council decis march approv conclus commiss agreement cooper european atom energi commun repres commiss depart energi unit state america field fusion energi research develop euratom council european union regard treati establish european atom energi commun articl paragraph thereof regard propos commiss agreement cooper peac nuclear energi european atom energi commun unit state america sign brussel novemb march cooper nuclear research develop includ research control thermonuclear fusion commiss accord council direct april conduct negoti agreement cooper european atom energi commun repres commiss depart energi unit state america field fusion energi research develop conclus commiss agreement approv decid sole articl conclus commiss behalf commun agreement cooper european atom energi commun depart energi unit state america field fusion energi research develop approv text agreement annex decis brussel march council presid larsson oj page offici journal