METHOD AND APPARATUS FOR DETECTING DEFICIENT PART OF PELLET

摘要

PURPOSE:To enhance working efficiency, by irradiating a fuel rod with X-rays in the radius direction while said fuel rod is rotated around the axial line thereof and projecting the X-rays transmitting through the fuel rod on an X-ray screen and judging the deficient part of a pellet based on the density of the obtained image. CONSTITUTION:A fuel rod 3 is fed to a detection part while rotated on a plurality of the rollers 14 of a feed mechanism 13 and irradiated with X-rays in the radius direction thereof from an X-ray generating tube 15 in the detection part and the X-rays transmitting through the fuel rod 3 are projected on an X-ray screen 16 and further incident to a video camera 17 through a mirror 19 and the image signal of a transmit ted image is supplied to an image processing part 18. When the fuel rod 3 is irradiated with X-rays, X-rays are hard to transmit through the part of a pellet 2 and the trans mitted image obtained by the camera 17 becomes black at the part of the pellet 2 and the other part becomes gray. Therefore, the deficient part of the pellet 2 is judged on the basis of the density of the transmitted image obtained by the camera 17 by the image processing part 18 and the fuel rod judged as an inferior product is dis charged to an inferior product yard. By this method, working efficiency can be en hanced.