| Autor: |
Wilmarth, W. R., King, W. D., Nash, C. A., Fondeur, F. F., Rosencrance, S. W., DiPrete, D. P., DiPrete, C. C., Zamecnik, J. R., Baich, M. A., Williams, M. R., Steeper, T. J. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2003, Vol. 673 Issue 1, p332, 4p |
| Abstrakt: |
Plutonium and americium are present in the Hanford High-Level Liquid Waste complexant concentrate (CC) waste as a result of the presence of complexing agents, including di-(2-ethylhexyi) phosphoric acid (D[sub2]EHPA), tributylphosphate (TBP), hydroxyethylene diamine triacetic acid (HEDTA), ethylene diamine tetraacetic acid (EDTA), citric acid, glycolic acid, and sodium gluconate. The transuranic (TRU) concentrations approach 600 nCi/g and require processing before encapsulation into low-activity glass. The Savannah River Technology Center (SRTC) has been actively participating in the development of a strontium/TRU decontamination process for the CC waste stored at Hanford in Tanks AN-107 and AN-102. The current baseline flowsheet involves the addition of strontium nitrate to effectively remove radio-strontium through an isotopic dilution, followed by a sodium permanganate strike to coprecipitate the actinides in the in-situ-produced manganese solid phases. Demonstration efforts to validate the Sr/TRU flowsheet have included beaker-scale reagent optimization and reaction kinetics testing and engineering scale-up experiments at the multiliter and 1/100th-plant scale (200 gallon) using both simulated and actual waste samples. Several key process engineering and process chemistry needs were identified during a recent Hanford Waste Treatment Plant project risk review. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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