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: Aurelien Bergeron Applicant's institution: ANL Applicant's division: NE Project Name: RTRC_neutronics Project title: RTRC - Neutronics and Depletion Coupling Associated funding: DOE NNSA NA-212 Other Systems: The Research and Test Reactor Conversion (RTRC) Department in NE operates several program-specific, small scale Linux clusters. There is no specific limitation in term of time and number of nodes used by each single user. However, machines must are shared in order to let every users run their jobs for the tens of active projects at any given time. Science: To study the behavior of research and test reactor in steady state and through time by coupling neutronic Monte Carlo and depletion calculations. Project description: As a part of the Global Threat Reduction Initiative (GTRI), in support of our national security efforts, the mission of the Reactor Conversion Program is to minimize, and to the extent possible, eliminate the use of Highly Enriched Uranium (HEU) fuel in civil applications converting research and test reactors to the use of Low Enriched Uranium (LEU) fuel. Typically the reactor conversion studies are divided in three main steps: 1) Study the reactor in its current, HEU fueled configuration in order to validate tools and models. 2) Study the impact of the conversion on performance and safety and; 3) If necessary, find solutions to improve reactor performance and safety. Because most of the reactors in the scope of the GTRI Reactor Conversion Program have a unique design, the conversion analyses of those machines require to develop specific tools and/or calculations schemes. To study the conversion of some High Performance Reactors (HPR), it will be necessary to study their behavior in both steady state and their evolution through time. This can be done by coupling Monte Carlo and depletion calculations. Two main calculation schemes have been elaborated at ANL: 1) A coupling of MCNP (neutronic steady state software developed by LANL) with REBUS-MCNP (depletion+communication with MCNP, developed by ANL). 2) A coupling MCNP with ORIGEN2 (depletion, developed by ORNL) and VESTA (communication MCNP-ORIGEN, developed by IRSN, France). Both calculation schemes are expected to be used intensively. Our users have received licenses to run these proprietary software. We will need to install the codes on a restricted project directory on the Fusion cluster. Our depletion codes do not require very large runtime memory. We normally use large sampling sizes in our Monte Carlo calculations to reduce communication time. Depending on the nature of the problem and the accuracy that is required, a single job can consume 50 to 1000 core-hours on the Fusion cluster. Two project members are expected for now but it is possible than a more will join the group during the year. Project URL: http://www.rertr.anl.gov Requested allocation: 80000 Q1: 20000 Q2: 20000 Q3: 20000 Q4: 20000 Justification: The requester has used undetermined amount 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