Infrared Spectral Study of Thiazolidine-2-thione & Its Metal Complexes

170-17

Normal Vibrations & Donor Characteristics of Thiazoline-2-thione: Complexes with Cu(II), Cd(II), Ni(II) & Hg(II)

925-92

Project W-320 thermal hydraulic model benchmarking and baselining

Project W-320 will be retrieving waste from Tank 241-C-106 and transferring the waste to Tank 241-AY-102. Waste in both tanks must be maintained below applicable thermal limits during and following the waste transfer. Thermal hydraulic process control models will be used for process control of the thermal limits. This report documents the process control models and presents a benchmarking of the models with data from Tanks 241-C-106 and 241-AY-102. Revision 1 of this report will provide a baselining of the models in preparation for the initiation of sluicing

Evaluation of potential and consequences of steam bump in high heat waste tanks and assessment and validation of GOTH computer code

This report describes the thermal hydraulic analysis performed using the GOTH computer code to evaluate the potential and consequences of steam bumps in high heat waste tanks. The analysis was performed for three different sludge volumes that correspond to the current sludge volume in tank AZ-101, combined sludge volumes of tank AZ-101 and tank AZ-102 and the projected consolidated sludge volume of tank C-106 and tank AY-102. For each case, the steam bump potential was evaluated starting the simulation with a realistic best estimate initial temperature distribution as well as with a conservative potentially possible axial temperature distribution in the sludge. To include further conservatism in estimating the consequent release of radioactive material, steam bump analyses were also performed suppressing steam condensation with subcooled liquid in waste. In addition,calculations were performed with in leakage flow paths corresponding to open risers and pump and sluice pit cover blocks as well as with normal in leakage flow paths due to drain pipes and infiltration paths. Therefore, the report presents the steam bump evaluations encompassing from an extremely conservative case of initiating a steam bump with local saturation temperature throughout the sludge with condensation suppressed and open risers to a realistic potential case with loss of cooling of initiating at steam bump with only the bottom layer with local saturation temperature with condensation included considering only the normal in leakage flow paths. The results show that in all cases the consequences from an energetic bump may not be acceptable, and the safe operation should include keeping peak sludge temperatures below local saturation values. The report also includes a brief description of the capability and validation of models used in the GOTH computer code

Project W-320 SAR and process control thermal analyses

This report summarizes the results of thermal hydraulic computer modeling supporting Project W-320 for process control and SAR documentation. Parametric analyses were performed for the maximum steady state waste temperature. The parameters included heat load distribution, tank heat load, fluffing factor and thermal conductivity. Uncertainties in the fluffing factor and heat load distribution had the largest effect on maximum waste temperature. Safety analyses were performed for off normal events including loss of ventilation, loss of evaporation and loss of secondary chiller. The loss of both the primary and secondary ventilation was found to be the most limiting event with saturation temperature in the bottom waste reaching in just over 30 days. An evaluation was performed for the potential lowering of the supernatant level in tank 241-AY-102. The evaluation included a loss of ventilation and steam bump analysis. The reduced supernatant level decreased the time to reach saturation temperature in the waste for the loss of ventilation by about one week. However, the consequence of a steam bump were dramatically reduced

Evaluation of waste temperatures in AWF tanks for bypass mode operation of the 702-AZ ventilation system, Project W-030

This report describes the results of thermal hydraulic analysis performed to provide data in support of Project W-030 to startup new 702-AZ Primary Ventilation System. During the startup of W-030 system, the ventilation system will be operating in bypass mode. In bypass made of operation, the system is capable of supplying 1000 cfm total flow for all four AWF doubleshell tanks. The design of the W-030 system is based on the assumption that both the recirculation loop of the primary ventilation system and the secondary ventilation which provides cooling would be operating. However, during the startup neither the recirculation system nor the secondary ventilation system will be operating. A minimum flow of 100 cfm is required to prevent any flammable gas associated risk. The remaining 600 cfm flow can be divided among the four tanks as necessary to keep the peak sludge temperatures below the operating temperature limit. For the purpose of determining the minimum flow required for cooling each tank, the thermal hydraulic analysis is performed to predict the peak sludge temperatures in AY/AZ tanks under different ventilation flows. The heat load for AZ farm tanks is taken from characterization reports and for the AY farm tanks, the heat load was estimated by thermal analysis using the measured waste temperatures and the waste liquid evaporation rates. The tank 241-AZ-101 and the tank 241-AZ-102 have heat loads of 241,600 and 199,500 Btu/hr respectively. The tank 241-AY-101 and tank 241-AY-102 have heat loads of 41,000 and 33,000 Btu/hr respectively. Using the ambient meteorological conditions of temperature and relative humidity for the air and tank, some soil surface and the sludge levels reported in recent documents, the peak sludge and supernatant temperatures were predicted for various primary ventilation flows ranging from 100 to 400 cfm for AZ tanks and 100 and 150 cfm for AY tanks. The results of these thermal hydraulic analyses are presented. Based on the results, it is concluded that with the W-030 operating in bypass mode of operation, the waste peak temperatures can be kept below the operating limit

Thermal hydraulic evaluation of consolidating tank C-106 waste into tank AY-102

This report describes the thermal hydraulic analysis performed to provide a technical basis in support of consolidation of tank C-106 waste into tank AY-102. Several parametric calculations were performed using the HUB and GOTH computer codes. First, the current heat load of tank AY-102 was determined. Potential quantities of waste transfer from tank C-106 were established to maintain the peak temperatures of consolidated sludge in tank AY-102 to remain within Operating Specification limits. For this purpose, it was shown that active cooling of the tank floor was essential and a secondary ventilation flow of 2,000 cfm should be maintained. Transient calculations were also conducted to evaluate the effects of ambient meteorological cyclic conditions on sludge peak temperature, and loss of ventilation systems. Detailed calculations were also performed to estimate the insulating concrete air channels cooling effectiveness and the resulting peak temperatures for the consolidated sludge in tank AY-102. Calculations are were also performed for a primary and secondary ventilation systems outage, both individually and combined to establish limits on outage duration. Because of its active cooling mode of operation, the secondary ventilation system limits the outage duration