Single-pass flow-through test elucidation of weathering behavior and evaluation of contaminant release models for Hanford tank residual radioactive waste

Conversion of Coarse Gibbsite Remaining in Hanford Nuclear Waste Tank Heels to Solid Sodium Aluminate [NaAl(OH)4·1.5H2O]

“…Any waste left in the tanks at the completion of retrieval is expected to be in the closed tanks and becomes part of the source term to the environment. Ongoing work is evaluating the environmental risk of leaving a small waste heel in the tanks after closure. − Nonetheless, as much waste as possible will be removed from the tanks prior to closure. Similar problems with coarse gibbsite have been encountered in retrieved waste tanks at other nuclear waste sites .…”