Effect of Supercritical Water Composition on the Corrosion of Engineering Materials
34th Annual CNS Conference - 2013 June 09-12


Presented at:
34th Annual CNS Conference
2013 June 09-12
Location:
Toronto, Canada
Session Title:
Chemistry & Materials

Authors:
Peter McClure (Carleton University)
Muzammil Mehdi (Carleton University)
Xiao Huang (Carleton University)
Dave Guzonas (AECL)
  

Abstract

Canada is a major partner in the development of a next generation (GEN-IV) supercritical heavy water nuclear reactor (SCWR). The proposed SCWR uses supercritical water (SCW) as a working fluid in the primary heat transfer (PHT) system to take advantage of its single phase and high thermal efficiency. SCW has an extremely corrosive nature that must be considered in selecting engineering materials for the PHT system. This paper discusses the effect of the SCW composition on the corrosion of various candidate materials.

In order to understand the corrosive behaviour of SCW, its physical and chemical properties are discussed. The effects of density, dielectric constant, pH value, dissolved oxygen content, and presence of inorganic compounds and acids on corrosion are described. The impact of temperature and pressure on these properties is also considered, with discussions of how they can be used to “tune” the SCW to limit corrosion.

 

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