POSITRON ANNIHILATION STUDY ON RPV STEEL SPECIMENS

Vladimír Slugeň et al

   The annealing behaviour of eight commonly used nuclear reactor pressure vessel steels was studied using the positron annihilation lifetime technique. Isochronal annealings of 30 minutes duration between the room temperature and 700 ^oC (steps of 50 ^oC and 25 ^oC in the most interesting region) were performed in vacuum. The interpretation of the experimental positron-lifetime results is neither easy nor straightforward. However, there are observable differences in the mean lifetimes not only between the Russian and western types of steels but also between single specimens within these two groups.

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