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Technology (Generation III+) is already shared with France, India, Finland, UK, Japan, China. Generation III+ are likely the most efficient/safe nuclear reactors at the moment. Ideally we would start to build hundred of them, so we could electrify our societies (including heat, transport, industry), and so we could transition faster to low carbon emissions world.

The main international cooperation seems to be for the nuclear fusion with ITER. "ITER has already been described as the most expensive science experiment of all time,[24] the most complicated engineering project in human history,[25] and one of the most ambitious human collaborations since the development of the International Space Station (€100 billion or $150 billion budget) and the Large Hadron Collider (€7.5 billion budget)".