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The purpose of the Nuclear Power Plant Modules, NPP-1, is to determine the total cost of electricity from a nuclear power plant in terms of all the components contributing to cost. The plan of analysis is in five parts: (1) general formulation of the cost equation; (2) capital cost and fixed charges thereon; (3) operational cost for labor, maintenance, and repair; (4) fuel cost, arising from the fuel cycle; and (5) the effective load factor during the cost analysis period. A parametric analysis of the generating cost of nuclear power is reduced to determining the effects of six independent variables, such as plant load factor (PLF), special plant cost (SPC), fixed charge on capital equipment (FC), specific fuel cost (SFC), average new plant efficiency during load cycle (EFF), fuel burnup (B) on the four dependent costs of capital cost of electricity (CCAP), operating cost of electricity (COP), fuel cost of electricity (CF), and total cost of electricity (CTOT) in mills/kwh. The computer program ECOST is shown with a description of how to perform the parametric analysis. The program assigns three values to each of the six independent variables, an initial normal value, and upper and lower abnormal values. (Author/SK)