Further validation of the Hanford Waste Vitrification Plant (HWVP) feed simulants will be performed by analyzing offgases during crucible melting of actual waste glasses and simulants. The existing method of vitrifying radioactive laboratory-scale samples will be modified to allow offgas analysis during preparation of glass for product testing. The analysis equipment will include two gas chromatographs (GC) with thermal conductivity detectors (TCD) and one NO/NOx analyzer. This equipment is part of the radioactive formating offgas system. The system will provide real-time analysis of H2, 02, N2, NO, N20, NO,, CO, CO2, H20, and SO2. As with the prior melting method, the product glass will be compatible with durability testing, i.e., Product Consistency Test (PCT) and Material CharacterizationCenter (MCC-1), and crystallinity analysis. Procedures have been included to ensure glass homogeneity and quenching. The radioactive glass will be adaptable to Fe.a/_Fe measurement procedures because the atmosphere above the melt can be controlled. The 325 A-hot cell facility is being established as the permanent location for radioactive offgas analysis during formating, and can be easily adapted to crucible melt tests. The total costs necessary to set up and perform offgas measurements on the first radioactive core sample is estimated at $115K. Costs for repeating the test on each additional core sample are estimated to be $60K. The schedule allows for performing the test on the next available core sample. JustificationThe source of most design/design verification data for HWVP is from laboratory, bench, and pilot-scale tests using simulated waste feeds. A critical complement to these data are corresponding radioactive data, which provides a comparison between the simulant and actual feeds. The simulant preparation methods developed by HWVP must produce simulants representative of the actual waste or they are invalid for plant design.
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