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An investigation of the failure modes in U-10Mo monolithic fuel irradiated to high burnup

Journal Article · · Journal of Nuclear Materials

Here, this study investigated possible failure mode sequences in U-10Mo monolithic fuel irradiated to very-high-burnup. The U-Mo fuel plate used in this study was characterized using scanning electron microscopy (SEM), wavelength dispersive spectroscopy (WDS), and image analysis techniques to investigate how microstructural features may initiate crack formation and propagation through the microstructure, potentially leading to blistering. Distinctly large fission gas pores (FGPs) were observed to preferentially align 5-15µm away from the U-10Mo/Zr interface, parallel to the Zr diffusion barrier. Preferential growth, alignment, and interconnection of FGP could initiate blistering in the fuel plate by creating a fission gas channel, parallel to the U-Mo/Zr interface. FGP alignment in the fuel phase near the U-Mo/Zr interface is believed to be one of the precursors to crack and Type 2 blister formation in monolithic U-Mo fuels. The chemical maps revealed differences in fission product behavior near the U-Mo/Zr interface such that Nd remains in the fuel matrix at the FGP sites. On the other hand, other fission products like Xe and Cs can get trapped in FGPs by Nd in the fuel phase and/or diffuse toward the Zr diffusion barrier.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1957642
Report Number(s):
INL/JOU-22-66978
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: - Vol. 575; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (19)

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Effects of irradiation on the interface between U-Mo and zirconium diffusion barrier journal February 2018
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High burnup structure formation in U-Mo fuels journal May 2022
Comparison of manual and automated image analysis techniques for characterization of fission gas pores in irradiated U-Mo fuels journal April 2019
Shutdown-induced tensile stress in monolithic miniplates as a possible cause of plate pillowing at very high burnup journal March 2018
Development and Irradiation Performance of Uranium Aluminide Fuels in Test Reactors journal June 1980
IRRADIATION PERFORMANCE OF U-Mo MONOLITHIC FUEL journal April 2014

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