Combined effects of stress, σA, and fracture cavitation on the creep rupture life, tR, have been studied in conventionally cast MAR-M 002 alloy tested at 1173 K (900 °C) over a limited range of stress (σA = 200–400 MPa). It is predicted that the creep fracture cavity growth is controlled by the coupled power-law creep with the grain-boundary diffusion mechanism. On the basis of this prediction the Edward–Ashby model overestimates the creep rupture life although this model correctly describes the trend in the data. The observation of a linearity between the cavity density, NA, and the product εRtRσ4A indicates that this relationship can be used to predict the creep time, tR, where εR is the rupture strain. Furthermore, another empirical method is the creep-fracture parameter, Kf = σf(πac)1/2, approach, developed using the modified Griffith–Irwin type of relationship, which can also be used to predict the creep rupture life in the present alloy, where σf is the creep fracture stress (or the applied stress, σA) and ac the crack (or cavity) size.