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Three-Dimensional Thermal Modeling Analysis of CST Media for the Small Column Ion Exchange Project

机译：小柱离子交换工程CsT介质的三维热模拟分析

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Models have been developed to simulate the thermal characteristics of Crystalline Silicotitanate (CST) ion exchange media fully loaded with radioactive cesium packed in a column configuration or distributed on the floor of a waste storage tank. This work was conducted to support the Small Column Ion Exchange (SCIX) program which is focused on processing dissolved, high-sodium salt waste for the removal of specific radionuclides such as Cs-137 within a High Level Waste (HLW) storage tank at the Savannah River Site (SRS). The column modeling domain and the scope of the calculations in this work have been broadened relative to previous calculations to include vertical temperature distributions within the packed bed of ion exchange media as well as the upper column plenum region containing only fluid. Thermal modeling calculations were also performed for the entire waste storage tank domain for the case where spent and ground CST has been transferred to the waste tank. The in-column and in-tank evaluations incorporated recently updated maximum cesium loading levels calculated using the current SCIX feed compositions, which resulted in significantly higher cesium loading than previously calculated (489 Ci/liter nominal and 600 Ci/L bounding loadings). The calculations were conducted to ensure conservative predictions for the maximum temperatures achievable using the current baseline design. However, the degree of conservatism was reduced relative to the previous two-dimensional calculations by using a three-dimensional modeling approach with the selection of parameters which were nearer to expected conditions. The primary goals of the extended thermal modeling effort were to determine whether bulk fluid boiling or superheating are possible within the column module under accident conditions and to determine the maximum floor temperatures within the tank loaded with spent CST. Accident scenarios evaluated for the column modeling calculations included loss of salt solution flow through the bed and loss of active cooling.

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