Classical trajectory calculations were carried out to investigate whether nonstatistical behavior is exhibited in two unimolecular processes of nitrosyl hypofluorite : CI) cis-trans isomerization and (II) F-O bond dissociation to produce F and ONO. For this purpose, an analytical potential function that describes these two processes was developed based on ab initio and experimental data reported in the literature. Total and individual rate constants were evaluated under two different types of initial sampling conditions : microcanonical (statistical) distribution of vibrational energy and selective excitation of vibrational modes. Under statistical initial conditions, the rates of isomerization are calculated to be substantially larger than the rates of F-O dissociation, although the branching ratios decrease as energy increases. In addition, the isomerization and dissociation reactions are faster when they occur from the trans isomer. Dissociation was found to be slightly faster than isomerization when energy was selectively deposited in certain vibrational modes of trans-FONO. Our results predict that both intrinsic and apparent non-RRKM behavior are present in the dynamics of the processes studied.