The chemical reactions of Na-Fe-O
2-H
2O system and their equilibrium constants (600∼1200 K) were expressed in terms of standard equilibrium O
2 pressure
P0 and standard potential
E0. The results were graphically illustrated on the equilibrium daiagrams of log
P(O2)(O
2 partial pressure) vs. log(Na
2O)(basicity) or
E(potential) vs. log(O
2−)(basicity). These daiagrams visually and comprehensively show the equilibrium relations in the reactions among molten Na with O
2, H
2O and Fe with their reaction products and give a useful information for analysis of the leakage incident of sodium from the fast breeder reactor of “Monjyu”.
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