[en] Whereas a figure indicates recommendations made by the IRSN for a better control of entrances and exits (into and from a reactor building and a nuclear area) in order to avoid radiological dissemination, this article describes how the radiological control chain of each nuclear site ensures staff safety, avoids radioactivity dissemination within and outside nuclear plants. The objective (notably for the IRSN) is to improve the traceability of individual controls, and to check the adjustment parameters of some detection gates. The IRSN regularly controls these aspects and may ask EDF to produce controls and to implement measurement improvements