The main results of the work done at the Research and Design Institute of Electrical Technology on the development of designs and the creation of nuclear steam-producing systems (SPS) for propulsion are presented: the SPS VM-A for the first Soviet nuclear powered submarine, the SPS V-5 for the most powerful and fastest submarine with design 661 in the world team, and the designs of the first SGS MBU-40 with an integrated reactor. The basic technical solutions incorporated in the design of an integrated reactor for an advanced steam generating system are described.