Impact of SEM acquisition parameters on the porosity analysis of irradiated U-Mo fuel

Salvato, Daniele; Smith, Charlyne; Ye, B.; Mei, Zhi-Gang; Yacout, Abdellatif M.; Eyken, J. Van; Miller, Brandon; Keiser, Dennis D.; Glagolenko, Irina; Giglio, Jeffrey J.; Robinson, Adam; Leenaers, A.; Wight, Jared; Jody, Henley,

doi:10.1016/j.nme.2023.101469

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…It may be concluded that magnetite agglomerations occur more often in lower layers, making them only visible with high-voltage SEM, which is well-known to enable much deeper probing depths [32]. This corresponds with the results of the TGA measurements, which showed precipitation of the magnetite nanoparticles during the electrospinning process, resulting in lower amounts of magnetite in the upper layers of the nanofiber mat.…”

Section: Resultssupporting

confidence: 81%

“…This shows that in the sample spun from the solution with 25 wt.% solid content, the magnetite nanoparticles are also visible in the upper layers that are produced at the end of the electrospinning process. The correlation of the significantly increased Fe content and visible agglomerations in the fibers or between them is also It may be concluded that magnetite agglomerations occur more often in lower layers, making them only visible with high-voltage SEM, which is well-known to enable much deeper probing depths [32]. This corresponds with the results of the TGA measurements, which showed precipitation of the magnetite nanoparticles during the electrospinning process, resulting in lower amounts of magnetite in the upper layers of the nanofiber mat.…”

Section: Resultsmentioning

confidence: 99%

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Electrospinning Poly(acrylonitrile) Containing Magnetite Nanoparticles: Influence of Magnetite Contents

Graciano Alvarez,

Dotter,

Tuvshinbayar

et al. 2024

Fibers

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Magnetic nanofibers were prepared by electrospinning polymer/metal solutions of poly(acrylonitrile) (PAN) with magnetite (Fe3O4) nanoparticles. At a mass ratio of PAN:magnetite of 2:1, the total solid content in the dimethyl sulfoxide (DMSO) solution was varied between 15 wt.% and 25 wt.%, which represents the limits of the spinnable range. The results show that the most homogeneous nanofiber mats were 21 wt.% solid contents. At 15 wt.% solid contents, a nano-membrane with some fibrous regions was produced. Nanofibers at 25 wt.% had a much larger and more inhomogeneous diameter. Nevertheless, the magnetic properties of all samples were very similar, indicating that the distribution of magnetite nanoparticles in the fibers is comparable in all samples. The results also suggested that the samples spun from solutions with near-ideal solid contents (19–21 wt.%) contain agglomerations of the nanoparticles inside the nanofibers.

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Electrospinning Poly(acrylonitrile) Containing Magnetite Nanoparticles: Influence of Magnetite Contents

Graciano Alvarez,

Dotter,

Tuvshinbayar

et al. 2024

Fibers

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“…It was reported that the porosity analysis is sensitive to the SEM voltage. In the range from 5 KV to 30 KV, a relative difference about ~30% in the total porosity was recorded at a sample cut from a full-size dispersion plate irradiated at the Belgian Reactor 2 (BR2) [33]. The porosity experimental data of fuel plate L1P7A0 used in this study were measured at a voltage of 14 KV.…”

Section: Predictions Of the Macroscale Porosity And The Thickness Def...mentioning

confidence: 99%

Prediction and Deformation Mechanism Analysis of High Porosity in U–10Mo Monolithic Fuels at High Burnup

Jian,

Zhao,

Ding

2023

Metals

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High porosity phenomena of U-10Mo fuel foil appear in the U–Mo/Al monolithic fuel plate under deep burnup. In this study, the fuel skeleton creep-based bubble growth model is further improved with the intrusion effect of solid fission products, multiplying the reduction factor in the bubble volume to obtain the bubble pressure. With the locally enhanced irradiation creep of the Mo-depleted region considered, a simulation of the thermo-mechanical coupling behaviors of the monolithic fuel plate L1P7A0 is carried out, based on the commercial finite element (FE) analysis code ABAQUS. A fission-induced creep rate coefficient of 250 × 10−22 mm3/(fission·MPa) is identified for the Mo-depleted region, with the predictions of porosity and the thickness deformation of U–Mo fuel foil agreeing well with the experimental data. The research results indicate that: (1) the locally enhanced fuel skeleton creep ability is responsible for the higher porosities near the U–Mo/Zr interface; (2) the entrance of solid fission products into the fission bubbles at high burnup is the dominant factor in inducing high porosity in the regions of the most heavily irradiated fuel foil, especially near the fuel foil edge bearing the elevated external hydrostatic pressures; (3) with the intrusion effect of solid fission products considered, the prediction of the porosity increases from ~15% to ~35% near the fuel foil edge; (4) the intrusion of solid fission products leads to extra differences between the bubble pressure and the external pressure, and simultaneously results in the strengthened fuel skeleton creep deformation contributions to the bubble growth.

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Contributions to the mechanistic understanding of the microstructural evolution in irradiated U-Mo dispersion fuel

Salvato,

Smith,

Pavlov

et al. 2024

Journal of Nuclear Materials

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Impact of SEM acquisition parameters on the porosity analysis of irradiated U-Mo fuel

Cited by 4 publications

References 37 publications

Electrospinning Poly(acrylonitrile) Containing Magnetite Nanoparticles: Influence of Magnetite Contents

Electrospinning Poly(acrylonitrile) Containing Magnetite Nanoparticles: Influence of Magnetite Contents

Prediction and Deformation Mechanism Analysis of High Porosity in U–10Mo Monolithic Fuels at High Burnup

Contributions to the mechanistic understanding of the microstructural evolution in irradiated U-Mo dispersion fuel

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