Hello, A new project on the LCRC cluster has been requested. Please forward the information on to the LCRC Allocation sub-committee. Applicant's name: Justin W Thomas Applicant's institution: ANL Applicant's division: NE Project Name: NEAMS_Safety Project title: CFD Support for Sodium-cooled Fast Reactor Safety Associated funding: DOE-NE Other Systems: Science: Enchance the thermofluid modeling capability of Argonne's liquid-metal fast reactor safety code SAS4A/SASSYS-1 by coupling with the commercial CFD code STAR-CCM+ for problems that involve multidimensional flows, thermal stratification, and natural circulation. This will improve the accuracy of safety-related calculations to support fast reactor design, without requiring significant development work in the SAS4A/SASSYS-1 systems code. Project description: The SAS4A/SASSYS-1 code was developed at Argonne to support fast reactor design. It is used to analyze posited accident scenarios in the fast reactor system, and determine whether or not the reactor system maintains its integrity. This requires the analysis of a nonlinear system (the reactor system itself) and several fields of physics, including reactor physics, thermal-hydraulics, and structural mechanics. For the thermofluid part, SAS4A/SASSYS-1 relies primarily on 1-D and even 0-D models of components in the coolant system. For some scenarios, the accuracy of these calculations could be significantly improved by applying CFD to specific regions of interest, while still using SAS4A/SASSYS-1 to model the majority of the plant. The coupling of STAR-CCM+ and SAS4A/SASSYS-1 has already been demonstrated on a test model, the results of which are being published at the upcoming Winter Meeting of the American Nuclear Society. The scenario under consideration in this case was a loss-of-flow where the primary pumps were shut off, and thermal stratification occurs in the plenum above the reactor core. STAR-CCM+ was applied only to this plenum, modeling natural circulation and thermal stratification. This model was run on only 4 cores for about 40 hours, but production models would typically require 16-32 cores. Project URL: Requested allocation: 20000 Justification: The requester has used 0 hours of their initial startup project. In addition to approving an initial amount, please specify a Category and Subcategory for this project. For a list of the current selection of approved categories, please see: https://wiki.lcrc.anl.gov/wiki/Processes/Categories Once the Allocation committee has approved the project, please go to the Project Management page to create it: https://accounts.lcrc.anl.gov/projects.php Thank You, The LCRC Accounts System