Aqueous chemistry and phase behaviour under generation IV supercritical water reactor conditions

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The "Generation IV" CANDU Supercritical Water-Cooled reactor ("SCWR") is a conceptual design for a would produce super-critical water at temperatures as high as 625°C to generate electricity, hydrogen and district heating. The use of super-critical water to carry heat from the reactor core to the turbine will generate much more extreme water chemistry conditions than those found in the current CANDU-PHW design, which operates from 250 to 320°C. The long term viability of the Gen IV CANDU-SCWR concept depends on the ability of designers to predict and control water chemistry, in order to minimize radionuclide transport and subtle corrosion effects. The region of most importance is the range from 275 to 450 °C and 25 MPa, the so-called "pseudo transition zone" which includes sub-critical and supercritical aqueous solutions at liquid-like densities. This is a frontier region of hydrothermal chemistry, both because the SCWR would require a unique