Comparison and validation exercises of the three atmospheric dispersion models in RODOS

During the EURANOS project three atmospheric dispersion models ATSTEP (ATSTEP, 2007), RIMPUFF (RIMPUFF, 1999), and DIPCOT (DIPCOT, 2009) used in the RODOS (Ehrhardt and Weis, 2000) decision support system were subject of comprehensive comparison and validation studies. The aim of the comparison exercise was a harmonisation of the models for a sample of representative, non-complex dispersion and deposition situations in the distance range below 100 km. Despite of different modelling and parameterisation the models should deliver similar results under these conditions. Furthermore validation studies were carried out with ATSTEP and DIPCOT using measured meteorological and contamination data from tracer dispersion field experiments. After minor model and parameter modifications final comparison calculations of the models with realistic numerical weather prediction (NWP) data have shown satisfactory consistency of the results

A proposed countermeasure simulation model for the new ICRP recommendations

In April 2011 the European Platform on Preparedness for Nuclear and Radiological Emergency Response and Recovery (NERIS-TP) decided to expand the two European Decision Support Systems JRodos and ARGOS with respect to the new ICRP-103 recommendations. The extension should be applicable for nuclear accidents and radiological emergencies and comprise a new screening model, the possibility to optimise dose reducing actions with the models ERMIN (European Model for Inhabited Areas) and AGRICP (Agricultural Countermeasure Program), respectively, and scenario preparation tools to support the user in defining countermeasure strategies. This paper describes the screening model that was developed by the authors and is foreseen for realisation and inclusion in JRodos and ARGOS in 2012/2013