[en] This report describes an engineering conceptual design study of a fusion reactor power plant based on the theta-pinch concept. A high-β, D-T plasma is produced by means of a programmed pulsed magnetic field in an approximately toroidal chamber having major and minor radii of 56 m and 0.5 m, respectively. The field produces a short, fast implosion stage followed by a longer adiabatic compression stage during which the D-T fusion occurs. The D-T burn stage has a duration of approximately 0.080 s, and the cycle time is 10 s. To protect the first wall after the burn, a gas blanket is used to cool the plasma in a slowly decreasing magnetic field. The fusion reactor power plant consists of 10 major systems as follows: implosion heating, plasma compression and confinement, magnetic energy transfer and storage, first wall, blanket, biological shield, fuel supply and removal, fuel-ash reprocessing, lithium processing, and energy conversion. Liquid lithium is the primary coolant. Other materials include alumina, provisionally chosen as the first-wall insulator, niobium as the first-wall and blanket structural material, beryllium as the neutron breeder, and graphite as a moderator. Two energy conversion schemes are considered: a conventional, low-temperature system which uses a Na-steam cycle, and an advanced, high-temperature steam system which uses a potassium topping cycle. Special attention is given to plasma burn dynamics, overall energy balance, blanket neutronics and thermal response, radiation shielding, radiation effects on and corrosion of construction materials, thermal and irradiation response of the Al₂O₃-Nb first wall, and tritium recovery and containment. Unique features of the design include a novel superconducting magnetic-energy transfer and storage system and a modular blanket structure which permits easy access for maintenance. (author)