COMPARISON Of IRRADIATION DAMAGE IN ARTIFICIAL AND NATURAL GRAPHITE AT DIFFERENTIRRADIATION TEMPERATURES. Results of irradiation experiments on artificial and natural graphite in the three temperature ranges 70 - 150°C, 300 - 400°C and 550 - 650°C are compared. These irradiation experiments were carried out in core or pool positions of tbe GETR. Vallecitos. The samples investigated received neutron doses up to 5x1021 nvt with E > 0.17 eV, which is approximately 3X1O21 nvt with E > 0.18 MeV. Changes in the lattice parameters. the electric and thermal conductivity, the macroscopic dimensions and the bending strength are discussed. The natural graphite samples investigated were manufactured partly with, partly without a binding material. The results obtained during these investigations indicate, in addition to the dependence on the irradiation temperature and the neutron dose, a strong influence exerted by tbe basic materials, the treatment during production and the density. Strong anisotropic effects in natural graphite at lower irradiation temperatures, resulting from the treatment during production, level out at higher irradiation temperatures
