MPACT Performance Improvements in VERA-CS

Technical Report · Thu Jun 30 00:00:00 EDT 2016

DOI:https://doi.org/10.2172/3004259· OSTI ID:3004259

Kochunas, Brendan ^[1]; Stimpson, Shane G ^[2]; Liu, Yuxuan ^[1]; Yee, Ben ^[1]; Zhu, Ang ^[1]; Fitzgerald, Andrew ^[1]; Graham, Aaron ^[1]; Jarrett, Mike ^[1]; Collins, Benjamin ^[2]; Kim, Kang Seog ^[2]; Clarno, Kevin ^[2]

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1. Univ. of Michigan, Ann Arbor, MI (United States)
2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

The report summarizes the initial profile of MPACT representative of the version that was distributed with VERA 3.4. It then describes several activities recently performed to increase the overall performance of the code. For the various improvements described in this report, several have been well known to the development team and reactor physics methods community for some time; while others proved novel in their combination of other existing ideas. Still, other improvements were the result of unanticipated breakthroughs in numerical methods research. These performance improvement activities focused on the following components of MPACT. Method of Characteristics Transport Kernel Iterative Methods for Coarse Mesh Finite Difference Linear System Macroscopic Cross Section and Effective Fission Spectrum Calculation Resonance self-shielding (Subgroup) calculation A summary of the overall improvement from this work as tested on a few representative problems is provided in the table below. The incremental improvements for various changes are shown in the figure below.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 3004259
• Report Number(s): CASL-U--2016-1115-000
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
97 MATHEMATICS AND COMPUTING