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Feasibility of fluorescent X-ray computed tomography to verify the homogeneity of Mo/Gd contained in nuclear fuels: A Monte Carlo simulation

Authors
Jo, AjinLee, Wonho
Issue Date
11-9월-2018
Publisher
ELSEVIER SCIENCE BV
Keywords
Fluorescent X-ray computed tomography (FXCT); Nuclear fuels; U-Mo; (U, Gd)O-2
Citation
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, v.902, pp.25 - 32
Indexed
SCIE
SCOPUS
Journal Title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume
902
Start Page
25
End Page
32
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/73114
DOI
10.1016/j.nima.2018.05.064
ISSN
0168-9002
Abstract
We studied the feasibility of a fluorescent X-ray computed tomography (FXCT) system to monitor the uniformity of nuclear fuels; this system could be used for research reactors or power reactors. In general, nuclear fuels contain non-fissile metals for various purposes. To avoid the use of high-enriched uranium (HEU) fuels, U-Mo alloy fuels have been studied to lower the enrichment factor and to enhance the uranium density of fuels to be used in research reactors. (U, Gd)O-2 fuel is another uranium-metal alloy in which gadolinium (III) oxide (Gd2O3) powder is added to uranium dioxide (UO2) to adjust the reactivity of the fuel and enhance the performance of UO2. To guarantee the combustion stability of fuels in reactors, it is important to verify the homogeneity of alloy metals contained in the fuels. The FXCT system, which analyzes materials based on characteristic X-rays emitted from atoms, could be used to verify the homogeneity of the materials contained in nuclear fuels. External radiation sources are not necessary to induce characteristic X-rays from the fuel, as the gamma rays emitted from U-235 stimulate the fuel atoms. To verify the feasibility of the system, we measured the energy spectrum of a UO2 pellet, in which small metal pieces of Gd and Mo were attached to the surface. Based on simulation studies, 2D and 3D radiographic images of UO2 fuels with Gd and Mo were reconstructed to verify the effectiveness of the FXCT system.
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보건과학대학 (보건환경융합과학부)
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