Journal ArticleDOI
In-situ neutron radiography investigations of hydrogen diffusion and absorption in zirconium alloys
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In this paper, the results of in-situ neutron radiography investigations of hydrogen diffusion and absorption are presented, and a linear dependence of the total macroscopic neutron cross section on the H/Zr atomic ratio as well as on the oxygen concentration is found.Abstract:
The fast and non-destructive character of neutron radiography provides the possibility of in-situ investigations of hydrogen uptake and diffusion in zirconium alloys. A special reaction furnace with neutron transparent windows was constructed. The method of quantitative hydrogen determination by neutron transmission measurements was calibrated for each experimental run. Additionally, oxygen is absorbed in the α-Zr phase and precipitated in the oxide layer. The calibration of the correlation between hydrogen and oxygen concentrations and total neutron cross-sections at room temperature and between 1123 and 1623 K are described. Results of in-situ neutron radiography investigations of hydrogen diffusion and absorption are presented in this paper. A linear dependence of the total macroscopic neutron cross section on the H/Zr atomic ratio as well as on the oxygen concentration was found. No significant temperature dependence of the total neutron cross-sections of hydrogen dissolved in β-Zr or oxygen dissolved in the α-Zr or precipitated in the oxide layer was found.read more
Citations
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Non-destructive studies of fuel pellets by neutron resonance absorption radiography and thermal neutron radiography
Anton S. Tremsin,Sven C. Vogel,Michal Mocko,Mark A.M. Bourke,V.W. Yuan,R. O. Nelson,Donald W. Brown,W.B. Feller +7 more
TL;DR: In this paper, the authors present the proof-of-principle of high-resolution neutron resonance absorption imaging (NRAI) and transmission Bragg edge imaging performed at Flight Path 5 (FP5) at the LANSCE pulsed, moderated neutron source of Los Alamos National Laboratory.
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The use of ionising radiation to image nuclear fuel: A review
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Journal ArticleDOI
Applications of Neutron Radiography for the Nuclear Power Industry
Aaron E. Craft,John P. Barton +1 more
TL;DR: In this article, applications of neutron radiography techniques developed and applied internationally for the nuclear power industry since the earliest years are reviewed, and the question is asked whether neutron test techniques, in general, can be of value in development of the present and future generations of nuclear power plants world-wide.
Journal ArticleDOI
Hydrogen diffusion and precipitation in duplex zirconium nuclear fuel cladding quantified by high-resolution neutron imaging
Weijia Gong,Pavel Trtik,A.W. Colldeweih,Liliana I. Duarte,Mirco Grosse,Eberhard Lehmann,Johannes Bertsch +6 more
TL;DR: In this paper, a duplex cladding, with a 150μm external layer of low-tin Zircaloy-4, so-called liner, bonded to an inner standard substrate, was measured using a state-of-the-art neutron imaging setup of PSI Neutron Microscope with an effective spatial resolution of 9.6
Journal ArticleDOI
Determination of very low concentrations of hydrogen in zirconium alloys by neutron imaging
N.L. Buitrago,J.R. Santisteban,Aureliano Tartaglione,J. Marín,L. Barrow,Mark R. Daymond,Michael Schulz,Mirco Grosse,Anton S. Tremsin,Eberhard Lehmann,Anders Kaestner,Joe Kelleher,Saurabh Kabra +12 more
TL;DR: In this article, the spatial distribution of H in Zr alloys specimens with a resolution of ∼5.5 kg, an accuracy of ∼10 kg, and a spatial resolution of ≥25 kg.
References
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Journal ArticleDOI
Neutron scattering lengths and cross sections
TL;DR: The application of thermal neutron scattering to the study of the structure and dynamics of condensed matter requires a knowledge of the scattering lengths and the corresponding scattering and absorption cross sections of the elements as discussed by the authors.
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Synopsis and outcome of the QUENCH experimental program
TL;DR: The QUENCH program at the Karlsruhe Institute of Technology (KIT) as mentioned in this paper has performed 15 integral bundle experiments with 21-31 electrically heated fuel rod simulators of 2.5-m length.
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Influence of oxide layer morphology on hydrogen concentration in tin and niobium containing zirconium alloys after high temperature steam oxidation
TL;DR: The influence of the oxide layer morphology on the hydrogen uptake during steam oxidation of (Zr,Sn) and Zr-Nb nuclear fuel rod cladding alloys was investigated in isothermal separate-effect tests and large-scale fuel rod bundle simulation experiments as discussed by the authors.
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Hydrogen absorption by zirconium alloys at high temperatures
TL;DR: In this paper, the authors measured the hydrogen solubility of Zircaloy-4 and Zr-1Nb at hydrogen partial pressures between 10 and 100 kPa and found no significant differences between the two alloys.
Journal ArticleDOI
Kinetics of Hydrogen Absorption and Release in Zirconium Alloys During Steam Oxidation
TL;DR: In this paper, the initial phase is controlled by the hydrogen diffusion through the growing oxide layer and the state of equilibrium is established between the hydrogen content of the gas environment and the metal phases.