Helium behaviour in stoichiometric and hyper-stoichiometric UO2

Talip, Zeynep; Wiss, T.; Maugeri, E. A.; Colle, Jean‐Yves; Raison, Philippe E.; Gilabert, E.; Ernstberger, M.; Staicu, D.; Konings, R.J.M.

doi:10.1016/j.jeurceramsoc.2013.11.032

Cited by 18 publications

(18 citation statements)

References 67 publications

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“…However, the available helium solubility data in UO 2 show a wide scattering [3][4][5][6][7][8]. In our previous study, we have observed that the dissolved helium quantity is lower in the presence of interstitial oxygen in hyper-stoichiometric UO 2 compared to stoichiometric UO 2 [15]. However, a markedly increase of the dissolved helium quantity was observed in the U 3 O 8 samples which has a different crystal structure than UO 2 .…”

Section: Helium Thermal Desorptionmentioning

confidence: 99%

“…Comparison of the helium release as a function of temperature from the stoichiometric and hyper-stoichiometric UO 2 samples suggests that thermal helium diffusion (under vacuum) increases with increasing oxygen content of the samples. In the present study, we avoid direct comparison of the dissolved He quantities in La-doped UO 2 samples and stoichiometric UO 2 and hyper-stoichiometric UO 2 samples [15]. Hyperstoichiometric UO 2 samples were prepared by treating of stoichiometric commercial UO 2 specimens in a suitable oxygen potential and temperature.…”

Section: Helium Thermal Desorptionmentioning

confidence: 99%

“…In a previous work, we have studied helium dissolution and diffusion in UO 2 , UO 2+ x , and U 3 O 8 samples [15]. To have a comprehensive picture on the helium behavior in non-stoichiometric UO 2 systems, this work is aimed at studying the helium behavior in hypo-stoichiometric UO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this study is to understand the helium behavior in hypostoichiometric UO 2 , and the use of lanthanum, a fission product and a Nuclear Materials and Energy 3-4 (2015) [12][13][14][15][16] proxy for trivalent americium, will also help to understand the effect of cation substitution on helium dissolution on nuclear fuel. Three different UO 2 samples, containing 6, 11, and 22 mol% lanthanum, respectively, were examined.…”

Section: Introductionmentioning

confidence: 99%

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The dissolution of helium in La-doped UO2 as a surrogate of hypo-stoichiometric UO2

Talip

Wiss

Janssen

et al. 2015

Nuclear Materials and Energy

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In this work, the dissolution of helium in La-doped UO 2 samples was studied by helium infusion in an autoclave followed by thermal desorption (laser heating) coupled to mass spectrometer systems for the determination of helium release rate and the total helium quantity. Lanthanum was chosen as a dopant in UO 2 to study the effect of hypo-stoichiometry on helium solubility together with the impurity effect. Comparison of the dissolved He quantity from the samples with different La content showed that the dissolved He quantity slightly increases with increasing oxygen vacancy concentration in the samples.

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Section: Helium Thermal Desorptionmentioning

confidence: 99%

Section: Helium Thermal Desorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The dissolution of helium in La-doped UO2 as a surrogate of hypo-stoichiometric UO2

Talip

Wiss

Janssen

et al. 2015

Nuclear Materials and Energy

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“…The diffusion of helium in UO 2 and MOX fuels has been measured [6][7][8][9][10] or calculated [11][12][13][14] by several researchers. However, bubble swelling by helium has not been studied sufficiently.…”

Section: Introductionmentioning

confidence: 99%

Dependence of vacancy concentration on morphology of helium bubbles in oxide ceramics

Matsunaga¹,

Sakamoto²,

Muta

et al. 2014

Journal of Nuclear Science and Technology

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Since the formation of helium bubbles degrades swelling property and thermal conductivity of minor actinide-containing mixed oxide (MA-MOX) fuel, it is essential to understand the conditions of the bubble formation. In order to examine the dependence of vacancy concentration on morphology of helium bubbles, helium was infused into (Zr,Fe)O 2−x . The oxygen vacancy concentration was controlled by addition of solute Fe 3 + into ZrO 2 . Helium was infused by hot isostatic pressing. The helium-infused specimens were observed by field emission scanning electron microscopy (FE-SEM) and field emission transmission electron microscopy (FE-TEM). In addition, X-ray fluorescence, X-ray diffraction analysis, conversion electron yield-X-ray absorption near-edge structure and FE-SEM/EDX (energy dispersive X-ray) analyses were also made to interpret the results of microstructure observations. As a result of the helium infusion treatment, numerous 0.5-10 nm bubbles were observed and its number density clearly depended on oxygen vacancy concentration. On the other hand, sizes of the helium nano-bubbles in all specimens were almost constant.

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Behaviour and Properties of Nuclear Fuels

Konings

Bertolus

2018

Experimental and Theoretical Approaches to Actinide Chemistry

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Helium behaviour in stoichiometric and hyper-stoichiometric UO2

Cited by 18 publications

References 67 publications

The dissolution of helium in La-doped UO2 as a surrogate of hypo-stoichiometric UO2

The dissolution of helium in La-doped UO2 as a surrogate of hypo-stoichiometric UO2

Dependence of vacancy concentration on morphology of helium bubbles in oxide ceramics

Behaviour and Properties of Nuclear Fuels

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