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An investigation of the oscillating and unstable cycle behavior calculated by the ANL Plant Dynamics Code under specific conditions has been carried out. The results of the investigation indicate that the calculated oscillations during transients involving reduction in power to 0 % nominal may be numerical artifacts attributed to the modeling of the main compressor. In particular, the most probable reason for such instabilities is the limit of applicability of the currently used one-dimensional compressor performance subroutines which are based on empirical loss coefficients. Development of more detailed compressor design and performance models is required and is recommended for future work in order to better investigate and potentially eliminate the calculated instabilities. Also, as part of the development of improved compressor modeling, more reliable surge criteria should be developed for S-CO2 compressor operation close to the critical point. The development of more detailed compressor models is expected to be carried out as part of validation of the Plant Dynamics Code through model comparison with the experiment data generated in the small S-CO2 loops being constructed at Barber-Nichols Inc. and Sandia National Laboratories (SNL). Although such a comparison activity had been planned to be initiated in FY 2008, data from the SNL compression loop currently in operation at Barber Nichols Inc. will not become available until FY 2009. Acknowledgements Argonne National Laboratory’s work was supported by the U. S. Department of Energy Generation IV Nuclear Energy Systems Initiative under the Work Package, G- AN08VH0301, Energy Conversion – Brayton Cycle Control Analysis. The SAS4A/SASSYS-1 scram calculations were carried out by Dr. Constantine P. Tzanos (ANL/NE). The authors are grateful to Dr. Paul S. Pickard of Sandia National Laboratories, the Generation IV National Technical Director for Energy Conversion, Dr. Rob M. Versluis, the U.S. DOE Generation IV Program Manager, and Dr. Carl Sink, the U.S. DOE Program Manager for Energy Conversion. The authors are also indebted to Dr. Jim Cahalan (ANL/NE), the ANL Work Package Manager for the project. 41PDF Image | Supercritical Carbon Dioxide Cycle Control Analysis
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