This book presents a critical review of designing, siting, constructing and demonstrating the safety and environmental impact of deep repositories for radioactive wastes. It is structured to provide a broad perspective of this multi-faceted, multi-disciplinary topic: providing enough detail for a non-specialist to understand the fundamental principles involved and with extensive references to sources of more detailed information. Emphasis is very much on deep geological disposal at least some tens of metres below land surface and, in many cases, many hundred of metres deep. Additionally, only radioactive wastes are considered directly even though such wastes often contain also significant chemotoxic or otherwise hazardous components. Many of the principles involved are generally applicable to other repository options (e.g. near-surface or on-surface disposal) and, indeed, to other types of hazardous waste. * Presents a current critical review in designing, siting, constructing and demonsrating the safety and environmental impact of deep repositories for radwaste * Addresses the fundamental principles of radioactive waste with up-to-date examples and real-world case studies * Written for a multi-disciplinary audience, with an appropriate level of detail to allow a non-specialist to understand.