Development of a MC/MOC two-step method for sodium fast reactor analysis with transport-corrected flux-moment multigroup cross-section generation method
Yiwei Wu , Qufei Song , Yuyang Shen , Hui Guo , Yao Xiao , Hanyang Gu
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引用次数: 0
Abstract
New fast reactor designs could feature complex geometries and axial heterogeneity. The MC/MOC two-step method has the advantage of the high adaptability of Monte Carlo (MC) and Method of Characteristics (MOC) to geometry, offering a precise solution for such reactors. However, limited studies exist on applying the MOC method to 3D sodium fast reactors. MC-generated multi-group cross-sections, which ignore the anisotropy with respect to neutron direction, introduce bias in transport calculations. This paper develops a two-step MC/MOC approach, integrating the direct 3D MOC method and the Transport-corrected flux-moment homogenization technique (TC-MHT) for 3D reactor problems. The scheme is verified on the sodium-cooled fast reactor MET-1000, the results confirm the feasibility of the method for both homogeneous and heterogeneous core geometries. The TC-MHT method significantly reduces calculation bias, with eigenvalue bias below 200 pcm, heterogeneous pin power bias under 3.1%, and homogeneous assembly power bias under 1.4%.
期刊介绍:
Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.