Technetium-99 Behavior in Savannah River Site High Level Waste Sludges During Waste Processing

Bibler, N.E.; Fellinger, T.L.; Hobbs, D.T.

doi:10.2172/833391

Cited by 11 publications

(13 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This has been shown to be the case for Tc-99 in sludges where the concentration of Tc-99 was considerably less than the predicted concentration if all the Tc-99 had been insoluble in caustic. [18] That study also showed the same effect for Pd-105. [18] In Table 4-1, the results for the prediction by WCS for Ru, Rh, and Pd are significantly higher than the measured.…”

Section: Predicted and Measured Concentrations Of Noble Metal Fissionmentioning

confidence: 52%

“…[18] That study also showed the same effect for Pd-105. [18] In Table 4-1, the results for the prediction by WCS for Ru, Rh, and Pd are significantly higher than the measured. However considering all the tank transfers and canyon receipt records along with the calculations that predict the washing of SB3, the agreement is not bad.…”

Section: Predicted and Measured Concentrations Of Noble Metal Fissionmentioning

confidence: 52%

See 1 more Smart Citation

Measuring and Predicting Fission Product Noble Metals in SRS HLW Sludges

Bibler¹

2005

View full text Add to dashboard Cite

EXECUTIVE SUMMARYThe noble metals Ru, Rh, Pd, and Ag were produced in the Savannah River Site (SRS) reactors as products of the fission of U-235. Consequently they are in the High Level Waste (HLW) sludges that are currently being immobilized into a borosilicate glass in the Defense Waste Processing Facility (DWPF). The noble metals are a concern in the DWPF because they catalyze the decomposition of formic acid used in the process to produce the flammable gas hydrogen. As the concentration of these noble metals in the sludge increases, more hydrogen will be produced when this sludge is processed.a In the SRS Tank Farm it takes approximately two years to prepare a sludge batch for processing in the DWPF. This length of time is necessary to mix the appropriate sludges, blend them to form a sludge batch and then wash it to enable processing in the DWPF. This means that the exact composition of a sludge batch is not known for ~two years. During this time, studies with simulated nonradioactive sludges must be performed to determine the desired DWPF processing parameters for the new sludge batch. Consequently, prediction of the noble metal concentrations is desirable to prepare appropriate simulated sludges for studies of the DWPF process for that sludge batch. These studies give a measure of the amount of hydrogen that will be produced when that sludge batch is processed. This report describes in detail the measurement of these noble metal concentrations in sludges and a way to predict their concentrations from an estimate of the lanthanum concentration in the sludge. Results for two sludges are presented in this report. These are Sludge Batch 3 (SB3) currently being processed by the DWPF and a sample of unwashed sludge from Tank 11 that will be

show abstract

Section: Predicted and Measured Concentrations Of Noble Metal Fissionmentioning

confidence: 52%

Section: Predicted and Measured Concentrations Of Noble Metal Fissionmentioning

confidence: 52%

Measuring and Predicting Fission Product Noble Metals in SRS HLW Sludges

Bibler¹

2005

View full text Add to dashboard Cite

show abstract

“…A previous study with SB3 also indicated a low concentration of Tc-99 in the sludge solids. 15 The radionuclide I-129 is a U-235 fission product with a long half life of 1.6 × 10 7 years. Previously it has only been measured successfully in the Sludge Batch 4 and 5 (SB4, SB5) Waste Acceptance Product Specifications (WAPS) studies 9,11 and SB5 Acceptance Evaluation 16 , where its concentration was reported.…”

Section: Resultsmentioning

confidence: 99%

Sludge Batch 5 Acceptance Evaluation Radionuclide Concentrations in Tank 51 Sb5 Qualification Sample Prepared at SRNL

Bannochie¹,

Bibler²,

Diprete³

2008

View full text Add to dashboard Cite

“…In SRS waste, the majority of technetium is typically soluble as a pertechnetate anion and therefore dominant in salt streams. 25,26 Still, the minor portions of Tc-99 that are associated with insoluble solids (likely in the form of hydrated technetium dioxide) are almost always present at detectable concentrations. In Hanford waste, the presence of chelation agents may increase the fraction of technetium partitioning to the liquid phase.…”

Section: Potential Scaling Of Radionuclidesmentioning

confidence: 99%

Potential Application Of Radionuclide Scaling Factors To High Level Waste Characterization

Reboul

2013

View full text Add to dashboard Cite

Technetium-99 Behavior in Savannah River Site High Level Waste Sludges During Waste Processing

Cited by 11 publications

References 12 publications

Measuring and Predicting Fission Product Noble Metals in SRS HLW Sludges

Measuring and Predicting Fission Product Noble Metals in SRS HLW Sludges

Sludge Batch 5 Acceptance Evaluation Radionuclide Concentrations in Tank 51 Sb5 Qualification Sample Prepared at SRNL

Potential Application Of Radionuclide Scaling Factors To High Level Waste Characterization

Contact Info

Product

Resources

About