This report provides the results of analyses on Tanks 38H and 43H surface and subsurface supernatant liquid samples in support of the Enrichment Control Program (ECP) and the Corrosion Control Program (CCP). The U-235 mass divided by the total uranium mass averaged 6.13E-03 7.05E-05 (6.13E-01 7.05E-03 % uranium enrichment) for all sample measurements in both types of tank samples. The average U-235 concentration in Tank 38H samples ranged from 6.75E-01 to 6.83E-01 mg/L, while the average U-238

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... oncentration in the Tank 38H samples ranged from 1.11E+02 to 1.12E+02 mg/L. In contrast, the average U-235 concentration in the Tank 43H samples ranged from 4.23E-01 to 4.35E-01 mg/L and the average U-238 concentration in the Tank 43H samples ranged from 6.81E+01 to 6.97E+01 mg/L. Thus, the U-235/total uranium ratio is in line with the prior 2H-evaporator ECP samples. The measured sodium concentration averaged, respectively, 7.17 M and 7.19 M in the Tank 38H surface sample and the Tank 38H subsurface sample. The measured sodium concentration in the Tank 43H surface sample and the Tank 43 subsurface sample averaged, respectively, 4.46 and 4.35 M. In general, the nitrate, nitrite, free-OH and specific gravity of the Tank 43H samples were lower in magnitude than those of the Tank 38H samples.