The Thesis discusses about safety systems of nuclear power plants, primarily about passive containment protection. That have aims to reduce increase of pressure during the LOCA. It occupy specific type of passive system, it is Ice Condenser. In chapters is make step by step design of replacement current material for other material, that changes its phase at higher temperature. It chose a suitable material, prepared thermal calculation and structural design. Finally is prepared the economic analysis of production of new type condenser.