Okay, lets use real numbers from a real Westinghouse US four loop Plant.
WBN-1, May 96
Power 1246 MWe
Flow 144,000,000 LBM/Hour = 288,461.5 GPM/ 4 Loops = 72,115 GPM/Loop
Motor KW = 5850
Pump Eff = .73
Motor Eff = .91
.7457 = conversion KW to HP
3960 = conversion of FT- LB/Sec through HP and seconds to Minutes
Pump curve point is determined from initial design curve (with original S/G's and pump seals installed)
Pump Head = 3,960* (.73) * (.91) * 5850 KW (Reference Camerons hydraulics Chapter 1-18th Edition)
72,115 GPM * (.95) * (.7457)
= 15,389,173.8
51,087.6
= 301.23 Feet (Water column) Note 2.26 Feet of Water Column = 1 PSI
Thus 301.23 Feet/2.26 Feet/PSI = 133.2 PSI Differential head across the pump (Calculated Point)
Reference (Displayed as 125 on westinghouse P2500 computer).
This exercise that the student was asking about is not an NRC test about the FSAR, it is about how do you get the numbers that are in the design background for the plant and what do they mean. Any one can do this same one point steady state approach at their plant using their known equipment ratings, flows and KW of the system.
This is how it works, the why, behind the numbers that are read in the control room and in the technical manuals. Granted this takes some basic liberties by ignoring transient analysis, but for a 1 point assessment of an steady state operating condition these are the basics of how you approach the solution. That was what was asked initially and answered to stay on topic. (By the way I have the numbers from this time frame because I downloaded them from the P2500 and verified them on the Eagle 21 system during full unit surveillances during initial startup and full power testing).