Answer: The pump consumes some amount of work produced by the steam turbine so that it can increase the pressure of condensed steam and transfer it to the boiler.
The work that is consumed by the pump is only 1-2% of the work produced by the turbine. Hence, it is safe to neglect the pump work in the Rankine cycle in most cases.
#rankinecycle #steampower #powerplant #steam #thermodynamics