Using SmartPlant technology, an information management system (IMS) was created to support the decommissioning of the Beloyarskaya Nuclear Power Plant (BNPP) in Russia. The IMS integrated laser scan data, engineering drawings, radiation survey data, and documentation into a 3D model of the BNPP turbine island. This model was used to plan the dismantling and deconstruction of the turbine island by identifying "hot spots" of radiation and optimizing the work process. The IMS provided a comprehensive digital twin of the physical plant that supported planning, simulation, and management of the decommissioning project.