naa a22 4500 510761437 CHVBK 20180411083140.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1134/S0040601513070045 doi (NATIONALLICENCE)springer-10.1134/S0040601513070045 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 [Elektronische Daten] [A. Gavrilov, V. Kritskii, Yu. Rodionov, I. Berezina] 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. Pleiades Publishing, Ltd., 2013 pressure drop nationallicence boric acid nationallicence deposits of corrosion products nationallicence iron borates nationallicence mass transfer nationallicence VVER-440 reactor nationallicence Gavrilov A. Head Institute VNIPIET, ul. Savushkina 82, 197183, St. Petersburg, Russia aut Kritskii V. Head Institute VNIPIET, ul. Savushkina 82, 197183, St. Petersburg, Russia aut Rodionov Yu Head Institute VNIPIET, ul. Savushkina 82, 197183, St. Petersburg, Russia aut Berezina I. Head Institute VNIPIET, ul. Savushkina 82, 197183, St. Petersburg, Russia aut Thermal Engineering SP MAIK Nauka/Interperiodica 60/7(2013-07-01), 482-486 0040-6015 60:7<482 2013 60 11509 https://doi.org/10.1134/S0040601513070045 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0040601513070045 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gavrilov A. Head Institute VNIPIET, ul. Savushkina 82, 197183, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Kritskii V. Head Institute VNIPIET, ul. Savushkina 82, 197183, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Rodionov Yu Head Institute VNIPIET, ul. Savushkina 82, 197183, St. Petersburg, Russia aut NATIONALLICENCE 700 1- Berezina I. Head Institute VNIPIET, ul. Savushkina 82, 197183, St. Petersburg, Russia aut NATIONALLICENCE 773 0- Thermal Engineering SP MAIK Nauka/Interperiodica 60/7(2013-07-01), 482-486 0040-6015 60:7<482 2013 60 11509 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer