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-	<center>[[File: Skin-logo.png|400px]]</center>	+	<center> [[File: Skin-logo.png|250px]] [[File: EC.jpg|150px]] [[File: EURATOM.jpg|120px]] </center>
-	Solid/liquid chemical equilibrium hypotheses (sorption, solubility, solid-solution formation) are key concepts in the assessment of nuclear waste safety.	+	;<span style="color:#191970"><big><big>About SKIN Project</big></big></span>
		+	----
		+	SKIN project is a 36 months (2011-2013) Collaborative Project under the Seventh Framework Programme of the European Atomic Energy Community (EURATOM). <br >
-	For radionuclides at trace concentrations this corresponds to constant solution concentrations, or solid/liquid distribution ratios, if environmental conditions remain constant. However, these concepts do not account for irreversible incorporation of radionuclides in the solid phases. Indeed, there is often a gradual and very slow transition from simple adsorption processes to incorporation of trace elements in the surface structure of solid phases. For certain tetravalent actinides apparent solubility equilibrium applies to only the surface without bulk phase equilibrium. This can lead to very large uncertainty in solubility values and derived thermodynamic constants.	+	The project will study slow processes influencing radionuclide mobility in close-to-equilibrium scenarios in a detailed and systematic manner in relation to surface properties, surface site detachment/attachment kinetics, irreversible sorption and surface incorporation, for cases relevant to the assessment of radionuclide mobility in nuclear waste repository sites.
-	Equilibrium concepts are characterized by a dynamic state of equal forward and backward reaction rates, under conditions where phase compositions remain constant. Most of the problems arise from a lack of understanding of the dynamics of slow processes close to equilibrium, specifically in the coupling of sorption with other surface equilibrium reactions such as dissolution/precipitation, recrystallisation, isotopic exchange and with the bulk phase equilibrium. The project intends to assess the effect of surface properties on apparent solubility as well as the kinetics of incorporation of radionuclides in the structure of a solid phase, and the associated reaction mechanisms for various solids in a systematic manner, using isotope exchange under close-to-equilibrium conditions.
		+	;<span style="color:#191970"><big><big>Objectives</big></big></span>
		+	----
-	The project results will impact strongly :	+	The objectives of the project are:
		+	* To assess the use/misuse of solubility data of sparingly soluble tetravalent actinides
		+	* To understand the coupling of major and trace element chemistry in radionuclide migration behaviour considering the extremely large exchange pool of natural minerals present in the disposal sites
		+	* To include irreversibility in models on the mobility of radionuclides in the repository environment
		+	* To assess to what degree the ignorance/non-inclusion of these studied slow processes leads, in performance assessment (PA), to over-conservative, or in few cases, even too optimistic evaluations. The inclusion of such processes in [[Private:Acronym|PA]] will also be assessed
-	# the use/misuse of solubility data for thermodynamics;	+
-	# the understanding of affinity/rate relations close to equilibrium;	+	;<span style="color:#191970"><big><big>Partners</big></big></span>
-	# he inclusion of irreversibility in models on the long-term mobility of radionuclides;	+	----
-	# the coupling of radionuclide chemistry with main element chemistry in the repository environment.	+
		+	SKIN project includes 10 [[partners]] (7 countries) from Europe and People's Republic of China.<br >
		+
		+
		+	<center>[[File: Consortium.png|900px|]]</center>

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Latest revision as of 22:34, 7 March 2011

Slow processes in close-to-equilibrium conditions for radionuclides in water/solid systems of relevance to nuclear waste management

About SKIN Project

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SKIN project is a 36 months (2011-2013) Collaborative Project under the Seventh Framework Programme of the European Atomic Energy Community (EURATOM).

The project will study slow processes influencing radionuclide mobility in close-to-equilibrium scenarios in a detailed and systematic manner in relation to surface properties, surface site detachment/attachment kinetics, irreversible sorption and surface incorporation, for cases relevant to the assessment of radionuclide mobility in nuclear waste repository sites.

Objectives

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The objectives of the project are:

• To assess the use/misuse of solubility data of sparingly soluble tetravalent actinides
• To understand the coupling of major and trace element chemistry in radionuclide migration behaviour considering the extremely large exchange pool of natural minerals present in the disposal sites
• To include irreversibility in models on the mobility of radionuclides in the repository environment
• To assess to what degree the ignorance/non-inclusion of these studied slow processes leads, in performance assessment (PA), to over-conservative, or in few cases, even too optimistic evaluations. The inclusion of such processes in PA will also be assessed

Partners

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SKIN project includes 10 partners (7 countries) from Europe and People's Republic of China.