Abstract
Recent efforts have focused on improving the performance of the 2D/1D subplane implementation in MPACT. One of the developments recently added, presented here, focuses on treating spacer grids using a subgrid approach within each subplane, avoiding the extra computation and potentially improving stability issues that can be present by explicitly modeling the spacer grid with a separate MOC plane. From the cases analyzed, it seems that the approach does a sufficient job of maintaining the accuracy of explicitly meshing the spacer grid (<10 pcm and <1% max pin power error) while offering relatively modest performance gains. Overall, the success of the approach with spacer grids opens up possibilities to apply similar approaches to other structural components, particularly those in the axial reflectors to reduce the number of MOC planes and overall computational burden.
| Original language | English |
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| Title of host publication | International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019 |
| Publisher | American Nuclear Society |
| Pages | 2826-2835 |
| Number of pages | 10 |
| ISBN (Electronic) | 9780894487699 |
| State | Published - 2019 |
| Event | 2019 International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019 - Portland, United States Duration: Aug 25 2019 → Aug 29 2019 |
Publication series
| Name | International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019 |
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Conference
| Conference | 2019 International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019 |
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| Country/Territory | United States |
| City | Portland |
| Period | 08/25/19 → 08/29/19 |
Funding
This work was supported by the Consortium for Advanced Simulation of Light Water Reactors (http://www.casl.gov), an energy innovation hub (http://www.energy.gov/hubs) for modeling and simulation of nuclear reactors under US Department of Energy Contract No. DE-AC05-00OR22725. Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). This research made use of the resources of the Compute and Data Environment for Science (CADES) at ORNL, which is supported in part by the Office of Nuclear Energy of the US Department of Energy under Contract No. DE-AC05-00OR22725. This work was supported by the Consortium for Advanced Simulation of Light Water Reactors (http://www.casl.gov), an energy innovation hub (http://www.energy.gov/hubs) for modeling and simulation of nuclear reactors under US Department of Energy Contract No. DE-AC05-00OR22725. This research made use of the resources of the Compute and Data Environment for Science (CADES) at ORNL, which is supported in part by the Office of Nuclear Energy of the US Department of Energy under Contract No. DE-AC05-00OR22725.
Keywords
- 2D/1D
- MOC
- MPACT
- Spacer grid