Out and in pile diffusion experiments between U-Mo alloys and Al-Si alloys: Work status

U-Mo alloys in γ-phase were considered good candidates to fulfil the conversion of research and production reactors to LEU. Important porosity developed at the interface between the interaction layer between UMo and Al matrix , leading to catastrophic break-through. Out.of.pile chemical diffusion experiments are performed to understand this problem. New results done with Al 6061 (0.6wt% Si) at 5500C and 3400C are presented. Other results previously reported at these temperatures for Al alloys containing 0.6 wt% to 7.1 wt% Si are summarized and discussed in this work. In pile experiments are under course in RA3 reactor in Argentine. (author)