Evaluating Chemical Toxicity of Surface Disposal of LILW-SL in Belgium

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Abstract

ONDRAF/NIRAS is developing and evaluating a surface disposal concept for low and intermediate level short-lived radioactive waste (LILW-SL) at Dessel, Belgium. In support of ONDRAF/NIRAS's assignment, SCK•CEN carried out long-term performance assessment calculations for the inorganic non-radioactive components that are present in LILW-SL. This paper summarizes the results obtained from calculations that were done for a heavily engineered surface disposal facility at the nuclear zone of Mol/Dessel. The calculations address the migration of chemotoxic elements from the disposed waste to groundwater. Screening calculations were performed first to decide which non-radioactive components could potentially increase concentrations in groundwater to levels above the groundwater standards. On the basis of very conservative calculations, only 6 out of 41 chemical elements could not be classified as having a negligible impact on man and environment. For each of these six elements (B, Be, Cd, Pb, Sb, and Zn), the source term was characterized in terms of its chemical form (i.e., metal, oxide, or salt), and a macroscopic transport model built that would capture the small-scale dissolution processes relevant to element release from a cementitious waste container.

Details

Original languageEnglish
Title of host publicationSymposium Proceedings. Scientific Basis for Nuclear Waste Management XXXI
Place of PublicationWarrendale, United States
Pages689-701
Publication statusPublished - Sep 2008
EventMRS 2007 - Materials Research Society - UK - Materials Research Society, Sheffield, United Kingdom
Duration: 17 Sep 200723 Sep 2007

Conference

ConferenceMRS 2007 - Materials Research Society - UK
Country/TerritoryUnited Kingdom
CitySheffield
Period2007-09-172007-09-23

Keywords

  • LILW-SL, cat. A waste, surface disposal, non-radiological components, chemotoxicity, screening calculations, source term model

ID: 373797