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The results of experimental studies of the solubility of boric acid in steam in the concentration range of 16-440 g/kg H2O and the pressure range of 0.1-0.3 MPa is considered in the article. An analysis of the literature data on the solubility of boric acid in steam showed that the results do not cover the entire range of parameters (temperature, pressure, concentration of boric acid) typical of a possible emergency situation at NNPs with the WWER. In paper the test facility is described. The obtained experimental results confirm the data available in the literature that the change in the concentration of boric acid in steam is described by a linear law. The range of application of the dependence of the distribution of H3BO3 between the liquid and steam phases of the boiling coolant has been expanded to a concentration of 440 g/kg H2O, which is close to the solubility limit of boric acid in water at a pressure of 0.3 MPa. The obtained experimental data can be used in the calculating of the emergency at nuclear power plants with WWER, taking into account the operating of passive safety systems.

EXPERIMENTAL STUDY OF THE FEATURES OF PROCESS OF SOLUBILITY OF BORIC ACID IN STEAM DURING OF BOILING OF THE COOLANT OF THE WWER IN CASE OF ACCIDENT