Restructuring in high burnup UO2 studied using modern electron microscopy

Gerczak, Tyler J.; Parish, Chad M.; Edmondson, Philip D.; Baldwin, Charles A.; Terrani, Kurt A.

doi:10.1016/j.jnucmat.2018.05.077

Cited by 70 publications

(72 citation statements)

References 44 publications

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“…The presence of local "in transition" areas is especially evident in the analysis at r/r o ∼ 0.94, while also noticeable in the mid-radial region to some degree (see Fig. 2.2) [22].…”

Section: Thermal Conductivity Modelsmentioning

confidence: 72%

“…To ensure that the model is implemented in BISON correctly and outputs reasonable values, we create thermal conductivity plots. [22] pointed out that the HBS is predominantly defined by HIGB, and the presence of LAGB indicates an incomplete transition to the HBS.…”

Section: Thermal Conductivity Modelsmentioning

confidence: 99%

“…This quantity is calculated locally at each BISON engineering mesh point, 1 Polygonization is the subdivision of grains due to the arrangement of dislocations at the new restructured boundaries. Polygonization is thought to be responsible for the restructuring associated with HBS formation (e.g., [22]), although the re-crystallization mechanism has also been proposed. which represents a region of fuel large enough to contain a statistically significant number of microstructural features.…”

Section: Model Descriptionmentioning

confidence: 99%

“…3 Volume fraction of HBS as a function of the effective burnup according to the model implemented in BISON and based on [23]. Experimental data derived from [22,25] in [23]…”

mentioning

confidence: 99%

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BISON Capabilities for LWR Fuel Behavior Analysis During Accident and High-burnup Conditions

Toptan

Pastore

Gamble

2020

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The U.S. Department of Energy (DOE)'s Nuclear Energy Advanced Modeling and Simulation (NEAMS) program aims to develop predictive capabilities using computational methods for the analysis and design of advanced reactor and fuel cycle systems. This program has been supporting the development of BISON, a high-fidelity and high-resolution fuel performance tool at the engineering scale. Recent increasing interest in applications at extended burnups motivated this study to incorporate more physically based models in BISON. This document details integration of newly implemented modeling capabilities for BISON. These include: (1) new thermal conductivity models that are valid up to 100 GWd/t, (2) models for the formation of the high-burnup structure (HBS), (3) two porosity correction methods applied to the thermal conductivity due to the conducting pores during the HBS formation. BISON's results are verified and validated to test the new modeling capabilities.

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“…The presence of local "in transition" areas is especially evident in the analysis at r/r o ∼ 0.94, while also noticeable in the mid-radial region to some degree (see Fig. 2.2) [22].…”

Section: Thermal Conductivity Modelsmentioning

confidence: 72%

Section: Thermal Conductivity Modelsmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

“…3 Volume fraction of HBS as a function of the effective burnup according to the model implemented in BISON and based on [23]. Experimental data derived from [22,25] in [23]…”

mentioning

confidence: 99%

See 2 more Smart Citations

BISON Capabilities for LWR Fuel Behavior Analysis During Accident and High-burnup Conditions

Toptan

Pastore

Gamble

2020

View full text Add to dashboard Cite

show abstract

“…152 The mechanisms responsible for these changes are not clearly understood yet, but they seem to correlate with the polygonization processes. TEM and SEM observations performed 99,153 suggest the initial grains are subdivided rather than recrystallized in the HBS. It is not yet clear whether the HBS has a beneficial effect on the radiation resistance of the nuclear fuel.…”

Section: Radiation-induced Mechanical and Microstructural Effects In mentioning

confidence: 94%