Results 211 to 220 of about 2,225,685 (244)

Reversibility of fission gas swelling in uranium

Journal of Nuclear Materials, 1969
Abstract The effect of hydrostatic pressures up to 1000 bar on the behavior of pre-formed bubbles in irradiated uranium has been studied. High pressure, 900 °C anneals cause the fission gas swelling, induced in uranium by 600 °C vacuum anneals, to be reversed. Subsequent high temperature (900–1080 °C) vacuum tests produce the same swelling as samples
G.L. Kulcinski, R.D. Leggett
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The theory of degassing and swelling of a supersaturated-by-gas solution

Physica A: Statistical Mechanics and its Applications, 2017
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Kuchma, A. E., Shchekin, A. K., Bulgakov, M. Yu.   +2 more
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Mechanisms of swelling and gas release in uranium dioxide

Journal of Nuclear Materials, 1971
Abstract Data on the external dimensional changes and gas release behavior of uranium dioxide irradiated in tungsten-rhenium claddings at surface temperatures from 1325 to 1900 °C are presented. External dimensional changes and gas release fractions increase with increasing temperatures; but the density of the uranium dioxide shows little change ...
R.F. Hilbert, V.W. Storhok, W. Chubb, D.L. Keller   +3 more
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Fission gas swelling of refractory nuclear fuels

Materials Science and Engineering, 1972
Abstract The external diametral swelling rates of uranium oxides, nitrides and carbides at temperatures of up to 1900°C are presented. Under similar conditions, the swelling rates are seen to increase from approximately 0.2 percent per 1020 fissions per cm3 at 1200°C to 10–30 percent per 1020 fissions per cm3 at 1900°C.
W Chubb, R.F Hilbert, V.W Storhok, D.L Keller   +3 more
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Contribution of polymeric swelling to the overall response of capacitive gas sensors

Analytical and Bioanalytical Chemistry, 2013
A new method for investigation of the swelling of polymers on exposure to gas or vapour has been devised and tested. It uses an optical profilometer (based on the chromatic aberration of a lens system) which is integrated into a computer-controlled gas-dosing and mixing setup. Gas and/or vapour concentration-dependent measurements have been carried out
Altenberend, Ulrike, Oprea, Alexandru, Bârsan, Nicolae, Weimar, Udo   +3 more
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Swelling and gas release in UO2 at low and intermediate temperatures

Journal of Nuclear Materials, 1977
Abstract A model is proposed to describe in-pile fission gas swelling and gas release at temperatures below approximately 1700°C where columnar grain growth is not expected. The model considers fission gas behavior at the grain interior, on the grain boundaries and grain boundary edges under conditions of both total gas bubble destruction by fission ...
C.C. Dollins, F.A. Nichols
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Gas release and swelling in oxide fuel; modeling of the kinetics of gas porosity development

Journal of Nuclear Materials, 1982
Abstract A quantitative model of gas porosity development, gas release and gas swelling in oxide fuel is proposed. In the model the gas porosity evolution is supposed to be caused by the collision and coalescence of moving gas bubbles. The suppression of small gas bubble mobility is taken into account too. For oxide fuel, calculation results are in a
E.Ya. Mikhlin, V.F. Chkuaseli
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Grain Subdivision Fission Gas Swelling Model for UO2

MRS Advances, 2016
Under high burnup UO2 fuel pellets can experience high burnup structure (HBS) at the rim also known as rim effect. The HBS is exceptionally porous with fine grain sizes. HBS increases the swelling further than it would have achieved at a larger grain size.
Thomas Winter, Richard Hoffman, Chaitanya S. Deo   +2 more
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Theories of Swelling and Gas Retention in Ceramic Fuels

Nuclear Applications and Technology, 1970
AbstractThe development of models of fuel-element performance requires, among other things, a detailed, quantitative understanding of fuel swelling and fission gas release.
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A universal nanoscopic swell behavior model for gas shales

Journal of Natural Gas Science and Engineering, 2017
Abstract Hydraulic fracturing to tap unconventional shale gas reservoirs causes a volume change of the active clay minerals matrix in the gas shale structure, resulting in the clogging of the tiny nanopores and consequently undermining the production of the shale gas.
H.R. Ahmed, S.N. Abduljauwad
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