ASTRID (Advanced Sodium Technological Reactor for Industrial Demonstration) was a proposal for a 600 MW sodium-cooled fast breeder reactor (Generation IV), proposed by the Commissariat à l'énergie atomique (CEA).

It was the successor of the three French fast reactors Rapsodie, Phénix and Superphénix.

The main goals of ASTRID were the multi-recycling of plutonium, aiming at preserving natural uranium resources, minor actinide transmutation, aiming at reducing nuclear waste, and an enhanced safety comparable to Generation III reactors, such as the EPR.

[2] In 2014 Japan agreed to cooperate in developing the emergency reactor cooling system, and in a few other areas.

[6][7] In August 2019 France cancelled ASTRID and sodium-breeder in general, with an official statement that “In the current energy market situation, the perspective of industrial development of fourth-generation reactors is not planned before the second half of this century.