Advanced two-level CMFD acceleration method for the 3D whole-core high-fidelity neutron adjoint transport calculation

Nuclear Engineering and Technology

Chen Hao¹  Kaijie Zhu²  Yunlin Xu² 

[1] Institute of Nuclear and New Energy Technology(INET), Tsinghua University, Beijing, 100084, China;Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, 150001, China;

关键词: Adjoint;    2D/1D;    CMFD;    Two-level acceleration;   

DOI  :  

来源: DOAJ

【 摘 要 】

In the 2D/1D method, a global adjoint CMFD based on the generalized equivalence theory is built to synthesize the 2D radial MOC adjoint and 1D axial NEM adjoint calculation and also to accelerate the iteration convergence of 3D whole-core adjoint transport calculation. Even more important, an advanced yet accurate two-level (TL) CMFD acceleration technique is proposed, in which an equivalent one-group adjoint CMFD is established to accelerate the multi-group adjoint CMFD and then to accelerate the 3D whole-core adjoint transport calculation efficiently. Based on these method, a new code is developed to perform 3D adjoint neutron flux calculation. Then a set of VERA and C5G7 benchmark problems are chosen to verify the capability of the 3D adjoint calculations and the effectiveness of TL CMFD acceleration. The numerical results demonstrate that acceptable accuracy of 2D/1D adjoint calculations and superior acceleration of TL CMFD are achievable.

【 授权许可】

Unknown