Chemical alteration processes for uranium migration and their significance on uranium isotopic ratio changes

2019 ◽  
pp. 1-13 ◽  
Author(s):  
A. F. Tawfic ◽  
Hamed I. Mira ◽  
Ahmed M. Omar
Keyword(s):  
Isotopic Ratio ◽  
Chemical Alteration ◽  
Uranium Migration ◽  
Alteration Processes

Alteration processes recorded by back‐arc mantle peridotites from oceanic core complexes, Shikoku Basin, Philippine Sea

Island Arc ◽  
2021 ◽  
Author(s):  
Ken‐ichi Hirauchi ◽  
Izumi Segawa ◽  
Yui Kouketsu ◽  
Yumiko Harigane ◽  
Yasuhiko Ohara ◽  
...  
Keyword(s):  
Philippine Sea ◽  
Shikoku Basin ◽  
Mantle Peridotites ◽  
Alteration Processes ◽  
Back Arc

scholarly journals Long-Term Aging of Chernobyl Fuel Debris: Corium and “Lava”

2021 ◽  
Vol 13 (3) ◽  
pp. 1073
Author(s):  
Bella Zubekhina ◽  
Boris Burakov ◽  
Ekaterina Silanteva ◽  
Yuri Petrov ◽  
Vasiliy Yapaskurt ◽  
...  
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Mass Loss ◽  
Nuclear Power ◽  
Distilled Water ◽  
Chemical Alteration ◽  
Laboratory Conditions ◽  
Fukushima Daiichi ◽  
Important Basis

Samples of Chernobyl fuel debris, including massive corium and “lava” were collected inside the Chernobyl “Sarcophagus” or “Shelter” in 1990, transported to Leningrad (St. Petersburg) and stored under laboratory conditions for many years. In 2011 aged samples were visually re-examined and it was confirmed that most of them remained intact, although some evidence of self-destruction and chemical alteration were clearly observed. Selected samples of corium and “lava” were affected by static leaching at temperatures of 25, 90 and 150 °C in distilled water. A normalized Pu mass loss (NLPu) from corium samples after 140 days was noted to be 0.5 g/m2 at 25 °C and 1.1 g/m2 at 90 °C. For “lava” samples NLPu was 2.2–2.3 g/m2 at 90 °C for 140 days. The formation of secondary uranyl phases on the surface of corium and “lava” samples altered at 150 °C was confirmed. The results obtained are considered as an important basis for the simulation of fuel debris aging at Fukushima Daiichi nuclear power plant (NPP).

Uranium migration through intact sandstone: effect of pollutant concentration and the reversibility of uptake

1996 ◽  
Vol 21 (1-4) ◽  
pp. 215-228 ◽  
Author(s):  
R. Sims ◽  
T.A. Lawless ◽  
J.L. Alexander ◽  
D.G. Bennett ◽  
D. Read
Keyword(s):  
Pollutant Concentration ◽  
Uranium Migration
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