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논문 기본 정보

자료유형
학술저널
저자정보
윤주일 (서울대학교) 이현철 (부산대학교) 주한규 (서울대학교) 김형석 (한전원자력연료)
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제53권 제11호
발행연도
2021.11
수록면
3,543 - 3,562 (20page)
DOI
https://doi.org/10.1016/j.net.2021.05.028

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The methods and performance of a 3D pin-by-pin neutronics code based on the 2D/1D decouplingmethod are presented. The code was newly developed as an effort to achieve enhanced accuracy andhigh calculation performance that are sufficient for the use in practical nuclear design analyses. From the3D diffusion-based finite difference method (FDM) formulation, decoupled planar formulations areestablished by treating pre-determined axial leakage as a source term. The decoupled axial problems areformulated with the radial leakage source term. To accelerate the pin-by-pin calculation, the two-levelcoarse mesh finite difference (CMFD) formulation, which consists of the multigroup node-wise CMFDand the two-group assembly-wise CMFD is implemented. To enhance the accuracy, both the discontinuity factor method and the super-homogenization (SPH) factor method are examined for pin-wisecross-section homogenization. The parallelization is achieved with the OpenMP package. The accuracyand performance of the pin-by-pin calculations are assessed with the VERA and APR1400 benchmarkproblems. It is demonstrated that pin-by-pin 2D/1D alternating calculations within the two-level 3DCMFD framework yield accurate solutions in about 30 s for the typical commercial core problems, on aparallel platform employing 32 threads

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