Hello, A yearly allocation for the LCRC cluster has been requested with the following updated information: Submitter/PI: Rui Hu Project Name: SHARP-IF Division: NE Project title: SHARP – Intermediate Fidelity Modeling Associated funding: DOE-Nuclear Energy, DOE-NNSA Other Systems: Science: An intermediate fidelity (IF) thermal-hydraulics modeling method is being pursued under NEAMS Reactor Product Line (SHARP) for a fast-running, modest-fidelity, whole-core transient analyses capability. The approach is essential for design scoping and engineering analyses and could lead to improvements in the design of the new generations of reactors and to the reduction of uncertainties in safety analysis. The IF method relies on RANS based turbulence modeling approach and advanced system modeling methods to represent the fluid flow and heat transfer physics. Project description: The system analysis code and the RANS-based commercial CFD code STAR-CCM+ are incorporated into the SHARP framework for a multi-scale analysis of Sodium Fast Reactors. In the previous fiscal year, the feasibility of performing coupled System code and STAR-CCM+ simulations of protected loss-of-flow accident was demonstrated. In that effort, the outlet plenum was modeled by STAR-CCM+ and the rest of the primary coolant system and the secondary system were simulated by the SFR Module, and the flow and temperature conditions at the interface were exchanged between the two codes as boundary conditions. In the planned activities for FY14, this coupling exercise will be extended to model both the cold pool and the upper plenum of the SFR in the CFD model since multi-dimensional effects and the thermal stratification in the cold pool are also important to the transient behavior of the system. Accurate predictions of flow and temperature are essential to assure the reactor safety during postulated accidents. Furthermore, the CFD code STAR-CCM+ will be used for design evaluations of reactor systems and experimental facilities. Notably, an advanced sodium fast reactor design concept; and the cross-shape twisted fuel assembly design in a conversion effort from using HEU to LEU, and the natural convection shutdown test facility that is currently being built at Argonne. This type of simulations is essential to assure the safety of the proposed design. Also, the pre-test simulation results of the NSTF will be compared against to the experimental results as a validation study of the CFD code. At Argonne, the CFD code STAR-CCM+ are routinely applied to simulations that use more than 100 cores, and good parallel performance has been observed. As problem size increases, i.e. for finer meshes and for large pin bundles, larger numbers of cores would be utilized and based on data from the developers good parallel performance will continue to be expected. On the other hand, the system code, the SFR Module based on MOOSE and RELAP-7 is a new development. The parallelization will be provided by the underlying MOOSE framework which is built on PETSc. The scalability of MOOSE has been demonstrated by other MOOSE-based applications. The system code usually relies on coarse representation of the system thus does not require significant amount of computing resources. Project URL: Current FY Hours Used: undetermined amount New FY Requested allocation: 340000 Q1: 60000 Q2: 60000 Q3: 100000 Q4: 120000 Justification: Thank You, The LCRC Accounts System