Tank characterization report for single-shell tank 241-C-103

Abstract

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Potential for criticality in Hanford tanks resulting from retrieval of tank waste

“…In settling tests of solids from Tank SY-102 (Winters 1995) and C-1079,(a) the supernate above the settling slurry is relatively clear. The maximum rate at which the supernate/slurry interface moves downward provides an indication of the settling velocities of &e smallest particles, or smallest flocs within the slurry.…”

“…The unhindered settling velocity for a sphere in a viscous liquid is given by Stokes' law: where v = particle settling velocity, m/s R = particle radius, m g = gravitational acceleration, 9.8 m/s2 p = fluid viscosity, Pa-sec Ap = density difference between particle and fluid, kg/m3 (3.7). Winters (1995) reports the maximum settling velocity for a 2:l dilution of SY-102 solids with water was 0.42 cm/h. Assuming an effective settling particle density of roughly 2500 kg/m3 [2.5 g/cm3], (Ap = 1500 kg/m3), and a fluid viscosity of 1.1 CP (based on supernate salt concentration measurements provided by Winters), the particle diameter corresponding to a settling velocity of 0.42 cm/h is about 1.3 microns.…”