Corrosion in a Supercritical Water-cooled Reactor - Developing a Mechanistic Framework

摘要

In the Canadian SCWR, the coolant temperature increases from 350 °C to 625 °C from core inletto outlet. The coolant properties change significantly over this temperature range, especiallynear the critical point. Data suggest different corrosion mechanisms occur in high-density subcriticalear-critical water and in low-density SCW, highlighting the need for a mechanisticframework within which to interpret the data. This paper explores the relationship betweenenvironmental parameters and corrosion mechanisms in an SCWR core and importance ofunderstanding surface rather than bulk conditions. The implications of this work on selectionand testing of materials, corrosion mitigation strategies, chemistry and corrosion monitoring arediscussed.