An estimation to measure and to evaluate the work times following the trajectory of workers during decommissioning of nuclear facilities

•Estimation on work time to optimize the trajectories of workers.•The scenario-based system in virtual decommissioning environments.•Statistical analysis and evaluation of work time and radiation exposure dose. This paper is intended to suggest an approach to an estimation of the work time to optimize the trajectories of workers during decommissioning of nuclear facilities. The working times during decommissioning for nuclear facilities have a great effect on safety and costs. The key feature of this work is to analyze and to evaluate the working times in virtual decommissioning environments. The measured data are statistically analyzed into the mean and variance work time and radiation exposure dose. It is expected that the safety of decommissioning will be improved and decommissioning costs can be reduced. It can be concluded that this work will make it possible to efficiently establish the ALARA plan for decommissioning of nuclear facilities.