Comparison of the Leachability of Three TRU Cement Waste Forms

Ross, W.A.; Westsik, Joseph H.; Roberts, F.P.; Harvey, C.O.

doi:10.1557/proc-15-175

MRS Proc.

1982

DOI: 10.1557/proc-15-175

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Comparison of the Leachability of Three TRU Cement Waste Forms

W.A. Ross

Joseph H. Westsik

F.P. Roberts

et al.

Abstract: Cement waste forms prepared by three processes, casting, cold pressing, and FUETAP (Formed Under Elevated Temperatures and Pressure) have been compared for their leachability by using the MCC-1 leach test. The results indicate that releases of plutonium are not controlled by the waste form matrix and that there is no significant overall advantage to any of the three cement processes from a leachability viewpoint.

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Near-field solubility constraints on radionuclide mobilization and their influence on waste package design

Chapman

Flowers

1986

Phil. Trans. R. Soc. Lond. A

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The paper addresses the physical and chemical processes that can serve to immobilize waste radionuclides within the confines of an underground repository. These processes, which can be made largely independent of the chemical nature of the host rock, depend for their efficacy upon the maintenance of a very low flow rate of groundwater through the repository constituents. The very long-lived waste products, in particular the actinides, are very insoluble in water under conditions of alkalinity and oxygen potential that will exist in a repository when cement is used as a backfill or as a matrix for the waste. The same chemical conditions tend to favour a fairly long life for steel containers. The paper suggests how these factors may be used to immobilize wastes and draws some conclusions on the relative value of the various engineered features of a repository. Some natural geological analogues are explored as a means of assisting the extrapolation of waste behaviour over very long times.

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Near-field solubility constraints on radionuclide mobilization and their influence on waste package design

Chapman

Flowers

1986

Phil. Trans. R. Soc. Lond. A

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Comparison of 200 Liter and 40 Milliliter Leach Tests

et al. 1982

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During the past year we have conducted a modified MCC-1 leach test on a 145 kg block of a cast cement waste form. The leach vessel was a 200 liter Teflon®-lined drum and contained 97.5 liters of deionized water. The results of this large-scale leach test were compared with the results of standard MCC-1 tests (40 ml) on smaller samples of the same waste form. The ratio of leachate volumes between the large and small scale tests was 2500 and the ratio of sample masses was 150,000. The cast cement samples for both tests contained plutonium-doped incinerator ash.The leachates from these tests were analyzed for both plutonium and the matrix elements. Evaluation of plutonium plateout in the large-scale test indicated that the majority of the plutonium leached from the samples deposits onto vessel walls and little (<3 × 10−12M) remains in solution. Comparison of elemental concentrations in the leachates indicates some differences up to 5X in the concentration in the large- and small-scale tests. The differences are attributed to differences in the solubilities of Ca, Si, and Fe at pH ˜11.5 and at pH ˜12.5. The higher pH observed for the large-scale test is a result of the larger quantities of sodium in the large block of cement.

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Comparison of the Leachability of Three TRU Cement Waste Forms

Cited by 2 publications

References 1 publication

Near-field solubility constraints on radionuclide mobilization and their influence on waste package design

Near-field solubility constraints on radionuclide mobilization and their influence on waste package design

Comparison of 200 Liter and 40 Milliliter Leach Tests

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