Timescales would depend on legislation, the safety authority, site selection, public consultation, licensing, design, supply chain, financing, and construction. Some international projects have taken very long; others have been faster in countries with active supply chains and standardised designs. For Italy, which has no operating plants, the institutional and industrial restart would be a decisive variable. '30 years' is possible as a pessimistic scenario, not a technical law.
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88.
Would it take 30 years to build a nuclear plant in Italy?
There is no data to fix a single number.