133Xe release during post-irradiation annealing of uranium metal in the presence of a constant volume of air

Münze, R.; Hladik, O.; Marei, S. A.; El-Bayoumy, S.; Elgarhy, Mohammed

doi:10.1007/bf02517118

Cited by 6 publications

(6 citation statements)

References 2 publications

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“…First, the bulk modulus B of gas bubbles was assumed to be the same as that of the matrix phase. The pressure inside the gas bubble due to ) With the stress-free strain * ij  , the stress and strain fields can be obtained by solving the mechanical equilibrium equation 0 Mobility of Xe, vacancy and interstitialsThe effective diffusivity and activation energy of Xe in U alloys was studied by measuring Xe release during post-irradiation annealing[66]. The diffusivity of Xe was deduced to be ) diffusivity in irradiated U alloys also was described in a function of the fission rate as…”

mentioning

confidence: 99%

Formation mechanism of gas bubble superlattice in UMo metal fuels: Phase-field modeling investigation

Hu¹,

Burkes²,

Lavender³

et al. 2016

Journal of Nuclear Materials

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Nano-gas bubble superlattices are often observed in irradiated UMo nuclear fuels. However, the formation mechanism of gas bubble superlattices is not well understood. A number of physical processes may affect the gas bubble nucleation and growth; hence, the morphology of gas bubble microstructures including size and spatial distributions. In this work, a phase-field model integrating a first-passage Monte Carlo method to investigate the formation mechanism of gas bubble superlattices was developed. Six physical processes are taken into account in the model: 1) heterogeneous generation of gas atoms, vacancies, and interstitials informed from atomistic simulations; 2) one-dimensional (1-D) migration of interstitials; 3) irradiation-induced dissolution of gas atoms; 4) recombination between vacancies and interstitials; 5) elastic interaction; and 6) heterogeneous nucleation of gas bubbles. We found that the elastic interaction doesn't cause the gas bubble alignment, and fast 1-D migration of interstitials along <110> directions in the body-centered cubic U matrix causes the gas bubble alignment along <110> directions. It implies that 1-D interstitial migration along [110] direction should be the primary mechanism of an fcc gas bubble superlattice which is observed in bcc UMo alloys. Simulations also show that fission rates, saturated gas concentration, and elastic interaction all affect the morphology of gas bubble microstructures.

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confidence: 99%

Formation mechanism of gas bubble superlattice in UMo metal fuels: Phase-field modeling investigation

Hu¹,

Burkes²,

Lavender³

et al. 2016

Journal of Nuclear Materials

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“…The diffusivities of helium and hydrogen are comparable, as is often the case for metals such as bcc-W and bcc-Fe. − The proximity to the experimental hydrogen diffusivity data partially supports the validity of the present calculation of helium diffusivity. In contrast to hydrogen, the experimentally determined diffusion coefficients of xenon in the temperature range from 673 to 940 K by Münze et al are much lower than the calculated diffusion coefficients of helium, as shown in Figure , indicating that the size of the impurity has a large effect on the diffusivity of the impurity. The atomic radii determined by Clementi et al , following the work of Slater are 0.53 Å for hydrogen, 0.31 Å for helium, and 1.08 Å for xenon.…”

Section: Results and Discussionmentioning

confidence: 68%

First-Principles Calculations of the Diffusivity of Interstitial Helium in Alpha-U Considering Anisotropy, Isotope Effects, and Quantum Effects

et al. 2021

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The interstitial migration of helium in alpha-U, which is planned to be used as a tritium storage material for nuclear fusion reactors and as a metallic fuel for advanced nuclear reactors, is studied by first-principles calculations. First, all migration paths are identified using the nudged elastic band method, and the migration barrier is determined for each path considering the thermal expansion of the lattice. In addition, the jump attempt frequencies are determined by applying harmonic transition state theory coupled with vibration analysis. Subsequently, the diffusion coefficient is evaluated numerically by kinetic Monte Carlo calculations using the determined migration barriers and jump attempt frequencies for all migration paths. Diffusion in the [010]-direction is found to be the most unlikely until sufficiently high temperature, while [001]-diffusion is the most dominant diffusion direction through the whole temperature range. The isotope effect, which is important because the beta decay of tritium produces helium-3, is not large and approaches the classical limit as the temperature increases. The quantum tunneling crossover temperature is computed to be approximately 100 K for helium-3 and 86 K for helium-4, which ensures the validity of the present calculation results over a wide temperature range. The diffusion coefficients are obtained as for helium-3 and for helium-4 over a temperature range from 200 to 900 K.

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“…The diffusion of Xe in U has been measured in fission gas release experiments [39,40]. The experiments of Savage covered the temperature range from 773 K to 1273 K. Savage also probed a range of purities and processing conditions.…”

Section: Assumptionsmentioning

confidence: 99%

The effect of lattice and grain boundary diffusion on the redistribution of Xe in metallic nuclear fuels: Implications for the use of ion implantation to study fission-gas-bubble nucleation mechanisms

King

Tumey

Rest

et al. 2011

Journal of Nuclear Materials

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133Xe release during post-irradiation annealing of uranium metal in the presence of a constant volume of air

Cited by 6 publications

References 2 publications

Formation mechanism of gas bubble superlattice in UMo metal fuels: Phase-field modeling investigation

Formation mechanism of gas bubble superlattice in UMo metal fuels: Phase-field modeling investigation

First-Principles Calculations of the Diffusivity of Interstitial Helium in Alpha-U Considering Anisotropy, Isotope Effects, and Quantum Effects

The effect of lattice and grain boundary diffusion on the redistribution of Xe in metallic nuclear fuels: Implications for the use of ion implantation to study fission-gas-bubble nucleation mechanisms

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