The collected papers have recently been published of the third seminar on practical decommissioning experience with nuclear installations in the European Community, which took place at Gundremmingen/Gunzberg in Germany, and was jointly organized by Kernkraftwerke RWE Bayernwerk GmbH and the Commission of the European Communities. The meeting aimed at gathering a limited number of European experts for the presentation and discussion of operations and the results and conclusions on techniques and procedures presently applied in the dismantling of large-scale nuclear installations in the Community. It was attended by managers involved with the decommissioning of nuclear reactors in the Community, either at the level of practical dismantling work or in the decision-making stage. Besides the four pilot dismantling projects in the context of the current specific RTD programme (Euratom) in the field of decommissioning of nuclear installations, 1989-1993, which comprise WAGR, BR-3 PWR, KRB-A BWR and AT-1 FBR fuel reprocessing, the organizers also selected presentations on topics related to facilities of a significant scale and/or having specific representative features: - The Magnox reprocessing pilot plant at Sellafield; - The HWGCR EL4 at Monts d'Arree; - Operation of an on-site melting furnace for G2/G3 dismantling waste at Marcoule; - An EdF confinement conception of LWR shutdown for deferred dismantling; - The technical aspects of the Greifswald WWER type NPPs decommissioning; - The decommissioning of material testing reactors in the United Kingdom; - An overview of the conception and implementation of two Community databases on tools, costs and work dosages. It is hoped that the seminar and the collected papers will contribute to the achievement of dismantling tasks under optimal conditions, with regard to both safety and economic aspects, by making available a complete and updated examination of ongoing dismantling projects and by providing an appropriate basis for discussion.