This report describes the index of nuclear explosions, designed at the Research Institute of Swedish National Defence. The index is run on a computer with the information retrieval system CORSAIR*, developed at the Research Institute. Searches and input in the about 900 references (February 1974) via teminal are made by using ISIS (Integrated Scientific Information System). The report also includes users guidance, both concerning the handling of the terminal and the filling up of forms to update the index. The system is run on a computer type IBM 360/75. *CORSAIR is an acronym for Computer Oriented Reference System for Automatic Information Retrieval.