Hydrogen presence in steam means a possibility to obtain slightly faster flow.
The addition of hydrogen into steam does not change the thermodynamic properties of working fluid from the turbomachinery point of view.

Using a condenser/deaerator to separate hydrogen

Hydrogen can be separated from the  steam with a condenser or deaerator, which are elements of the steam cycle. During normal operation of a condenser/deaerator, hydrogen can be separated by in situ installed ejectors/vacuum pumps or by releasing with steam. Pure hydrogen cannot be separated in this way, rather a mixture of hydrogen and steam with  H2:H2O proportions of roughly 54:46. This way, we can obtain the hydrogen/steam mixture at different pressure levels: relatively low pressure (0.05 bar) and low temperature (20\(^{\circ}\)C) in the case of a condenser or even up to 30 bar in the case of a deaerator, but at elevated temperature. Cleaning and compressing the hydrogen are the issues here.