Article Materials Science, Multidisciplinary
Application of BISON to UO2 MiniFuel fission gas release analysis
Amani Cheniour, Giovanni Pastore, Jason M. Harp, Christian M. Petrie, Nathan A. Capps
Summary: There is a recent push to accelerate nuclear fuel qualification by combining advanced modeling and simulation with accelerated separate effects irradiation testing. An assessment and sensitivity study was conducted on calculated fission gas release from UO2 MiniFuel disks. Qualitatively, the existing fission gas behavior model in BISON reproduces the effects of temperature and burnup as expected, but shows a less satisfactory predictive capability when compared quantitatively with FGR data from irradiated UO2 disks under thermal annealing representative of LOCA conditions.
JOURNAL OF NUCLEAR MATERIALS (2022)
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Article Materials Science, Multidisciplinary
Impact of fission gas bubbles on thermal conductivity of UO2 fuels with high thermal conductivity additives
Floyd W. Hilty, Dong-Uk Kim, Michael R. Tonks
Summary: This study investigates the impact of fission gas bubbles on the effective thermal conductivity (ETC) of composite nuclear fuels. The results show that fission gas bubbles may completely eliminate the benefits of high thermal conductivity additives, leading to even lower thermal conductivity than fuel without additives. A trend relating the fraction of additive screened by bubbles to the ETC is identified, and a model is proposed to predict the ETC of composite fuels with fission gas bubbles for better estimation of fuel design benefits.
JOURNAL OF NUCLEAR MATERIALS (2021)
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Article Physics, Applied
Restructuring in high burn-up pressurized water reactor UO2 fuel central parts: Experimental 3D characterization by focused ion beam-scanning electron microscopy
Jean Noirot, Rebecca Dowek, Isabelle Zacharie-Aubrun, Thierry Blay, Martiane Cabie, Myriam Dumont
Summary: FIB-SEM 3D examination was conducted on high burn-up PWR fuel samples and revealed the distribution of intragranular and intergranular bubbles. The study found that, under high burn-up conditions, initial grains undergo restructuring to form smaller sub-grains with low angle boundaries, and bubble formation occurs predominantly on these boundaries. Additionally, the study observed the presence of small compact bubbles in the sub-grains, which thicken and form more complex structures as burn-up increases. However, no long distance networks were found between the sub-grains or original grains.
JOURNAL OF APPLIED PHYSICS (2022)
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Article Materials Science, Multidisciplinary
Ultrafast diffusion of overpressurized gas filled nanobubbles in UO2
Alexander Antropov, Vladimir Stegailov
Summary: In this study, molecular dynamics modeling revealed a new diffusion mechanism for xenon nanobubbles in UO2, which could potentially explain the contradictory data on bubble diffusion and fission gas release rate in UO2.
Article Nuclear Science & Technology
Three-dimensional phase-field simulation of intergranular bubble evolution in UO2 during irradiation
Xun Lan, Yanbo Jiang, Dan Sun, Wenbo Liu, Wenjie Li
Summary: In this study, a three-dimensional phase-field model was developed to investigate the evolution of intergranular bubbles during irradiation. The study examined the dependency of bubble percolation on bubble shape, fission rate, and average grain size. The simulation results revealed the significant effects of these factors on the shape of GB bubbles, the percolation rate, and the connectivity threshold of GB bubbles.
NUCLEAR ENGINEERING AND DESIGN (2024)
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Article Materials Science, Multidisciplinary
The predicted shapes of voids and Xe bubbles in UO2
C. O. T. Galvin, M. J. D. Rushton, M. W. D. Cooper, D. A. Andersson, P. A. Burr, R. W. Grimes
Summary: This study used molecular dynamics and Monte Carlo simulations to predict the lowest energy shapes for voids and bubbles in UO2. It was found that low energy faceted voids are slightly more energetically favourable than spherical voids, and as Xe is added and bubble pressure increases, the faceted morphology becomes even more favourable than the spherical shape.
JOURNAL OF NUCLEAR MATERIALS (2021)
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Article Materials Science, Multidisciplinary
Diffusion of Xe and Kr implanted at low concentrations in UO2 as a function of temperature-An experimental study
M. Gerardin, E. Gilabert, D. Horlait, M-f. Barthed, G. Carlot
Summary: The production and release of fission gases have a significant impact on uranium dioxide fuel performance. A better understanding of fission gas behavior in uranium dioxide is needed to predict fuel properties in a nuclear reactor. Experiments with low-dose implantation of xenon or krypton in UO2 samples were conducted to avoid trapping by irradiation defects and/or gas clusters. The release rates of xenon and krypton were studied, and the results showed excellent agreement with previous literature on xenon diffusion in irradiated UO2.
JOURNAL OF NUCLEAR MATERIALS (2023)
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Article Materials Science, Multidisciplinary
Bayesian calibration with summary statistics for the prediction of xenon diffusion in UO2 nuclear fuel
Pieterjan Robbe, David Andersson, Luc Bonnet, Tiernan A. Casey, Michael W. D. Cooper, Christopher Matthews, Khachik Sargsyan, Habib N. Najm
Summary: This study presents a Bayesian framework to calibrate a novel model for fission gas transport in UO2 nuclear fuel. Synthetic data sets are used to estimate model parameters that can accurately predict the diffusion rates of uranium and xenon. The study demonstrates a good match between the calibrated diffusivity predictions and the reported data summaries.
COMPUTATIONAL MATERIALS SCIENCE (2023)
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Article Chemistry, Multidisciplinary
Extended Development of a Fission Gas Release Behavior Model Inside Spherical Fuel Grains for LWR Reactors
Jingyu Guo, Songbai Cheng, Kai Wang, Wenzhong Zhou
Summary: Fission gas behavior is crucial for accident assessment and evaluating fuel rod performance. This study presents an extended model for predicting fission gas release in light water reactors. The model is validated using input parameters from other models and experiments. The results show that diffusion coefficients, temperatures, grain sizes, and linear heat generation rates all have an influence on the fission gas release fraction.
APPLIED SCIENCES-BASEL (2023)
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Article Materials Science, Ceramics
Compositional design of an amphoteric chemical trap for the capturing of gaseous cesium and iodine in UO2 nuclear fuel
Sang-Chae Jeon, Dong-Joo Kim, Dong Seok Kim, Jae-Hwan Yang, Kyoung-Seok Moon
Summary: A chemical trap in the form of Ba-Al-Si-O has been developed to capture gaseous cesium and iodine in UO2 nuclear fuel. By using thermodynamic estimations, a composition of 1BaO-1Al(2)O(3)-1SiO(2) is suggested for efficient trapping under reducing conditions at 650 degrees C. This study provides a methodology for compositional design and empirical confirmation to reduce the release of fission gases in accident-tolerant fuel development.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY (2021)
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Article Engineering, Chemical
Grain-scale study of the grain boundary effect on UO2 fuel oxidation and fission gas release under reactor conditions
Min Liu, Qinjun Kang, Hongwu Xu
Summary: This study investigates the oxidation of UO2 and its impact on fuel behaviors under reactor conditions using a grain-scale reactive transport model. The research reveals the influence of grain boundary density and diffusivity on oxidation process, providing insights into the effects of fuel microstructure on fuel behaviors.
CHEMICAL ENGINEERING SCIENCE (2021)
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Article Materials Science, Multidisciplinary
Single-size and cluster dynamics modeling of intra-granular fission gas bubbles in UO2
G. Pastore, N. Militello, S. Blondel, B. D. Wirth
Summary: We simulated the evolution of intra-granular fission gas bubbles in UO2 using two models and compared the results to experimental data. The models showed excellent agreement with each other and with the experimental trends of bubble average size and number density. The calculated results either matched the data well or had errors within consistent uncertainties.
JOURNAL OF NUCLEAR MATERIALS (2023)
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Article Materials Science, Multidisciplinary
Experimental investigation of Kr diffusion in UO2+x : Slight deviations from stoichiometry, significant effects on diffusion kinetics and mechanisms
D. Horlait, J. Domange, M-L Amany, M. Gerardin, M-F Barthe, G. Carlot, E. Gilabert
Summary: Thermo-Desorption Spectrometry (TDS) was used to study the release of fission gases from UO2+x samples with various hyperstoichiometry levels. An analytical model based on Fick's second law was developed to determine the diffusion kinetics of krypton in the material. The study showed that even slight deviations from stoichiometric UO2 can significantly affect the diffusion of fission gases.
JOURNAL OF NUCLEAR MATERIALS (2023)
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Article Materials Science, Multidisciplinary
Phase-field simulations of fission gas bubbles in high burnup UO2 during steady-state and LOCA transient conditions
Larry K. Aagesen, Sudipta Biswas, Wen Jiang, David Andersson, Michael W. D. Cooper, Christopher Matthews
Summary: A phase-field model was developed to simulate the fission gas bubble microstructure in nuclear fuel, focusing on bubble growth in the HBS region. Simulations showed that during steady-state conditions, overpressurized bubbles decreased in pressure as they grew, but still remained above equilibrium pressure. During a LOCA transient, bubble size did not change significantly.
JOURNAL OF NUCLEAR MATERIALS (2021)
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Article Engineering, Biomedical
A versatile gas-generator promoting drug release and oxygen replenishment for amplifying photodynamic-chemotherapy synergetic anti-tumor effects
Xiudan Wang, Yuling Mao, Changshan Sun, Qinfu Zhao, Yikun Gao, Siling Wang
Summary: This study introduces a gas-generator using hollow mesoporous silica nanoparticles, combined with perfluoropentane droplets, indocyanine green, and doxorubicin to promote drug release and oxygen replenishment. Under laser irradiation, the release of drugs and oxygen was successfully achieved, amplifying the synergistic effects of photodynamic therapy and chemotherapy.
BIOMATERIALS (2021)
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