Oil prices have been rising significantly in recent years. The result is a steady lowering of the economic break-even point of nuclear power plants. Already, our actual oil price level allows nuclear dual-purpose plants to become efficient below a thermal power of 800 MW. Two special applications of an Integrated Pressurized Water Reactor System use the waste heat of-the turbine for district heating or water desalination. An integrated system of heat pump and nuclear heat source avoids the usual transportation losses from the power plant to the compressor of the heat pumps.