[en] Steady-state pump performance was measured on a one-third-scale model reactor coolant pump in an air-water test loop where temperatures varied from 58 to 118⁰F, pressures ranged from 5 to 95 psig, water flow rates varied from 650 to 9000 gpm, and air flow rates ranged from 0 to 4000 scfm. Various air-water mixtures between 0 and 90% void fraction were supplied to the test pump for locked-rotor, free wheeling, and powered operation. The test data comprise 862 steady-state operating conditions with 522 test points recorded for pump operation in the first quadrant. Homologous pump performance data have been calculated with a digital computer code, WAPMP, which is listed ahead of the test data