Impeller having a radial seal for a turbine engine turbine

A turbine engine impeller comprises a disc bearing vanes and an annular plate. The roots of the vanes are fitted in grooves and the root of each vane is connected to a blade by an integrated platform. The platforms of said vanes cooperate to form a radially inner wall of a duct for a flow passing through the blades. The annular plate comprises a transverse annular portion forming an axial stop of the roots of the vanes. The integrated platform of each vane has no spoiler and stops axially to the right of transverse faces of the root. The transverse annular portion of said annular plate bears, between the integrated platforms and the disc, an annular spoiler configured to extend in an axial space between the impeller and an adjacent module of the turbine engine so that said annular plate bears annular knife-edge seals of a labyrinth sealing joint.