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possible chemical interaction mechanism(s), e.g., breakdown of the passivating chromium (Cr) oxide or carburization, at temperatures and pressures of interest. Report Content and Organization This final report highlights key accomplishments from this project. Section 1 provides introductory information about the project. Detailed information about the objectives and accomplishments may be found in Sections 2 through 4. Section 5 highlights results and conclusions that can be drawn from results obtained from each task. This executive summary is provided to highlight accomplishments from this research project. Key Program Accomplishments Key accomplishments from this three year program are highlighted in this section. This project consisted of threes- tasks for the VHTR. These tasks are to: 1) develop a S-CO2 Brayton cycle, 2) improve VHTR cycle efficiency, and 3) test candidate materials for corrosion and creep resistance. The primary activities and key accomplishments for each task are summarized below. Note that these accomplishments include items required to meet task objectives outlined in the original proposal for this project and items that meet overall NERI objectives. As indicated below, this project not only advanced the state-of-art in research pertaining to the VHTR, but also helped prepare graduate students to join the nuclear engineering workforce. Advanced gas reactor technology has been identified as one of the best passively safe, thermally efficient, proliferation resistant, modular reactor systems capable of electricity and hydrogen production as well as efficient burning of spent fuel. Internationally, the VHTR concept has become the top priority for implementation because of its inherent safety and near-term implementation feasibility. The U.S. Department of Energy (DOE) indicates that the Next Generation Nuclear Plant (NGNP), VHTR, will be built at the INL site by 2017. In order to resolve any first of a kind technical issue, this project consists of three major tasks with a number of subtasks under the major ones. All tasks have been performed on schedule and budget. The technical accomplishments from each task are summarized below: Development of S-CO2 Brayton Cycle: The S-CO2 Brayton cycle deals with high pressures and temperatures. At these conditions, an ideal gas law, using isentropic compression and expansion cannot be applied because of real gas effects associated with non-ideal compression and expansion processes. Therefore, there was a need to develop analytical equations for polytropic expansion and compression through a sequence of turbines and compressors, respectively. The developed set of equations is used for scoping analyses aimed at investigating the effect of the overall plant efficiency. For the detailed computation of the balance of plant (BOP) efficiency calculations, a CO2 database is required to make accurate calculations. We compared a number of equations of state and CO2 databases and determined that the NIST CO2 database is the most accurate and the properties are consistent with those referenced in Perry’s Handbook. In order to compare the plant efficiency depending on the power conversion configuration, the initial reference design is depicted in Figure ES-1. ivPDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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