 The design is not yet specific to reactor power output.Notably, a 335 MW output has been proposed, but it could be tweaked to be as low as a 100 MW unit.IRIS is a smaller-scale design for a Pressurized water reactor (PWR) with an integral reactor coolant system layout, meaning the steam generators, pressurizer, control rod drive mechanisms, and reactor coolant pumps are all located within the reactor pressure vessel.