Late to this thread but I have always asked why nuclear powerplants can't use seawater for cooling and the condense the steam to create desalinated water? Oce

Late to this thread but I have always asked why nuclear powerplants can't use seawater for cooling and the condense the steam to create desalinated water? Ocean waves can be used to create electricity and it is also possible to create a dam that uses an artificial river sourced by the ocean and make hydroelectric plants to use that energy. Is it a cost issue in both cases that prevents using electricity generated that way to desalinate?