[en] For many years, study of whole-core transients and accidents in fast reactors has been a major element of safety research and development programs in the US. Numerous models and computer codes have been developed and validated for use in these studies. Historically, emphasis has been placed on describing the core disruptive accident, but more recently emphasis has shifted to describing accident sequences prior to core disruption, with a focus on modeling the mechanisms which could terminate a sequence prior to core disruption. The major models and codes related to transient and accident analysis are reviewed with discussion of the state of development and validation. 9 refs