Analysis of Turbulent Mixing Jets in Large Scale Tank Page: 3 of 38
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WSRC-STI-2007-00160
sludge, but the salt has been dissolved and transferred to other tanks. The remaining sludge was
hydraulically re-suspended and transferred to other tanks.
SRS has successfully used numerous slurry pump designs from different manufacturers over the last 25
years to mix the contents of radioactive waste storage tanks [1,2,4]. One of these slurry pump designs is
the Advanced Design Mixer Pump (ADMP) built by Lawrence Pumps, Inc [2] and is schematically shown
in Fig. 1. ADMP is a 16.76-m long shaft, vertical pump, which includes a top mounted motor, a rotating
turntable, a segmented drive shaft, a centrifugal impeller, and a pipe column that surrounds the shaft and
suspends the pump inside the tank. Power is provided to the motor through slip rings to permit the pump to
rotate continuously at 1/5 to 1/4 rpm. A smaller separate motor drives the turntable. Shaft sections are
coupled together between the motor and the impeller at the bottom of the pump. Enclosing the shaft, the
column contains pressurized water to prevent diffusion of waste into the column through the lower seal and
out onto the upper tank surface through the upper seal. These mechanical seals are mounted to the drive
shaft at the top and bottom of the pump to contain the pressure in the column. Typically, several pumps are
inserted into the waste tanks through 0.57 m diameter cylindrical openings, referred to as risers, and
mounted to the rotating turntables. Once installed in a waste tank, the pumps act as mixers by drawing
nuclear waste into the pump suction and discharging a high velocity stream of liquid back into the tank.
The discharge stream, or jet, entrains waste as it expands into the tank and lifts sedimented waste, called
sludge, from the tank bottom.2
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Lee, S.; Richard Dimenna, R.; Robert Leishear, R. & David Stefanko, D. Analysis of Turbulent Mixing Jets in Large Scale Tank, article, March 28, 2007; [Aiken, South Carolina]. (https://digital.library.unt.edu/ark:/67531/metadc888134/m1/3/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.