High-Order Homogenization Method in Diffusion Theory for Reactor Core Simulation and Design Calculation

Rahnema, Farzad

Georgia Tech Research Corporation (United States)

关键词: Homogenization Methods;    Diffusion;    Cross Sections;    Simulation;    Boundary Conditions;   

DOI  :  10.2172/816337
RP-ID  :  DOE/ID/13960
RP-ID  :  FG07-00ID13960
RP-ID  :  816337

美国|英语

来源: UNT Digital Library

【 摘 要 】

Most modern nodal methods in use by the reactor vendors and utilities are based on the generalized equivalence theory (GET) that uses homogenized cross sections and flux discontinuity factors. These homogenized parameters, referred to as infinite medium parameters, are precomputed by performing single bundle fine-mesh calculations with zero current boundary conditions. It is known that for configurations in which the node-to-node leakage (e.g., surface current-to-flux ratio) is large the use of the infinite medium parameters could lead to large errors in the nodal solution. This would be the case for highly heterogeneous core configurations, typical of modern reactor core designs.