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Ingress of iron oxides into the steam generator (SG) leads to tube fouling and a reduction of heat transfer capacity. This results in reduced SG efficiency and therefore, reduced power generation. Accumulation of deposits in crevices may also cause a blockage of the tube support channels, impeding the free passage of water-steam, potentially causing undesirable vibrations in the tube bundle. These deposits in crevices, especially at the tube-to-tubesheet interface, might also create tube denting due to the increased volume of iron oxides in the gaps. This increases the risk of tube damage enhanced by mechanical stress (stress corrosion cracking). In combination with detrimental substances enriched in those deposits other corrosion mechanisms could be induced.

The Steam Generator Chemical Cleaning Process efficiently removes the accumulated deposit inventory of the SG.
CUstomers can select complete “curative” cleaning or partial “maintenance” cleaning levels. SG chemical cleaning is an essential part of SG asset management. It ensures long-term performance and reliable operation of nuclear SGs. The chemical cleaning process is applied either during plant shutdown or during outage. The modular chemical cleaning system is positioned outside the reactor building and connected to the plant system by hoses.

Your benefits

  • Restores heat transfer capacity
  • Reduces risk of tube failures
  • Increases steam pressure
  • Minimizes SG level fluctuations
  • Increases plant efficiency and electric power generation
  • Extends SG lifetime

Interested in Steam Generator Chemical Cleaning?

Andreas Drexler, Steffen Weiss, Neil Caris, Christoph Stiepani
AREVA’s toolbox for long-term best performance and reliable operation of nuclear steam generators
Symposium on Water Chemistry and Corrosion in Nuclear Power Plants in Asia – 2015, September 2-4, 2015, Anupuram, India

AREVA NP Germany
CANDU Reactors VVER Reactors CANDO VVER Westinghouse