Oxygen influence on water chemistry and steel corrosion in its injection in the low temperature part of the condensate/feed train of NPS with a RBMK-1000 reactor

Injection of gaseous oxygen in condensate reduces steel corrosion. However, the information is lacking on possible influence of oxygen on the corrosion of steels with different chrome content and water iron concentration in the low-temperature part of the condensate/feedwater train of NPS with a RBMK-1000 reactor. A 1600 h.test experiment was carried out at the Leningrad NPS with water oxygen concentration of 200 mg/kg, and conductivity not higher than 0.2 ms/cm. All the steels tested demonstrated the 10-fold reduction of corrosion and release of corrosion products into water. The 2.5% chrome alloying of steel results in strong reduction (in respect to steel 20) of corrosion product release. (author)