Abstract
In this work the results of hydrogen release invesfigations from beryllium samples of EHP-56 grade depending on irradiation and hydrogen loading conditions are submitted. It is shown, that the inerease of hydrogen retention in the beryllium samples oceurs only at the temperatures about 1100 K under the influence of reactor irradiation with high flux density. The effect of simultaneous influence of radiation and exposure to molecular hydrogen, observed in the experiments, depends on the flux density, not on the fluence. The data of electron microscopy have shown, that on the surface of beryllium samples, irradiated in hydrogen atmosphere in a high flux reactor, an active microcracks formation takes place and there is a greater amount of oxide, than on control samples.