Analysis of DWPF Sludge Batch 6 (Macrobatch 7) Pour Stream Glass Samples

Johnson, F. C.

doi:10.2172/1035774

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…The second observation concerns the rinsates from SB5 and SB6 pour stream glass samples that have been positive for SO 4 2-thus indicating there is S in the melter that is not being incorporated into the glass matrix or forming on the glass surface upon cooling. 13,14 The latter was observed throughout DWPF cold runs. …”

Section: Path Forwardmentioning

confidence: 86%

Examination Of Sulfur Measurements In DWPF Sludge Slurry And SRAT Product Materials

Bannochie¹,

Wiedenman²

2012

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Section: Path Forwardmentioning

confidence: 86%

Examination Of Sulfur Measurements In DWPF Sludge Slurry And SRAT Product Materials

Bannochie¹,

Wiedenman²

2012

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“…j Noble metal inclusions have been observed in previous pour stream samples from SB4 through SB7a. 20,24,25…”

Section: Element Wdf Concentration (Wt%)mentioning

confidence: 99%

Analysis of the Sludge Batch 7b (Macrobatch 9) DWPF Pour Stream Glass Sample

Johnson

Pareizs

Crawford

2020

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The Defense Waste Processing Facility (DWPF) began processing Sludge Batch 7b (SB7b), also referred to as Macrobatch 9 (MB9), in January 2012. SB7b is a blend of the heel of Tank 40 from Sludge Batch 7a (SB7a) and the SB7b material that was transferred to Tank 40 from Tank 51. SB7b was processed using Frit 418. During processing of each sludge batch, the DWPF is required to take at least one glass sample to meet the objectives of the Glass Product Control Program (GPCP), which is governed by the DWPF Waste Form Compliance Plan, and to complete the necessary Production Records so that the final glass product may be disposed of at a Federal Repository. Two pour stream glass samples were collected while processing SB7b. The samples were transferred to the Savannah River National Laboratory (SRNL) where one was analyzed and the other was archived. The following conclusions were drawn from the analytical results provided in this report:  The sum of oxides for the official SB7b pour stream glass is within the Product Composition Control System (PCCS) limits (95-105 wt%).  The average calculated Waste Dilution Factor (WDF) for SB7b is 2.3. In general, the measured radionuclide content of the official SB7b pour stream glass is in good agreement with the calculated values from the Tank 40 dried sludge results from the SB7b Waste Acceptance Program Specification (WAPS) sample.  As in previous pour stream samples, ruthenium and rhodium inclusions were detected by Scanning Electron Microscopy-Electron Dispersive Spectroscopy (SEM-EDS) in the SB7b pour stream sample.  The Product Consistency Test (PCT) results indicate that the official SB7b pour stream glass meets the waste acceptance criteria for durability with a normalized boron release of 0.8 g/L, which is an order of magnitude less than the Environmental Assessment (EA) glass.  The measured density of the SB7b pour stream glass was 2.70 g/cm 3.  The Fe 2+ /∑Fe ratio of the SB7b pour stream samples was 0.07.

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“…It should be noted that the reported SB6 pour stream composition was obtained by averaging the eight replicates, four each from aqua regia (AR) and sodium peroxide fusion (PF) sample dissolution preparations except for Ca, K, Na, S and Zr by AR only and Si by PF only. 5 On the other hand, the pour stream composition shown in Table 6 is based only on the AR results except for Si with the aim of maintaining analytical consistency; more importantly, it resulted in entrainment rates that seem less conservative.…”

Section: Elemental Entrainment Ratesmentioning

confidence: 99%

“…Specifically, during each sludge batch (SB) campaign, the DWPF is required to take at least one glass sample to meet the objectives of the Glass Product Control Program (GPCP) and to complete the necessary Production Records so that the final glass product may be disposed of at a Federal Repository. 5 So the focus of this study was to determine whether reasonable entrainment rates could be obtained by performing a mass balance between the feed and glass pour streams based on their measured compositions and rates. If successful, the results of all nine DWPF pour stream samples taken thus far could be added to the entrainment database consisting of the DM1200 and LSFM data.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Analysis of Species Partitioning in the DWPF Melter

Choi

Kesterson

Johnson

et al. 2015

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The work described in this report is preliminary in nature since its goal was to demonstrate the feasibility of estimating the off-gas entrainment rates from the Defense Waste Processing Facility (DWPF) melter based on a simple mass balance using measured feed and glass pour stream compositions and timeaveraged melter operating data over the duration of one canister-filling cycle. The only case considered in this study involved the SB6 pour stream sample taken while Canister #3472 was being filled over a 20hour period on 12/20/2010, approximately three months after the bubblers were installed. The analytical results for that pour stream sample provided the necessary glass composition data for the mass balance calculations. To estimate the "matching" feed composition, which is not necessarily the same as that of the Melter Feed Tank (MFT) batch being fed at the time of pour stream sampling, a mixing model was developed involving three preceding MFT batches as well as the one being fed at that time based on the assumption of perfect mixing in the glass pool but with an induction period to account for the process delays involved in the calcination/fusion step in the cold cap and the melter turnover. Some of the key findings of this study include:  The proposed concept of estimating off-gas entrainment rates from measured feed and glass pour stream compositions appears feasible at least for the major species and thus additional case studies are warranted.  The overall entrainment rate from the bubbled DWPF melter was calculated to be 2.4% of the calcined solids fed, which is ~2X the design basis entrainment rate for the non-bubbled melter.  The average entrainment rate of the four major non-volatile sludge components, including Al, Fe, Mn and U, was calculated to be 2.7% fed, while that of the frit components, excluding Na, was 0.7%. It means that the entrainment rate of sludge is higher than that of frit by a ratio of 4:1, which is in qualitative agreement with the results of two off-gas deposit samples taken earlier.  Specifically, the calculated entrainment rates of Fe and Si were 0.6-0.7%, while those of Al, B, Mn, Th and U were higher, ranging from 1.9 to 5.6% with Mn at the highest.  The calculated entrainment rate of Na was 7.5%, of which a significant fraction could have been entrained via volatilization in the form of borates, sulfates, and halides.  The calculated entrainment rates of semi-volatile Cs and Cd ranged from 16 to 18%, while that of sulfur was estimated to be higher than 50%.  The calculated DWPF entrainment rates were in general higher than the DM1200 rates, which may be attributed in part to the formic acid used as the reductant for the DWPF feeds compared to sugar used for the DM1200 feeds, as demonstrated earlier in terms of increased pressure spikes with formic acid-based feeds. The much higher entrainment rates of Na and semi-volatiles in the DWPF melter could be reflective of actual operating conditions such as extended idling. The proposed concept will be tested further against ad...

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Analysis of DWPF Sludge Batch 6 (Macrobatch 7) Pour Stream Glass Samples

Cited by 7 publications

References 8 publications

Examination Of Sulfur Measurements In DWPF Sludge Slurry And SRAT Product Materials

Examination Of Sulfur Measurements In DWPF Sludge Slurry And SRAT Product Materials

Analysis of the Sludge Batch 7b (Macrobatch 9) DWPF Pour Stream Glass Sample

Preliminary Analysis of Species Partitioning in the DWPF Melter

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