2018 Symposium on Nuclear Data, Nov. 28, 2018 Multi-Purpose Digital Hall & Collaboration Room (Ookayama campus, Tokyo Institute of Technology, Meguro, Tokyo) Development of GENESIS, a general three- dimensional transport code based on the Legendre polynomial Expansion of Angular Flux method Akio Yamamoto *) , Akinori Giho, Tomohiro Endo *) *) Nagoya University 1 Outline Recent trends of advanced core analysis methods Overview of GENESIS LEAF method Geometry treatments Verification results Summary 2
Recent trends of advanced core analysis methods 3 Recent trends (US) (International) Nuclear Energy Research Initiative (NERI, I-NERI) Consortium for Advanced Simulation of Light Water Reactors (CASL) 3D transport calculation in heterogeneous geometry DeCART, MPACT https://www.casl.gov/ 4
Recent trends (ROK) DeCART developed by I-NERI project nTRACER developed by SNU http://neutron.snu.ac.kr/node/7 5 Recent trends (China) Many activities in Xi’an Jiaotong University and related reactor physics group 3D pin-by-pin (cell homogenous) transport code B. Zhang et al., “Heterogeneous Neutron Leakage Model for PWR Pin-by-pin Calculation,” 6 Ann. Nucl. Energy, 110, 443 (2017).
Recent trends (EU) CEA and EdF are developing next generation core analysis code for fast reactors D. Schneider et al., “APOLLO3: CEA/DEN Deterministic Multi-Purpose Code for Reactor Physics Analysis,” 7 Proc. PHYSOR2016 Outline of the GENESIS code 8
Outline of GENESIS Multigroup neutron and photon transport calculations Major target: reactor cores Generalized geometry treatment Deterministic methods 3D LEAF 、 2D MOC Multi-group cross sections are provided by other codes Linkages to SRAC2006, Free-FIDO format are implemented 9 Legendre polynomial Expansion of Angular Flux (LEAF) method 10
LEAF method z z y y x x y z x s 11 LEAF method 12
LEAF method z 𝜔 ���,��� 𝑡 z 𝜔 ���,����� 𝑨 𝜔 ��,���� 𝑨 s s s 𝑟 𝑡, 𝑨 z 𝜔 ��,������ 𝑡 13 Planar MOC vs LEAF Planar MOC MOC for radial direction (2D) Low order calculation (e.g. diffusion, SPn) for axial direction http://neutron.snu.ac.kr/node/7 LEAF No approximation z z y s x 14
Geometry treatment by GENESIS 15 Geometry – overview 3D geometry is expressed as stack of planes Use combinatorial geometry for radial direction https://phys.org/news/2013-07-casl-milestone-validates-reactor-tva.html http://neutron.snu.ac.kr/node/7 16
BWR – 3x3 fuel assemblies BWR – flux regions
BWR – 3x3 fuel assemblies KAIST benchmark problem (Cho et al.)
C5G7 hexagonal benchmark (Joo et al.) PWR – 4 loop type, full core with baffle reflector
Seed – blanket fuel CANDU
Large FBR 25 FBR fuel assembly with wrapper tube 26
Verification calculations 27 C5G7 3D benchmark problem Rodded A, Rodded B Rodded B 28
C5G7 3D benchmark problem RMS error of pin-by-pin fission rate (Rodded-B) 0.70 0.64 0.60 RMS difference (%) 0.50 0.40 0.34 0.30 0.25 0.20 0.13 0.10 0.00 Genesis Chaplet-3D CRX MCCG3D 29 C5G7 3D void benchmark problem Void-A Void-B 30
Recommend
More recommend
