For the new La Hague UP3 and UP2 800 plants, it was decided to extend the use of zirconium to make large-scale equipment and, to do so, a major R and D program was implemented, of which the main results are presented.
Decours, J; Demay, R;  Bernard, C; Mouroux, J P;  Simonnet, J 
- CEA Centre d`Etudes Nucleaires de Fontenay-aux-Roses, 92 (FR)
- Societe Generale pour les Techniques Nouvelles (SGN), 78 - Saint-Quentin-en-Yvelines (FR)
- Compagnie Generale des Matieres Nucleaires (COGEMA), 78 - Velizy-Villacoublay (FR)