Corrosion of commercial spent nuclear fuel. 2. Radiochemical analyses of metastudtite and leachates

2005 ◽  
Vol 93 (3) ◽  
Author(s):  
Bruce McNamara ◽  
Brady D. Hanson ◽  
Edgar C. Buck ◽  
Chuck Soderquist
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Deionized Water ◽  
Corrosion Products ◽  
Contact Period ◽  
Water Interface ◽  
X Ray Diffraction ◽  
X Ray ◽  
Air Water Interface

SummaryImmersing commercial spent nuclear fuel (CSNF) in deionized water produced two corrosion products after a 2-year contact period. Suspensions of aggregates were observed to form at the air–water interface for each of five samples. These suspended aggregates were characterized by X-ray diffraction (XRD) to be metastudtite (UO

scholarly journals Water corrosion of spent nuclear fuel: radiolysis driven dissolution at the UO2/water interface

2015 ◽  
Vol 180 ◽  
pp. 301-311 ◽  
Author(s):  
Ross Springell ◽  
Sophie Rennie ◽  
Leila Costelle ◽  
James Darnbrough ◽  
Camilla Stitt ◽  
...  
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Complex Surface ◽  
Water Interface ◽  
X Ray Diffraction ◽  
Synchrotron Source ◽  
X Ray ◽  
Radiation Fields ◽  
Long Term Storage ◽  
Rate Of Dissolution

X-ray diffraction has been used to probe the radiolytic corrosion of uranium dioxide. Single crystal thin films of UO2 were exposed to an intense X-ray beam at a synchrotron source in the presence of water, in order to simultaneously provide radiation fields required to split the water into highly oxidising radiolytic products, and to probe the crystal structure and composition of the UO2 layer, and the morphology of the UO2/water interface. By modeling the electron density, surface roughness and layer thickness, we have been able to reproduce the observed reflectivity and diffraction profiles and detect changes in oxide composition and rate of dissolution at the Ångström level, over a timescale of several minutes. A finite element calculation of the highly oxidising hydrogen peroxide product suggests that a more complex surface interaction than simple reaction with H2O2 is responsible for an enhancement in the corrosion rate directly at the interface of water and UO2, and this may impact on models of long-term storage of spent nuclear fuel.

Inorganic mixed phase templated by a fatty acid monolayer at the air–water interface: the Mn and Mg case

2018 ◽  
Vol 20 (9) ◽  
pp. 6629-6637 ◽  
Author(s):  
Alae El Haitami ◽  
Michel Goldmann ◽  
Philippe Fontaine ◽  
Marie-Claude Fauré ◽  
Sophie Cantin
Keyword(s):  
Grazing Incidence ◽  
Water Interface ◽  
X Ray Diffraction ◽  
Inorganic Layer ◽  
X Ray ◽  
First Order ◽  
First Order Phase Transition ◽  
Air Water Interface ◽  
First Order Phase

A first-order phase transition with a peculiar feature is evidenced by means of in situ grazing incidence X-ray diffraction in the 2D organic phase-mediated nucleation of an inorganic layer.

X-ray diffraction from a single layer of purple membrane at the air/water interface

1999 ◽  
Vol 287 (5) ◽  
pp. 837-843 ◽  
Author(s):  
Stephan A.W Verclas ◽  
Paul B Howes ◽  
Kristian Kjaer ◽  
Angelika Wurlitzer ◽  
Markus Weygand ◽  
...  
Keyword(s):  
Single Layer ◽  
Purple Membrane ◽  
Water Interface ◽  
X Ray Diffraction ◽  
X Ray ◽  
Air Water Interface

The Structure and Phases of a Relaxed Langmuir Monolayer of Methyl Eicosanoate as Determined by Grazing Incidence Xray Diffraction and Brewster Angle Microscopy

1994 ◽  
Vol 375 ◽  
Author(s):  
W. J. Foster ◽  
M. C. Shih ◽  
P. S. Pershan
Keyword(s):  
Molecular Structure ◽  
Phase Diagram ◽  
Grazing Incidence ◽  
Brewster Angle ◽  
Water Interface ◽  
Brewster Angle Microscopy ◽  
X Ray Diffraction ◽  
Monolayer Films ◽  
X Ray ◽  
Air Water Interface

AbstractThe molecular structure and phase diagram of relaxed monolayer films of methyl eicosanoate at the air/water interface were studied using x-ray diffraction and Brewster Angle Microscopy. Six phases have been identified in relaxed films in a temperature range of 5 to 28 degrees Celsius.

Ceramic Immobilisation Options for Technetium

2012 ◽  
Vol 1518 ◽  
pp. 111-116 ◽  
Author(s):  
Martin C. Stennett ◽  
Daniel J. Backhouse ◽  
Colin L. Freeman ◽  
Neil C. Hyatt
Keyword(s):  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
High Mobility ◽  
X Ray Diffraction ◽  
Host Matrix ◽  
X Ray ◽  
Separate Fraction ◽  
X Ray Absorption ◽  
Snf Reprocessing

ABSTRACTTechnetium-99 (99Tc) is a fission product produced during the burning of nuclear fuel and is particularly hazardous due to its long half life (210000 years), relatively high content in nuclear fuel (approx. 1 kg per ton of SNF), low sorption, and high mobility in aerobic environments. During spent nuclear fuel (SNF) reprocessing Tc is released either as a separate fraction or in complexes with actinides and zirconium. Although Tc has historically been discharged into the marine environment more stringent regulations mean that the preferred long term option is to immobilise Tc in a highly stable and durable matrix. This study investigated the feasibility of incorporating of Mo (as a Tc analogue) in a crystalline host matrix, synthesis by solid state synthesis under different atmospheres. Samples have been characterised with X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray absorption spectroscopy (XAS).

Study of 2D Phase Transition of Polar Organic Dye Molecules at the Air-Water Interface by Using Granzing-Incidence X-Ray Diffraction

2003 ◽  
Vol 286 (1) ◽  
pp. 199-204 ◽  
Author(s):  
Noritaka Kato ◽  
Ichiro Hirosawa ◽  
Masugu Sato ◽  
Naoshi Ikeda ◽  
Yoshiaki Uesu
Keyword(s):  
Phase Transition ◽  
Organic Dye ◽  
Water Interface ◽  
Dye Molecules ◽  
X Ray Diffraction ◽  
X Ray ◽  
Air Water Interface
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