Abstract: The integrated nuclear emergency command and decision support system is mainly used for reactor operation monitoring, emergency command, reactor condition assessment, environment impact prediction analysis, decision support and emergency data management of nuclear power plant. The system acquires the data of reactor operation, meteorology, environment radiation from relative databases in realtime, monitors the unit operation by picture configuration, then execute the emergency status degree assisted judgment, reactor core damage assessment, source term calculation, environment impact prediction analysis, operation intervention level calculation based on data from database or manual input. The system builds in a protection action analysis model for three phases of accident sequence, which are start emergency, pre-release from containment and release to environment. The system displays the emergency resources and facilities, emergency assessment results (equivalent dose curve, protection action region, and etc.) using WebGIS. The paper introduces the process, functional module design, development plan, and the main models of the system.

Key words: nuclear emergency, nuclear accident, decision support, emergency assessment, emergency command, WebGIS