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Periá,ñ,ez, R.,Suh, Kyung-Suk,Min, Byung-Il,Villa-Alfageme, M. Elsevier 2018 The Science of the total environment Vol.626 No.-
<P><B>Abstract</B></P> <P>A numerical model, previously validated with other radionuclides, was applied to simulate the dispersion of <SUP>236</SUP>U released from European nuclear fuel reprocessing plants in the North Atlantic and Shelf Seas using a published reconstruction of Sellafield and La Hague releases. Model results are in better agreement with observations if the lowest estimation of such releases are used. This implies that approximately 40kg of <SUP>236</SUP>U has been discharged from Sellafield. It was found that adsorption of <SUP>236</SUP>U on bed sediments of the shallow European Shelf Seas plays an essential role in its dispersion patterns. This contrasts strongly with the more conservative behaviour of <SUP>129</SUP>I in the same area. This has two important implications in the use of <SUP>236</SUP>U as oceanographic tracer; i) special care must be taken in coastal areas, as sediments might act as sinks and sources of <SUP>236</SUP>U; ii) the annual input function of <SUP>236</SUP>U into the Arctic is not directly controlled by the annual discharges from Sellafield and La Hague, since sediments from the Irish, Celtic and North Sea modulate and smooth the signal. Only 52% of the total releases enter into the Arctic Ocean.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Calculated <SUP>236</SUP>U concentrations in water and sediments compared with measurements. </LI> <LI> Adsorption of <SUP>236</SUP>U in bed sediments is significant. </LI> <LI> Releases from Sellafield estimated as 40kg of <SUP>236</SUP>U for period 1952–2013 </LI> <LI> Only 52% of the total releases from the three nuclear facilities are introduced into the Arctic. </LI> <LI> Input function into the Arctic reconstructed: total of 38 ± 8kg of <SUP>236</SUP>U for period 1952–2013. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>