Abstract: The disclosed power plant can attain an extremely high thermal efficiency, as compared with that of the conventional power plant. The power plant comprises a steam system and a mixed medium system. The steam system comprises a heat source (1) for generating steam; a steam turbine (3) driven by the steam generated by the heat source; a steam condenser (81) for forming condensed water by condensing exhaust of the steam turbine; and a condensed water feeding pump (9) for feeding the water condensed by the steam condenser to the heat source.

Abstract: A method and an apparatus for removing hydrogen and other impurities contained in liquid metal. The liquid metal containing hydrogen and other impurities is cooled below their saturation temperature to precipitate hydrogen and other impurities in the form of various compounds of the metal, and the precipitate is trapped and accumulated. The thus accumulated precipitate is then dissolved in a small amount of liquid metal having a temperature at least above said saturation temperature to produce high temperature liquid metal having a high hydrogen concentration. The high temperature liquid metal is contacted with one side of a metal membrane having a hydrogen permeability, another side of which being at reduced pressure, thereby selectively removing hydrogen in gaseous state from the liquid metal.