Boric acid in the heat transfer agent of the primary coolant circuit of NPP.
Dissociation of boric acid is considered. It is shown that it possesses the properties of a Lewis acid. The dependence of the amount of dissociated forms on рН for ortho- and tetraboric acids is constructed. It is stated, that the dominant ion in the heat transfer agent of the primary coolant circuit is [В(ОН)<sub>4</sub>]<sup>-</sup>.