• some features of the effect the ph value and the physicochemical properties of boric acid have on mass transfer in a vver reactor’s core

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 828
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     certain features of the effect of boric acid in the reactor coolant of nuclear power installations equipped with a vver-440 reactor on mass transfer in the reactor core are considered. it is determined that formation of boric acid polyborate complexes begins under field conditions at a temperature of 300°c when the boric acid concentration is equal to around 0.065 mol/l (4 g/l). operations for decontaminating the reactor coolant system entail a growth of corrosion product concentration in the coolant, which gives rise to formation of iron borates in the zones where subcooled boiling of coolant takes place and to the effect of axial offset anomalies. a model for simulating variation of pressure drop in a vver-440 reactor’s core that has invariable parameters during the entire fuel campaign is developed by additionally taking into account the concentrations of boric acid polyborate complexes and the quantity of corrosion products (fe, ni) represented by the ratio of their solubilities.

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