Influence of the Impeller/Guide Vane Clearance Ratio on the Performances of a Nuclear Reactor Coolant Pump

An AP1000 nuclear reactor coolant pump is considered to assess the influence of Impeller/Guide vane clearance on performances this type pumps. Experiments and numerical simulations relying an unidirectional fluid-solid coupling approach are used investigate problem (stress, strain mode rotor). The results reveal relationship existing between hydraulic performance ratio. effect ratio maximum equivalent stress back surface impeller blade greater than that working (the about three times surface). has a scarce first six natural frequencies rotor pump. related vibrational modes have different waveforms.