Abstract: A condenser, comprising a steam inlet and an exhaust chamber which are connected via a plurality of cooling tubes connected in parallel, which exhaust chamber is provided with an exhaust opening which is connected to a pump, wherein the condenser is provided with a supplemental barrier to screen the pump during use from steam breaking through a cooling tube, as well as to screen the other cooling tubes from steam from a cooling tube subject to steam breakthrough. A method for condensing steam in a cooler, wherein by means of a pump a pressure is maintained in the cooler, and wherein the inert gas discharge is screened from steam breaking through the cooler.