The steam cycle of a marine nuclear propulsion plant may be modeled as an ideal Rankine cycle.

a. Using the information provided below determine the enthalpy of the working substance in each state.

State 1: Feedwater temperature at the suction of the pump indicates the plant is operating efficiently with just 2 oF of condensate depression. Condensate depression is the amount of sub-cooling below Tsat at condensate pressure.
State 2: The feed pump discharge pressure is 600 psig.
State 3: The steam generator produces dry saturated steam at 600 psig.
State 4: Condenser vacuum is 28.54 in Hg.

b. Sketch the specified steam cycle on a T-s diagram

c. Determine the thermal efficiency of the specified steam cycle, when modeled as an ideal Rankine cycle.

d. Determine the efficiency of a Carnot steam cycle operating between the same hot and cold reservoirs.

e. Assuming the work of the feed pump and other auxiliary equipment is “small”, the work output of the propulsion plant is simply the sum of the propulsion power (34,000 SHP) and the electrical power generated (4 MW) when the plant is operated at full power. The thermal energy transferred from the reactor to the working fluid in this condition is 125 MW. Determine the overall efficiency of this propulsion plant.