Abstract: Pumping ejector having a fixed tubular ejector body passing through the wall of a protective cell. In its part which projects into the cell this body has an extension provided with a first lateral connection for the admission of a pumping steam flow, a second lateral connection connected to a pipe for admitting a fluid to be pumped and an axial diffuser for the outflow of said fluid shaped in convergent-divergent manner and fitted into the body behind the diffuser. It also comprises a tube having an intake opening for the steam flow introduced into the body by the first connection and has at its end facing the diffuser a nozzle for accelerating the steam for the entrainment of the fluid to be pumped.