Directional Effects in Transitional Resonance Spectra and Group Constants

Hill, R. N.; Ott, K.O.; Rhodes, Joel

doi:10.13182/nse89-a23657

Cited by 4 publications

(1 citation statement)

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“…The angular dependency of resonance multigroup cross sections [29] may become more significant as the number of energy groups is reduced. This means that even though the multigroup cross sections tallied from the reference code are used, its multigroup flux solutions may not be reproduced in other deterministic codes unless the angular dependency of cross sections of the reference solution is preserved.…”

Section: Flux Correction Factorsmentioning

confidence: 99%

FY18 Progress on Improvements and V&V of MC<sup>2</sup>-3 and PROTEUS

Lee

Jung

2018

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The PROTEUS code is a high-fidelity capable deterministic neutron transport code based on unstructured finite element meshes, which solves the steady-state and transient neutron transport problem using the 2 nd -order discrete ordinate method (SN2ND), the method of characteristics (MOC), and the advanced nodal transport method (NODAL). The PROTEUS system in a broader sense consists of cross section generation tools, mesh generation tools, and output post processing tools as well as neutron transport solvers.The main accomplishments in the FY18 NEAMS neutronics tasks are that the computational performance and the simplified thermal feedback of PROTEUS-MOC were significantly improved, that the transient simulation capability as well as the molten salt reactor (MSR) simulation capabilities were successfully implemented to PROTEUS-NODAL, that the MC 2 -3 versions with the updated thermal cross section capability and threedimensional MOC capability were integrated, and that further verification and validation tests were performed with the updated PROTEUS demonstrating the applicability and accuracy of the code.The computational performance of PROTEUS-MOC was upgraded by implementing the partial-current based coarse mesh finite difference (CMFD) option, the conventional transport sweeping option, and the preconditioner to the steady-state CMFD solution scheme. In addition, the multigroup CMFD option was added to the transient solution scheme, showing significant improvements in the computational performance.

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Section: Flux Correction Factorsmentioning

confidence: 99%