The partners of the NFE project (Nukleare Fernenergie) -Kernforschungsanlage Jülich GmbH und Rheinische Braunkohlenwerke AG- have investigated variousproblems of the methanation of synthesis gas in order to improve the "Long Distance Nuclear Energy System" . In a test run with the pilot plant ADAM I - February 1980 - the partners of the NFE project, in collaboration with Haldor Topsoe A/S, could obtain important results with regard to the high temperature methanation up to 7oo °C, to a closed steam reforming - methanation circuit and to the operation of a recycle ejector in ADAM I to limit the outlet temperature of the first reactor