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The paper looks at improving the uncertainty analysis in ISO 5198 and examines the conditions under which the equation to evaluate the uncertainty in ef ciency in the paper by M ilne holds good. An alternative to evaluating the uncertainty of pump ef ciency is described in detail in this paper. After comparing the factors that in uence the uncertainty of ef ciency, the paper determines the factors that can be neglected and presents measures to reduce the uncertainty in ef ciency in pump ef ciency testing. Keywords: pump ef ciency, thermodynamic method, uncertainty analysis NOTATION a isothermal coef cient (m 3 /kg) c speci c heat (J/kg K ) e speci c energy (J/kg) h enthalpy (J/kg) p pressure (Pa) q heat ux (W/m 2 ) Q volume owrate (m 3 /s) s entropy (J/kg) t temperature ( 8C) T temperature (K ) Dt temperature difference ( 8C) v speci c volume (m 3 /kg) V velocity (m/s) w work per unit mass (J/kg) Z elevation (m) a v volume expansivity (K G ) d uncertainty Z ef ciency

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The approach in uprating the AP1000 to the CAP1400 was to increase the power capability of the plant while retaing the creadibility of proven components and substantial safety margins. Therefore, the CAP1400 retains the AP1000 licensing basis. A comparison of the CAP1400 major design with the AP1000 is provided in Tab. 1.