In order to create, ensure the functioning and effective use of the megascience-project, it is necessary to have a holistic view of the concept of "megascience", the basic processes and constraints that accompany this activity and the project life cycle. For this purpose an analysis of the life cycles of various megaprojects was carried out, and as a result of the analysis, the main stages characteristic of all the projects reviewed were identified. Also considered are approaches to the implementation of these stages and a list of possible restrictions and risks is defined. Based on the data obtained, a model for creating a megaproject on the territory of the Russian Federation is proposed, in particular, it is planned to apply the obtained result in the process of creating the International Center for Neutron Research based on the PIK high-flux research reactor. The reported study was funded by RFBR according to the research project № 18-29-15015.