Abstract: A prototype 3D simulation system for reactor decommissioning based on the DELMIA and VIRTOOLS was built. Based on this simulation system, the 3D radiation field computation and visualization program were proposed by combining independent simulation system and database with computation core. Computation model of 3D radiation field was based on the point-kernel method and the polynomial fitting formula between energy logarithm and translation factor was acquired. In the model, the shielding and self-absorption of devices were considered, and the computing errors of the radiation level at key points were less than ten times of the measuring data. The computation software of 3D radiation field was programmed based on the software of VS and SQL server. Dynamic calculation and data refresh of 3D radiation field were realized. Computation model of personal dose based on walking path was proposed and visual display was realized.

Key words: reactor decommissioning, radiation field calculation, computation program, radiation field visualization, radiation dose visualization