Pilot-Scale Testing of the Suspension of Mst, Cst, and Simulated Sludge Slurries in a Sludge Tank

Assessment of performing an MST strike in Tank 21H

“…This requirement was compared with previous pilot-scale MST suspension data collected for SCIX that determined the cleaning radius, or zone of influence, as a function of pump operating parameters. 1,2,3 The author also reviewed a previous Tank 50 mixing analysis that examined the ability of standard slurry pumps to suspend sludge particles. 5…”

“…Previous Savannah River National Laboratory (SRNL) tank mixing studies performed for the Small Column Ion Exchange (SCIX) project have shown that 3 Submersible Mixer Pumps (SMPs) installed in Tank 41 are sufficient to support actinide removal by MST sorption as well as subsequent resuspension and removal of settled solids. 1,2,3 Savannah River Remediation (SRR) is pursuing MST addition into Tank 21 as part of the Large Tank Strike (LTS) project. The preliminary scope for LTS involves the use of three standard slurry pumps (installed in N, SE, and SW risers) in a Type IV tank.…”

“…Due to the differences in tank size, internal interferences, and pump design, a separate mixing evaluation is required to determine if the proposed configuration will allow for MST suspension and strontium and actinide sorption. 4 SRR requested SRNL to perform a technical review of previous tank mixing studies 1,2,3 to determine the effectiveness of the proposed strategy for a Large Tank Strike in Tank 21. If a three standard slurry pump configuration is shown to be inadequate or marginal, the analysis will consider strategies of four standard slurry pumps (NE, NW, SE, and SW risers) or an SMP located in the North Riser with standard slurry pumps in the SE and SW risers.…”