Abstract
The continuous energy coarse mesh transport (COMET) method is a hybrid stochasticdeterministic solver that provides transport solutions to heterogeneous reactor cores. In this paper, COMET is tested against continuous energy Monte Carlo in solving the recently developed stylized Small Modular Advanced High-Temperature Reactor (SmAHTR) Benchmark Problems based on the Oak Ridge National Laboratory pre-conceptual design (core configurations). These problems are well-suited to test the performance of advanced neutronics tools because of their unique neutronics characteristics such as the multiple heterogeneities. The COMET solutions for the three benchmark problems were found to agree very well with the continuous energy Monte Carlo reference solutions. The discrepancy in the core eigenvalue (k-eff) varied from 40 pcm to 51 pcm. The average and maximum relative differences in the pin fission densities were in the range of 0.20% to 0.21% and 0.77% to 0.94%, respectively. It was also found that COMET was more than 2,000 times fast than MCNP. It can be concluded that COMET can model the SmAHTR core configuration with high fidelity and significantly high computational efficiency.
Highlights
The coarse mesh transport code COMET [1,2,3] is a hybrid stochastic-deterministic solver that provides transport solution to heterogeneous reactor core problems
A total of eight unique coarse meshes were used by COMET to model the 2D Small Modular Advanced HighTemperature Reactor (SmAHTR) benchmark problems
The recently developed 2D SmAHTR benchmark problems were used to test the performance of the COMET method
Summary
The coarse mesh transport code COMET [1,2,3] is a hybrid stochastic-deterministic solver that provides transport solution to heterogeneous reactor core problems. COMET is well-suited to model advanced reactors since material heterogeneities down to the fuel and burnable absorber particle levels are fully modeled in COMET response function generation. A set of stylized Small Modular Advanced HighTemperature Reactor (SmAHTR) problems [6] was used to evaluate the performance of COMET by comparing its results with the corresponding continuous-energy Monte Carlo solutions. These benchmark problems are ideal to evaluate the COMET performance because of their unique neutronics characteristics. `such as strong leakage due to the small size of the modular design and high heterogeneity resulting from the use of TRISO fuel particles as well as burnable absorber particles.
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