Abstract: Decommissioning of nuclear facilities is a complex system engineering task that involves radiation and industrial risks. This paper presents a construction plan for a decommissioning simulation platform based on international virtual simulation research of nuclear facility decommissioning. This study further explores key technical issues in decommissioning collaborative design and construction management, thus proposing corresponding solutions. Utilizing these methods, the China General Nuclear Power Group's decommissioning simulation platform has been successfully developed and applied. The practical results demonstrate that virtual simulation technology, with advantages of low cost, repeatability, and visualization, has significant potential in the field of nuclear facility decommissioning. It can effectively reduce construction changes, lower project risks, and enhance the quality of engineering.

Key words: decommissioning of nuclear facilities, virtual simulation, digital twin