Cooling system for auxiliary systems of a nuclear installation

Cooling system for auxiliary systems of a nuclear installation for heat removal from heat exchangers, the heat exchangers being connected on the primary side thereof to lines which may contain radioactive liquids or gases, the heat exchangers being disposed within a containment wall in a secured area of the nuclear installation, and the heat exchangers having connections on the secondary side thereof for cooling liquid lines, the improvement comprising an outgoing line for the cooling liquid connected to the connection on the secondary side of the heat exchangers, additional external heat exchangers being disposed outside of the containment wall and having an inlet and an outlet side, said inlet side of said additional heat exchangers being connected to said outgoing line, a return line for the cooling liquid being connected to said outlet side of said additional heat exchangers, said additional heat exchangers being in the form of a dry cooling tower having cooling elements connected to said outgoing and return lines on the inlet and outlet sides thereof, respectively, a refrigeration loop having a supplemental heat exchanger with the primary side thereof connected in said return line, a bypass line connected from said outgoing to said return line parallel to said cooling elements and supplemental heat exchanger, and a control valve connected in said bypass line.