This guidebook is a revised version of Technical Reports Series No. 240, published in 1984. It provides a summary of the experience and information in many areas related to spent fuel storage. It will allow a better understanding of the many problems involved and permit countries that are planning for or operating nuclear power reactors to review the issues in a more informative manner. In view of the large quantity of spent fuel discharged from nuclear power plants, long term storage is currently the primary option for the management of spent fuel. The proven wet storage concept is expected to continue to be used in the future. The design and the technological, economic and material problems of safe spent fuel storage will remain a focus of attention, with particular emphasis on dry storage technology, rod consolidation and other advanced concepts. Contents: 1. Introduction; 2. Spent fuel storage technology; 3. Transport of spent fuel; 4. Economics of spent fuel storage; 5. Regulatory, institutional and safety aspects; 6. International safeguards; 7. Factors used in evaluating spent fuel storage options; 8. International co-operation; Annex A: AFR storage facility Clab, Sweden; Annex B: Development of AFR storage design in the USSR; Annex C: Spent fuel storage in the Federal Republic of Germany; Annex D: United States horizontal concrete dry storage system; Annex E: Canadian experience with the dry storage of used CANDU fuel; Annex F: United States dry cask storage experience; Annex G: United States experience with spent fuel rod consolidation; Annex H: Fuel storage ponds at Sellafield, United Kingdom; Annex I: Acronyms and abbreviations; Annex J: Glossary.