Evaporation of sodium from components using heat and vacuum was investigated as a method of sodium removal from liquid-metal fast breeder reactor components. The method was determined to be capable of efficiently cleaning components at temperatures as low as 260 to 315°C and at pressures of ∼1 × 10−3 to 1 × 10−4 Pa. The most rapid cleaning was observed with small crevices, where the sodium is expelled by gases released from the sodium. The method was recommended as a viable process that should be investigated using full-size components.