INL’s high-performance computing center provides general use scientific computing capabilities to support the lab’s efforts in advanced modeling and simulation. The center supports a wide range of research activities, including performance of materials in harsh environments (including the effects of irradiation and high temperatures), modeling of geomechanical changes in subsurface flow, performance of advanced gas-cooled nuclear reactors, and multiscale analysis of nuclear fuel performance. The center features Fission and Icestorm. Fission is an Appro distributed memory system with 12,512 processors, 25 TBytes of memory, and an aggregate peak processing rate of more than 90 Tflops. Icestorm a SGI Altix system with 2048 processors, 4 TBytes of memory, and an aggregate peak processing rate of more than 20 Tflops.