Part 1 Introduction: Multiple-barrier geological repository design and operation strategies; Spent nuclear fuel recycling practices and impacts; Near-surface, intermediate depth and borehole disposal; Underground research facilities and rock laboratories. Part 2 Geological repository systems: Crystalline systems; Clay systems; Assessing long-term stability; Far-field process analysis and radionuclide transport modelling. Part 3 Engineered barrier systems: Immobilisation of spent nuclear fuel and radioactive waste; Low-pH concretes; Smectitic buffer and backfill; Near-field processes, evolution and assessment; Nuclear waste canisters, corrosion and long-term performance; Post-containment performance. Part 4 Performance assessment: Safety assessment for deep geological disposal; Safety assessment for near-surface disposal; Treatment of uncertainty in the performance assessment; Assessment of expert judgments; Knowledge management systems. Part 5 Radiation protection, regulation and social engagement: Radiation protection principles and standards; Risk-informed, performance-based regulations; Environmental monitoring programs and public engagement; Methods for social dialogue.