This thesis was part of the MUZIC-2 collaboration and describes the effect of the water chemistry on
the corrosion and hydrogen pick-up in Zircaloy-4. Samples of Zircaloy-4 were oxidised in an
autoclave containing pure water at 360°C (pH360 = 6.15) and at 350°C in an elevated pH (pH350 =
8.82, with 50% deuterated water) compared to commercial reactors. They were examined by scanning
transmission electron microscopy (STEM), Thermal Desorption Spectroscopy (TDS) and Secondary
Ion Mass Spectroscopy (SIMS).