Product Consistency Test Results for the LAW HPVR Glasses

Abstract

This report summarizes the chemical analysis of Product Consistency Test (PCT) leachates received from Pacific Northwest National Laboratory (PNNL). The leachates are from a series of simulated nuclear waste glasses designated Low-Activity Waste High PCT and VHT Response (LAW HPVR) glasses that were designed and fabricated at PNNL. The glasses included both quenched and canister centerline cooled glasses. The reported data will be used in the development, validation, and implementation of enhanced property/composition models for waste glass vitrification at Hanford.The elemental release for the study glasses is reported as normalized concentration (NCi). NCi of several elements was computed for both the target and measured glass compositions, which were similar, resulting in no significant differences when computing the NCi values. The majority of the glasses exhibited NCB, NCNa, and NCSi values that were greater than the Hanford Tank Waste Treatment Plant (WTP) low-activity waste constraint of 4 g/L. Several blank solutions included with the study glasses had K, Na, and Si concentrations above the analytical detection limit. Additionally, several of the reference glasses that were included with the study glasses had Na concentrations that were higher than expected. The unexpected analyte concentrations in the reference glass and blank solutions were insignificant with respect to the reported NCi values, and are noted for completeness and their experimental relevance. Revision vii Revision Revision 0 Table 2-1. Identifiers for the PCT Leachates