The following are covered: construction status, operation activities, and project cash flow. (MHR)

Under the Solar Heating and Cooling Demonstration program, solar heated and cooled commercial buildings are to be constructed throughout the nation to show the technical and economic feasibility of solar energy systems and, most importantly, to establish an economically viable solar industry. The questions arise: How many solar energy systems must be installed and where should they be installed to meet these objectives. This report presents an answer to these questions.

An account of irradiation of glass samples in the LPTR reactor is given. Irradiation procedures are described and irradiation exposure times and neutron fluence values are tabulated. (JRD)

Heavy metal sulfides form a substantial part of the scale solids depositing from high-temperature, high-saline geothermal brines. An assessment has been made of the prospects for controlling this deposition by chemical modification of the brine. An outline is given of the types of reactions influencing sulfide precipitation. It is suggested that two factors affecting sulfide solubility and that are amenable to chemical modification of the brine are oxidation state and pH. A partial oxidation process can be used to convert aqueous sulfide species to free sulfur, a process favored by thermodynamics and kinetics. Some oxidizing agents are suggested for this purpose. A discussion is given of the possibilities of precipitating other solid phases after extensive oxidation. It is concluded on the basis of the available data that this possibility exists, but that uncertainties in reaction kinetics, unavailable data, and solution complexity make an exact analysis difficult. The usefulness of a field evaluation of chemical modification processes is indicated. (auth)