Modeling of corrosion products migration in the secondary circuit of NPP with VVER-1200

International Conference on Nuclear Chemistry

December 08-09, 2016 San Antonio, USA

Gavrilov Anton Vladimirovich, V G Kritsky, I G Berezina, E A Motkova and N A Prokhorov

Atomproekt, Russia

Posters & Accepted Abstracts: J Nucl Med Radiat Ther

Abstract :

Models describing the distribution of concentrations of ethanolamine and ammonia, �?�?Н values, corrosion and mass transfer of corrosion products in the secondary circuit of NPPs with VVER-1200 are presented in this work. These models are used to develop computational codes. Calculation of mass transfer and distribution of corrosion products on various flows of the secondary circuit working environment is made by using the physico-chemical model of mass transfer of corrosion products in which the secondary circuit is considered as a cyclic system consists of several interconnected elements. The circuit was divided on calculated parts, where the change of parameters (flow, temperature, pressure) was traced and the rate, of corrosion and corrosion products transport, the value of high temperature pH and concentration of iron calculated were calculated. Verification of the models is made by using the results of chemical analyses on operating nuclear power plant since its start-up and the concentrations of iron corrosion products in feed-water for various NPP depending on pH at 25�?°C. The calculations results of the parameters of the corrosion and corrosion products mass transfer showed that the model allows to the designer to decide what is more profitable for some parts of the circuit: the concentration increase of corrective agents, the use of steel with a high content of chromium or the periodic cleaning of the steam generator from the crud.

Biography :

Email: AVGavrilov@atomproekt.com