I understand that there advantages to Sodium cooled reactors, particularly the fact that, because of the small cross section of the nucleus of Sodium, you can get a much more complete burn with fewer waste products, but that the Sodium-Cooled Fast Reactor Prototype Development, memorandum of understanding (MOU) will lead nowhere.

The U.S Department of Energy (DOE), the French Atomic Energy Commission (CEA) and Japan Atomic Energy Agency (JAEA) have expanded cooperation to coordinate Sodium-Cooled Fast Reactor Prototype development through a Memorandum of Understanding (MOU). The MOU establishes a collaborative framework with the ultimate goal of deploying sodium-cooled fast reactor prototypes. A sodium-cooled fast reactor uses liquid sodium to transfer heat, burning the plutonium and other transuranic elements in the process producing clean, safe nuclear power, less waste and increasing non-proliferation goals.

This makes the Hindenberg look like a cap gun.

Liquid Sodium explodes on contact with air.