Abstract
The electro-void fraction meter (Capacitance type meter) was applied to higher pressure conditions of 18MPa than BWR operating conditions of 7MPa. The void fraction measurement system has been developed including the electrodes of void fraction measurement, instrumentation cables with mineral insulation and simplified electric circuit to provide good signal-to-noise ratio. It satisfied the performance of thermal and pressure resistance and electric insulating capacity. Calibration function for high temperature and high pressure conditions was confirmed through calibration test with 37-rod bundle against datum 19-rod bundle by the quick-shut valve method respectively under 2MPa conditions. It was confirmed that the measured data were consistent with those measured by the quick-shut valve method.
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