[en] The work performed from May 1980 through March 1981 is described. EUV diagnostic studies have been performed at the Alcator A, Alcator C and TFR 600 tokamaks and on TMX. The central molybdenum concentration in Alcator C has been shown to be much lower than that in Alcator A. Impurity concentration and radiative power losses have been determined in the center cell of TMX. A grazing incidence spectrograph with 1024 detector elements is under construction