IAEA compiled a list of around 56 Small Modular Reactors (SMR) currently under consideration across the world in the 2018 Supplement to its Advanced Reactors Information System (ARIS). Several of the reactors described in this reference are currently under construction or under licensing, while the majority of them are currently being designed. Out of these 56 SMR concepts, only 9 fast reactors designs are under consideration, with 7 of these designs considering the use of lead or leadbismuth eutectic as a coolant. None of these reactors concepts are under construction as of now.