Nuclear reactors have a heat efficiency of ~33% so you need to dump the remaining somewhere. That is 66% of the heat energy remain after the turbine has removed

Nuclear reactors have a heat efficiency of ~33% so you need to dump the remaining somewhere. That is 66% of the heat energy remain after the turbine has removed the possible mechanical energy. Just an annoying factor of Carnot's Law. If you can do district heating or similar it's all good, but you still need a permanent source of cooling capacity with enough redundancy to cool the reactor in case of an unplanned shutdown.