[en] A new dose assessment system, RASCAL, has been developed for the US Nuclear Regulatory Commission (NRC) for use during response to emergencies. The model is designed to provide a rough comparison with EPA Protective Action Guidance and thresholds for acute health effects. RASCAL will be used by the NRC personnel who report to the site of a nuclear accident to conduct an independent evaluation of dose and consequence projections. The model was developed to allow consideration of the dominant aspects of source term, transport, dose, and consequences. The model graphics were designed for use on the COMPAQ Portable III microcomputer used by the NRC response personnel who respond to the emergency. However, the model can be run on any DOS system. The model results can be displayed as text or in graphical form. The development of the model is ongoing. Subsequent versions are planned to: (1) allow the previous cases to be stored, (2) include fuel cycle facilities and containment monitor readings in the source term methods, (3) include terrain and building wake in the transport and diffusion methods, and (4) estimate exposure rates. 26 refs., 13 figs., 15 tabs