Talk:Nuclear reactor safety system

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Passive cooling, turbine-driven cooling

The "Essential Service Water System" - that's the normal water circulation if I understand it correctly? It seems that all cooling systems mentioned in the article requires electrical power to operate? I've heard that newer power plants are supposed to have three layers of emergency cooling in case the active cooling should be lost; passive cooling (which would keep the core below melting temperatures for at least 24 hours without any power or work done, and infinitively if the water is replenished), turbine-driven cooling (cooling circuits kept going by the reactor heat itself, self-sustaining for as long as the reactor needs to be cooled down) and air-cooling ...