EVALUATION OF EARLY COUNTERMEASURES AND CONSEQUENCES IN RODOS-RESY

The paper describes the models and program structures. methods and dat a in the German real-time decision support system RESY, which has been developed with the support of the Ministry of Environment (BMU), Germ any. It is part of RODOS, the CEC real-time on-line decision support s ystem for nuclear emergencies, whose first prototype version was demon strated during the workshop. RESY, the system for near-range early pha se applications. has a three steps concept of information processing: analysis and prognosis of the radiological situation, simulation of co untermeasures and assessment of their consequences, and evaluation of consequences to determine the most suitable countermeasures. To that p urpose, the following models have been developed and implemented in RE SY: (1) a fast gaussian puff model for atmospheric dispersion calculat ions and the determination of the concentration and radiation fields i n the environment of the site after releases of up to 15 nuclides; (2) simulation models for early emergency actions like sheltering and eva cuation, distinguishing up to five action areas with different time pa tterns of actions defined by intervention levels; methods for the calc ulation of doses with emergency actions; (3) models for calculating de terministic and stochastic somatic health effects and the economic cos ts associated with them and the underlying emergency actions; (4) a ru le based expert system containing components of multi-attribute value techniques for evaluating and ranking alternative courses of emergency action.