The D&D of Nuclear Facilities: A Systemic Approach for Project Organization and Monitoring.

International audience ; The Decommissioning and Dismantling (D&D) of Nuclear Facilities is changing. Facing the increasing number of end-of-life facilities and the need to anticipate and ensure safety at any time, decision makers adopt a new industrial strategy. They focus on the process optimization and reproducibility to reduce costs and lead times of the projects which are both in progress or planned.The digitizing of the nuclear field, already started, has permitted a lot of technological improvements. For instance, mechatronics limit human attendance and exposure in radioactive cells, and computer science tools simplify data, knowledge and project management, especially thanks to feedback.Nevertheless, data associated to each nuclear facility are numerous, various, and are difficult to be coordinated and shared. The lifecycle of a nuclear facility is often very long with sometimes numerous configurations during the operation phase. Then data quality may decrease, mainly due to successive interpretations and the lack of traceability. In addition, the uncertainty of the data is significant because raw data may be incomplete and uncertainty rate is not always specified and explained. Data availability is not always assured. Some data are difficult to interpret, not digitized, untraced… Therefore, these issues make it difficult to develop complete and reliable digital mockups despite the use of some new technologies such as BIM (Building Information Modeling).Another strong issue comes from the main stakeholders' needs especially from those who are responsible for nuclear facilities during the main phases : design and construction, operation, decommissioning. Indeed, they do not have the same goals and missions, then they don't have the same requirements. While builders have a strong need for accurate devices' geometric informations, operators will need to know a lot more about the processes : power, flow rates, inputs, outputs, capacity… At last dismantlers need to have a detailed follow-up concerning the ...