This is the second report that addresses results from the Co-ordinated Research Project on Irradiation Enhanced Degradation of Materials in Spent Fuel Storage Facilities. The first report is entitled Durability of Spent Nuclear Fuels and Storage Facility Components in Wet Storage, IAEA-TECDOC-1012. Because of the enhanced importance of wet storage, the scope of the first report was expanded to include both irradiated and unirradiated effects on fuels and facility materials. This second report addresses results of topical studies that are relevant to issues important to materials behaviour in wet storage technology but also involves topics on materials behaviour in dry storage and repository environments, including effects of radiation.