This paper presents the data selection strategy and the selected sorption values on cement for twenty-five elements (Ag, Am, Be, C, Ca, Cl, Cs, H, I, Mo, Nb, Ni, Np, Pa, Pb, Pd, Pu, Ra, Sr, Se, Sn, Tc, Th, U, Zr) that need to be considered in safety assessment calculations for the future near-surface disposal facility at Dessel, Belgium. [Wang Lian] Based on literature data, best estimate values, upper and lower bound values were determined for a socalled benchmark cement – the unperturbed cement without effects of organics, high chloride content or other chemical components that might adversely impact radionuclide sorption. Effects of perturbing components are discussed separately. The geochemical evolution of the cementitious engineered barriers was addressed to clarify the conditions under which sorption values are applicable. A substantial part of the scientific basis supporting the data selection was established at meetings of an International Panel of Experts who reviewed and endorsed the data selection. To this end, the sorption data were checked for: reliability, appropriateness[Wang Lian] , data quality, time frames (i.e. states of cement degradation), heterogeneity ([Wang Lian] influence of [Wang Lian] non-cement) and completeness (in terms of mechanisms [Wang Lian] involved).
|Title of host publication||Proceedings 1st International Symposium on Cement-based Materials for Nuclear Wastes. NUWCEM 2011|
|Place of Publication||Marcoule, France|
|State||Published - Oct 2011|
|Event||1st International Symposium on Cement-based Materials for Nuclear Wastes - CEA énergie atomique – énergie alternative and SFEN, Avignon|
Duration: 11 Oct 2011 → 13 Oct 2011
|Conference||1st International Symposium on Cement-based Materials for Nuclear Wastes|
|Period||2011-10-11 → 2011-10-13|