Apparatus for measuring outer diameters of fuel rods of nuclear fuel assembly

摘要

Provided is an apparatus for measuring outer diameters of fuel rods of a nuclear fuel assembly, in which the fuel rods are standing upright and are used in a light water reactor. The apparatus includes a support unit fixed to a floor at a lower portion thereof so as to be kept insulated from vibrations caused by external forces, a measuring unit mounted on the support unit and moving up and down to measure the outer diameters of the fuel rods, and a transducer cooperating with the measuring unit, converting the measured outer diameters of the fuel rods into electrical signals, and sending the converted signals to the outside. Thus, the apparatus moves up and down to measure the outer diameters of the fuel rods, so that it can accurately check abnormalities in the outer diameters of the fuel rods.

主权项

1. An apparatus for measuring outer diameters of fuel rods of a nuclear fuel assembly, the apparatus comprising:
a support unit disposed on a floor at a lower portion thereof; a measuring unit mounted on the support unit and configured to move up and down to measure the outer diameters of the fuel rods, the measuring unit including
a base mounted on the support unit and moving up and down,a length adjustor mounted on the base, anda pair of contact arms installed on the length adjuster and contacting with outer circumferential surfaces of the fuel rods being measured, the pair of contact arms having a predetermined length enough to contact with at least two fuel rods at the same time; and a transducer configured to convert the outer diameters measured by the measurement unit of the fuel rods into electrical signals, and configured to send the converted signals to the outside.