Results 211 to 220 of about 62,698 (248)

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
openaire   +1 more source

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
openaire   +3 more sources

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
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

Re-solution effects and fission gas swelling in UO2

Journal of Nuclear Materials, 1972
Abstract A fission gas swelling model is proposed which enables one to calculate swelling in the vicinity of grain boundary networks and in imperfection-free regions. The grain boundary swelling requires a knowledge of the gas accumulation and the reaction-rate at the boundary. The gas accumulation was calculated by deriving a modified form of Fick's
C.C. Dollins, H. Ocken
openaire   +1 more source

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.
openaire   +1 more source

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
openaire   +1 more source

A theory of swelling and gas release for reactor materials

Journal of Nuclear Materials, 1964
Abstract The physical mechanisms deduced from the direct observation of inert gas bubbles in the electron microscope are used to evolve a model, or theory, for swelling. The model assumes the insolubility of the inert gases and the bodily migration of the gas bubbles, and relies upon the equation of state for the inert gas, upon the surface energy ...
openaire   +1 more source

A Statistical Fuel Swelling and Fission Gas Release Model

Nuclear Applications and Technology, 1970
AbstractA computer simulation of a fuel region has been developed based on movement of fission gas bubbles in solids under a thermal gradient. Within this region, fission gas events are followed via a Monte Carlo technique. Individual bubbles are followed through their time history from nucleation to release from the fuel, with interactions at ...
H. R. Warner, F. A. Nichols
openaire   +1 more source