It’s a part of a $12 billion purchase by Brazil

Brazil on Dec. 23 signed contracts worth $12 billion to buy 50 military transport helicopters and five submarines from France.

The submarine deal involves the purchase of four conventionally powered Scorpene submarines, and the construction of a nuclear-powered submarine to be built with French cooperation.

It’s unclear to me what “French Cooperation” means, though it appears that the nuclear reactor would be a wholly Brazilian endeavor.