Pore pressure estimation in irradiated UMo

Salvato, Daniele; Leenaers, A.; Berghe, S. Van den; Detavernier, Christophe

doi:10.1016/j.jnucmat.2018.08.039

Cited by 28 publications

(9 citation statements)

References 49 publications

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“…It should also be mentioned that the Xe GBSL in U-7Mo has the highest degree of ordering among all VSLs and GBSLs observed so far. The Xe GBSL was found to form near grain boundaries first and then progressed into grain interiors upon increasing burnups (Salvato et al, 2020). Further analysis of Xe GBSL formed at low burnups suggested that the GBSL may have formed as VSL before a substantial amount of Xe was produced, giving a plausible explanation of its nearly perfect ordering compared to other GBSLs.…”

Section: Gas Bubble Superlattice-gbslmentioning

confidence: 93%

“…First and most importantly, fcc Xe GBSLs have been observed in bcc U-7Mo fuels irradiated by fission neutron (see Figure 3A) by three different groups (Van den Berghe et al, 2008;Gan et al, 2010;Gan et al, 2014;Salvato et al, 2020), indicating that GBSLs are not necessarily isomorphic with the host materials. Although bct VSL and GBSL have been reported in bcc Cr (Sun et al, 2022) and Mo (Sun et al, 2018) (see Figure 3B), respectively, they were believed to be altered only slightly by lattice strain and would otherwise be isomorphic with the bcc host materials.…”

Section: Gas Bubble Superlattice-gbslmentioning

confidence: 99%

“…Surprisingly, the Xe GBSLs in U-7Mo, which is the only GBSL observed so far under fission neutron irradiation, display the best ordering among all superlattices observed experimentally. The Xe GBSLs have been found to form at low fuel burnups before a significant amount of fission gas has been produced, suggesting that they may have formed as VSLs and become pressurized later (Salvato et al, 2020). 6) Both GBSL and VSL seem to form via a three stage process from randomly arranged voids/bubbles to planar ordering and then 3D lattice (Evans, 2006;Sun et al, 2019).…”

Section: Summary Of Experimental Findings On Both Vsl and Gbslmentioning

confidence: 99%

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A review of void and gas bubble superlattices self-organization under irradiation

Zhang

2023

Front. Nucl. Eng.

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Irradiation by high-energy particles has been well known as a destructive force that “damages” crystalline materials by creating lattice defects. One surprising outcome from irradiation is the self-organization of void superlattices and gas bubble superlattices in various materials under irradiation. While these superlattices exhibit crystal structures that mimic atomic lattices, their self-organization takes place in far-from-equilibrium environment. A thermodynamic driving force that entails ordering is either absent or yet to be identified. In the past few decades, extensive research efforts have been made to generate such superlattices and to discern their formation mechanisms. While a consensus is yet to reach, these studies have substantially enriched our understanding on defect evolution and self-organization under irradiation. Appending previous reviews that are mostly done two decades ago, this article presents a comprehensive review of new experimental, theoretical, and simulational studies of void and gas bubble superlattices in the past two decades. An in-depth discussion on the formation mechanisms and their implications on superlattice properties is provided for the purpose of encouraging future studies.

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Section: Gas Bubble Superlattice-gbslmentioning

confidence: 93%

Section: Gas Bubble Superlattice-gbslmentioning

confidence: 99%

Section: Summary Of Experimental Findings On Both Vsl and Gbslmentioning

confidence: 99%

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A review of void and gas bubble superlattices self-organization under irradiation

Zhang

2023

Front. Nucl. Eng.

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“…Large gas bubbles or pores are observed in the fuel meat near the interface between fuel meat and the Zr barrier (Jue et al, 2018). The porosity may reach 20% (Salvato et al, 2018). The porosity and bubble pressure will affect the thermal-mechanical properties (Liu and Chen, 2015;Liu et al, 2016), and affect the stresses of the UMo skeleton structure by reducing the effective load-bearing cross-section.…”

Section: Introductionmentioning

confidence: 99%

Macro-Mesoscale In-Pile Thermal-Mechanical Behavior Simulation of a UMo/Zr Monolithic Fuel Plate

et al. 2022

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UMo/Zr monolithic fuel plates have a promising application prospect in high flux research reactors. To prolong the service life and achieve safety design, the in-pile macro-mesoscale thermal-mechanical behavior of the fuel plate needs further simulation research. In this study, for the fuel meat, the theoretical models of the equivalent fission gas bubble volume fraction, the gas-bubble inner pressure and the maximum skeleton stress are developed, with the effects of bubble distribution pattern involved. The application into the simulation of the in-pile macro-mesoscale thermal-mechanical behavior of the UMo/Zr monolithic fuel plate indicates that the maximum skeleton stress of the fuel meat basically rises with the burn-up, and may reach four times of the macroscale first principal stress of the fuel meat. The distribution patterns of the gas bubbles in the fuel meat might have a distinct influence on the maximum skeleton stress, and the most conservative results of the simple cubic arrangement can be used for the failure prediction of the fuel meat.

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“…Complicated in-pile thermo-mechanical behavior appears in U-Mo/Al monolithic fuel assemblies (Miller et al, 2010;Kim et al, 2012;Deng et al, 2017), which mainly depends on the following contributions: 1) the deformations (Miller et al, 2010;Kim and Hofman, 2011;Kim et al, 2013;Meyer et al, 2014;Zhao et al, 2015) induced by irradiation swelling and creep of fuel foil (Kim et al, 2013;Kim and Hofman, 2011); 2) the plasticity and thermal creep performances of cladding (Yan et al, 2017;Jian et al, 2019a); 3) formation of porous fuel structure due to the fission-gas-resulted bubbles (Rest, 2010;Meyer et al, 2014); 4) the acceleration of fission gas swelling driven by grain recrystallization (Rest, 2010); 5) the degradations of thermo-mechanical properties and macroscale strength owing to the formed porous structure, pore pressure and the possible creep damage in the fuel foil (Rest, 2010;Robinson et al, 2008;Iltis et al, 2016;Yan et al, 2017;Salvato et al, 2018;Jian et al, 2019a;Schulthess et al, 2019); 6) the complex mechanical interactions across all the parts, including the fuel plates, the outside Al plates and the side plates (Deng et al, 2017). On one hand, the irradiation creep strains will relax the stresses in the fuel foils or the other parts.…”

Section: Introductionmentioning

confidence: 99%

Effects of U-Mo Irradiation Creep Performance on the Thermo-Mechanical Coupling Behavior in U-Mo/Al Monolithic Fuel Assemblies

et al. 2021

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To obtain the optimized fuel performance, the effects of U-Mo irradiation creep rate coefficient on the thermo-mechanical behavior of a fuel assembly are investigated. In this study, three cases of creep rate coefficient are considered. The distribution and evolution results of temperature, displacement, stress/strain and fuel foil micro-structure are analyzed. The simulation results indicate that with the increase of creep rate coefficient 1) the temperature field in the fuel assembly changes slightly; 2) the maximum out-of-plane displacements in the side plates decrease slightly; the maximum out-of-plane displacements in the fuel plates adjacent to the outside Al plates rise distinctly, induced by the enhanced bending deformation contributions; 3) the peak values of the first principal stresses and skeleton normal stresses in the fuel foils are reduced, while the through-thickness creep strains are enlarged; 4) with an increase of fuel creep rate coefficient from 500 × 10−22 mm3/(fission MPa) to 2,000 × 10−22 mm3/(fission·MPa), the maximum Von Mises stress in the fuel cladding decreases by ∼24% on the 308th day. This work is helpful for advanced fabrication and optimization design of U-Mo/Al fuel assemblies.

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Pore pressure estimation in irradiated UMo

Cited by 28 publications

References 49 publications

A review of void and gas bubble superlattices self-organization under irradiation

A review of void and gas bubble superlattices self-organization under irradiation

Macro-Mesoscale In-Pile Thermal-Mechanical Behavior Simulation of a UMo/Zr Monolithic Fuel Plate

Effects of U-Mo Irradiation Creep Performance on the Thermo-Mechanical Coupling Behavior in U-Mo/Al Monolithic Fuel Assemblies

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