Investigation Of Corrosion Degradation Of A Tube Sheet In Steam Generators In Nuclear Power Plants With Vver Reactors

摘要

Measures for ensuring reliable and safe operation of a tube sheet in the steam generators in nuclear power plants with VVER reactors are examined and validated. The reasons for and mechanisms of the damage occurring to the tube sheets in steam generators are examined. The results of experimental studies evaluating the corrosion effect of the working medium in the second loop on the tube sheet are presented and it is shown that the defects detected by eddy-current monitoring form predominately in the startup and nonstationary operating regimes of steam generators as well as during disruptions of the water-chemistry regime. Suggestions are made for optimizing the water-chemistry regime of the second loop and for preserving a steam generator during downtime.