[en] Systems analyses have been performed in order to determine the parameter ranges for economic operation of equilibrium commercial fusion power plants using noncircular tokamak reactors. The results of these studies show that: (1) Neutron wall loadings over 2 megawatts per square meter may be unnecessary for economic tokamak operation. (2) Electrical power levels beyond 1000 MW(e) are not required. In fact, power levels as low as 100 MW(e) may be acceptable. (3) Total beta values of 10 to 12 percent are adequate. (4) Duty cycles as low as 50 percent have only a small effect on plant economics. (5) An acceptable first wall lifetime is 15 MW-yr per square meter