Use of Amines for Adjusting the Second-Loop Chemical Regime in NPPs with VVER

Abstract

One of the operational problems of NPP with VVER is equipment corrosion in the second loop. Different water-chemical regimes are used to lower the corrosion rate. Data on the iron concentration in the feed water and the formation of deposits in the steam-generator in different water-chemistry regimes (hydrazineammonia, ethanolamine, morpholamine) are presented. It is noted that a regime with ethanolamine and ammonia dosing is promising. The results of laboratory experiments whose aim was to study the effect of ethanolamine on the cationite volume capacity are presented. It is found that the volume capacity of recycled cationites remains almost unchanged, but the presence of ethanolamine decreases it by approximately 11%.