Design and development of nuclear accident offsite consequence assessment system (NAOCAS_—V3.0)

Based on decades of development experience and condition with current international and development technology and trend, China Institute for Radiation Protection (CIRP) developed a new nuclear accident offsite consequence assessment system (NAOCAS_—V3.0). The system architecture adopts Client/Server (C/S) combined with Browser/Server (B/S). Geographic information platform for 2D and 3D spatial analysis technology and physical module chains are both derived from independent innovations with proprietary intellectual property rights. The physical modules in the system are verified by field tracing experiments and are compared with similar systems such as InterRAS, Rascal and JRODOS (Java Real-time On-line Decision Support System). The preliminary results of model-evaluation and system-system intercomparison demonstrate that the numerical methods used in the NAOCAS system are accurate. Through the interaction between users and systems, users can further enhance the ability of space analysis and application of the consequences of nuclear accidents. This paper introduces architecture and functions and applications of the system (NAOCAS_—V3.0), it had been successfully applied in the '2015-Aegis' national nuclear emergency exercises and ConvEx-3 (2017) International Convention emergency exercises, as nuclear emergency evaluation resources for the national nuclear emergency response center. (author)