SLUDGE BATCH 5 VARIABILITY STUDY WITH FRIT 418

Raszewski, F ; Tommy Edwards, T ; David Peeler, D

Savannah River Site (S.C.)

关键词: Sludges;    Chemical Composition;    Waste Forms;    Radioactive Waste Processing;    Materials Testing;   

DOI  :  10.2172/939426
RP-ID  :  SRNS-STI-2008-00065
RP-ID  :  DE-AC09-08SR22470
RP-ID  :  939426

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Defense Waste Processing Facility (DWPF) is preparing to initiate processing Sludge Batch 5 (SB5) in early FY 2009. In support of the upcoming processing, the Savannah River National Laboratory (SRNL) provided a recommendation to utilize Frit 418 as a transitional frit to initiate processing of SB5. This recommendation was based on the results of assessments on the compositional projections for SB5 available at that time from both the Liquid Waste Organization (LWO) and SRNL (using a model-based approach). To support qualification of the Frit 418-SB5 system, SRNL executed a variability study to assess the acceptability of the Frit 418-SB5 glasses with respect to durability and the applicability of the current durability models. Twenty one glasses were selected for the variability study based on the available SB5 projections primarily spanning a waste loading (WL) range of 25-37%. In order to account for the addition of caustic to Tank 40, which occurred in July 2008, 3 wt% Na2O was added to the original Tank 40 heel projections. The addition of the Actinide Removal Process (ARP) stream to the blend composition was also included. Two of the glasses were fabricated at 25% and 28% WL in order to challenge the homogeneity constraint of the Product Composition Control System (PCCS) for SB5 coupled operations. These twenty one glasses were fabricated and characterized using chemical composition analysis, X-ray Diffraction (XRD) and the Product Consistency Test (PCT). The results of this study indicate that Frit 418 is a viable option for sludge-only and coupled operations. The addition of ARP did not have any negative impacts on the acceptability and predictability of the variability study glasses. Based on the measured PCT response, all of the glasses were acceptable as compared to the Environmental Assessment (EA) reference glass regardless of the thermal history and were also predictable using the current PCCS model for durability. The homogeneity constraint can be ignored for SB5 for coupled operations (based on the Appendix J compositional information), as both of the glasses targeting lower WLs (SB5VS-18 and SB5VS-19) had durabilities that were acceptable with respect to the reference EA glass.