On 14 January 1956, the Spaak Committee working party responsible for studying the problems associated with the construction of a European factory for separating uranium isotopes submits a report in which the experts on nuclear power from each Member State analyse the role of uranium 235, the progress of isotope separation techniques, their economic evaluation and the possibility of establishing a common studies organisation.

On 5 September 1956, the representatives of the six countries participating in the Intergovernmental Conference on the Common Market and Euratom at the Château de Val Duchesse sign the Statutes of the study group on the establishment of a European factory for separating uranium isotopes.

On 13 December 1956, the French Delegation to the Intergovernmental Conference on the Common Market and Euratom forwards a memorandum to the Committee of Heads of Delegation in which it emphasises that the establishment of a European factory for separating uranium isotopes is both necessary and a matter of urgency.

On 22 January 1957, the Executive Committee of the study group for the establishment of a European factory for separating uranium isotopes presents its interim report which emphasises the great advances that have been made in nuclear research in the six founding countries of the future European Atomic Energy Community (EAEC or Euratom) and sets out the conditions for the supply of certain amounts of enriched uranium by the United States.

On 28 January 1957, the French Delegation to the Intergovernmental Conference on the Common Market and Euratom proposes that the six Member States of the future European Atomic Energy Community (EAEC or Euratom) establish a European factory for separating uranium isotopes.

On 4 February 1957, the Foreign Ministers of the six countries participating in the Intergovernmental Conference on the Common Market and Euratom at the Château de Val Duchesse instruct the study group on the establishment of a European factory for separating uranium isotopes to draw up a report within three months on the feasibility of the establishment of such a factory.

On 21 January 1956, commenting on the diplomatic negotiations under way in Brussels and the recent Joint Declaration of the Action Committee for the United States of Europe (ACUSE) on Euratom, the daily newspaper La Libre Belgique warns its readers of the risks posed by the tendency towards European supranationalism and insists that Belgium should not give up the political and scientific benefits that it derives from the uranium produced in the Belgian Congo.

In January 1957, in the Brussels journal Synthèses, Jean-Pierre Paulus de Chatelet, Chairman of the Special Committee of Katanga (CSK), describes the implications of the establishment of Euratom for Belgium, given the quantities of natural uranium mined in the Belgian Congo.