Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 9 of 9 for “"BEAVRS"”.
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Quantifying time-dependent uncertainty in the BEAVRS benchmark using time series analysis
… consistent modeling of real problems. Thus, the BEAVRS benchmark was developed to legitimize the advancements of new 3-D full-core algorithms in the field of reactor physics. However, in order to address the issue of BEAVRS uncertainty quantification (UQ) of Uranium-235 fission reaction rate …
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Neutronic analysis of selected fuel assemblies of the MIT BEAVRS benchmark using HEADE collision probability code
… models for fresh core fuel assemblies of the MIT BEAVRS benchmark are developed using the HEADE collision probability code which is a module of the OSCAR-4 code used for research reactor calculations. This research study is based on the MIT BEAVRS benchmark, which is a specification of a …
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Monte Carlo and thermal hydraulic coupling using low-order nonlinear diffusion acceleration
… dominance ratio light water reactor such as the BEAVRS model, significant correlation is present and the convergence rate was much slower. This work developed a means for analytically predicting tally convergence rates when batches are correlated. Analyses supported these findings and confirmed …
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Memory efficient indexing algorithm for physical properties in OpenMC
… calculation with 4 isotopes is completed on the BEAVRS benchmark geometry. Additionally, a temperature distribution assembly layout is presented.
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LWR fuel reactivity depletion verification using 2D full core MOC and flux map data
… to be unrealistically small. In this study, the BEAVRS benchmark is modeled with both 2D, full-core, multi-group transport calculations and 2D and 3D nodal diffusion calculations. The calculated reaction rates are compared with measured in-core detector reaction rates supplied in the benchmark. …
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Testing the EPRI reactivity depletion decrement uncertainty methods
… core model. In this thesis, two cycles of the BEAVRS PWR reactor benchmark are used to test the EPRI methodology, now including testing of not only the nodal core diffusion model, but also the perturbation technique itself. By changing the perturbation technique from assembly reactivity to …
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Full core 3D neutron transport simulation using the method of characteristics with linear sources
… results are presented for the full core BEAVRS LWR benchmark. Parameter refinement studies and comparisons with reference OpenMC Monte Carlo solutions show that converged full core 3D MOC simulations are feasible on modern supercomputers for the first time.
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Improvements and applications of the Uniform Fission Site method in Monte Carlo
… CMFD acceleration was conducted using the 3-D BEAVRS benchmark. Results showed that keeping CMFD acceleration on during active batches maintained a stationary source and reduced the variance for assembly results. The UFS method stacked on this, reducing the maximum relative uncertainties. The …
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Domain decomposition for Monte Carlo particle transport simulations of nuclear reactors
… and tested for a highly-detailed PWR benchmark: BEAVRS. The proposed domain decomposition implementation incorporates efficient algorithms for scalable inter-domain particle communication in a manner that is reproducible with any pseudo-random number seed. Algorithms are also proposed to scalably …