Abstract: Nuclear emergency auxiliary decision-making system is important, and the evaluation about equipment damage situation within the unit, expansion trend of accident, feasibility of emergency intervention plays important roles in post-accident decision-making. In terms of accident evaluation, traditional simulator and real-time information system have their own limitations, which can not fully assist emergency decision-making after the accident. By combining advantages of the two and studying technical solutions for accident evaluation and prediction based on online simulation systems, this research provides accurate 3D display, evolutionary trend prediction and simulation deduction of intervention measures to support making scientific and effective emergency decision.

Key words: nuclear emergency; simulation system; 3D model; accident evolution; accident prediction