  The granular nanoporous carbon medium, made of the cylindrical coal granules
of the adsorbent of SKT 3, at an influence by the high pressures from 1MPa to
3GPa has been researched. The eight consecutive stages of the materials
specific volume change, which is characterized by a certain dependence of the
volume change on the pressure change, have been registered. It is shown that
there is a linear dependence on the double log log plot of the materials
specific volume change on the pressure for an every stage of considered
process. The two stages are clearly distinguished such as a stage of materials
mechanical destruction, and a stage of elastic compression of material without
the disintegration of structure at a nanscale. The hysteresis dependence of the
materials specific volume change on the pressure change at the pressure
decrease is observed. The small disperse coal dust particles jettisoning
between the high pressure cell and the base plate was observed, resulting in
the elastic stress reduction in relation to the small disperse coal dust
particles volume. The obtained research data can be used to improve the designs
of air filters for the radioactive chemical elements absorption at the NPP with
the aims to protect the environment.
