In repair work performed on existing hydroelectric power plants, requirements are increasing for their simplification, rationalization, labor-saving in operation and maintenance, and realization of pollution-free operation. In this field, we have proposed a life-cycle concept aimed at synchronizing the overhaul cycles of the respective equipment, minimizing maintenance in the next overhaul, and saving running costs, in order to reduce the overall maintenance costs. Under this concept, we are making efforts to refresh existing hydroelectric power plants through the development of technologies to extend the life of equipment and advanced flow analysis to enhance the performance of hydraulic turbines, together with the application of other new technologies and new products.
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