Acquiring a pumped storage power generation site utilizing river water recently faces several restrictions due to environmental assessment. On the other hand, there are many sites favorable for constructing a pumped storage power plant utilizing seawater in Japan, which is surrounded by the sea. Seawater pumped storage power plants have several advantages such as lower civil construction cost and lower power distribution cost due to their proximity to nuclear or steam turbine power plants. Seawater pump turbines are used under the condition where the corrosion environment is noticeably severe, rather than conventional river water pump turbines. In addition, the pump turbines have many narrow spaces between parts and their major parts are embedded, so that it would be very difficult to apply proper corrosion prevention measures. The problem cannot be solved only by the conventional corrosion preventive engineering.
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Oshima et al. (1999) studied this question.