Small reactors are big news, particularly the 180-MWe Generation III++ Bab- cock & Wilcox mPower small modular reactor (SMR). This SMR has all the features of its larger cousins, but the entire reactor and nuclear steam supply system are incorporated into one reactor vessel, all about the size of single full-size pressurized water reactor steam generator. Expect the first mPower and probably the first SMR-to enter service before 2022.