Tightness of hydrogen storage caverns in salt deposits.
Jarosław Ślizowski, Rafał Smulski, Stanisław Nagy, Stanisław Burliga, Krzysztof Polański
Vol. 34, no. 2 (2017), pp. 397-408, 
The problem of rock salt massif tightness concerns all stored media. It is particularly important in the case of hydrogen, because of the small size of its molecules. Preliminary results of selected permeability tests performed under the project Hestor are discussed in the paper. The results of numerical calculations determining a potential range of gas leakage are also presented.