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• Power requirements for sodium pumps; • Possibility to use Printed Circuit Heat ExchangerTM (PCHETM) technology for intermediate sodium-to-CO2 heat exchangers (only straight tube HXs have previously been supported for In-Reactor Heat Exchangers (IRHXs) in the Plant Dynamics Code so far). In addition to the steady state code, the corresponding modifications were made to the dynamic calculation initialization subroutine. The subroutine calculates the volumes and masses required for the dynamic calculations. The subroutine can now calculate the volumes and masses for SFR primary and intermediate circuits. Also, the performance maps are calculated as part of the dynamic initialization. So far, only synchronous maps have been recalculated for the ABTR S-CO2 cycle turbine and compressors. The modifications of the dynamic subroutines for SFRs have been started but have not yet been completed. The modification of the dynamic subroutines is completed up to the point where the equations can be solved for steady state operation of the entire plant. To carry out the actual transient calculations, development of a sodium pump model along with the corresponding control system still needs to be carried out for the Plant Dynamics Code. In addition, the reactivity feedback and reactor power control models have to be modified for SFRs. The SFR Plant Dynamics Code has been tested for steady state operation; i.e., when the time dependent equations are solved, but no transient initiating event is introduced. No significant deviation from steady state values is observed during a 4,000 second run at full power nominal operating conditions. 2.4. PCHE Model As a part of the PCHE experiment work at ANL, the PCHE thermal hydraulic model is being developed at ANL. The model is currently being updated to improve the heat transfer and pressure drop predictions based on the recent data obtained at ANL during the PCHE S-CO2-to-S-CO2 heat exchanger experiment work. Once the model update is complete, the PCHE model will be presented in the coming Generation IV reports and/or conference or journal papers. 21PDF Image | Supercritical Carbon Dioxide Cycle Control Analysis
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