Safeguards inspection on spent fuel bundles stored in Wolsong spent fuel pond by using the underwater camera

National and international safeguards inspectors have been doing safeguards inspections periodically on the spent fuel bundles stored in the spent fuel pond of Wolsong nuclear power plant by applying the item counting (method K) and the NDA verification (Method H). As an inspector inserted the sensor of the safeguards equipment between the stacked trays, he confirmed the number of spent fuel bundles stacked on row or column randomly selected. But, it appeared that the stacked trays and the structure materials of the ultrasonic bolt seal prevented the equipment's sensor from approaching the fuel bundle. In order to verify the spent fuel bundles effectively, it is necessary to develop the new safeguards equipment to solve these problems. This paper showed the design concept to develop this new equipment and whether this equipment will be applied for safeguards goals or not