The expert system also provides access to the simulation models of the assessment branch.

Depending on the emergency type, different sets of simulations tools are available. The accident scenario parameters have been collected at the RTXPS level, and are communicated to the models through the common Knowledge Base.

For toxic spills, the system includes a pool evaporation model that generated a dynamic source term for the atmospheric dispersion modeling.

In addition to the usual physical and chemical parameters (in part automatically loaded from the chemical substances data base), the model can represent the activity of intervention forces that control the spill.

The simulation of emergencies uses dynamic, spatially distributed models, e.g., for the atmospheric dispersion of a toxic spill. Pre-processors include a diagnostic wind field model and a pool evaporation model, that generate source term and wind field for the dispersion model.

The model is run under interactive control, so that the user can explore a range of accident scenarios easily.

Explosions are another emergency type for which built-in models are available.

The system offers both the standard and widely used but simple TNT equivalence model, as well as a more refined Fuel-Air Charge Blast Code (for multiple sources) based on the TNO Yellow Book.

To facilitate and support parameter estimation for both blast and ignition strength, the estimation procedures nomograms have been implemented as Rules in the embedded expert system.

This allows an operator with limited modeling experience to arrive at a plausible set of model parameters very quickly.