It is shown, that the most perspective way of metal hydrides usage in gas supply systems of hydrogen-utilizing vacuum-plasma installations is the creation of multifunctional metal-hydride elements on the basis of hydride-forming materials ― reversible low-pressure hydrogen sorbents. These elements are the component parts of a working zone of a vacuum-chamber in consumer installation (e.g. the electrodes of a plasma-forming step). In so doing, apart from complex solution of auxiliary problems of hydrogen isotopes compact storage, their purification and controlled leak-in into the working space of an installation vacuum chamber, the installation autonomy as to its evacuation and gas supply is provided, as well as the working efficiency of the installation as a whole is increased. On the basis of the analysis of the features of metal hydride systems for hydrogen isotopes "internal" leak-in, the general principles of building-up such the systems are formulated.
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