A 700 MW steam turbine has steam inlet conditions, 3500 psia, and 1000 F / 1000 F. The utbine is a tandem compound six flow and has 30 inches last-stage blade length. At a condenser pressure of 2.5 in. Hg abs. the turbine net heat rate is given by

NHR = 87,000(NKW/1000)^4 - 178,600(NKW/1000)^3 + 138,600(NKW/1000)^2 - 49,400(NKW/1000) + 14,650

where NHR = turbine net heat rate (Btu/kWh) and NKW = turbine net output (MW). Calculate the present worth of lifetime fuel cost for this turbine system. Assume that the boiler efficiency is 92% and plant auxilliary power is 7%. The average turbine loading pattern during the entire plant economic life is approximated by

The economic factors are as seen below

Plant economic life = 35 years Rate of return = 10% Annual fixed charge rate = 15% First year fuel cost = $1.31/MBtu Fuel Cost Escalation rate = 5%