Development and Preliminary Verification of a Two-Step Monte Carlo-Diffusion Depletion Scheme for Sodium-Cooled Fast Reactors
PNUCENE-D-24-01109
- 19Usage
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
Citation Benchmarking is provided by Scopus and SciVal and is different from the metrics context provided by PlumX Metrics.
Paper Description
Sodium-cooled fast reactors (SFRs) have a hard neutron spectrum and complex resonance interference phenomena, making traditional computational methods for pressurized water reactors (PWRs) unsuitable. In this work, a Monte Carlo (MC)-Diffusion depletion scheme specifically developed for SFRs is proposed. This scheme follows a two-step calculation process: generating homogenized macroscopic cross sections (XSs) using the MC method, followed by three-dimensional core calculations with a nodal diffusion solver. To enhance the accuracy of control rod worth calculations, Super-Homogenization (SPH) corrections are utilized. Additionally, an independent depletion solver module is integrated to achieve core burnup calculations. This scheme is validated against the OECD/NEA benchmark for a 1000 MWth metal-fueled sodium-cooled reactor. Validation results show accurate predictions for key parameters, including core keff (-104 pcm deviation), Doppler constant (-37.6 pcm), sodium void worth (246.1 pcm), control rod worth (-12.3 pcm), and power distribution (maximum relative deviation of 1.00% radially and 4.63% axially). Actinide concentration deviations were mostly within 1%, while some specific isotopes reached up to 4%. The two-step MC-diffusion depletion scheme significantly improves computational efficiency compared to direct MC simulations, reducing CPU hours from 7464.4 to 781.24 and demonstrating its potential for fast reactor core design and fuel management. This work also investigates the error cancellation phenomenon in the two-step MC-diffusion scheme.
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