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The Chernobyl pilot site project: Isolation and microscopic characterisation of fuel particles.


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N. Ahamdach Actes du congrès ECORAD, 3-7 sept 2001, Aix en Provence, France Radioprotection - Colloques, volume 37, C1-1055/ C1-1060.

Type de document > *Article de revue

Mots clés > déchets radioactifs : stockage de surface et sites pollués, Tchernobyl

Unité de recherche > IRSN/DEI/SARG/LETS

Auteurs > AHAMDACH Noureddine

Date de publication > 18/06/2002

Résumé

A method of fuel particles separation from contaminated soil samples in heavy liquid was developed. Numerous particles have been isolated and characterised by Scanning Electron Microscopy. 14 years after Chernobyl accident 52% of Cs, 70% of Eu and Sr and 65% of Am still are associated with fuel particles. Hence the source term is mainly represented by fuel particles with a mean diameter of 4.17 µm. The source term consist of 2 types of particles: UO and ZrUO. Zr-U-O fuel particles account for 74% of the studied particles and showed much higher stability. Therefore the description of Chernobyl source term weathering requires 2 dissolution laws: a first one concerning UO particles with a higher dissolution constant and a second one with a low dissolution constant describing Zr-U-O dissolution.