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This report outlines the work completed for a Laboratory Directed Research and Development project at Sandia National Laboratories from October 2012 through September 2015. An experimental supercritical carbon dioxide (sCO2) loop was designed, built, and operated. The experimental work demonstrated that sCO2 can be utilized as the working fluid in an air-cooled, natural circulation configuration to transfer heat from a source to the ultimate heat sink, which is the surrounding ambient environment in most cases. The loop was also operated in an induction-heated, watercooled configuration that allows for measurements of physical parameters that are difficult to isolate in the air-cooled configuration. Analysis included the development of two computational fluid dynamics models. Future work is anticipated to answer questions that were not covered in this project. UNCLASSIFIED UNLIMITED RELEASE 4 UNCLASSIFIED UNLIMITED RELEASE This page intentionally left blank. UNCLASSIFIED UNLIMITED RELEASE 5 UNCLASSIFIED UNLIMITED RELEASE

Design Construction and Operation of a Supercritical Carbon Dioxide (sCO&lt;sub&gt;2&lt;/sub&gt;) Loop for Investigation of Dry Cooling and Natural Circulation Potential for Use in Advanced Small Modular Reactors Utilizing sCO&lt;sub&gt;2&lt;/sub&gt; Power Conversion Cycles.