I found a source claiming that the total cost of their nuclearization program was 400 billion Francs (at 1993 inflation): https://www.world-nuclear.org/informat

I found a source claiming that the total cost of their nuclearization program was 400 billion Francs (at 1993 inflation): https://www.world-nuclear.org/information-library/country-profiles/countries-a-f/france.aspx https://www.world-nuclear.org/information-library/country-pr... At an exchange rate of 1 franc (1993) to 1 usd (1993) and 1 usd (1993) to 1.77 usd (2019), this yields a cost of 120 billion dollars. Not bad to decarbonize the electricity supply of a country with a GDP more than 1/8 that of the US. The nature of construction nuclear plants (and many other engineering products) is that that serial production is cheaper than the first several models, since the cost of development needs to be recouped. There are only 2 EPRs in operation and 4 in construction. By comparison, during the Messemer plan, 30 reactors of the same 900 MW design and 20 reactors of the 1300 MW design were constructed. This isn't counting reactors exported to different countries. Of course first 6 EPRs are going to be more expensive per unit as compared to serial runs in the dozens.