Small Nuclear Reactors coming closer to fruition:http://www.businesswire.com/news/home/20170313005622/en/GE-Hitachi-Nuclear-Energy-ARC-Nuclear-Announcehttp://www.arcnuclear.com/
(interesting 20 year refuling cycle)
Small enough that its modularized components can be shipped and installed at the site using regular commercial equipment, such as barges, rail, trucks, and construction cranes.
Sodium as Coolant
The use of sodium instead of water as the heat transfer agent in the reactor allows the reactor to operate at ambient pressure. Its containment vessel is a double walled stainless steel tank rather than a 12 inch thick forged steel containment vessel required for traditional light water reactors.
Effectively "walk away" fail safe and protection of the reactor from a melt down does not depend on extra pumps, operator intervention or any external system in the event a disaster destroys all electric power to the plant site.
Re-use of Nuclear Waste
The ability of ARC-100 to recycle traditional nuclear waste and generate energy, burn or transform plutonium that could be used for weapons and eliminate the need to bury or store large quantities of nuclear waste.
Twenty Year Refueling Cycle
The proprietary reactor core of the ARC reactor is designed to operate for 20+ years without refueling.