Patent Number: 039727726
Section: claims

1. Filter system for the purification of blowdown water in steam power plants having nuclear reactors, comprising a blowdown water line, an electromagnetic filter having an inlet connected to said blowdown water line and having an outlet line, a mixed bed filter for ionogenic impurities connected to said outlet line of said electromagnetic filter, a by-pass line disposed in parallel with said mixed bed filter, means for purifying said electromagnetic filter and said mixed bed filter independently of each other comprising, for purifying said electromagnetic filter, a closable valve connected in said outlet line and an openable valve connected in said by-pass line and, for purifying said mixed bed filter, an outlet line extending from said mixed bed filter and at least one inlet line connected to said mixed bed filter for supplying a regenerating medium thereto, and valve means connected to said by-pass line and to said outlet line of said mixed bed filter and being selectively actuable, when purifying at least one of said filters, to connect said one of said filters to a waste water preparation installation and, when filtering blowdown water in at least one of said filters, to connect said one of said filters to a cooling water circulatory system. 2. Filter system according to claim 1, wherein a resin catcher is connected in said outlet line of said mixed bed filter.