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The main cooling water system of the Gösgen nuclear power plant discharges no longer usable condensation heat into the atmosphere via the cooling tower circuit. Depending on the weather, between 400 and 700 litres of water evaporate per second in the cooling tower. The evaporated water is replaced by treated supplementary water from the upstream water channel of the Gösgen hydropower plant. Around 2,200 litres of water per second are fed into the Gösgen nuclear power plant via a culvert, where it is allocated to the nuclear and conventional secondary cooling water systems. There is a second water intake at the downstream water channel of the Gösgen hydropower plant. This redundant cooling water supply is only required in an emergency if the cooling water supply from the upstream channel fails.