Lattice contraction in the rim zone as controlled by recrystallization: Additional evidence

Spino, J.; Papaioannou, D.

doi:10.1016/j.jnucmat.2007.03.173

Cited by 12 publications

(12 citation statements)

References 10 publications

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“…These results also suggest that the stored-energy saturates when the grain subdivision phase starts. The increase of the stored energy between 55 and 65 GWd/MtU could be related to the attainment of the solubility limit we have already mentioned, or a The decrease of the non-uniform strain around 55 GWd/MtU is, up to now, not explained, but could probably be in relation with the increase of the lattice parameter reported by J.Spino [11] in the "sub-rim" region.…”

Section: A Transformation At Quasi-constant Volumementioning

confidence: 74%

“…Evidence showed (Spino [9], Rest [10], Spino [11]) that the gas precipitation and the propagation of the grain subdivision don't occur at the same burn-up. Gas starts to precipitate in tiny bubbles then; bubbles grow sometimes quite quickly to achieve a micrometric size.…”

Section: State Of the Artmentioning

confidence: 99%

“…However, this step in the HBS process can be heavily delayed in some cases, as observed in the N118 BR3 fuel rod (Spino [9]) and other similar rods (figure 2). Spino [11] et al have recently shown that lattice contraction accompanies grain subdivision propagation.…”

Section: State Of the Artmentioning

confidence: 99%

“…During fuel restructuring, J.Spino [11] shows that the lattice parameter is decreasing in the same time of 0.1 %. This means that the transformation could be considered as happening at nearly constant volume.…”

Section: A Transformation At Quasi-constant Volumementioning

confidence: 99%

“…It was shown that in case of a delayed HBS transformation like presented in the N118 BR3 fuel rod (J.Spino [9][10][11]), it was associated to a higher density of micrometric bubbles with a smaller size (presentation D.Baron [24] bubbles/m 3 usually measured. The formation of a higher density of small bubbles suggests a smaller mobility of atoms.…”

Section: Effect Of the Local Constraintmentioning

confidence: 99%

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Discussion About HBS Transformation in High Burn-Up Fuels

Baron¹,

Kinoshita²,

Thévenin³

et al. 2009

Nuclear Engineering and Technology

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Section: A Transformation At Quasi-constant Volumementioning

confidence: 74%

Section: State Of the Artmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

Section: A Transformation At Quasi-constant Volumementioning

confidence: 99%

Section: Effect Of the Local Constraintmentioning

confidence: 99%

See 3 more Smart Citations

Discussion About HBS Transformation in High Burn-Up Fuels

Baron¹,

Kinoshita²,

Thévenin³

et al. 2009

Nuclear Engineering and Technology

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A Model for Simulation of Coupled Microstructural and Compositional Evolution

Tikare¹,

Homer²,

Holm³

2012

Ceramic Engineering and Science Proceedings

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The formation, transport and segregation of components in nuclear fuels fundamentally control their behavior, performance, longevity and safety. Most nuclear fuels enter service with a uniform composition consisting of a single phase with two or three components. Fission products form, introducing more components. The segregation and transport of the components is complicated by the underlying microstructure consisting of grains, pores, bubbles and more, which is evolving under temperature gradients during service. As they evolve, components and microstructural features interact such that composition affects microstructure and vice versa. The ability to predict the interdependent compositional and microstructural evolution in 3D as a function of burn-up would greatly improve the ability to design safe, high burn-up nuclear fuels. We present a model that combines elements of Potts Monte Carlo, MC, and the phase-field model to treat coupled microstructural-compositional evolution. This hybrid model uses an equation of state, EOS, based on the microstructural state and the composition. The microstructural portion uses the traditional MC EOS and the compositional portion uses the phase-field EOS:∫ dV E v is the bulk free energy of each site i and J is the bond energy between neighboring sites i and j; thus, this term defines the microstructural interfacial energy. The last term is the compositional interfacial energy as defined in the traditional phase-field model. Evolution of coupled microstructure-composition is simulated by minimizing free energy in a path dependent manner. This model will be presented and will be demonstrated by applying it to evolution of nuclear fuels during service.

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