Cement As a Waste Form for Nuclear Fission Products: The Case of 90Sr and Its Daughters

Lucile Dezerald, Jorge J. Kohanoff, Alfredo A. Correa, Alfredo Caro, Roland J.-M. Pellenq, Franz J. Ulm, Andrés Saúl*

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)
228 Downloads (Pure)

Abstract

One of the main challenges faced by the nuclear industry is the long-term confinement of nuclear waste. Because it is inexpensive and easy to manufacture, cement is the material of choice to store large volumes of radioactive materials, in particular the low-level medium-lived fission products. It is therefore of utmost importance to assess the chemical and structural stability of cement containing radioactive species. Here, we use ab initio calculations based on density functional theory (DFT) to study the effects of 90Sr insertion and decay in C-S-H (calcium-silicate-hydrate) in order to test the ability of cement to trap and hold this radioactive fission product and to investigate the consequences of its β-decay on the cement paste structure. We show that 90Sr is stable when it substitutes the Ca2+ ions in C-S-H, and so is its daughter nucleus 90Y after β-decay. Interestingly, 90Zr, daughter of 90Y and final product in the decay sequence, is found to be unstable compared to the bulk phase of the element at zero K but stable when compared to the solvated ion in water. Therefore, cement appears as a suitable waste form for 90Sr storage.

Original languageEnglish
Pages (from-to)13676-13683
Number of pages8
JournalEnvironmental Science and Technology
Volume49
Issue number22
DOIs
Publication statusPublished - 29 Oct 2015

Keywords

  • Cementitious materials
  • Ab initio calculations
  • Nuclear waste
  • Beta decay

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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