Assessment of the Ability of Standard Slurry Pumps to Mix Solids With Liquids in Tank 50h

Assessment of performing an MST strike in Tank 21H

“…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…”

“…Another approach to assessing the ability of three standard slurry pumps to suspend MST in Tank 21 is to look at the operating experience of standard slurry pumps in Tank 50. 5 Engineering Calculation J-CLC-H-00793 determined the size and location of the mounds observed in Tank 50H in 2003. 8 Standard slurry pumps were located in risers E1 and B2.…”

“…9 Previous SRNL work found the cleaning radius of a slurry pump to be inversely proportional to the square root of the slurry yield stress. 10,11 Previous PNNL work found the cleaning radius to vary with slurry shear strength according to equation [5] ECR  D j U j  s -0.46 [5] where  s is the sludge shear strength. 12 Assuming the shear strength of the solid mounds in Tank 50 was 400 Pa, the cleaning radius was 30 feet, and the target cleaning radius in Tank 21 is 45.3 feet, the shear strength of any solid particles or mounds must be less than 160 Pa if the standard slurry pumps are to be able to suspend the sludge throughout the vessel.…”

“…The procedural controls and requirements applicable to the quality of the data were identified in the TTQAP for this task (SRNL-RP-2014-00433). 5 The non-qualified data used in this task are contained in references 1, 2, 6, 7, and 13. The TTQAPs for these tasks (SRNL-RP-2010-00081, SRNL-RP-2010-00686, SRNL-RP-2011-01114) were reviewed to determine the procedural controls and quality requirements of the testing performed to obtain the data.…”