GRAIN REFINING OF URANIUM BY LOW ADDITIONS AND THERMAL TREATMENT

The effect of heat treatment on the grain size of uranium alloys with Cr, Si, Mo, Al, Ni, Fe, and Zr was investigated. The alloying element had a concentration equal to or less than 0.1% by weight. The TTT diagrams already published are used in the study, and the TTT diagram for U-0.08% Si was determined. The results obtained with fuel elements of different sizes are described. (tr-auth)