The sealing of a crack in a pool of a nuclear facility, using a robot. The invention concerns the sealing, in particular, of a crack in a wall of a pool of a nuclear facility. In particular, the invention implements a mobile robot carrying an adhesive tape dispenser (DIS). At least the following are provided: - control of a plurality of suction systems (V11-V14; V21-V24), the dispenser being mechanically integral with a first suction system (V21-V24), and - a step of controlling the movement of the first system (V21-V24) relative to the other systems (V11-V14) of said plurality of systems.