Water chemistry challenges and R&D guidelines for water cooled systems of DEMO PbLi breeder blaket

The aim of this section is to present work done by participants of R&D sub-topics on water chemistry and corrosion study under the EU DEMO Water Cooled Lithium Lead Breeding Blanket (WCLL BB) project. The selection of light water reactor (LWR) water chemistry would enable the exploitation of valuable existing knowledge from the global LWR fleet in terms of water quality conditioning, control, and purification technologies. However, some specific parameters of the DEMO plant, such as the water radiolysis induced by 14 MeV neutrons, the rapid plasma burning and dwell cycle, presence of tritium in the coolant, and an unknown effect of the very high magnetic fields (4–8 T) required to confine the plasma, may have significant effects on the water chemistry, and needs to be considered during the design phase. (author)