Turbine for turbomachine

An assembly for a turbomachine having longitudinal axis (X), the assembly comprising a nozzle guide vane assembly carried by an annular part which is fixed to an outer casing surrounding an annular row of moving blades arranged downstream of the nozzle, the nozzle comprising an outer annular platform from which extends, radially outwards, a radial annular wall which carries an annular attachment tab configured to hook the nozzle to the annular part, the annular attachment tab extending longitudinally upstream from the radial annular wall, the assembly further comprising a cooling circuit which comprises an inner annular chamber delimited radially by the outer annular platform and the annular part and delimited downstream by the radial annular wall, an intermediate annular chamber formed radially externally to the annular attachment tab and is in fluid communication with the outer casing, and means of fluid communication between the inner annular chamber and the intermediate annular chamber, said means being formed in the annular attachment tab of the nozzle.