Chemical Differences Between Sludge Solids at the F and H Area Tank Farms

Reboul, S.

doi:10.2172/1050233

Cited by 2 publications

(3 citation statements)

References 21 publications

(13 reference statements)

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“…18 Current plutonium concentrations in tank waste on a molar or weight percent basis are typically lower than uranium by at least an order of magnitude, but based on activities (rather than molar concentrations or weight percent) the total activity from plutonium isotopes is typically at least two orders of magnitude higher than the activities from uranium isotopes. 19 Other actinides, such as thorium, neptunium, americium, and curium will be present in the recycle stream at levels dependent upon their concentrations in the DWPF sludge batch feed stream and the degree of entrainment into the recycle condensate stream. The activities of americium and curium isotopes can approach the plutonium isotope activity in some tanks.…”

Section: Fate Of Actinide Elements During Dwpf Recycle Diversionmentioning

confidence: 99%

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Evaluations of the Fates of Alkali Metals, Actinides, Mercury, and Iodine During DWPF Recycle Diversion

King

McCabe

HUNTER

et al. 2021

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The fates of alkali metals, actinides, mercury, and iodine in the Defense Waste Processing Facility Recycle Diversion process (as currently conceptualized) have been evaluated through paper studies based on available knowledge of the chemistry, physical properties, solubility, and volatility of the various species involved. The effect of pH in the range from 9 to 13 has been discussed. Recommendations for additional studies to close technology gaps have been provided, many of which are contingent upon the results of pending testing and sample characterization efforts. There is uncertainty in the amounts of soluble actinides passing through the process filter, though the bulk of the actinides should be captured on the filter with the Recycle Collection Tank solids and the total amounts of actinides should be relatively low. The Recycle Collection Tank pH could impact the fraction of actinides reaching the evaporator, but the primary factors determining the actinide fate are expected to be the amount of CO2 sorption from air sparging or, for certain actinides (such as plutonium), oxidation and/or sorption to MnO2 solids from permanganate additions to destroy the glycolate anion. Process optimization could minimize the amounts of actinides passing the filter. Depending upon the levels of mercury observed in recycle stream samples and because of the volatility of mercury, the evaporator should be designed with the capability to remove dense mercury phases from the condensate to avoid exceeding ETP WAC limits. The facility design must be adequate to transfer dense mercury phases and testing to confirm mercury transfer is needed. Simulant containing mercury is recommended for both filtration and evaporation testing. OLI Modeling of the various recycle streams is recommended to provide insight on the fate of iodine. Iodine-spiked simulants are recommended for upcoming evaporation tests. The project should consider the likelihood and impact of NAS scale formation in the evaporators. Process optimization may be needed to minimize the accumulation of NAS scale and possibly the sorption of actinides in the evaporator. Actual waste testing of the Recycle Diversion filtration and evaporation should include the analysis of actinides, mercury, and iodine to determine their partitioning.

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Section: Fate Of Actinide Elements During Dwpf Recycle Diversionmentioning

confidence: 99%

“…The activities of americium and curium isotopes can approach the plutonium isotope activity in some tanks. 19 Most of the discussion on the fates of the actinides focuses on uranium and plutonium.…”

Section: Fate Of Actinide Elements During Dwpf Recycle Diversionmentioning

confidence: 99%

Evaluations of the Fates of Alkali Metals, Actinides, Mercury, and Iodine During DWPF Recycle Diversion

King

McCabe

HUNTER

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The relative radionuclide solubilities and distributions were taken from a series of references: reports addressing characterization of DWPF sludge batches, [6][7][8][9][10][11][12][13] reports addressing characterization of Tank Farm saltcake and supernatant, [14][15][16] and miscellaneous reports focusing on concentrations and distributions of specific radionuclides. [17][18][19] Since the primary sources of fission products in SRS waste are from fission of U-235 used to generate neutrons and fission of U-235 in uranium irradiated to generate Pu-239, all of the fission yields identified in this report are those applicable to U-235, as opposed to those applicable to U-233 or Pu-239. (With few exceptions, the majority of Hanford fission products have also been generated through fission of U-235).…”

Section: Potential Scaling Of Radionuclidesmentioning

confidence: 99%

Potential Application Of Radionuclide Scaling Factors To High Level Waste Characterization

Reboul

2013

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Chemical Differences Between Sludge Solids at the F and H Area Tank Farms

Cited by 2 publications

References 21 publications

Evaluations of the Fates of Alkali Metals, Actinides, Mercury, and Iodine During DWPF Recycle Diversion

Evaluations of the Fates of Alkali Metals, Actinides, Mercury, and Iodine During DWPF Recycle Diversion

Potential Application Of Radionuclide Scaling Factors To High Level Waste Characterization

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