Steam generating system for nuclear power plants

The invention refers to a steam generator system for nuclear power plants. For blowdown during operation of the steam generator a blowdown circuit is provided allowing the blowdown water to be recycled. In addition, a flow reversing circuit passed through the blowdown pumps is provided through which purging water taken from the upper region of the steam generator during the wet-preserving phase can be fed back through the blowdown circuit, the flow being reversed. During wet preservation inert gas, especially nitrogen, can be extracted from the gas volume of the steam generator via a flower circuit and blown in through the blowdown pipe. This connection allows periodical flow reversal during the wet-preserving phase, the sludge that may occur being filtered off. (orig./GL)