SB10 Frit Recommendation, and Evaluations of the Glass Variability Study and Cs-137 Concentrations in Strip Effluent Based on May 2021 Projections

Abstract

The Defense Waste Processing Facility (DWPF) is currently preparing to initiate processing of Sludge Batch 10 (SB10), which is comprised of material from Tanks 11H, 13H, 15H, and 26F, Alternate Feed Stock-2 (AFS-2) and Sodium Reactor Experiment (SRE) material from H-Canyon. In support of SB10 qualification, frit development using 2020 Tank 40 blend projections and experimental work for the glass variability study were previously conducted. Frit 473 and Frit 209 were identified as candidate frits and both were included in the development of the variability study test matrix; however, a final frit recommendation was postponed until more information could be determined about the composition of SB10 after washing. In May 2021, Savannah River Remediation (SRR) reprojected SB10 based on the analytical results from the Tank 51 qualification sample that was washed in the Savannah River National Laboratory (SRNL) Shielded Cells Facility. The objectives of this task were to: Revision 0 vi

Evaluation Of Glass Density to Support the Estimation of Fissile Mass Loadings in Sludge Batch 10 Glasses

“…Frit 473 b was recommended for SO and coupled processing with SWPF based on previous assessments of SB10 projections with the DWPF Product Composition Control System (PCCS) glass property models and their associated Measurement Acceptance Region (MAR) constraints. 18,19 Savannah River Mission Completion (SRMC) subsequently pursued Wash Cycle Y to further reduce the total sulfur in the sludge batch and increase processing flexibility at DWPF. MAR assessments of the updated projections described in Sections 3.1 and 3.2 of this report confirmed the use of Frit 473 for SB10.…”

Evaluation of Glass Density to Support the Estimation of Fissile Mass Loadings in Sludge Batch 10 Glasses

“…Frit 473 b was recommended for SO and coupled processing with SWPF based on previous assessments of SB10 projections with the DWPF Product Composition Control System (PCCS) glass property models and their associated Measurement Acceptance Region (MAR) constraints. 18,19 Savannah River Mission Completion (SRMC) subsequently pursued Wash Cycle Y to further reduce the total sulfur in the sludge batch and increase processing flexibility at DWPF. In October 2022, SRMC System Planning provided an updated SB10 Tank 40H blend baseline projection based on the Tank 51 confirmation sample results.…”

Evaluation of Sludge Solids Returns Impacts on Sludge Batch 10 Flammability, Glass Quality, and Glass Processability

“…The expected compositions of glass produced during SB 10 operations are well known based on previous evaluations of projections of the calcined solids in SB 10 Tank 51 batch waste, SB 9 Tank 40 heel waste, waste streams from Salt Waste Processing Facility (SWPF) processing, and glass frit added during CPC operations. [4][5][6] Less than or equal to 20 kg of sludge solids returns will be added to Tank 51 SB 10 waste, which suggests that impact of sludge solids returns on DWPF glass composition is limited by the potential changes in the calcined solids of SB 10 Tank 40 blended waste due to the addition of these solids to SB 10 Tank 51 waste. This assessment examines multiple bounding cases where 20 kg of sludge solids returns are added as pure metals and the change in SB 10 Tank 40 blended waste calcined solids is calculated.…”

“…These Tank 40 blend compositions are within the composition region that has already been evaluated for SB 10 using the DWPF Product Composition Control System (PCCS) models and their associated Measurement Acceptance Region (MAR) constraints. 4 Thus, the addition of sludge solids to Tank 51 before the SB 10 transfer to Tank 40 will have no further impact on glass quality and processability beyond the SB 10 assessment. Note that the addition of ~1.7 kg of aluminum (as containers for the sludge return waste) is adequately captured by the 20 kg assumption made above because the sludge returns cannot reasonably be expected to contribute more than 18.3 kg of aluminum metal in ≤20 kg of sludge return waste.…”