Cobalt behavior on the boiling water reactor (BWR) fuel rod surface was experimentally evaluated at 285 C and with various pH values. Adsorption of cobalt ions on hematite particles proceeded via the exchange reaction of cobalt ion with the surface hydroxyl of the hematite. The equilibrium constant tor the adsorption at 285 C was found to be ~570 times as large as that at 20 C. The adsorbate formed cobalt ferrite at the rate of 3.4 × 10 2 g-Co/g-Co adsorbed/h. The dissolution rates of cobalt ferrite and cobalt oxide particles were found to depend on (H+)1.1 and (H+)1.2, respectively, where (H+) means the H+ concentration. Cobalt ions were released from these oxides when O2 ions in them combined with two aqueous protons to form water at the oxide-water interface. Cobalt behavior on the fuel rod surface under BWR conditions was discussed using the experimental results.

Subject
Water, Ions, Boiling water reactors, Adsorption, Dissolution, Rods, Hematite, Constants, Ion concentrations, Oxide surfaces, Cobalt, Ferrite, Chemical reactions
National Association of Corrosion Engineers
1988
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