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Conductance-type void fraction meter is a practical void fraction meter. It can apply to various test section (Round flow path, rectangular flow path, and rod bundle with squire lattice or triangular lattice). The principle of the meter is based on the fact that the electrical conductance changes with the change of void fraction in gas-liquid two-phase flow. According to air/water two-phase flow experiment, it was confirmed that void fraction α could be obtained by measuring I/Io (Io is current at α=0). The relation between α and I/Io agreed with Maxwell's equation. The void fraction meter can be applied to high temperature/high pressure condition (290℃, 7MPa), by taking account of temperature dependency of water specific conductance. It was succeeded to measure the void fraction of steam/water two-phase mixture in 2×2 bundle flow path in the range of 0%-60% under high temperature/high pressure condition.
