|Genealogy of reactors|
The family tree has branches extinct or nearly extinct, while others are vigorous or emerging. The six Generation IV designs appear at the top of the tree: (V)HTR (very) high temperature reactors; SCWR supercritical water reactors ; FBR sodium or lead cooled Fast Breeder Reactors; MSR Molten Salt Reactor. Which will expand? Some other abreviations: PWR pressurized water reactor ; WPu Weapon-grade plutonium reactor ; CANDU Canadian reactors, using natural uranium, cooled and moderated by heavy water ; Magnox and Advanced gas-cooled reactor (AGR) UK graphite moderated reactors,: ADS Accelerator Driven Systems.