This publication focuses on the storage of spent nuclear fuel from power reactors, which is a topic of increasing importance to Member States. To support their needs, the IAEA has carried out successive coordinated research projects on spent fuel performance and the behaviour of spent fuel assemblies in storage since the 1980s. The findings of these projects have been reported in a series of publications over the past 30 years. The current publication consolidates these findings and compiles all relevant information in one referenceable source. The technical information provided in this publication will be particularly useful for experts engaged in safety assessments.