The objective of this report is to provide an overview of factors relevant to the identification of cleanup requirements and to the choice of a decommissioning option for a severely damaged nuclear power plant. It proposes a methodology for the evaluation of various options and the selection of appropriate action in a particular accident situation. Contents: 1. Introduction; 2. Management after a severe reactor accident; 3. Factors relevant to cleanup and decommissioning after a severe accident; 4. Strategy for cleanup; 5. Strategy for decommissioning; 6. Methodology for selection of the preferred decommissioning option; 7. Conclusions and recommendations; Annex A: Review of four accidents.