Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
Differential pressure type water level gauges are generally used to measure a water level in a reactor pressure vessel (RPV), but they may not be able to measure a water level correctly in severe accident environments. Therefore, we are developing a Clamp-on Ultrasonic Water Level Measurement Method that can measure a water level in a RPV even under severe accident conditions. In this study, we measured water levels using Clamp-on Ultrasonic Water Level Measurement Method in the range of 0 to 28 cm water level using a small laboratory test apparatus. The measuring section was made of a metal plate with a wall thickness of 10 mm, and its materials were aluminum, stainless steel (SUS303), and carbon steel (SS400).Ultrasonic transducers have a resonant frequency of 2 MHz, and the angle of incidence of the transmitted wave was measured under two conditions. We confirmed that the trend and degree of change of the received signal according to the water level in the vessel for each vessel material and transmitted wave, and showed that the water level can be obtained accurately from the received signals.
