Omnibus User Manual

Johnson, S. R.; Evans, Thomas M.; Davidson, Gregory G.; Hamilton, Steven P.; Pandya, Tara; Royston, Katherine; Biondo, Elliott

doi:10.2172/1649625

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Two results from Shift are presented using Omnibus-Shift and SCALE-Shift. The Shift Monte Carlo code can be executed via two distinct frontends: SCALE [4] and Omnibus [9]. Currently, cell-wise few-group cross sections can be generated using the Omnibus frontend.…”

Section: Msre Model Validationmentioning

confidence: 99%

Molten Salt Reactor Experiment Simulation using Shift/Griffin

Hartanto,

Davidson,

Godfrey

et al. 2023

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The Department of Energy (DOE)'s NEAMS focuses its efforts on the development of advanced modeling and simulation (M&S) tools for light-water reactors (LWRs) and non-LWRs (i.e., molten salt reactors, high-temperature gas reactors, microreactors, and fast reactors). In the previous fiscal year, the Multiphysics Applications Driver Technical Area funded molten salt reactor (MSR) M&S at Oak Ridge National Laboratory (ORNL) to generate multigroup macroscopic cross sections with Shift for a MSRE 2D lattice model in Griffin. In addition, Shift's capability to calculate gamma dose rates from activated components in the primary exchangers in a molten salt breeder reactor was also demonstrated.

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Section: Msre Model Validationmentioning

confidence: 99%

Molten Salt Reactor Experiment Simulation using Shift/Griffin

Hartanto,

Davidson,

Godfrey

et al. 2023

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show abstract

“…1. Omnibus: Omnibus is available through SCALE and is designed to launch Shift calculations in high performance computing (HPC) environments [5]. Runtime options such as scheduler type, number of nodes, walltime, processors per node, and message passing interface (MPI) command-line arguments are specified in the Omnibus input file.…”

Section: Executable Optionsmentioning

confidence: 99%

Modeling, Performance Assessment, and Nodal Data Analysis of TRISO-Fueled Systems with Shift

Pandya¹,

Bostelmann²,

Jessee³

et al. 2022

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“…Figure 2 b) illustrates the hybrid method used in this study. There are two options in the deterministic step: the Consistent Adjoint Driven Importance Sampling (CADIS) or the Forward-Weighted consistent Adjoint Driven Importance Sampling (FW-CADIS) [4]. With CADIS, the deterministic SN code Denovo, which was developed by ORNL, calculates the adjoint flux (neutron importance) on a simplified and homogenized problem of the original model and generate the weight window for Shift to perform the main transport.…”

Section: Monte Carlo Variance Reduction Techniquesmentioning

confidence: 99%

“…Then, the NEAMS Monte Carlo code Shift, which is being developed at ORNL, was used to model the same problem. Shift is a massively parallel Monte Carlo radiation transport code [4], which made it very attractive for NEAMS to assess its potential use in dose rate and shielding calculations. ANL and ORNL worked together to set up and run the Shift code successfully on the INL HPC cluster.…”

Section: Introductionmentioning

confidence: 99%