Assessment of the effect of repair of the secondary circuit with austenitic overlay on the erosion-corrosion and corrosion damage

Damage of carbon steel components in the environment of the flowing secondary circuit medium poses a safety risk to the NPP operation. The report summarizes initial results of modelling the sensitivity of the piping behind the component with austenitic overlay with a view to quantifying acceleration of the erosion corrosion process. Microstructural analysis was applied, concentrating on the transition region between the base material and the overlay. Corrosion tests were aimed at examining the sensitivity of the various materials and their combinations to corrosion. The samples were evaluated by using metallographic and gravimetric methods. (author). 6 tabs., 72 figs., 9 graphs