One of the prime requirements of any power station is a supply of cooling water of the order 15 million gal/h. For this reason, although, of course, other factors affect the choice of site, where possible the station is erected on the coast or near a large river. This applies especially to nuclear stations, which use more water than conventional power stations. Using either of these sources of water creates problems in the cooling system. As an example, in the case of sea‐water the salt content promotes electrolytic action between adjacent dissimilar metals. River‐water, which is often polluted by domestic and industrial sewage, has its own particular disadvantages, and estuarine water obviously combines both problems.
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