Investigation of Thermolytic Hydrogen Generation Rate in Tank 28 and Tank 39 Samples

This report contains hydrogen generation rate (HGR) measurements of Tank 28 and Tank 39 radioactive samples with and without added glycolate as a function of temperature. The objective of the Tank 28 and Tank 39 HGR measurements is to extend the knowledge from previous sample thermolysis HGR measurements and augment simulant testing for developing models for the Savannah River Site (SRS) Concentration, Storage, and Transfer Facilities (CSTF) thermolysis HGR with and without added glycolate. Tank 28 testing is applicable to concentrated salt supernate, legacy organic compounds resulting from the F-Canyon processes and boiling in the 3H-Evaporator System. Tank 39 testing is applicable to moderately concentrated salt supernate and organic compounds in fresh waste from the H-Canyon processes. For HGR tests with added sodium glycolate, the glycolate concentrations added to Tank 28 (500 mg/L) and Tank 39 (2000 mg/L) are based on concentrations expected to result in quantifiable HGR between temperatures of 70 °C and the atmospheric pressure boiling point. The added glycolate is much higher than the expected future glycolate concentrations in Tank 28, Tank 39, and similar CSTF tanks.