Efforts were concentrated on plant operating modes. The Heber plant, which was previously designed for consistant brine temperature, was reviewed and changes necessary to accomodate declining brine temperature were determined. Resultant required modifications to the computer code GEOTHM were made. The engineering, in terms of sketches and equipment lists, needed to support the capital cost estimate was determined. Attempts to use the computer program GEOTHM to develop the heat and mass balances for plants with declining geothermal fluid temperature disclosed that this code alone cannot be used for this purpose because it does not include turbine stage pressure-drop equations. It was determined that the most expedient method for obtaining the data needed for this study would be to develop a separate small computer program containing these turbine equations. With the assistance of a turbine consultant, the detailed methodology for the program was developed, and coding was started. (MHR)

KOVEC is a one-dimensional, Lagrangian, elastic--plastic material motion code that is available for both 7600 and STAR computers. The elastic--plastic formulation is in the principal stress coordinate system; the von Mises yield condition is used. Models for work hardening and temperature- and pressure-dependent yield strength and shear modulus are available. The hydrodynamic equations of state are analytic functions of relative volume and total internal energy. The coding allows an unlimited number of voids to open and close. The present document describes both the physics models and the user features of the KOVEC code. 3 figures, 5 tables.