Tank characterization report for Single-Shell Tank 241-BX-107

Raphael, G.F.

doi:10.2172/10104829

Cited by 1 publication

(2 citation statements)

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“…The rheology of Hanford wastes has been measured to support the design of waste slurry handling systems (e.g., pumps and mixers). ,− Results have been summarized by Wells et al , and Meacham et al The rheology of the liquid and supernate fractions is Newtonian, as the soluble species are typically limited to simple sodium salts (such as sodium hydroxide, phosphate, nitrate, nitrite, carbonate, and sulfate). However, given the high degree of saturation, small perturbations could promote precipitation and a more complex rheology.…”

Section: Emergent Physical and Chemical Properties Of Hanford Tank Wastementioning

confidence: 99%

“…Knowledge of the PSD of both insoluble and soluble Hanford waste solids is needed to support design of systems that retrieve, transport, mix, and treat these wastes. Particle size measurements have been performed on numerous core and auger samples taken from the Hanford tanks as part of waste characterization, retrieval, safety, and pretreatment projects. ,,,,− ,,,,,,,,− Despite the large body of work on waste PSD, not all tanks have been characterized, and many existing measurements are outdated due to transfers into tanks and/or chemical aging of the tank constituents. Furthermore, Hanford PSD measurements lack coherency due to the use of variable methodologies applied under different conditions.…”

Section: Representative Waste Particle Size Distributionmentioning

confidence: 99%

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Review of the Scientific Understanding of Radioactive Waste at the U.S. DOE Hanford Site

Peterson¹,

Buck²,

Chun³

et al. 2018

Environ. Sci. Technol.

150

153

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This Critical Review reviews the origin and chemical and rheological complexity of radioactive waste at the U.S. Department of Energy Hanford Site. The waste, stored in underground tanks, was generated via three distinct processes over decades of plutonium extraction operations. Although close records were kept of original waste disposition, tank-to-tank transfers and conditions that impede equilibrium complicate our understanding of the chemistry, phase composition, and rheology of the waste. Tank waste slurries comprise particles and aggregates from nano to micro scales, with varying densities, morphologies, heterogeneous compositions, and complicated responses to flow regimes and process conditions. Further, remnant or changing radiation fields may affect the stability and rheology of the waste. These conditions pose challenges for transport through conduits or pipes to treatment plants for vitrification. Additionally, recalcitrant boehmite degrades glass quality and the high aluminum content must be reduced prior to vitrification for the manufacture of waste glass of acceptable durability. However, caustic leaching indicates that boehmite dissolves much more slowly than predicted given surface normalized rates. Existing empirical models based on ex situ experiments and observations generally only describe material balances and have not effectively predicted process performance. Recent advances in the areas of in situ microscopy, aberration-corrected transmission electron microscopy, theoretical modeling across scales, and experimental methods for probing the physics and chemistry at mineral-fluid and mineral-mineral interfaces are being implemented to build robustly predictive physics-based models.

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