In April 2011 the European Platform on Preparedness for Nuclear and RadiologicalEmergency Response and Recovery (NERIS-TP) decided to expand the two European DecisionSupport Systems JRodos and ARGOS with respect to the new ICRP-103 recommendations. Theextension should be applicable for nuclear accidents and radiological emergencies andcomprise a new screening model, the possibility to optimise dose reducing actions with themodels ERMIN (European Model for Inhabited Areas) and AGRICP (Agricultural CountermeasureProgram), respectively, and scenario preparation tools to support the user in definingcountermeasure strategies. This paper describes the screening model that was developed bythe authors and is foreseen for realisation and inclusion in JRodos and ARGOS in2012/2013.