Stress corrosion cracking, oxidation and high temperature aqueous corrosion are life limiting factors in many nuclear process plant components. An Imaging Autoclave has been developed to study these processes, in-situ. The system combines refreshed-loop high temperature and pressure aqueous testing facilities under dynamic loading, with the optical techniques of Digital Image Correlation and Raman Spectroscopy. This paper reports an in-situ study of stress corrosion crack nucleation and growt...