An In-Bay Equipment for the Visual and Dimensional Inspections of CANDU Fuel Bundles

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M.S. Cho
C.K. Jo
D.S. Gu
K.J. Park
J.S. Jun
Jong Yeob Jung
Ho Chun Suk

Abstract

KAERI developed the equipment for the precise inspections of visuals and dimensions of CANDU existing and advanced fuel bundles in spent fuel storage water-bay as well as in-air by using the remote control systems of a radiation resistance under-water TV camera and eleven LVDTs. The LVDT sensors are calibrated with a standard drum bundle which is equipped with one step motor for the rotation of the calibration disk and one linear actuator. The disk and actuator calibrate the LVDT sensors for the measurements of radial displacements and endplate waviness, respectively. The LVDT axial moving and rotational systems are calibrated with three standard drum bundles. All standard drum bundles used in this work were calibrated with a standard-equipment approved by Korean Standard Bureau. The 7th and 9th order linear polynomial functions are introduced in the calibrations of each LVDT sensor and each system of LVDT axial moving and rotational structures, respectively. The measurement accuracy of the in-bay inspection equipment in a water-pool bay was found to be 0.01 mm (10um) as a maximum measurement error. As a commissioning test, the in-bay inspection equipment was successfully operated for the visual and dimensional measurements of the 8 37-element bundles irradiated normally in the two phase flow region of a three high power channels and one low power channel of Wolsong PGS Unit 3.

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