Development on CANDU spent fuel counting system by using the ultrasonic sensor

The CANDU Spent fuel counting system by using the ultrasonic sensor was developed in order to verify the quantity of spent fuels stored into the pond. As it is moving up and down between fuel bundles, the ultrasonic sensor sends signals and receives the signal reflected from the spent fuels. In order to confirm the number of fuel bundles at any column of 16 or 19 trays stacked in the pond, this concept was applied. Agency inspector asked the operators to move the trays stacked and confirmed these for physical inventory verification. But, it is overburdening the facility on the side of fuel management. The new equipment designed for this purpose was tested in Wolsong for its performance. And it was evaluated that it is able to meet the IAEA's criteria to confirm the quantity of spent fuels. TCNC has the plan to improve for routine use and then propose the IAEA for its joint use