  Classical novae eject significant amounts of matter into the interstellar
medium, as a result of thermonuclear runaways. Nucleosynthesis associated with
nova outbursts includes products from explosive H burning, such as 17O, 15N and
13C, and also radioactive species like 7Be, 22Na and 26Al. In this paper we
report on new hydrodynamic calculations of nova outbursts, from the onset of
accretion to mass ejection. We stress the role played by the nuclear
uncertainties associated with key reactions of the NeNa-MgAl cycles on the
synthesis of 22Na and 26Al.
