Studies of the radioactive waste confinement matrix using neutron scattering methods

6th European Conference on Neutron Scattering

Dragolici, C.A.^1 ; Balasoiu, M.^1 ; Ionascu, L.^1 ; Nicu, M.^1

Horia Hulubei National Institute for RandD in Physics and Nuclear Engineering, 30 Reactorului Street, P.O. BOX MG-6, Bucharest-Magurele, Romania^1

关键词: Cement matrix;    Corrosion products;    Decommissioning activities;    Porous microstructure;    Waste forms;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012045/pdf
DOI  :  10.1088/1742-6596/746/1/012045

来源: IOP

【 摘 要 】

The management of the radioactive waste implies the conditioning in a cement matrix as an embedding, stable, disposal material. Cement matrix is the first and most important engineering barrier against the migration in the environment of the radionuclides contained in the packages. Chemically, after mixing with water, cement produces a reacting matrix with a porous microstructure. Knowing how the microstructure develops is therefore desirable in order to assess the compatibility of radioactive streams with cement and predict waste form performance during storage and disposal. This article highlights the work performed in SANS investigation of a new type of cements to be used for conditioning of aluminium waste coming from reactor decommissioning activities. It is well known that the expansion of corrosion products formed on aluminium can lead to cracking of the waste form.