Three-Dimensional Full Core Power Calculations for Pressurized Water Reactors

Conference · Thu Dec 31 23:00:00 EST 2009

OSTI ID:1026719

Evans, Thomas M ^[1]; Davidson, Gregory G ^[1]; Slaybaugh, Rachel N ^[1]

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1. ORNL

We have implemented a new multilevel parallel decomposition in the Denovo discrete ordinates radiation transport code. In concert with Krylov subspace iterative solvers, the multilevel decomposition allows concurrency over energy in addition to space-angle. The original space-angle partitioning in Denovo placed an eective limit on the scalability of the transport solver that was highly dependent on the problem size. The added phase-space concurrency combined with the high-performance Krylov solvers has enabled weak scaling to 100K cores on the Jaguar XT5 supercomputer. Furthermore, the multilevel decomposition provides enough concurrency to scale to exascale computing and beyond.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1026719
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
DISCRETE ORDINATE METHOD
PHASE SPACE
PWR TYPE REACTORS
RADIATION TRANSPORT