The Precise X-Ray Inspection for DUPIC Fuel Elements Weldded by Nd:YAG Laser

Abstract

DUPIC (Direct use of spent PWR fuel in CANDU reactors) nuclear fuel is a CANDU fuel fabricated remotely from spent PWR fuel materials at hot cell. The soundness of the end closure welds of nuclear fuel element is an important factor for the safety and performance of nuclear fuel. To evaluate the soundness of the end closure welds of DUPIC fuel element, a precise X-ray inspection system was developed using a micro-focus X-ray inspection system with an image intensifier and a real time camera system. The fuel elements made of Zircaloy-4 and stainless steel by an Nd:YAG laser welding and a TIG welding were inspected by the developed inspection system. The soundness of the welds of the fuel elements was confirmed by the inspection system, and the irradiation test of the fuel elements has been successfully completed at the HANARO research reactor.