Modelling and assessment of accident consequences: Development of a computer-assisted decision-support system RODOS/RESY for nuclear emergencies

In cooperation with NRPB, the specifications of the mainframe COSYMA version 95/1 and the PC COSYMA version 2.0 were prepared and the corresponding modifications implemented. Important improvements are dose-rate dependent models for deterministic health effects, the time dependent efficiency of stable iodine tablets, the extension of data bases for the inclusion of activation products, and supplementary evaluation programs. PC COSYMA has been completed by an economics module, further options in the ingestion pathways, and a graphics package for presenting assessment results. COSYMA has been applied for probabilistic dose assessments within paramter studies and special investigations of EPR concepts. RODOS, the real-time on-line decision support system for nuclear emergency management, has been further developed with the aim of the first pilot version 2.0 for pre-operational application in the second half of 1995. At present, some 20 institutes in the EU, 8 institutes in Russia, Belarus and Ukraine, and 5 institutes in central and eastern European countries cooperate with FZKA/INR as main coordinator. The working meeting of all contractors in Interlaken (CH), 20-24 June 1994, lead to the consolidation of the international cooperation and a broad consensus about the future role and use of the RODOS-system, in particular in the Eastern countries. At the national level, the approval of a strategy and position paper on RODOS/RESY (the near range and early phase subsystem) by subcommittees of the German Radiation Protection Commission can be considered as a step further to the future use of the system in emergency centres of the Federal States. (orig./HP)