decis fix date euratom suppli agenc duti approv agenc rule determin manner demand balanc suppli or sourc materi special fissil materi commiss european atom energi commun regard treati establish european atom energi commun articl thereof commiss fix date suppli agenc duti devolv treati introduct procedur laid agenc implement sixth paragraph articl treati necessarili entail transit measur facilit progress applic decid articl date suppli agenc duti devolv treati june articl approv agenc rule determin manner demand balanc suppli or sourc materi special fissil materi articl rule refer articl enter forc entireti june contract cover suppli special fissil materi contract suppli or sourc materi implement articl rule defer month date entri forc laid paragraph articl articl contract relat suppli or raw materi period submit commiss prior approv period month market survei conduct complet procedur laid articl rule articl decis appli euratom suppli agenc user produc or raw materi special fissil materi brussel commiss sassen