There are various way to introduce high temperature electrolysis into the nuclear power steam cycle, the most optimal solution being to dry the steam from moist when steam is additionally heated (see Fig. \ref{424195}). However, since this solution requires the original steam cycle to be modified and may change the operation of the steam turbine (LP part), we decided to analyze almost non invading concept of placing the high temperature electolyzer in the deaerator steam inlet stream. Thus no modification will be required for the steam cycle.