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

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.

Efficient masking of corrosion and fission products such as Ni(II) and Pd(II) in the presence of the minor actinide Am(III) using hydrophilic anionic or cationic bis-triazines

Water soluble anionic and cationic bis-triazine ligands are able to suppress (mask) the extraction of corrosion and fission products such as Ni(II) and Pd(II) that are found in PUREX raffinates. Thus it is possible to separate these elements from the minor actinide Am(III). Although some masking agents have previously been developed that retard the extraction of Pd(II), this is the first time a masking agent has been developed for Ni(II).

Fission products decay energy : a literature search /

"September 1959."

Progress report on plant studies: the fixation and absorption of fission products by plants /

Bibliography: p. 6.

Fixation of fission products : a literature search /

"May 1960."

A review of information on the gamma energy radiation rate from fission products, and its significance for studies of radioactive fallout /

"April 24, 1959."

Soil and plant relationships of fission products /

"Prepared for Presentation at the Hearings on Fallout Before the Joint Committee on Atomic Energy, May 5-8, 1959."

Utilization of the gross fission products : progress report no. 1, for the period June 1, 1951, to December 31, 1951 /

"Contract AT W-31-109-eng-52."

Utilization of gross fission products : a bibliography of unclassified report literature /

"February 1954."

Reprocessing of irradiated fission reactor fuel and breeding material : a literature search /

"January 1960."

Reprocessing of irradiated fission reactor fuel and breeding material : a literature search /

"October 1961."

Bombardment energy and fission product yield pattern : protons on Th-232, U-233, and Th-230 /

"Contract No. AT(40-1)-1399."

Radiation application and fission product utilization : a bibliography of selected unclassified literature /

"Office of Isotopes Development, U.S. Atomic Energy Commission."