Creep behavior of U-6%Zr alloy was studied in the temperature range 550-650°C using impression creep technique. Creep curves at 575°C for various stresses are not smooth and curves at 575°C for various stresses are not smooth a sudden penetration of the punch which is followed by decrease in impression depth with time. The punching stress versus creep rare data for the above temperature also show a random behavior. A detailed microstructural investigation was carried out with the help of SEM and EDX to understand this phenomenon. At  creep testing temperature, δ-UZr₂ phase continuously forms and it takes very long time to complete the reaction. Hence, the reason for waviness may be due to the formation of δ-phase coming out from the supersaturated α-phase.